Top 10 Blockchain Developer Interview Questions

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What are the key responsibilities of a blockchain developer?

Purpose: To understand the candidate’s awareness of their role and responsibilities.

Sample answer: Blockchain developers design, implement, and maintain decentralized blockchain applications. They write and test smart contracts, ensure the security and integrity of blockchain networks, and collaborate with other developers to integrate blockchain solutions into existing systems.

Why it works: This answer highlights the candidate’s comprehensive understanding of their role and ability to collaborate effectively.

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Describe your experience with different blockchain platforms.

Purpose: To gauge the candidate’s proficiency with various blockchain technologies.

Sample answer: I have experience working with Ethereum, Hyperledger, and Binance Smart Chain. On Ethereum, I have developed several smart contracts using Solidity. With Hyperledger, I have built private blockchain solutions for enterprise use, focusing on data privacy and permissioned networks.

Why it works: This answer demonstrates practical experience with multiple blockchain platforms, indicating the candidate’s versatility and depth of knowledge.

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How do you approach securing a blockchain application?

Purpose: To assess the candidate’s understanding of blockchain security and best practices.

Sample answer: I prioritize security by conducting thorough code reviews and using automated tools to identify vulnerabilities. I also implement multi-signature wallets, follow secure coding standards, and regularly update libraries and dependencies to protect against known exploits.

Why it works: This answer shows a proactive and comprehensive approach to ensuring the security of blockchain applications.

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What is your experience with smart contract development?

Purpose: To determine the candidate’s familiarity with creating and deploying smart contracts.

Sample answer: I have developed and deployed smart contracts primarily on the Ethereum platform using Solidity. I’ve created contracts for various use cases, including token issuance, decentralized finance (DeFi) applications, and voting systems. I thoroughly test my contracts using frameworks like Truffle and Hardhat.

Why it works: This answer indicates the candidate’s hands-on experience with smart contract development and a strong focus on testing.

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How do you ensure compliance with regulatory requirements in blockchain projects?

Purpose: To understand the candidate’s knowledge and application of legal and regulatory standards.

Sample answer: I ensure compliance by staying informed about the latest regulations affecting blockchain technology, such as GDPR and AML/KYC requirements. I incorporate these standards into the design and implementation of blockchain solutions, working closely with legal experts when necessary.

Why it works: This answer demonstrates a proactive approach to regulatory compliance, which is crucial for maintaining the legality and integrity of blockchain projects.

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Describe a challenging blockchain project you worked on and how you managed it.

Purpose: To evaluate the candidate’s experience and ability to handle complex projects.

Sample answer: I worked on a project to develop a decentralized voting platform. The challenge was to ensure the integrity and anonymity of votes while maintaining a transparent and tamper proof system. I led a team to design a robust cryptographic protocol and integrated secure multi-party computation to achieve our goals.

Why it works: This answer showcases the candidate’s leadership, problem-solving, and technical skills.

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How do you stay current with advancements in blockchain technology?

Purpose: To assess the candidate’s commitment to continuous learning and professional development.

Sample answer: I stay current by participating in blockchain conferences, joining online communities like GitHub and Stack Exchange, and following thought leaders on platforms like X and LinkedIn. I also regularly read research papers and contribute to open-source blockchain projects.

Why it works: This answer highlights the candidate’s dedication to staying informed about blockchain industry trends and advancements.

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What methods do you use for testing blockchain applications?

Purpose: To determine the candidate’s expertise in testing and quality assurance.

Sample answer: I use a combination of unit testing, integration testing, and end-to-end testing for blockchain applications. Tools like Truffle and Hardhat help automate these tests. Additionally, I conduct testnet deployments to simulate real-world scenarios and perform thorough security audits.

Why it works: This answer indicates a thorough and practical approach to ensuring application reliability and security.

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How do you handle design changes or unexpected issues during a blockchain project?

Purpose: To evaluate the candidate’s flexibility and problem-solving skills in dynamic situations.

Sample answer: I handle design changes by assessing their impact on the project’s timeline and objectives. I communicate with the team and stakeholders to develop a revised plan and ensure that changes are well-documented. Continuous integration and regular code reviews help me adapt effectively to unexpected issues.

Why it works: This answer demonstrates adaptability and effective communication, essential for managing project changes smoothly.

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What experience do you have with blockchain consensus algorithms?

Purpose: To understand the candidate’s knowledge of consensus mechanisms and their practical application.

Sample answer: I have experience with various consensus algorithms, including Proof of Work (PoW), Proof of Stake (PoS), and Practical Byzantine Fault Tolerance (PBFT). I have implemented PoS in staking platforms and utilized PBFT in private blockchain networks to achieve consensus efficiently.

Why it works: This answer shows the candidate’s understanding of different consensus algorithms and their ability to apply them to various blockchain projects.

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$45 hourly
Abed A.
- 4.8
- (42 jobs)
Breda, NB
Blockchain
Ionic Framework
Smart Contract
Angular 2
Ethereum
Amazon MWS
API Development
SaaS
Vue.js
Angular
PHP
Laravel
JavaScript
React

Overview I’m Abed — Senior Full-Stack & AI Engineer (15+ years). I build and scale production-grade SaaS, marketplaces, and AI-powered e-commerce with clean architecture, measurable KPIs, and reliable delivery. What I deliver: 🛒 Multichannel commerce & ops: Amazon SP-API, Shopify, eBay, bol.com; listings/sync, orders/stock, pricing & rule engines, ERP/WMS/logistics/accounting integrations. 🤖 AI/LLM features: Product content from images, attribute mapping, RAG assistants, and cost-controlled AI microservices (OpenAI + self-hosted). 💳 FinTech & payments: KYC-ready APIs, reconciliation dashboards, audit trails, secure transaction flows. 🪙 Web3: NFT marketplaces & token utilities on Ethereum/Solana, wallet flows, IPFS pipelines. 🚀 SaaS/MVPs: Rapid PoCs → scalable releases with CI/CD, observability, documentation. Why hire me: 🧭 I own the architecture through launch and integrate the messy bits (legacy systems, 3rd-party APIs, data sync). 📈 Proven impact: SellEnvo (300+ customers), Mymesh (1,000+ buildings), B2BPay (3,000+ companies). 🗣️ Clear comms: short discovery → scoped milestones → weekly demos → on-time delivery. Selected projects 🛍️ SellEnvo — Co-Founder & Lead Architect. AI-powered multichannel SaaS; plug-and-play integrations; AI microservice shared with Listapro. (Laravel, Vue, AWS) — sellenvo.com 🧠 Listapro.ai — AI & Backend Dev. .NET Core backend for OpenAI + hosted LLMs; Shopify integration; Azure CI/CD. — listapro.ai 🏢 Mymesh — Senior Full-Stack. Smart-building dashboard + IoT sensors/control; microservices; SignalR realtime. — mymesh.nl 🗓️ Planbition — Team Lead. REST APIs, Ionic mobile app, worker planner, ML auto-planning, timesheets. — planbition.nl 💱 B2BPay — Backend & Integrations. FX/global payments APIs; OpenBank API; dashboards; DigitalOcean. — b2bpay.co 🌾 InventoryClub — Lead Blockchain. VNT token + smart contracts; trading wallet/app; MultiChain network. — inventoryclub.com 🪙 Sandwich.Network (Solana) — Full-Stack & Blockchain. Create/hold/trade NFTs; JS smart-contract integration. — sandwich.network ⭐ MyDC (Stellar) — Full-Stack & Payments. Wallet (buy/sell MYDC), payment gateway APIs, KYC/admin dashboard. — mydc.com.my 🎧 MIXO (Electron) — Cross-platform music library manager for DJs; audio library integrations. — mixo.dj 🎻 ProjectSAM Downloader (Electron + Vue) — Buy/download/manage orchestral libraries; payments; search. — projectsam.com 🚢 SoftSHIP (Ionic + Angular) — Shipping ops mobile app + web dashboard. — softship.com 🔐 Semieta (C#/.NET + Angular) — Visitor management & access control with door-lock/sensor integrations. — semieta.com 👨‍👩‍👧‍👦 IntelliPresence — Family privacy platform: IoT device link, telehealth appts, med reminders, video calls. — intellipresence.com 🥑 Avokado (Ionic + Laravel) — Marketplace, catalog, cart/checkout, order tracking, logistics integration. — avocadodelivers.app How I work 🧩 Architecture first (scalable, testable, documented) 📅 Weekly demos & transparent async comms 🔒 Security & privacy by design; your code/IP stays yours 👥 Solo or I can assemble a small senior team for extra velocity Skills: C#, .NET Core, .NET Framework, Delphi, PHP, Laravel, CodeIgniter, Node.js (ExpressJS, HAPI), JavaScript, Vue.js, Angular, React.js, HTML, CSS, TypeScript, Ionic, MySQL, SQL Server, PostgreSQL, MongoDB, ORM frameworks, Amazon SP API, Shopify, eBay, bol.com, crypto APIs, OpenAI APIs, e-commerce, banking, fintech, blockchain, crypto, NFT marketplaces, IoT, booking platforms, payment processing, ERP, CRM, scheduling systems, AI, LLM integration, LLaMA, OpenAI, AI-powered content generation, SEO optimization, automation, low-code (Mendix), cloud-native architecture, microservices, event-driven design, AWS, Azure, Docker, CI/CD pipelines, scalable architectures, performance optimization, and advanced UI/UX solutions.
$100 hourly
Suat K.
- 4.6
- (11 jobs)
Istanbul, ISTANBUL
Blockchain
Solidity
web3.js
.NET Core
Generative AI
Ionic Framework
React Native
Salesforce
Swift
AI Development
React
PHP
Vue.js
TypeScript
JavaScript
Node.js
Kotlin
Angular

🏆 Expert-Vetted 🎯%100 Job Succession ⚙️10+ years of extensive experience in all phases of the software development life cycle with unlimited coding skills. Excellent interpersonal skills and a specialty in translating technical concepts to non-technical clients. A strong ability to work independently and proactively, finishing projects on time and within budget. 🧠A great problem solver I have experience in the following technologies : ✅Angular ✅React ✅Vue ✅Node.js ✅Parse Server (Open Source Contributor) ✅PHP ✅Swift ✅Kotlin ✅Ionic ✅React Native ✅Solidity ✅Candy Machine (Metaplex-Solana) I am always seeking long-lasting relationships, if you do also let's work together! 🤝🏻
$36 hourly
Tadas V.
- 5.0
- (7 jobs)
Vilnius, VILNIUS
Blockchain
Smart Contract
EOS
C++
C
React
JavaScript
Node.js
Python

A game developer, currently mostly working on blockchain applications, not related to games anymore. Have experience developing web / mobile applications and smart contracts in wide range languages and technologies like C, C++, Python, NodeJS, C#, Java, ReactJS. Blockchain experience include research done in the university and on my own and developing blockchain applications as a freelancer. EOSIO is the platform I'm most familiar with. Was following it's development since inception and contributed some code to the EOSIO core repository. Developed a lot of smart contracts on it as well as full dApps from backend and smart contracts with unit tests to the frontend. While, it's just so happens that most of my work on EOSIO at the moment, my previous experience with cross platform game development and skill set acquired in other projects throughout the years allows me to work on other types of jobs as well.

$45 hourly
Abed A.
- 4.8
- (42 jobs)
Breda, NB
Blockchain
Ionic Framework
Smart Contract
Angular 2
Ethereum
Amazon MWS
API Development
SaaS
Vue.js
Angular
PHP
Laravel
JavaScript
React

Overview I’m Abed — Senior Full-Stack & AI Engineer (15+ years). I build and scale production-grade SaaS, marketplaces, and AI-powered e-commerce with clean architecture, measurable KPIs, and reliable delivery. What I deliver: 🛒 Multichannel commerce & ops: Amazon SP-API, Shopify, eBay, bol.com; listings/sync, orders/stock, pricing & rule engines, ERP/WMS/logistics/accounting integrations. 🤖 AI/LLM features: Product content from images, attribute mapping, RAG assistants, and cost-controlled AI microservices (OpenAI + self-hosted). 💳 FinTech & payments: KYC-ready APIs, reconciliation dashboards, audit trails, secure transaction flows. 🪙 Web3: NFT marketplaces & token utilities on Ethereum/Solana, wallet flows, IPFS pipelines. 🚀 SaaS/MVPs: Rapid PoCs → scalable releases with CI/CD, observability, documentation. Why hire me: 🧭 I own the architecture through launch and integrate the messy bits (legacy systems, 3rd-party APIs, data sync). 📈 Proven impact: SellEnvo (300+ customers), Mymesh (1,000+ buildings), B2BPay (3,000+ companies). 🗣️ Clear comms: short discovery → scoped milestones → weekly demos → on-time delivery. Selected projects 🛍️ SellEnvo — Co-Founder & Lead Architect. AI-powered multichannel SaaS; plug-and-play integrations; AI microservice shared with Listapro. (Laravel, Vue, AWS) — sellenvo.com 🧠 Listapro.ai — AI & Backend Dev. .NET Core backend for OpenAI + hosted LLMs; Shopify integration; Azure CI/CD. — listapro.ai 🏢 Mymesh — Senior Full-Stack. Smart-building dashboard + IoT sensors/control; microservices; SignalR realtime. — mymesh.nl 🗓️ Planbition — Team Lead. REST APIs, Ionic mobile app, worker planner, ML auto-planning, timesheets. — planbition.nl 💱 B2BPay — Backend & Integrations. FX/global payments APIs; OpenBank API; dashboards; DigitalOcean. — b2bpay.co 🌾 InventoryClub — Lead Blockchain. VNT token + smart contracts; trading wallet/app; MultiChain network. — inventoryclub.com 🪙 Sandwich.Network (Solana) — Full-Stack & Blockchain. Create/hold/trade NFTs; JS smart-contract integration. — sandwich.network ⭐ MyDC (Stellar) — Full-Stack & Payments. Wallet (buy/sell MYDC), payment gateway APIs, KYC/admin dashboard. — mydc.com.my 🎧 MIXO (Electron) — Cross-platform music library manager for DJs; audio library integrations. — mixo.dj 🎻 ProjectSAM Downloader (Electron + Vue) — Buy/download/manage orchestral libraries; payments; search. — projectsam.com 🚢 SoftSHIP (Ionic + Angular) — Shipping ops mobile app + web dashboard. — softship.com 🔐 Semieta (C#/.NET + Angular) — Visitor management & access control with door-lock/sensor integrations. — semieta.com 👨‍👩‍👧‍👦 IntelliPresence — Family privacy platform: IoT device link, telehealth appts, med reminders, video calls. — intellipresence.com 🥑 Avokado (Ionic + Laravel) — Marketplace, catalog, cart/checkout, order tracking, logistics integration. — avocadodelivers.app How I work 🧩 Architecture first (scalable, testable, documented) 📅 Weekly demos & transparent async comms 🔒 Security & privacy by design; your code/IP stays yours 👥 Solo or I can assemble a small senior team for extra velocity Skills: C#, .NET Core, .NET Framework, Delphi, PHP, Laravel, CodeIgniter, Node.js (ExpressJS, HAPI), JavaScript, Vue.js, Angular, React.js, HTML, CSS, TypeScript, Ionic, MySQL, SQL Server, PostgreSQL, MongoDB, ORM frameworks, Amazon SP API, Shopify, eBay, bol.com, crypto APIs, OpenAI APIs, e-commerce, banking, fintech, blockchain, crypto, NFT marketplaces, IoT, booking platforms, payment processing, ERP, CRM, scheduling systems, AI, LLM integration, LLaMA, OpenAI, AI-powered content generation, SEO optimization, automation, low-code (Mendix), cloud-native architecture, microservices, event-driven design, AWS, Azure, Docker, CI/CD pipelines, scalable architectures, performance optimization, and advanced UI/UX solutions.
$100 hourly
Suat K.
- 4.6
- (11 jobs)
Istanbul, ISTANBUL
Blockchain
Solidity
web3.js
.NET Core
Generative AI
Ionic Framework
React Native
Salesforce
Swift
AI Development
React
PHP
Vue.js
TypeScript
JavaScript
Node.js
Kotlin
Angular

🏆 Expert-Vetted 🎯%100 Job Succession ⚙️10+ years of extensive experience in all phases of the software development life cycle with unlimited coding skills. Excellent interpersonal skills and a specialty in translating technical concepts to non-technical clients. A strong ability to work independently and proactively, finishing projects on time and within budget. 🧠A great problem solver I have experience in the following technologies : ✅Angular ✅React ✅Vue ✅Node.js ✅Parse Server (Open Source Contributor) ✅PHP ✅Swift ✅Kotlin ✅Ionic ✅React Native ✅Solidity ✅Candy Machine (Metaplex-Solana) I am always seeking long-lasting relationships, if you do also let's work together! 🤝🏻
$36 hourly
Tadas V.
- 5.0
- (7 jobs)
Vilnius, VILNIUS
Blockchain
Smart Contract
EOS
C++
C
React
JavaScript
Node.js
Python

A game developer, currently mostly working on blockchain applications, not related to games anymore. Have experience developing web / mobile applications and smart contracts in wide range languages and technologies like C, C++, Python, NodeJS, C#, Java, ReactJS. Blockchain experience include research done in the university and on my own and developing blockchain applications as a freelancer. EOSIO is the platform I'm most familiar with. Was following it's development since inception and contributed some code to the EOSIO core repository. Developed a lot of smart contracts on it as well as full dApps from backend and smart contracts with unit tests to the frontend. While, it's just so happens that most of my work on EOSIO at the moment, my previous experience with cross platform game development and skill set acquired in other projects throughout the years allows me to work on other types of jobs as well.
$50 hourly
Syed Muhammad W.
- 4.7
- (45 jobs)
Mardan, KP
Blockchain
DApps
Bitcoin
Ethereum
Blockchain Development
Solidity
JavaScript
Binance Coin
React
Node.js
Smart Contract

As a blockchain consultant, I provide expert advice and guidance on the implementation of blockchain technology for your business needs. I specialize in designing and implementing blockchain solutions to enhance security, transparency, and efficiency. Additionally, I can help you navigate legal and regulatory compliance, and advise on the best blockchain platforms and tools for your specific needs. Partner with me to stay ahead of the curve in this rapidly evolving field and take advantage of the many benefits of blockchain technology. Tools & skills: Blockchain Development, Solidity, RUST, Web3, node-js, EVM, React, & Many more..
$60 hourly
Joao F.
- 5.0
- (20 jobs)
Tomar, SANTARÉM
Blockchain
Content Marketing Strategy
Creative Writing
Content Creation
Blog Writing
Blog Content
Writing
Copywriting
Digital Marketing
Sports Writing
Cryptocurrency
SEO Keyword Research
Search Engine Optimization
SEO Writing
On-Page SEO

Hello! 🤚 I am João and I am a Content Marketing Specialist with proven professional expertise in several areas of marketing. From small to big enterprises, during the past 5 years, I helped a number of companies to define a unique value proposition of their brands, target markets and develop strategies to connect with clients through optimised and engaging content. 🤝 My professional experience is based on a solid educational background. I have a Bachelor's Degree in Management and a Master's Degree in Management with a Specialisation in Strategic Marketing from two of the best Business Schools in Europe 📖 I can help you with: - Content Creation 🔠 - Copywriting ✒️ - Search Engine Optimization 🔎 - Social Media Marketing 📱 - Branding ™️ - Remote Work Transition 👨‍💻 Your project will become my number 1️⃣ priority until you are fully satisfied and you achieve your goals 🎯 Feel free to contact me and clear your doubts! Let's reach the top together! 🏅 Joao
$35 hourly
Bazil K.
- 4.9
- (76 jobs)
Nairobi, NAIROBI AREA
Blockchain
Cryptocurrency
Investment Strategy
Content Writing
Ethereum
Binance Coin
Article Writing
Blockchain, NFT & Cryptocurrency
Technical Writing
Blog Content
Blog Writing
Writing
Bitcoin

"Fast turnaround and quality work. Also, open to feedback and new ways to collaborate. I would recommend working with 10/10~!" "Awesome work and easy to communicate and plan with. Would recommend to anyone looking for a high-quality content writer (my projects were crypto, so anyone looking there take this as a positive rec)" I am a skilled content writer/editor with a strong interest in technology, particularly Fintech. My areas of expertise include cryptocurrencies, blockchain, and Web3. With more than five years of experience, I have written extensively about disruptive technologies. My work has been featured on reputable crypto and blockchain websites such as usethebitcoin.com, European Blockchain Convention, NFT Plazas, coinjournal.net, coinlist.me, NFT News Today, and many others. Moreover, I possess advanced knowledge in SEO and can assist in optimizing your content for better visibility on Google. If you require assistance with: -Creating blog/website articles, news pieces, how-to guides, feature articles, project reviews, and press releases -Research on various projects/topics and current trends within the industry -Technical documentation like Whitepapers, Litepapers, e-books, and coin technical analysis - And any other crypto-related work Please don't hesitate to reach out! That said, for the finest Web3-related content services, feel free to Hire Me Now!!!
$50 hourly
Piyush G.
- 4.8
- (53 jobs)
New Delhi, DELHI
Blockchain
KuCoin Shares
API
Automation
Blockchain Development
Node.js
Python
Cryptography
Binance Coin
Cryptocurrency
Smart Contract
Solidity

I am a blockchain smart contract Developer & Consultant, writing smart contracts, creating cryptocurrencies, NFTs, and launching ICOs, with 5 years of experience with solidity and smart contract development in the ethereum blockchain ecosystem. My expertise: - Determining the viability of a blockchain based solution for your business needs - Write smart contract logic code for anything you can think of. - Decentralized cryptocurrency exchange (DEX) - Front Running / Back-running Bots - DEX based trading bots for cryptocurrency - Binance smart chain development - Smart contract Audit - NFT, IPFS, ERC721, ERC1155 development - Token & Coin development - Staking, yield farming, lottery, prediction smart contracts
$130 hourly
Wilson N.
- 4.6
- (42 jobs)
Geneve, GE
Blockchain
International Law
Trade Law
FinTech Consulting
Intellectual Property Law
Regulatory Compliance
Legal Consulting
GDPR
Arbitration
Data Privacy
Corporate Law
Contract Law
Contract Drafting

I’m a Swiss-based banking, compliance, and commodities professional with over five years of experience in Private and Commercial Banking at a leading global financial institution, combined with hands-on legal and operational experience in the oil, gas, and commodities trading sector. I help businesses, trading houses, financial intermediaries, and private clients navigate the most demanding parts of banking and commodities — KYC, onboarding, AML compliance, credit coordination, trade finance, and trust structuring — with the rigor expected at tier-1 global banks and trading firms. What I do: • KYC & Client Onboarding — End-to-end coordination of corporate, commodities, and private client onboarding, including complex multi-jurisdictional structures, PEP screening, source-of-wealth and source-of-funds analysis, and regulatory file remediation. • AML & Compliance Advisory — Drafting and reviewing compliance documentation, escalation memos, sanctions checks (including OFAC, EU, and Swiss regimes), and internal control frameworks aligned with FINMA, EU, and international standards. Strong exposure to commodities-related compliance risks including counterparty due diligence and embargo screening. • Commodities, Oil & Gas Advisory — Contract drafting and review for the supply, purchase, and trading of energy products (crude oil, refined products, LNG, metals, and soft commodities). Familiarity with trade finance instruments (LCs, SBLCs, prepayment structures), Incoterms, and cross-border supply chain considerations, particularly across Africa, the Middle East, and emerging markets. • Trust & Wealth Structuring — STEP-certified in International Trust Management. I advise on trust formation, fiduciary obligations, and cross-border wealth structures for HNW and UHNW clients, including those with commodities and trading interests. • Credit & Financial Analysis — Preparation of credit reviews, financial statement analysis, and risk assessments for mid-market, corporate, and commodities clients (currently completing CFI’s Finance & Capital Markets certification). • Legal & Contract Support — Contract drafting and review, regulatory research, and legal opinions, building on my LL.M. in International Contracts and Arbitration (University of Fribourg) and prior experience in international arbitration at a top-tier Swiss law firm and in legal/operations at a Geneva-based oil and commodities trading house. Industries I’ve supported: banking, asset management, commodities trading, oil and gas, energy, fiduciary services, healthcare, and technology. Languages: English (native), French (professional). I work discreetly, deliver to institutional standards, and turn complex regulatory and commercial requirements into clear, actionable outcomes. Whether you need a one-off KYC file reviewed, a trade finance contract drafted, an onboarding process built from scratch, or ongoing compliance and commodities advisory, I bring the perspective of someone who operates at the intersection of global banking, law, and commodities every day. Let’s discuss your project.
$35 hourly
Yassine Z.
- 5.0
- (6 jobs)
Tirana, TIRANE
Blockchain
AI Development
Python
FinTech
Software Development
Back-End Development
Spring Framework
Java
Testing
MongoDB
DevOps
Hibernate
Microservice
SQL

Hi there! I’m a hard-working, results-oriented software engineer with deep experience in complex, high-impact systems. I thrive in environments that require sharp problem-solving, structured thinking, and relentless commitment to quality. With a Master’s degree in Artificial Intelligence, I bring over a decade of programming experience — starting in 2013 — and have worked across domains including healthcare, blockchain, telecommunications, insurance, social media, and data analytics. I prioritize clarity of purpose (the WHY) before implementation (the HOW) and always aim for solutions that are sustainable, measurable, and scalable. ⸻ 🧩 Key Strengths • 🔹 Strong communication, leadership, and cross-team collaboration • 🔹 Solid theoretical background in AI, math, and computer science • 🔹 Adaptable to evolving tech stacks, project types, and industries • 🔹 Results-driven mindset with a passion for clean architecture and scalable code ⸻ 🧠 Core Skills & Technologies 💻 Backend Engineering • Java 17 · Spring Boot · Spring Framework · Spring Security · Spring MVC · Spring Data JPA • Quarkus · Hibernate · RESTful APIs · JWT · JUnit · Cucumber · Reactive Programming, AML, python for AI 💻 Frontend Engineering • Vaadin UI - Swing - JavaFx - Angular 🤖 AI Integration & Engineering • Daily use of AI tools such as Claude Code for development acceleration • Reviewing, validating, and refining AI-generated outputs for quality and correctness • Context engineering to design effective prompts and structured AI interactions • Leveraging AI to improve productivity, architecture decisions, and problem-solving ☁️ Cloud & DevOps • AWS (SES, SNS, S3, EC2, ELB, Lambda, Cognito, KMS, RDS, CloudWatch, Route53, IAM, API Gateway, CloudHSM, Rekognition, Secrets Manager, VPC) • CI/CD: Jenkins · GitHub Actions · GitLab CI · SonarQube · Maven · Gradle • Infrastructure as Code: Terraform (learning) · CloudFormation (basic) • Containers & Orchestration: Docker · Kubernetes (basic) · ECS · EKS • Monitoring & Logs: CloudWatch · ELK · Prometheus (basic) • Secrets & Vaults: AWS Secrets Manager · KMS 🧪 Testing & Quality • TDD · JUnit · Cucumber · SonarQube · Postman · RestAssured 🧵 Architecture & System Design • Microservices · Event-driven architecture · DDD · REST APIs · Redis · Kafka · RabbitMQ · Spring Cloud (Zuul, Ribbon, Eureka) · Apache Avro · Edge services 🗃️ Databases • SQL (MySQL, PostgreSQL) · NoSQL (MongoDB, Redis) ⸻ 🚀 Professional Experience Worked as a backend/DevOps engineer on multiple domains: 1- integrate SEPA/online banking, build high load env for OLTP system with onchain/offchain transactions, ticket evaluation, bug fixes, change requests from the business team, collaborate with FE/Management team for better architecture solutions, fix high load and improve performance, handling complex transactions with hyper ledger fabric framework for update and new contracts on blockchain, trading systems, KYC/KYB/AML, full OLTP development. 2- Healthcare: High-security systems for hospitals and health insurance 3- Blockchain: Smart contract integrations and secure off-chain/on-chain logic 4- Social Media: Scalable REST APIs and backend systems 5- Telecom & MIS: Real-time, message-driven systems with Kafka and microservices 6- Analytics: Aggregation and insight delivery pipelines ⸻ 🤝 Soft Skills • Strong team player & listener • Self-motivated and driven • Deep focus when working in complex systems • Open to learning and feedback • Passionate about continuous improvement and delivery
$80 hourly
Shahzain T.
- 5.0
- (20 jobs)
Karachi West, SINDH
Blockchain
DApps
JavaScript
Ethereum
Blockchain Development
Smart Contract
web3.js
Solidity

Hey, I’m a certified blockchain dev (BTA) who’s been building smart contracts, Web3 apps, and automation tools on Ethereum and Solana for the past few years. I’ve worked on everything from utility tokens and NFT platforms to automating real-time alerts and building systems that connect on-chain logic with off-chain services. A few projects I’ve built have gone live, sold out fast, and are still running strong. Here’s what I usually work on: Smart contract development (Solidity, anchor) Full-stack dApps (React, Firebase, Firestore, web3.js, etc.) Web3 integrations (wallets, transactions, token gating) Solana tools and automation (wallet listeners, volume trackers, basic bot logic) Telegram integrations for updates/alerts I like working on creative ideas, especially if you're building something fresh in the Web3 space. Whether you’re planning a launch, building a utility around your token, or need backend logic tied to on-chain activity—I can help make it happen. Let’s build something solid.
$85 hourly
Hassan S.
- 5.0
- (16 jobs)
Lahore, PUNJAB
Blockchain
Web Development
Web Application
Vue.js
WebRTC
Quasar Framework
A/B Testing
IT Consultation
User Experience Design
Laravel
User Interface Design
Microsoft PowerPoint
Presentation Design

I help founders clearly communicate their story to investors, customers, and strategic partners — without cluttered slides or a broken narrative. My work focuses on clarity, positioning, and persuasion, not just making presentations look good. Whether you’re preparing for fundraising, an accelerator program, or a high-stakes pitch, I help ensure your message is understood quickly and taken seriously. I’ve worked with early-stage and growing startups to refine pitch decks for seed and Series A fundraising, sales presentations, and investor meetings — often under tight timelines. Who I Work With I work best with: ▣ Tech and SaaS founders ▣ Early-stage startups preparing for Seed or Series A ▣ Teams with traction who need a clearer, stronger story ▣ Founders preparing for demo days, accelerators, or investor meetings If you have a product but struggle to explain why it matters in a few slides, I can help. My Approach I start by understanding who you’re pitching to and what decision you want them to make. From there, I focus on: ▣ Clear problem → solution → value flow ▣ Strong positioning and differentiation ▣ Market opportunity without unnecessary hype ▣ Traction, metrics, and credibility signals ▣ A narrative that matches your audience It’s not just design — it’s structured storytelling with strategic intent. Technical Perspective My background as a full-stack developer helps me understand complex products deeply and translate them into simple, credible narratives that investors can quickly grasp. This is especially valuable for technical or non-obvious products where clarity builds trust. How I Can Help ▣ I typically help founders with: ▣ Refining existing pitch decks ▣ Creating investor-ready decks from rough content ▣ Improving narrative flow and slide structure ▣ Preparing presentations under tight deadlines If you already have content, I’ll help sharpen it. If you’re starting from scratch, I’ll guide you step by step.
$65 hourly
Meyer Y.
- 5.0
- (3 jobs)
New York, NY
Blockchain
Node.js
WordPress
Solidity
Java
React
Visual Basic for Applications

Solana Blockchain Specialist | Bots • Validators • GRPC • Pump.fun Execution I specialize in building real-time Solana trading infrastructure focused on ultra-low-latency execution. Key Capabilities: - Custom Solana bot creation for token launches - Setup and optimization of Solana validators on bare metal servers - Decoding shreds with Rust to detect Pump.fun launches directly from the validator - Slot0 transaction landing via validator-based execution - GRPC streaming via Yellowstone (validator-connected or RPC-based) - Real-time decoding of Pump.fun buy/sell flows through GRPC Slot 0 Transaction Landing: -Durable Nonce System – enables simultaneous submission to multiple relayers (e.g., Oslot, Blockrazor, Bloxroute, NextBlock, Helius) where only the fastest transaction confirms on-chain -Validator-Proximity Routing – dynamically locates the current validator leader’s region (e.g., NY, Frankfurt, Tokyo) and submits to the geographically closest endpoint for lowest latency -GRPC-based PnL Tracking – continuous real-time subscription to wallet and token streams for live profit/loss computation -Bare-Metal Environment Setup – optimized Linux configuration (sysctl tuning, NVMe storage, CPU pinning) to ensure peak validator and bot performance Solscan API Integration: - Pulling live token and trade data for real-time signals inside bots - Exporting data to CSV, Excel, or JSON for backtesting and analysis - Support for advanced market strategies, including: • Viewing all Pump.fun AMM migrations over the past day, week, or month • Analyzing creator activity across Raydium and Pump.fun • Counting how many tokens a creator has launched • Identifying the creator of any mint • Detecting use of Jito bundles in prior launches
$50 hourly
Irfan O.
- 5.0
- (1 job)
Kempten, RHEINLAND-PFALZ
Blockchain
Ethereum
WordPress
React
JavaScript
Bitcoin
Smart Contract
Cryptocurrency
Ruby on Rails
Golang

Dedicated and professional software developer for 15+ years and have wide knowledge in IT industry. Specialized in Blockchain/Cryptocurrency development, recent 5 years. My skills are following: - Cryptocurrency Exchange Platform(CEX&DEX), Peatio - 0x Protocal, ICO, ERC20-223, ERC721, Solidity, Smart Contract, Web3 - Coin Fork(Bitcoin, Ethereum, Stellar, EOS, IOTA, Cardano, Tron, XRP, NEO, Monero, PIVX) - Cryptocurrency Wallet(Web & Android & iOS & Desktop) - GoLang, Python, Ruby on Rails(ROR), Django, Node - Wordpress, WooCoomerce, Magento - ASP.NET, ASP.NET MVC, C#, C/C++, Java - Laravel, CodeIgniter, Symfony - React, Vue, Angular Will provide best quality work in a timely manner.
$35 hourly
perrice v.
- 5.0
- (12 jobs)
Long Beach, CA
Blockchain
Crypto Asset
NFT Design
NFT Art
Image Editing
Google Ads
Video Advertising
Brand Marketing
Shopify
Autodesk Maya
Adobe Illustrator
Adobe Photoshop
Adobe After Effects

With over 15 years of proficiency in the Adobe Suite since the age of 12, I bring a wealth of experience and expertise to every project. My background in networks and programming, coupled with certifications in Python and proficiency in C++, HTML, Java, and CSS, enables me to tackle diverse technical challenges. I have been freelancing for over a decade, specializing in Photoshop, Illustrator, and comprehensive branding and marketing solutions. As a seasoned photographer for more than 10 years, I excel in visual storytelling and content creation. My extensive experience in ecommerce branding and marketing further enhances my ability to deliver impactful solutions. In the realm of 3D design, I possess advanced skills in Maya, Blender, Fusion 360, Substance Painter, ZBrush, Nomad Sculpt, Meshmixer, Windows 3D, and Luban 3D. From 3D printing to prototyping, I am well-versed in every stage of the design process. With a passion for building custom computers and a commitment to exceeding client expectations, I am dedicated to delivering high-quality work on time and within budget. Whatever your project demands, I am equipped to handle it with professionalism and creativity.
$150 hourly
mohamed e.
- 5.0
- (21 jobs)
Ankara, ANKARA
Blockchain
API
Truffle
DApps
Solidity
NFT Minting
Blockchain Development
Smart Contract
Vue.js
Web Application
HTML5
JavaScript

Certified Blockchain Developer / Solidity smart contract / Dapps / IPFS / Truffle Framework / Javascript /NodeJS / Mongodb / ReactJs /HardHat/Web3.js/Ethers.js
$50 hourly
Melanie K.
- 4.9
- (57 jobs)
Terrace, BC
Blockchain
Content Writing
Copywriting
Creative Writing
Copy Editing
Financial Writing
Economics
English
Article Writing
News Writing
Writing
Tech & IT
Journalism Writing
Cryptocurrency

An accomplished writer specializing in emerging technologies, blockchain, cryptocurrency, AI, cybersecurity, data, SaaS, similar B2B writing, sustainability, ESG, recruitment, e-learning, and career topics with excellent SEO and marketing knowledge. I’m available as an article writer, website content writer, copy editor, and proofreader.
$50 hourly
Olufifun A.
- 5.0
- (33 jobs)
Bloemfontein, FS
Blockchain
Blog Content
Online Writing
Article
Article Writing
Sports & Fitness
Blog Writing
Content Writing
Writing
Cryptocurrency
White Paper Writing
Content Marketing
SEO Writing
Travel & Hospitality

Freelance Content Writer with over 8 Years of Experience SEO content writer who helps Online Casino, iGaming and Cryptocurrency brands increase their reach and engagement through content that ranks. I've worked to craft and execute content strategy for several notable brands including - Goal - CompareCasino; - BestNetEnt Casino; - FanDuel Casino; - And many more. I render these services: - Content Strategy - Content Writing - CMS Management - Backlinking I have also written in other niches like health and wellness, mental health, real estate, finance, and technology. Testimonials: "Can highly recommend Olufifun. I am very satisfied with the casino articles he has written." "A pleasure to work with." "Olufifun is a great writer to work with. There is always thorough research, attention to detail, and writing that can definitely be called engaging for readers. It's a joy to work with him regularly." I write unique, well-researched, educative and entertaining articles and blog posts to meet specific needs. I deliver articles on time, and I am diligent, dedicated, and focused on generating amazing results. To get in touch with me, click the "Invite To Job" button on the top right corner of my profile.
$45 hourly
Gulshan A.
- 5.0
- (41 jobs)
Sahibzada Ajit Singh Nagar, PUNJAB
Blockchain
Blockchain, NFT & Cryptocurrency
Blockchain Tokenization
WordPress Development
PSD to WordPress
WordPress Malware Removal
WordPress Customization
WordPress Optimization
WordPress e-Commerce
WordPress Bug Fix
WordPress Plugin
WordPress Consultation
WordPress Security
WordPress Migration
PHP
CodeIgniter
Shopify
Laravel
WooCommerce
WordPress

Businesses waste hours on manual processes that WordPress can automate. I build the systems that fix that. With 14+ years of WordPress expertise and $100K+ earned on Upwork, I specialize in turning complex requirements into clean, scalable solutions, custom plugins, AI integrations, API connections, CRM systems, and full WooCommerce builds. What I deliver: ✔ Custom plugin and functionality development ✔ AI and third-party API integrations ✔ WooCommerce builds and troubleshooting ✔ Performance optimization and speed tuning ✔ Malware removal, security hardening, and emergency fixes Whether you need a complex automation built from scratch or a critical issue resolved fast — I deliver clean, secure, and scalable solutions with clear communication throughout. I don't just build websites — I build automation systems that save time, reduce errors, and scale with your business. Top Rated on Upwork | 100% Job Success | 40+ Projects Completed Ready to discuss what you're building? Let's talk. ===================== KEYWORDS & EXPERTISE WordPress Development | WooCommerce Development | Custom WordPress Plugin Development | WordPress Customization | Elementor Expert | WordPress Migration | WordPress Security | WordPress Performance Optimization | WordPress Bug Fixes | WooCommerce Marketplace | Dokan Multi-Vendor | Membership Websites | Booking Systems Shopify Development | Shopify Plus | Shopify Theme Customization | Shopify Store Setup | Shopify Apps | Shopify SEO | Liquid Development | Shopify Migration | Shopify Store Optimization PHP Development | Laravel Development | Custom Web Applications | REST API Development | API Integration | CRM Development | ERP Development | SaaS Development | MySQL | JavaScript AI Automation | OpenAI API | ChatGPT Integration | Claude AI | AI Chatbot Development | AI Agent Development | AI Workflow Automation | AI-Powered Lead Generation | Generative AI | Prompt Engineering | Cursor AI Technical SEO | On-Page SEO | Website Speed Optimization | Core Web Vitals | Schema Markup | Internal Linking Strategy | Landing Page Development | Conversion Rate Optimization Figma to WordPress | Figma to Shopify | Webflow Development | Responsive Web Design | HTML5 | CSS3 | Tailwind CSS | UI/UX Implementation
$40 hourly
Michael C.
- 4.8
- (11 jobs)
Sliema, TAS-SLIEMA
Blockchain
Cost Control
Business Modeling
Financial Planning
Cost Accounting
Bookkeeping
Digital Business Modeling

CPA focused on accounting in Malta and accounting automation. Founder of Accora. I can help you in a number of different things, be it accounts, vat, tax, company formation, audit and more.
$95 hourly
Attiq R.
- 5.0
- (11 jobs)
Bolton, ENGLAND
Blockchain
Smart Contract
Cisco Certified Network Associate
Python
Full-Stack Development
Network Administration
Game Development
Web Development
Check Point
App Development
iOS Development
Firewall
Cisco ASA
Network Security

✅🌟CCSM Elite Certified (Checkpoint Certified Security Master Elite) CISSP ISC2 Certified, CCNP Security (Cisco Fire Power) and Palo Alto NGFW Engineer Certified🌟✅ 🌟Experienced Network Security Specialist with 15+ years history with Check Point, Cisco ASA, and Palo Alto Firewalls and CISSP Certified🌟 ⚒Extensive work experience with Check Point VSX, MDS, Quantum Smart-1 Cloud, Check Point Infinity, Cloud Guard Connect/Edge, Harmony End Point, Cloud Guard SaaS (Now Harmony Email & Office), Cloud Guard Connect/Edge (Now Harmony Connect and Quantum Edge) alongside working with Enterprise level clients⚒ ⚡Done numerous Check Point upgrades over the last ten years on different topologies, including standalone, distributed, cluster and virtual environments from R75.x to R81.x⚡ 🥇Cisco ASA firewall experience with valid CCNP Security certification🥇 💡Palo Alto Certified NGFW Engineer 💡 💡ISC2 CISSP Certified 💡 🥇 Working towards ISO 27001 lead Auditor Certification 🥇 🌟 WHY CHOOSE ME OVER OTHER FREELANCERS? 🌟 ⚡ Client-Focus: I focus on providing VALUE to all my clients. ⚡ Work Ethic: Going the “extra mile” is core to my work as a Freelancer. ⚡ Responsiveness: I am responsive and keep all lines of communication readily open with my Clients. ⚡ Kindness: One of the most important aspects of my life is to treat everyone with respect, be empathetic in all situations.
$45 hourly
Nikolai S.
- 5.0
- (3 jobs)
Bangkok, BANGKOK
Blockchain
API Development
Solana
macOS
Software Architecture & Design
VIPER
Back-End Development
Swift
Solidity
Rust
Kotlin
Android
iOS
Network Security
iOS Development
VPN

Software engineer with 7+ years of experience specializing in Rust systems programming, back-end architecture, and blockchain development. 4+ years building production Rust applications for high-performance, safety-critical systems. Expert in leveraging Rust's ownership model and concurrency primitives to solve complex threading challenges in mission-critical middleware. Architected and optimized high-scale VPN infrastructure serving millions of users, utilizing Rust's zero-cost abstractions for performance gains. Built complete Solana DEX from scratch using Rust/Anchor framework, implementing automated market makers, liquidity pools, and sophisticated fee collection mechanisms. Deep expertise in async Rust, tokio runtime optimization, and systems-level performance tuning. Additional background includes 3+ years mobile development (15+ iOS/macOS apps in Swift/Objective-C, Android in Kotlin), with proven ability to architect cross-platform solutions. Consistently delivers memory-safe, high-performance solutions for demanding distributed systems, leveraging Rust's type system and tooling ecosystem to eliminate entire classes of bugs while maintaining bare-metal performance.
$35 hourly
Sabin N.
- 5.0
- (5 jobs)
Banepa, PROVINCE 3
Blockchain
Test Development
AWS Application
Web3
RSpec
Ruby on Rails
SQL
Amazon Web Services
Golang
MongoDB
Node.js
Docker
Linux
React

JS? Ruby? Golang? Microservices/Monoliths! Golang - Gin, Gorm, sqlx, Cobra, ReactJS and Typescript NestJS(CQRS, MVC), NextJS Ruby/Rails ~ JSON APIs, Sidekiq! JSON APIs in Rails background job processing with sidekiq! and Redis Web3 World Connecting smart contracts with API/Frontend with Web3JS, EthersJS Spinning Blockchain Nodes, Scaling Nodes I dumped entire Bitcoin/Ethereum blockchain data into PostgreSQL/MongoDB Ops and Monitoring EC* in AWS, Other services like S3, Lambdas etc..etc Autoscaling instances, ECS Terraform AWS with Terraform, CDK, pulumi Docker, CI/CD, Self Hosted Github Runners, BuildKite etc. Monitoring apps with Prometheus/Graphana combos, Datadog Deploying LLMs, open source applications, scaling and configuration, setup monitoring tools.
$50 hourly
Saba M.
- 5.0
- (7 jobs)
Tbilisi, TB
Blockchain
React
Scripting
Truffle
DApps
Node.js
web3.js
Solidity
Smart Contract
Blockchain Development
Ethereum
JavaScript

I am Saba, a freelance full-stack developer based in Tbilisi, Georgia. I have over 10+ years of experience in Web Development and 4+ years in blockchain development. My goal is to put maximum effort and deliver the best quality product. Skills: Programming Languages: • Solidity • Typescript • Sass • Python • PHP Libraries/APIs: • Node.js • React • Vue • Web3.js • Ethers.js Frameworks: • Truffle • Next.js • Node.js Databases: • MySQL • MongoDB • PostgreSQL Query Languages: • GraphQL
$60 hourly
Uttkarsh J.
- 5.0
- (15 jobs)
Ahmedabad, GUJARAT
Blockchain
Real Estate
Travel
Healthcare IT
FinTech
Product Strategy
SQL
Apache Solr
Oracle PLSQL
Java
Scala
HubSpot
Blockchain Development
Agile Software Development
Datastax Cassandra

Strategic Product Owner/ Solution Architect with 12 years of experience, including 7 years of progressive roles in the Agile/Scrum SDLC. Innate curiosity, talent and passion to leverage technology for developing enterprise-level solutions. A team leader skilled in managing people and processes while developing motivated, high performing staff eager to take on challenges and work collaboratively to contribute to the organization's growth plan. - Product Aha, Jira Roadmaps, Product Analysis, Product Prioritization, Product budgeting, Technical assessment - Scrum Master All Scrum Tools like Atlassian Suite(Jira, Bitbucket, Confluence),FreshRelease,Asana , Role and Responsibilities, Product Delivery, Team Co-ordination - Domains Fintech, Travel, CRM , HealthCare, Block Chain, PropTech, Web3 -DATABASES NOSQL, DataStax, Cassandra, Scylladb, MySQL, Oracle DB, Sql server, Db2, Graph - FRAMEWORKS ADF, Play, Spring (Core Spring, Spring JPA, Spring Security), Hibernate, Apple Web-Objects -LANGUAGE & SCRIPTING java, PHP, shell scripts, Scala,C, C++, -SERVERS Apache, Nginx, CentOS, Ubuntu, Windows, distributed data, EC2, RDS and Linux systems - Cloud AWS, GCP, Azure, Vultr - ELK Stack - CRM HubSpot Expert, FreshSales Expert
$45 hourly
Akhil B.
- 4.9
- (25 jobs)
Bangalore, KARNATAKA
Blockchain
DApps
Cryptocurrency
Solana
Tezos
Ethereum
Bitcoin
React
Node.js
web3.js
NFT Marketplace
Solidity
Smart Contract
Blockchain Development

⭐⭐⭐⭐⭐ "Akhil is totally fantastic. His work had a tremendous impact on our product. He is very punctual, responsive, and professional in every way imaginable." Hi, I’m Akhil — a full-stack developer and AI/Web3 engineer with over 6 years of experience. I help startups and teams turn ideas into real, working products. Whether it's building smart contracts, AI tools, or full platforms from scratch, I can jump in and get things done fast. 🔧 What I Can Do ✅ 6+ years of Web3 experience: smart contracts, DeFi, NFT platforms, on-ramp/off-ramp payment systems, and more ✅ AI + Full Stack Development: skilled with Solidity, React, Node.js, TypeScript, Go, Python, OpenAI, LangChain, and cloud setup ✅ I run Coding Sheep: a small dev agency that helped launch 20+ Web3 and AI products in the past 4 years ✅ Clear and constant communication: you'll always know what's going on with your project 🚀 Projects I’ve Worked On ❤️ Mooz – A marketplace for AI-generated music ❤️ Density – A crypto exchange for trading derivatives ❤️ LiveWager – Real-time online casino and betting platform ❤️ 3dSpot – AI tool that turns 2D images into 3D models 🏆 Why Clients Like Working With Me 1️⃣ Trusted to Deliver – I focus on building real value, not just completing tasks 2️⃣ Easy to Work With – I reply fast, stay available, and keep everything clear 3️⃣ Can Work in Any Codebase – Whether the code is new, messy, or old, I can pick it up quickly and start improving it 4️⃣ I Solve Problems – I don’t stop at writing code — I help you figure out what works best for your product If you're building something in Web3 or AI, or just need a reliable engineer to get things moving, I’d love to hear from you.
$60 hourly
Nurpais O.
- 4.8
- (77 jobs)
Kara-Balta, CHÜY
Blockchain
Cryptocurrency
Crypto Wallet
OAuth
NestJS
Solana
Ethereum
Ethers.js
Solidify
Smart Contract Development
web3.js
JavaScript
Web3

I build full-stack web apps and Web3 products that actually work in production. 70+ projects on Upwork, $70K+ earned, Top Rated. Recent wins: Government services platform - declarative forms generated from XML specs, real-time WebSocket events, and complex approval workflows. Built and shipped end to end. Nest.js, TypeScript, PostgreSQL. AML/KYC compliance dashboard for a fintech client - role-based access, drag-and-drop workflows, multi-language support, 2FA. React/Next.js, TypeScript, Tailwind. E-signature platform - document lifecycle, hash-based verification, plan billing. Full-stack, deployed on Vercel. How I work with AI: I use Claude Code, MCP, and custom agents to move fast - but I own the architecture and review every line. Nothing AI-generated ships to prod unchecked. That's the part that matters on fintech and gov work. What I work with: - Frontend: React/Next.js, Vue/Nuxt, TypeScript, Tailwind, GSAP, Astro - Backend: Node.js/NestJS, Python, PostgreSQL, Supabase, REST APIs, WebSocket - Auth: Keycloak, OAuth2/OIDC, SSO, RBAC - Web3: Solana (Anchor, Rust), EVM (ethers.js, viem, wagmi), Helius - AI: Claude Code, MCP integrations, custom agent workflows I reply fast, communicate async, and write clean code any developer can pick up the next day. Got a project in mind? Send me the details and I'll tell you how I'd build it.
$70 hourly
Denys D.
- 5.0
- (13 jobs)
Lisbon, LISBON
Blockchain
Solidity
Ethereum
User Interface Design
Startup Company
UX & UI
WordPress
Prototyping
UX Research
Website Redesign
Interaction Design
Webflow
Landing Page
Web Design
User Experience Design

I design and ship complex products end-to-end — from idea to launch. SaaS, Fintech, Web3(crypto), and premium brand sites where execution and taste both matter. Track record: Lead designer at a Web3 product company — took the platform from zero to launch (design system, dashboards, trading flows, dApp UX). 100+ shipped interfaces across fintech, DeFi, and SaaS over 9 years. What I do: • Complex product UX — financial workflows, dashboards, trading UIs, dApp flows. I translate manual, messy processes into clean, scalable systems. • Premium landing pages in Framer — editorial, minimal, modern luxury. References I love: Apple, Aesop, Notion. • Custom 3D heroes (Cinema 4D, Spline), scroll interactions, micro-animations — production-ready, responsive, CMS-ready. • Design systems built from scratch — 100+ components, scales with the product. Edge: SEO, GEO, and Agentic SEO baked in from day one — your site gets surfaced by Google and AI agents (ChatGPT, Perplexity, Claude). AI-assisted workflow (Figma MCP + Claude, Framer AI) cuts delivery time without cutting quality. Stack: Figma · Framer · Cinema 4D · Spline · Webflow · Design Systems Looking for someone exceptional — not just another designer? Let's talk.
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