๐๐๐ง๐ญ ๐ญ๐จ ๐ ๐จ ๐๐ซ๐จ๐ฆ ๐ข๐๐๐ ๐ญ๐จ ๐ฅ๐๐ฎ๐ง๐๐ก ๐ข๐ง ๐ ๐ฐ๐๐๐ค๐ฌ? Less process theatre, more execution - that's the whole pitch.
๐ฅ ๐ ๐ฒ๐๐๐ฎ๐ด๐ฒ ๐บ๐ฒ "๐ฆ๐ง๐๐ฅ๐ง" for a ๐ ๐๐๐ ๐๐-๐ฆ๐ข๐ง technical audit - know exactly what you need before you spend a cent ๐ฅ
We've shipped regulated FinTech platforms, SaaS products, and eCommerce builds across 15+ industries - GovTech to Web3 to jewelry retail. Same team, same standard, every time.
๐ฅ ๐๐ฎ๐ซ ๐๐ฑ๐ฉ๐๐ซ๐ญ๐ข๐ฌ๐:
โช๏ธ SaaS & MVP Development: React, Next.js, Node.js, NestJS, TypeScript, PostgreSQL
โช๏ธ eCommerce Development: Shopify, WooCommerce, custom platforms
โช๏ธ Website & Brand Systems: WordPress, Laravel, UX/UI
โช๏ธ Blockchain & Web3 Development: Solidity, Rust, smart contracts, tokenomics, wallet integration - Ethereum, Solana, EVM chains
โช๏ธ CRM & Automation: HubSpot Certified, Zoho CRM, n8n/Make
โช๏ธ Performance Marketing & SEO: Google/Meta/TikTok Ads, SEO/AEO/GEO - certified partner
โช๏ธ Marketing Analytics: GA4, GTM, Looker Studio, funnel & attribution dashboards
โช๏ธ AI & Data Engineering: predictive models, ML pipelines, risk-scoring
โช๏ธ Project & Program Management: Jira, ClickUp, agile delivery, roadmap planning
โช๏ธ Infrastructure: AWS, Vercel, Stripe
๐ฅ ๐๐จ๐ฉ ๐๐ซ๐จ๐ฃ๐๐๐ญ๐ฌ:
-- AutoGeld24: idea to live ad campaign in 3 weeks, 74 leads at โฌ9 CPL
-- Lemox: 2,035+ investors reached, 10.93% response rate, BaFin-regulated
-- Wurth: 121% average quarterly KPI, 4 quarters straight
๐ฅ Trusted by: Wรผrth, NAGA, Atlant 3D, Arima Genomics, PSM, Leverdata, Linki
Got an idea or a brief? Either works - message us and we'll take it from there.
Full-Stack Development
Blockchain Development
React
Node.js
Next.js
TypeScript
NestJS
Flutter
PostgreSQL
REST API
Python
Web Application Development
API Development
Docker
Automation
SaaS Development
Web3
Zapier
Make.com
Stripe
Andriy K.
Lviv, Ukraine
$35/hr
5.0
73 jobs
Full Stack Developer and technical partner with 10+ years of experience building SaaS platforms, cloud applications, and complex digital products from idea to production.
โญ 5.0 client feedback
๐ 100+ successful client partnerships
๐ค AI-enhanced engineering with Claude and modern AI tools
๐ Founder & CEO of Softonix
I work with startups, scale-ups, and established businesses that need more than a developer who simply completes tickets.
Need one senior technical partner? I can work hands-on. Need more firepower? I can bring in the right engineers from my team while staying directly involved in your project.
I help take products from an idea, prototype, or legacy system to a production-ready solution, covering technical planning, architecture, frontend, backend, cloud, integrations, QA, deployment, and ongoing development.
โก WHAT SETS ME APART
โ From idea to production
I look beyond individual tickets and focus on the product, users, workflows, and business goals behind the code.
Before development starts, I help clarify the technical approach, key workflows, risks, and feature priorities so engineering time goes where it creates the most value.
โ AI-enhanced development
I actively use Claude and modern AI engineering tools to accelerate code analysis, implementation, rapid prototyping, and repetitive development work.
The result is faster execution combined with senior technical judgment around architecture, code quality, security, and long-term maintainability.
โ End-to-end technical ownership
Discovery โ Architecture โ Frontend โ Backend โ APIs โ Cloud โ QA โ Deployment โ Maintenance
Whether we're launching a new SaaS product or modernizing an existing platform, I focus on building software that is ready for real users and future growth.
๐ CORE EXPERTISE
Frontend: React.js, Next.js, Vue.js, Nuxt, Angular, TypeScript, JavaScript, Tailwind CSS
Backend: Node.js, .NET, ASP.NET Core, REST APIs, microservices
Cloud & architecture: AWS, Azure, cloud-native applications, SaaS architecture, scalable systems, third-party integrations
Mobile: Flutter, React Native, cross-platform mobile applications
AI engineering: Claude, LLM integrations, AI APIs, AI-assisted development workflows, AI-enabled SaaS products
My hands-on and team experience spans SaaS, analytics, HRTech, marketplaces, AdTech, automotive software, FinTech, e-commerce, and mobile products.
๐ค SOLO WHEN IT FITS. TEAM WHEN IT SCALES.
As the Founder & CEO of Softonix, I've helped 100+ clients navigate complex technical challenges while balancing delivery speed, product quality, and development costs.
Depending on the project, I can work hands-on or bring in the right engineers from my team while staying directly involved in the technical direction and delivery.
You get direct communication and senior technical involvement, with access to experienced frontend, backend, Flutter, React Native, QA, and cloud engineers when the project needs more capacity or specialized expertise.
Softonix is your engineering team when you don't have one, and your extra firepower when you do โก
Send me an invite and letโs get started!
Back-End Development
Full-Stack Development
Software Development
JavaScript
React
Node.js
Vue.js
Python
HTML
MySQL
Tailwind CSS
Web Application
AI-Generated Code
AI Development
TypeScript
Claude
Front-End Development
Vlad M.
Uzhgorod, Ukraine
$45/hr
5.0
4 jobs
I work as a Full Stack Developer, Web3 Developer and Blockchain Developer building production-ready applications that connect business logic with blockchain infrastructure. As a Web3 Developer, I focus on wallet integrations, smart contract interactions, and scalable dApp architecture. As a Blockchain Developer, I design and implement secure, efficient systems on top of modern blockchain networks. As a Full Stack Developer, I ensure everything works end-to-end, from frontend to backend, clean, scalable, and maintainable.
As a Web3 Developer, Blockchain Developer, and Full Stack Developer, Iโve worked on real-world products involving NFT platforms, DeFi systems, and exchange-related applications. My main specialization as a Web3 Developer and blockchain developer is building integrations between applications and blockchain networks, including wallet connections, contract execution, and real-time data handling. I work deeply with blockchain infrastructure, ensuring applications behave reliably under real user conditions.
The projects Iโve worked on include:
- NFT platforms as an experienced nft developer: landing-based apps, SPA and multi-page applications, NFT marketplaces, hybrid exchange systems, and Uniswap forks
- Smart contract integrations as a Blockchain Developer: contract interaction using web3 and ethers libraries, handling transactions, events, and contract state as a smart contract engineer
- Wallet integrations as a Web3 Developer: Metamask connections, custom Web3 context implementations, and secure interaction flows
- Backend systems as a Full Stack Developer: building services with Node.js and TypeScript, working with MongoDB (Mongoose), PostgreSQL (Supabase), and Prisma for NFT data and application logic
- Blockchain data querying as a Blockchain Developer: using Apollo Client with Uniswap subgraphs to fetch and process on-chain data efficiently
- Gas optimization as a Web3 Developer: creating services that fetch gas price predictions and apply them to outgoing transactions
- Exchange integrations as a Full Stack Developer: working with Binance API, order creation, and financial workflows
As a Web3 Developer and Blockchain Developer, I have strong experience working with solidity, including creating ERC20 mintable tokens and handling contract deployment pipelines with Hardhat. As a Blockchain Developer, I have also handled migration of NFT systems from Ethereum to non-Ethereum environments, adapting logic, contracts, and integrations accordingly. As a Web3 Developer, I ensure compatibility across different chains and environments.
On the frontend, as a react developer and web developer, I build modern, responsive interfaces using React, Next.js, and TypeScript. Iโve worked with Material UI, styled-components, Bootstrap, SCSS, and CSS modules, ensuring clean UI systems and maintainable code. On the backend, as a Full Stack Developer, I design APIs, manage data flows, and ensure consistency across distributed systems.
Iโve also worked with state management (Redux, Redux Toolkit, redux-localstorage-simple), data layers (Prisma, MongoDB, PostgreSQL), and tooling (ESLint, Prettier), ensuring code quality and long-term maintainability across projects.
As a Web3 Developer, Blockchain Developer, and Full Stack Developer, I focus on performance, reliability, and scalability. Many blockchain products fail not because of the idea, but because of weak implementation. As a Web3 Developer, I make sure integrations with wallets and smart contract systems are stable and predictable under real usage. As a Blockchain Developer, I focus on transaction correctness, contract behavior, and data consistency. As a Full Stack Developer, I ensure the entire system behaves correctly across frontend, backend, and infrastructure.
In addition, as a Web3 Developer, I work on improving UX around blockchain interactions, reducing friction for users interacting with nft platforms and contract-based systems. As a Blockchain Developer, I focus on writing efficient and maintainable solidity code. As a Full Stack Developer, I connect all layers into usable, scalable products.
Beyond blockchain, my broader experience as a web developer, wordpress developer, and mobile app developer allows me to approach projects from a full product perspective, ensuring usability, performance, and scalability in real-world conditions.
I continuously improve as a Web3 Developer, Blockchain Developer, and Full Stack Developer, staying up to date with modern tools, frameworks, and best practices across blockchain and web development. If youโre looking for a Web3 Developer, Blockchain Developer, or Full Stack Developer to build NFT platforms, smart contract systems, or scalable applications connected to blockchain, I can help deliver a reliable, production-ready solution.
Blockchain
Full-Stack Development
Blockchain Development
Cryptocurrency
Ethereum
Smart Contract
Software Development
Solidity
React
Node.js
Python
JavaScript
HTML
HTML5
Bootstrap
jQuery
PHP
SaaS Development
Next.js
CSS 3
Vladyslav K.
Dnipro, Ukraine
$45/hr
5.0
38 jobs
Is your blockchain product ready for real users, or is it a prototype that breaks under live transactions? Most Web3 projects fail at the boundaries between smart contracts, wallets, trading operations, and backend systems.
๐ 20+ years architecting production systems at principal engineer level
๐ $200K+ earned on Upwork across 32 architecture projects
๐ฏ 100% Job Success Score, Top Rated Plus on Upwork
โก 11 years architecting Fintech / Trading / Accounting solutions
โก 8 years architecting blockchain products across Bitcoin, EVM, Solana ecosystems
๐ผ CEO at Osambit, a 20-person engineering team
โ Enterprise Blockchain Architect certified, former Sr Principal Engineer at Nordstrom
โญโญโญโญโญ "We've had the opportunity to collaborate with the Osambit team, and it's been a great experience. They're highly professional, responsive, and truly understand the final goal. Their technical expertise and ability to deliver on time have been key to the success." (Alwyn V., IXO World)
As a Blockchain Architect with 20+ years of production engineering experience and two years focused on Web3, I design blockchain and fintech products that operate reliably beyond a demo. I work across Solana and EVM networksโincluding Ethereum, Polygon, Base, BSC, and Arbitrumโas well as enterprise platforms such as Hyperledger Fabric and Besu. My work connects secure smart-contract, wallet, payment, and remittance flows with the backend systems, operational controls, and user experiences a real product needs. Every engagement starts with architecture: chain selection, custody and transaction boundaries, compliance-aware workflows, failure modes, scalability, and security. That architecture-first approach helps blockchain and neobanking products withstand live usage, not just testnet scenarios.
๐ถ Centralized exchange: architecture for trading operations, wallet flows, and reliable backend integration
๐ถ Custodial wallets: secure custody, transaction handling, and multi-wallet platform architecture
๐ถ Trading automation system: real-time blockchain-integrated trading workflows with operational safeguards
๐ถ Liquidity automation system: DeFi and liquidity-management automation across Solana and EVM ecosystems
๐ถ Fintech, neobanking & remittance apps: payment, account, wallet, and cross-border transfer architecture
๐ถ Bitcoin mining facility control panel: operational dashboard and control-system architecture for mining infrastructure
๐ถ Blockchain-integrated game: NFT features, token and wallet integrations, and production-ready game backend design
๐ถ Enterprise blockchain solutions: permissioned-network architecture and public-chain integrations using Hyperledger Fabric or Besu
๐ถ Nordstrom (Sr Principal Engineer, 5 years): architected 9+ enterprise systems | led 10 offshore engineering teams | supply chain, payment, logistics domains
WHAT I DO
โ Blockchain Architecture: chain selection, system design, security boundaries, and production rollout planning
โ Solana Development: Rust programs, SPL standards, RPC integrations, and high-throughput DeFi systems
โ EVM & Smart Contracts: Solidity development and integrations for Ethereum, Polygon, Base, BSC, and Arbitrum
โ Wallet & Custody Systems: custodial wallet architecture, secure transaction handling, and multi-wallet integrations
โ Fintech, Neobanking & Remittance: payment flows, account and wallet systems, cross-border transfers, and operational controls
โ DeFi, Trading & Liquidity Automation: trading workflows, liquidity systems, DEX integrations, and operational controls
โ NFT & Tokenized Products: NFT minting, metadata, marketplace and royalty logic, and blockchain-integrated game features
โ Enterprise Blockchain: Hyperledger Fabric and Besu solutions, permissioned-network architecture, and API or oracle integrations
โ Full-Stack Web3 Platforms: React interfaces, Node.js or Python backends, web3 integrations, and real-time transaction services
โ Production Infrastructure: AWS, Docker, Kubernetes, CI/CD, observability, automated testing, and scalable data systems
WHO I WORK WITH
๐ฏ B2B and B2C companies building blockchain products, fintech and neobanking apps, exchanges, wallets, DeFi platforms, or games
๐ฏ Founders and CTOs who need Web3, payment, or remittance systems running in production with real users and real assets
๐ฏ Teams with multi-week engagements (4+ weeks minimum), not 5-minute tasks
๐ฏ Companies that understand blockchain architecture is a system design and security problem, not just a smart-contract problem
๐ฏ Clients who value senior engineering judgment over the cheapest hourly rate
MY PROCESS
1๏ธโฃ Architecture Review: 24-hour turnaround on an initial system map, risk review, and scope estimate for your blockchain or fintech product. Close collaboration with business and deep domain immersion.
2๏ธโฃ Design: chain selection, smart-contract, wallet, payment, and remittance boundaries, backend integration, and security plan
3๏ธโฃ Build: production blockchain or fintech
Blockchain
Solana
Blockchain, NFT & Cryptocurrency
Bitcoin
Blockchain Architecture
Blockchain Development
Cryptocurrency
Ethereum
Smart Contract
Web Development
JavaScript
Python
Node.js
API
React
Tokenomics
Amazon Web Services
Decentralized Exchange
PHP
Trading Automation
Viacheslav I.
Kyiv, Ukraine
$35/hr
5.0
3 jobs
We are a Blockchain & Web3 development team delivering full-cycle solutions - from idea to mainnet launch
Our core focus is building scalable, secure, and production-ready Web3 products using modern tech stack and proven architecture.
๐ง Our Tech Stack
Blockchain:
Solidity, EVM (Ethereum, Arbitrum, BNB Chain, Polygon, Avalanche), Smart Contracts, Web3 integrations
Frontend:
React.js, Next.js, Web3.js, Ethers.js, Wagmi, WalletConnect
Backend:
Node.js, Express.js, NestJS, REST APIs, WebSockets
Mobile:
React Native (Web3 wallets, mobile dApps)
Infrastructure:
Docker, AWS, CI/CD, Hardhat, Foundry
๐ผ What We Build
Smart Contracts (ERC20, ERC721, ERC1155)
Token Development & TGE Launch
DeFi Platforms (staking, lending, yield farming)
DApps (full-stack Web3 applications)
Launchpads & IDO Platforms
Crypto Payment Integrations (on/off-ramp, wallets)
Custom Web3 Dashboards & Admin Panels
(ัะตะฐะปัะฝะพ ะฒัะดะพะฑัะฐะถะฐั ะฒะฐัั ะบะตะนัะธ ัะธะฟั ัะพะบะตะฝัะฒ, TGE, launchpad )
โ๏ธ How We Work
End-to-end development (Smart Contracts + Frontend + Backend)
Clean, maintainable and scalable architecture
Security-first approach (testing, audits, best practices)
Fast delivery with clear milestones
๐ง Why Clients Choose Us
Strong expertise in Web3 / Blockchain / DeFi
Experience with tokens, staking, launchpads, and complex dApps
Deep understanding of product + business logic, not just code
Dedicated team (Blockchain + Frontend + Backend + PM)
๐ฉ Letโs Build Your Web3 Product
If you are looking to build a token, DeFi platform, dApp or full Web3 ecosystem - we can help you deliver it fast and right.
Blockchain
Blockchain Architecture
Blockchain Development
Cryptocurrency
Ethereum
Rust
Smart Contract
Solidity
Node.js
web3.js
JavaScript
Web3
React
TypeScript
CSS
SQL
PHP
WordPress
Python
Angular
Mikhail D.
Kharkov, Ukraine
$39/hr
5.0
30 jobs
โ 50+ SaaS projects successfully completed, 14+ MVP done
2๏ธโฃ8๏ธโฃ of them in the payments and fintech space - including PSP platforms, payment orchestration systems, hosted fields & checkout flows, and trading platforms for fintech clients. Hands-on integration experience with Stripe, Apple Pay, iDEAL, PayPal and other major payment gateways.
๐ TOP RATED PLUS | In Top 3 Laravel Developer | Payment Systems Expert | AI-Powered SaaS Specialist | PHP Laravel Developer
๐ 7+ Years Experience | Senior Architect specializing in scalable backend architecture and high-load PHP Laravel Developer ecosystems
๐ AI Strategist | Building AI-powered and AI-assisted workflows, integrating AI solutions for custom SaaS products and No-Code/Low-Code integrations
๐ Rapid MVP Delivery | From concept to production-ready launch in 4-6 weeks as a Full Stack Laravel Vue specialist
๐ Proven Track Record | 100% Job Success with 5-star feedback from enterprise and startup clients in the USA, Europe, and the UAE
Hello to my future clients and collaborators!
I'm Mike - a Senior Full Stack Laravel Vue Developer and Laravel Developer. As a Laravel consultant and Laravel expert specializing in AI-powered SaaS and Fintech, I build modern web applications combining powerful Laravel backend with clean Vue.js and React interfaces built with HTML5, CSS3, and Bootstrap. I also work with WordPress for content-driven platforms and Ruby on Rails for rapid application development.
MY DEVELOPMENT JOURNEY
Early in my career, I focused on mastering PHP, clean architecture, security and performance, and the Laravel ecosystem, including WordPress and Ruby on Rails projects.
Today, as a PHP Laravel Developer, I lead complex projects using Laravel full stack, Vue, React, and Node-based APIs, delivering scalable and secure applications supporting real business growth. Whether it's a SaaS platform, admin panel, WordPress site, or integrating APIs-driven product, I work as a Laravel Developer who understands both business logic and technical scalability. All code is versioned with Git.
WHAT I HELP WITH:
1๏ธโฃ. Laravel & Full Stack Web Development
I'm a Full Stack Laravel Vue developer who builds everything from Laravel codebase to modern JavaScript interfaces, including WordPress themes and Ruby on Rails applications.
As a PHP Laravel Developer and Laravel backend specialist, I specialize in:
โ Advanced Laravel development with Livewire, Filament, and Symfony
โ Frontend with Vue.js, React, Alpine.js, Tailwind CSS, Bootstrap, and CSS3
โ WordPress custom themes, plugins, and CMS solutions
โ Ruby on Rails rapid application development
โ Clean architecture, security and performance-focused PHP
โ MySQL, PostgreSQL, MariaDB integration
โ Scalable backend architecture for long-term growth
2๏ธโฃ. RESTful & GraphQL API Development
As a Laravel Developer and Laravel expert, I build robust backend API systems:
โ RESTful & GraphQL APIs with Laravel
โ Backend API and third-party services integrations for modern web applications
โ WebSockets for real-time Laravel platforms
โ Stripe integration, Firebase, Google Drive, integrating AI solutions via OpenAI API
3๏ธโฃ. SaaS Architecture
As a Full Stack Laravel Vue developer, I design scalable and secure applications that scale:
โ Existing Laravel codebase modernization and extension
โ Multi-tenant architecture and multi-tenant SaaS dashboards
โ WordPress multisite and Ruby on Rails SaaS solutions
โ API-first architecture for React, Vue, and Node frontends
4๏ธโฃ. Performance & Code Quality
As a Senior PHP Laravel Developer, I focus on:
โ Optimizing code for performance in Laravel and Ruby on Rails
โ MySQL and PostgreSQL database tuning
โ Frontend speed for React and Vue
โ WordPress performance optimization
โ Clean architecture, security and performance
5๏ธโฃ. Admin Panels & Back-Office Systems
As a Laravel Developer, I build modern admin panels that help teams run operations smoothly with dashboards built with HTML5, CSS3, Bootstrap, and jQuery. I also deliver WordPress admin customizations and Ruby on Rails back-office solutions.
I can help with:
โ Filament/Livewire admin panels with role-based access
โ Custom workflows, approvals, audit logs
โ PDF reports, analytics views, and operational dashboards
6๏ธโฃ. E-commerce, Payments & Subscription Systems
If your business relies on payment gateway, subscription product, or checkout flows, I deliver as a Full Stack Laravel Vue expert who understands the full product lifecycle, including WordPress WooCommerce and Ruby on Rails e-commerce solutions:
โ Stripe integration, subscriptions, invoices, and webhooks in PHP Laravel Developer stack
โ Customer portals and secure checkout with HTML5 and CSS3
โ Integrating APIs-first payment systems compatible with React and Vue
Full Stack Specialist in Fintech, Payments, API Integration, Stripe, Payment integration, Payment Gateway, Wallets, API development, Checkout, Saas Fintech, Financial Services, Fintech Platform and Fintech SaaS MVP
Full-Stack Development
PHP
Laravel
JavaScript
Custom PHP
React
Vue.js
HTML
MySQL
CSS
jQuery
Git
Web Development
Web Application
HTML5
PostgreSQL
API Integration
API
WordPress
How it works
Post a job for freePost a job
Tell us what you need. Create your own job post or generate one with AI then filter talent matches.
Hire top talent fast
Consult, interview, and hire quickly, so you can meet the freelancers you're excited about.
Collaborate easily
Use Upwork to chat or video call, share files, and track project progress right from the app.
Payment simplified
Manage payments in one place with flexible billing options. Only pay for approved work, hourly or by milestone.
Don't just take our word for it
โUpwork provides an umbrella-level of security. I can see a talentโs work history and ratings. I can hold payments in escrow. I can communicate through Upwork Messages instead of working through my email address.โ
KD
Kim Darling
Emerald Tiger
โUpwork is the best platform to hire skilled professionals when we're not looking for a full-time employee. All the companies in our portfolio use Upwork to find talent across a wide range of fields.โ
DM
David Merry
Kinetic Investments
โOur very specific requirements can be a challengeโWith Upwork, weโre able to access a bigger community to ensure the success of our projects.โ
Top interview questions to help you hire the right Blockchain developers, faster.
How do I hire a Blockchain Developer in Ukraine on Upwork?
You can hire a Blockchain Developer in Ukraine on Upwork in four simple steps:
Create a job post tailored to your Blockchain Developer project scope. We'll walk you through the process step by step.
Browse top Blockchain Developer talent on Upwork and invite them to your project.
Once the proposals start flowing in, create a shortlist of top Blockchain Developer profiles and interview.
Hire the right Blockchain Developer for your project from Upwork, the world's largest work marketplace.
At Upwork, we believe talent staffing should be easy.
How much does it cost to hire a Blockchain Developer?
Rates charged by Blockchain Developers on Upwork can vary with a number of factors including experience, location, and market conditions. See hourly rates for in-demand skills on Upwork.
Why hire a Blockchain Developer in Ukraine on Upwork?
As the world's work marketplace, we connect highly-skilled freelance Blockchain Developers and businesses and help them build trusted, long-term relationships so they can achieve more together. Let us help you build the dream Blockchain Developer team you need to succeed.
Can I hire a Blockchain Developer in Ukraine within 24 hours on Upwork?
Depending on availability and the quality of your job post, it's entirely possible to sign up for Upwork and receive Blockchain Developer proposals within 24 hours of posting a job description.