Talent badge filter
Skills filter
Select talent location
Select talent time zones
$20/hr
99%
Job Success
$200K+ earned
Available now
Start of list.
End of list.
Your blockchain project will generate $500K+ revenue through secure, scalable Web3 solutions that outperform 90% of competitors. I transform complex blockchain ideas into profitable, battle-tested applications with verified smart contracts and measurable business impact.
𝗥𝗲𝗰𝗲𝗻𝘁 𝗖𝗹𝗶𝗲𝗻𝘁 𝗥𝗲𝘀𝘂𝗹𝘁𝘀:
-Deployed DeFi protocol managing $2.3M TVL with zero security breaches over 18 months
-Built an NFT marketplace processing $800K+ in transactions within the first 6 months
-Optimized smart contracts, reducing gas fees by 42% for 50K+ users
-Created a cross-chain bridge handling 15K+ transactions monthly with 99.97% uptime
𝗖𝗼𝗿𝗲 𝗘𝘅𝗽𝗲𝗿𝘁𝗶𝘀𝗲:
𝗦𝗺𝗮𝗿𝘁 𝗖𝗼𝗻𝘁𝗿𝗮𝗰𝘁𝘀 & 𝗦𝗲𝗰𝘂𝗿𝗶𝘁𝘆: Ethereum, Polygon, BNB Chain, Solana using Solidity and Rust. Expert in gas optimization, security auditing, and vulnerability prevention with 200+ deployed contracts.
𝗗𝗲𝗙𝗶 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁: Staking protocols, lending platforms, liquidity pools, and automated market makers (AMMs). Specialized in tokenomics design and yield farming mechanisms.
𝗡𝗙𝗧 & 𝗧𝗼𝗸𝗲𝗻 𝗦𝗼𝗹𝘂𝘁𝗶𝗼𝗻𝘀: ERC-20, ERC-721, ERC-1155 implementations, NFT marketplaces, and custom tokenomics. Experience with 40+ successful token launches.
𝗱𝗔𝗽𝗽 𝗔𝗿𝗰𝗵𝗶𝘁𝗲𝗰𝘁𝘂𝗿𝗲: React/Next.js frontends with Web3.js/Ethers.js integration, MetaMask and WalletConnect implementations, and responsive Web3 user experiences.
We deliver full-cycle, end-to-end blockchain development solutions, spanning DeFi protocols, NFT marketplaces, RWA tokenization, Layer-2 integrations, and advanced Web3 dApp development. Our expertise includes custom smart contract development, enterprise-grade blockchain infrastructure, and seamless integration with modern Web3 ecosystems. We architect secure, scalable, and high-performance decentralized systems designed for real-world adoption and long-term impact.
Our approach emphasizes smart contract audits, zero-trust security architecture, gas optimization, MEV-resistant design, cross-chain interoperability, and on-chain governance models. By implementing rigorous security standards, protocol-level safeguards, and performance optimization strategies, we build blockchain products that meet evolving industry standards and ensure sustainable scalability.
If you are ready to turn your Web3 vision into a production-ready solution, we can support your tokenomics design, DAO framework development, blockchain infrastructure planning, and scalable Web3 roadmap execution, delivering resilient, future-proof decentralized ecosystems aligned with next-generation blockchain innovation.
Associated with
Eminence Internet Technology Pvt Ltd
$10M+
earned
$135/hr
81%
Job Success
$30K+ earned
Offers consultations
Start of list.
End of list.
Highly skilled Smart Contract and Web3 Engineer. Certified in Web3 development, Golang, Rust, Solidity, and Blockchain Security.
Hands-on experience with ERC404, ERC4337, ERC721AC, and other new protocols.
Known for projects like Dash2Trade.com, Metcacade.co, Alpacadabraz.io, I have built a reputation as a Quality programmer in the Web3 space, with a specialism in security. Currently enrolled in Moralis
In any given month, I am working on:
• Smart Contract Audits
• NFT Minting Engines
• Custom Smart Contracts
• Complex dApps and Blockchain Architecture.
• Metaverse/Sandbox Development
• Marketplaces & Decentralised Exchanges
Communication and progress are my keys to success. Once I get started, I manage your project from start to completion.
I also have comprehensive knowledge of subjects as crypto drainers, and the newest create2 mechanisms, as well as other known illicit tools. Feel free to ask me for a consultation on how to best protect yourself against them.
Jarmo V.
has worked
.
$34/hr
100%
Job Success
$30K+ earned
Available now
Offers consultations
Start of list.
End of list.
𝐌𝐨𝐬𝐭 𝐭𝐞𝐚𝐦𝐬 𝐛𝐮𝐢𝐥𝐝𝐢𝐧𝐠 𝐚𝐭 𝐭𝐡𝐞 𝐛𝐥𝐨𝐜𝐤𝐜𝐡𝐚𝐢𝐧 𝐚𝐧𝐝 𝐀𝐈 𝐢𝐧𝐭𝐞𝐫𝐬𝐞𝐜𝐭𝐢𝐨𝐧 𝐠𝐞𝐭 𝐭𝐡𝐞 𝐚𝐫𝐜𝐡𝐢𝐭𝐞𝐜𝐭𝐮𝐫𝐞 𝐰𝐫𝐨𝐧𝐠 𝐨𝐧 𝐝𝐚𝐲 𝐨𝐧𝐞. 𝐈’𝐦 𝐭𝐡𝐞 𝐝𝐞𝐯𝐞𝐥𝐨𝐩𝐞𝐫 𝐭𝐡𝐞𝐲 𝐛𝐫𝐢𝐧𝐠 𝐢𝐧 𝐭𝐨 𝐠𝐞𝐭 𝐢𝐭 𝐫𝐢𝐠𝐡𝐭 𝐭𝐡𝐞 𝐟𝐢𝐫𝐬𝐭 𝐭𝐢𝐦𝐞.
4+ years shipping Solana and EVM systems to mainnet and leading the AI agents and LLM-powered systems that run alongside them. Top Rated on Upwork with 100% Job Success across 25+ contracts.
Worked on a government-funded blockchain and AI agriculture platform, alongside building tokens with real market caps, AI-driven Telegram bots, and OCR + LLM pipelines that ship to production. Whether you need a smart contract, an AI agent, or a system that combines both, I deliver mainnet-ready code not prototypes.
𝗣𝗿𝗼𝘃𝗲𝗻 𝗥𝗲𝘀𝘂𝗹𝘁𝘀
✅ Worked on a government-funded blockchain & AI-based agriculture traceability platform using Solana Architecture
✅ Built Web3 Rewards Website → token burn redemption platform deployed on a major Web3 audit platform (SIWE + wallet connect + promo distribution)
✅ Shipped Forge3 → Web3 escrow protocol that hit $200K market cap
✅ Built ClusterFck → Solana token analyzer ($158K market cap) with bundle detection and rug-pull risk scoring
✅ Delivered La Suite du Monde → DAO/NFT membership system for a campaign thats targetting €1M+
✅ Built an AI-driven bot for cross-border blockchain remittances with multi-language LLM support
✅ Delivered an AI-powered OCR + audio digitization pipeline for a production book library system
𝗕𝗹𝗼𝗰𝗸𝗰𝗵𝗮𝗶𝗻 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁
◆ Solana / Anchor / Rust → modular program architecture, SPL tokens, PDAs, CPIs, Jupiter integrations, on-chain data systems
◆ Solidity → 20+ mainnet contract deployments. ERC-20, ERC-721, ERC-1155, staking, vesting, presale, custom DeFi logic. Hardhat, Foundry, OpenZeppelin.
◆ Full-Stack Web3 → Next.js + TypeScript + wagmi/viem + ConnectKit on the frontend. Node.js, Postgres, and Solana/EVM bridges on the backend. SIWE auth, wallet connect flows, production deployment pipelines.
𝗔𝗜 & 𝗔𝘂𝘁𝗼𝗺𝗮𝘁𝗶𝗼𝗻
◆ LLM Integration → OpenAI, Anthropic Claude, and Gemini APIs in production systems
◆ AI Agents & RAG → LangChain, multi-agent orchestration, vector databases, semantic search over domain documents
◆ Workflow Automation → n8n, Make, Telegram bots, AI-assisted alert and trading systems with retry/error handling
◆ AI + Web3 → on-chain AI integrations, intelligent token analyzers, AI-driven dApp features
𝗪𝗵𝘆 𝗖𝗹𝗶𝗲𝗻𝘁𝘀 𝗛𝗶𝗿𝗲 𝗠𝗲
✔ Top Rated with 100% Job Success across 25+ contracts
✔ Mainnet-shipped, production-tested code — not demos
✔ I run a small dev team — can scale up on bigger contracts without losing quality
✔ Honest architectural feedback before you spend an hour coding
✔ Senior-level decisions on architecture, security, and tokenomics from day one
𝗪𝗵𝗮𝘁 𝗖𝗹𝗶𝗲𝗻𝘁𝘀 𝗦𝗮𝘆
⭐⭐⭐⭐⭐ “With over 25 years of professional experience, it’s genuinely rare to come across talent this professional, committed, and reliable. He is without question one of the best developers I’ve worked with.”
~ Erick F.
If you’re building a smart contract, an AI agent, or a system that combines both send me an invite.
Keywords : Blockchain Developer | Solana Developer | Solidity Developer | Smart Contract Developer | Smart Contract Audit | Anchor Framework | Rust Developer | Web3 Developer | dApp Development | DeFi Developer | NFT Marketplace | NFT Development | ERC-20 | ERC-721 | ERC-1155 | Token Development | Staking Contract | Vesting | Presale | DAO | DEX | AMM | SPL Token | Jupiter | PDA | CPI | Hardhat | Foundry | OpenZeppelin | Slither | Mythril | ethers.js | wagmi | viem | web3.js | ConnectKit | RainbowKit | SIWE | MetaMask | Phantom | WalletConnect | Next.js | React | TypeScript | Node.js | Postgres | MongoDB | Laravel | Python | Ethereum | BSC | Polygon | Arbitrum | Base | Optimism | Cross-Chain Bridge | Layer 2 | AI Engineer | AI Agent Development | LLM Integration | OpenAI API | Anthropic Claude | Gemini API | LangChain | LangGraph | RAG Pipeline | Vector Database | Semantic Search | Pinecone | Multi-Agent Systems | Agentic AI | Prompt Engineering | n8n | Make | Zapier | Workflow Automation | Telegram Bot | Discord Bot | Chatbot Development | OCR | Document Digitization | AI + Web3 | Tokenomics | Crypto Trading Bot | MEV | Mainnet Deployment | Top Rated Freelancer
Asad U.
has worked
.
$25/hr
$400+ earned
Start of list.
End of list.
I'm a post-quantum cryptography engineer who has built a complete production-grade PQC blockchain from scratch - QuantaChain - using NIST-standardized Falcon-512 signatures and Kyber-1024 key encapsulation. This is not theoretical: the chain is live on testnet with external node operators, a published SDK, a WASM cryptography module, a Chrome wallet extension, and a block explorer.
I can help you audit your current cryptographic stack for quantum vulnerabilities, migrate to NIST PQC standards, build custom blockchain infrastructure, or integrate AI agents directly into on-chain workflows.
What I've shipped:
1. Live PQC blockchain (Falcon-512 + Kyber-1024) with external validators
2. Falcon-512 WASM module — native-speed PQC in browser and Node.js
3. JavaScript/TypeScript SDK (quanta-sdk on NPM)
4. Chrome extension wallet with PQC signing
5. Block explorer, testnet faucet, mining system
6. Published academic papers on lattice-based cryptography (Zenodo)
7. PQC security audit and migration consulting
$55/hr
100%
Job Success
Available now
Offers consultations
Start of list.
End of list.
🔹 What I build
I build production backend systems that handle real-time distributed traffic at scale using Golang, Python and Node.js.
I focus on systems where latency, reliability, and throughput directly impact production outcomes under high concurrency and event-driven workloads.
I design and implement blockchain integration layers that connect backend systems with Ethereum-based transaction and wallet workflows in production environments.
🔹 Production impact
Focused on building production-grade systems that improve reliability, throughput, and system resilience under real-world traffic conditions.
Built real-time backend systems using Go, Node.js, and Python with Redis Pub/Sub and SSE for high-volume event-driven communication
Designed and stabilized high-throughput API systems and microservice architectures under concurrent production traffic
Developed blockchain transaction and wallet integration systems using Node.js and Ethereum-based stacks in production environments
Implemented smart contract interaction layers and backend services for token and transaction workflows
Built payment and external API integration systems with strong consistency, idempotency, and failure recovery requirements
Operated cloud backend systems on AWS/GCP with scaling, monitoring, and production observability
🔹 Core engineering focus
Distributed backend systems (Go / Node.js / Python)
Event-driven architecture (Redis Pub/Sub, SSE)
Blockchain transaction systems (Ethereum / Web3 integration)
Backend ↔ on-chain data flow design
High-concurrency API systems
Production reliability, scalability, and latency optimization
🔹 How I work
I identify bottlenecks in production systems across latency, throughput, and data consistency.
I implement changes that improve system stability and performance across backend and blockchain layers without disrupting production traffic.
🔹 Availability
Available for backend architecture, blockchain integration, system scaling, and production refactoring projects.
Donggeon L.
has worked
.
$20/hr
100%
Job Success
$6K+ earned
Available now
Offers consultations
Start of list.
End of list.
Most developers ship features. I build systems that stay stable under real usage.
As a MERN + Blockchain engineer, I focus on performance, reliability, and clean architecture. I use blockchain only where it makes financial or technical sense, and I bridge Web2 and Web3 so you get the benefits without unnecessary complexity. I also help startups build MVPs fast, so you can validate ideas before scaling.
What I do:
- Full-stack development: React.js, Next.js, Node.js, MongoDB
- Build scalable SaaS applications and backend systems
- Build MVPs for startups (fast, solid foundations)
- API development and integration
- Fix bugs, broken APIs, and system bottlenecks
- Optimize performance: queries, APIs, load time
- Blockchain integration when needed (Solidity, Ethers.js, Web3.js)
- Fix blockchain integration issues and smart contract problems
- AWS deployment, Docker, CI/CD
Recent Impact:
- Reduced API latency by 40–60% through query optimization and caching
- Restored ~100% transaction reliability by fixing blockchain integrations
- Improved production performance and UX under real user load
If you need to:
- build an MVP or SaaS app
- develop a full stack platform
- integrate blockchain into an existing system
- or fix something that’s already live
I can step in quickly, understand your stack, and get it working properly.
Send me your repo or tech stack. I will review it and tell you exactly what’s wrong and how to fix it.
$150/hr
91%
Job Success
$400K+ earned
Available now
Start of list.
End of list.
𝐄𝐱𝐩𝐞𝐫𝐭-𝐕𝐞𝐭𝐭𝐞𝐝 (top 1% on Upwork) and 𝐓𝐨𝐩 𝐑𝐚𝐭𝐞𝐝 𝐏𝐥𝐮𝐬, with $𝟒𝟎𝟎𝐊+ earned across 𝟏𝟐𝟓+ projects. I'm a founder and full-stack engineer who acts as your technical partner, architecting AI and blockchain systems that work in production, not just in a demo.
Most clients come to me when the build actually matters: when it has to be secure, has to scale, and has to handle real data or real money without breaking. I architect and build custom systems end to end, and I can bring in a vetted team when a project needs more hands. Think of me as a fractional CTO and a builder in one: senior judgment on the strategy, real hands on the code.
A lot of AI talent stops at a clever prompt and a slick demo. I come at it as a systems engineer. I have architected a Layer 1 blockchain hardened with post-quantum cryptography, a decentralized exchange and validator platform, an on-chain tokenization system for commercial real estate, and production AI agents that run real sales and operations workflows. I work natively in fintech and regulated systems, so I'm as fluent in tokenomics, compliance, and data-heavy infrastructure as I am in the code itself. If your AI or your protocol has to be correct, not just impressive, that is the gap I fill.
𝐖𝐇𝐀𝐓 𝐈 𝐁𝐔𝐈𝐋𝐃
• AI agents and automation: multi-agent systems, LLM integration, RAG, and automation wired into your real tools and data
• Custom full-stack software: React / Next.js, Node.js, Go, Rust, and databases, built and shipped end to end
• Smart contracts and protocols (EVM and Solana): audited, gas-optimized, production-ready
• DeFi and tokenization: staking, swaps, liquidity, governance, and real-world-asset / on-chain systems
• AI for fintech and on-chain: the rare overlap of AI, blockchain, and financial systems, done by one person who understands all three
• Technical strategy: architecture, security review, tokenomics, and the roadmap to get there
𝐖𝐇𝐘 𝐂𝐋𝐈𝐄𝐍𝐓𝐒 𝐇𝐈𝐑𝐄 𝐌𝐄
• 𝐄𝐱𝐩𝐞𝐫𝐭-𝐕𝐞𝐭𝐭𝐞𝐝 and 𝐓𝐨𝐩 𝐑𝐚𝐭𝐞𝐝 𝐏𝐥𝐮𝐬: roughly the top 1% of Upwork talent, with $𝟒𝟎𝟎𝐊+ earned and 𝟏𝟐𝟓+ projects delivered
• A founder's perspective: senior judgment on strategy, with real hands on the code
• Security and correctness first: audits, hardening, and systems trusted to move real value
• Senior, direct communication and predictable, on-time delivery
If you are building an AI product or a custom platform, automating real operations, launching a protocol, or tokenizing real-world assets, and you want a technical partner who will get it right the first time, let's talk.
Ramy D.
has worked
.
$15/hr
31%
Job Success
$2K+ earned
Start of list.
End of list.
Web3 Full Stack Developer with 4+ years of blockchain experience and 2+ years in professional roles. I specialize in smart contracts, DeFi systems, NFT bridges, and cross-chain tools like LayerZero and ERC-4337. From solar-powered validator networks to tokenized RWA lending, I deliver scalable and secure Web3 solutions. Skilled in Solidity, Rust, and modern frontend frameworks like React and Next.js.
Mohamed Yessine M.
has worked
.
$25/hr
100%
Job Success
$60K+ earned
Available now
Start of list.
End of list.
I work with startups and businesses to build blockchain products, AI-powered systems, and scalable web applications that are designed for real users ........... not just technical demos.
Over the last 8+ years, I’ve helped clients develop everything from DeFi platforms and crypto wallets to automation systems, AI integrations, and full-scale SaaS products. My focus is always on building products that are secure, practical, and ready to grow.
I enjoy working closely with founders and teams who care about creating solid long-term products, whether that means launching a new Web3 platform, improving an existing application, or integrating AI into business workflows.
Areas I Commonly Work On
Blockchain & Smart Contract Development
Web3 Applications
AI Agents & Workflow Automation
DeFi & Crypto Platforms
NFT & Tokenization Projects
Full-Stack SaaS Development
API & Backend Architecture
Product Scaling & Optimization
Tech Stack
Blockchain:
Solidity, Ethereum, Solana, Rust, Hyperledger, Web3.js, Ethers.js
Frontend:
React.js, Next.js, TypeScript, TailwindCSS
Backend:
Node.js, NestJS, Python, Go, REST APIs
What You Can Expect Working With Me
Clear communication
Reliable delivery timelines
Clean, maintainable code
Attention to performance and scalability
A practical approach focused on business goals
I prefer building long-term working relationships and contributing to projects where thoughtful engineering and product quality actually matter.
If you have an idea you’re exploring or a product you want to improve, feel free to reach out.
$100/hr
100%
Job Success
$300K+ earned
Available now
Start of list.
End of list.
💎 AWS Certified - Verified by Upwork
💎 Google Certified - Verified by Upwork
💎 Microsoft Certified - Verified by Upwork
I am a seasoned Project / Tech Manager with a deep specialization in Machine Learning and Blockchain technologies. With a strong background in managing complex, cross-functional projects and a passion for leveraging cutting-edge technologies, I am committed to driving innovation and excellence in every endeavor.
As my career progressed, I specialized in Machine Learning. I worked on numerous projects that involved developing predictive models, natural language processing systems, and computer vision applications. My approach always integrates the wisdom of our ancestors with the analytical rigor required in this field. One notable project involved creating a predictive maintenance system for a manufacturing client, which reduced downtime by 40% and saved significant operational costs.
Simultaneously, I ventured into the world of Blockchain. The principles of decentralization and trustless transactions align closely with Native American communal values. I led the development of a Blockchain-based supply chain solution that enhanced transparency and traceability for a major logistics company. This project not only streamlined operations but also instilled greater trust among stakeholders.
💎 Main Skills:
✔ Project Management: Agile, Scrum, Kanban, Waterfall, Jira, Asana, Trello, Slack
✔ Machine Learning: Python TensorFlow, Data preprocessing, Model Deployment, DeepSeek, Chatgpt
✔ Blockchain: Smart contracts, Solidity, Rust, Ethereum (ERC-20, ERC-721, ERC-1155, etc), Hyperledger, Decentralized applications (DApps), Mev Bot, C++
✔ Data Analysis: SQL, Pandas, Data Visualization
✔ Communication: Stakeholder management, conflict resolution, team leadership, client relations
✔ Quality Assurance: Risk management, performance monitoring, continuous improvement
Shivam P.
has worked
.