Blockchain Jobs

I run a Web3-focused site and want to boost its visibility through published guest posts. Your role is to secure the placement and supply the finished article; I will hand over the exact anchor text and keywords as soon as we start so the copy is fully aligned with my SEO plan. I am open to any reputable crypto, blockchain, or tech publication you already have access to, as long as the site is real, indexed, and relevant to Web3. Feel free to pitch several options and their publishing fees—paid placement is expected and can be rolled into your quote. Once we agree on a target outlet, you will: • Draft an original, engaging piece that naturally weaves in my provided keywords and a single do-follow link back to my project. • Handle all communication with the editor or we...

I’m commissioning a full smart-contract build, from architecture through main-net deployment. The application layer itself is still open-ended, so you’re free to recommend the most suitable chain—Ethereum, BNB Smart Chain, Solana or another EVM-compatible network—provided it meets typical requirements for security, scalability, and broad wallet support. Here’s what the engagement looks like: • Scope: write Solidity (or comparable) contracts, implement upgradeability if justified, optimise gas, and document each function clearly. • Quality: unit tests in Hardhat/Foundry or Truffle with ≥90 % coverage, plus a static-analysis report (Slither, MythX, or similar) to verify there are no critical vulnerabilities. • Deployment: scripts for ...

Our new platform, CritiQ, needs a suite of robust, reusable smart contracts. I already have the product vision, tokenomics draft, and high-level user flows; now I’m ready to turn that vision into audited code. Here’s what I expect from this engagement: • Architecture & specification – refine requirements with me and translate them into a concise technical spec. • Development – implement the contracts in Solidity using best-practice libraries such as OpenZeppelin, with comprehensive unit tests in Hardhat or Truffle. • Security & gas optimisation – apply industry-standard patterns, write clear modifiers, and run automated analysis (Slither, MythX, or similar) before handing the code over for an external audit. • Deployment &am...

I'm looking for an experienced developer to create a Web 3 video chat application for desktop. The platform should integrate multiple Web 3 technologies, including: - Blockchain - Cryptocurrency - Decentralized storage - Smart contracts - Video infrastructure Essential Features: - Secure login/authentication - End-to-end encryption Ideal Skills and Experience: - Proficiency in blockchain technology - Experience with cryptocurrency integration - Knowledge of decentralized storage solutions - Strong background in smart contracts - Expertise in video chat infrastructure development - Strong security practices in app development Please provide a portfolio showcasing similar projects.

Socifi, our real-time Texas Hold’em poker web app, already has the core game loop, React lobby and table UI, and working game logic. The missing piece is a solid back end that persists data and ties everything together. What needs doing right away • Re-enable and wire up MongoDB so user profiles, game states (hands, pots, blinds, results), and transaction/payment records are stored, queried, and indexed efficiently. • Patch the current authentication flow so sign-up, login, and token refresh are reliable across reconnects and multiple tabs. • Activate or complete the half-finished features in the existing codebase (e.g., player avatars, hand history modal, chip top-up) and remove unused remnants. • Prepare environment variables, seeding scripts, and pr...

Looking for an experienced programmer in blockchain and bot development to create an automated bot that does copy trading on the Polymarket platform. Need someone to do everything from start to finish, including setup, testing, and delivery ready to use. Key bot requirements: Monitor specific wallets on Polymarket (I'll provide the addresses). Automatically copy their trades in real time (buy/sell YES/NO contracts in binary markets. Use Polymarket's official APIs (Gamma API for data, CLOB for orders). Run on the Polygon network (compatible with USDC). Simple controls: Slippage filters (max 5%), price range (0.30-0.90), fixed amount per trade ($5-10 initial), and max copy amount ($20-50). Automatic exit options (e.g., sell before expiry or if loss >10%). Basic interface: A Py...

I already have fully designed mobile and web front-ends; what I’m missing is the engine behind them. Your task is to build a production-ready backend that powers a multi-currency wallet, exposes a clean API, and gives me an administrator console I can actually run the business from. Wallet core The service must let every user check their balance, browse an accurate transaction history, and send or receive cryptocurrency with on-chain confirmation. Speed and reliability are paramount, so efficient queueing and retry logic will be essential. Public API I need a REST/JSON (GraphQL is fine if you can prove the advantage) layer that provides secure user authentication, up-to-the-minute cryptocurrency exchange rates, and full transaction processing. Token-based auth, rate-limiting, a...

Im looking to create my own cryptocurrency on the solana blockchain. 5 minutes work 1 billion coins. As low price as possible. 0.000000001$ select all coins - transaction fees on/earn by transactions on. select all coins and release all coins

Im looking to create my own cryptocurrency on the solana blockchain. 5 minutes work 1 billion coins. As low price as possible. 0.000000001$ select all coins - transaction fees on/earn by transactions on. select all coins and release all coins

1.-PROJECT TITLE (Short & Professional) Development of a Blockchain-Based Decentralized Authentication Prototype Integrated with SQL Server 2.-BULLET POINT VERSION (If it asks for key points) You can paste this in the bullet/summary section: Academic research prototype (not a full hospital system) Decentralized authentication using blockchain (smart contract) Integration with Microsoft SQL Server Medical records stored in SQL Server (not on blockchain) Blockchain used for authentication hash validation Architecture documentation required Basic performance observation (authentication response time) Conceptual alignment with GDPR and HIPAA (no legal certification required) Full source code and technical explanation required 3.-FULL DESCRIPTION (Complete Version to Post) Hel...

I have a nearly finished cryptocurrency payment gateway that lets online merchants accept TEXITcoin (TXC) and PUREmedal (PURE). The core smart-contract logic, checkout flow and database schema are already in place, and the stack is React on the front end with a Node.js back end. What I need now is an experienced full-stack Web3 developer who can tie up the loose ends, harden the code and get us to a production launch. Key gaps to close • Merchant dashboard polish – merchants must be able to generate API keys, configure webhooks, and choose between HD/xpub or static wallet addresses. • Checkout edge cases – customers see a payment address and live status updates; the status must stay accurate even on slow or re-orged blocks. • Reliable notifications –...

I have a single wallet address and must understand which exchange or operator controls it. The job centres on transaction-pattern analysis rather than smart-contract performance or general network security. Using your preferred on-chain analytics stack—Etherscan, Blockchair, Chainalysis Reactor, Crystal, or similar—map the flow of funds, identify clustering links, and present evidence strong enough for compliance or investigative review. You will receive: • The wallet address in question • A brief chronology of the activity I have already logged I need back: • A concise report that names the most probable exchange/operator behind the wallet, with screenshots or query exports backing each conclusion • A clear explanation of the heuristics you applied (e.g.,...

Product Overview P2P Crypto Marketplace for Digital Goods A decentralized, escrow-backed peer-to-peer marketplace enabling users to safely trade digital goods (subscriptions, gift cards, licenses, accounts) using cryptocurrency, launched as a Telegram Mini App for instant global reach. The platform eliminates trust issues in digital goods trading by combining KYC verification, smart-contract escrow, and multi-step trade validation. Core Value Proposition Trade digital goods globally with crypto—without trust, fraud, or delays. No chargebacks No middleman holding funds No long onboarding Built for crypto users, not adapted for them How It Works (Trade Flow) User Verification Telegram login (one-tap) Mandatory KYC (basic → advanced tiers) Wallet connection (EVM-comp...

I’m planning to launch a new blockchain-based product and I need an experienced developer who can guide me from concept to main-net deployment. At this stage I’m flexible about the exact stack—Ethereum, Binance Smart Chain, Solana or another network—so I value someone who can weigh the trade-offs and recommend the best fit for scalability, fees, security, and time-to-market. The broad vision includes designing the core smart contracts, creating a native token, integrating a secure wallet flow, and building out any web or mobile front-end required for users to interact with the chain. I also want clear documentation and the test coverage needed for a smooth audit. Deliverables I’d like to see: • Technical roadmap outlining the chosen architecture, toolin...

Product Overview P2P Crypto Marketplace for Digital Goods A decentralized, escrow-backed peer-to-peer marketplace enabling users to safely trade digital goods (subscriptions, gift cards, licenses, accounts) using cryptocurrency, launched as a Telegram Mini App for instant global reach. The platform eliminates trust issues in digital goods trading by combining KYC verification, smart-contract escrow, and multi-step trade validation. Core Value Proposition Trade digital goods globally with crypto—without trust, fraud, or delays. No chargebacks No middleman holding funds No long onboarding Built for crypto users, not adapted for them How It Works (Trade Flow) User Verification Telegram login (one-tap) Mandatory KYC (basic → advanced tiers) Wallet connection (EVM-comp...

Hi I will share the details with the shortlisted candidates. Thanks

Hi I will share the details with the shortlisted candidates. Thanks

I already have a draft smart contract, but it needs a careful review and a few modifications before going live. Once the code is solid, I want it deployed on Ethereum (that is my first choice, though I’m open to discussing BSC or Polygon if you feel they offer clear advantages). After deployment, the contract must be fully integrated into my website so users can interact with it through MetaMask. A smooth, reliable Web3 flow is essential—wallet connection, transaction signing, on-chain confirmations, and any UI feedback should feel seamless and secure. The job breaks down into three main parts: • Audit, adjust, and finalise the existing contract code, then compile, test, and verify it on the chosen network. • Deploy the verified contract and wire it up to the s...

Position: Freelance Smart Contract / Blockchain Engineer Type: Contract / Freelance Location: 100% Remote Workload: Part-time or task-based Compensation: $60–$100/hour (or fixed-price per task) About the Project We are working on DeFi smart contract components, including token implementations and protocol-level logic. Our focus is security, clarity, and real-world usability — not hype. We are building a long-term freelancer pool and looking for engineers who can deliver clean, well-structured Solidity code independently. What You’ll Do Design and implement secure smart contracts using Solidity Work with EVM-compatible chains Review and improve existing smart contract code Follow best practices for documentation, testing, and security Collaborate asynchronously wi...

hello, i'm building a social layer for polymarket but can't place an ordrer trhough i keep getting this error XHR POST [HTTP/3 400 175ms] [CLOB Client] request error {"status":400,"statusText":"","data":{"error":"invalid signature"},"config":{"transitional":{"silentJSONParsing":true,"forcedJSONParsing":true,"clarifyTimeoutError":false},"adapter":["xhr","http","fetch"],"transformRequest":[null],"transformResponse":[null],"timeout":0,"xsrfCookieName":"XSRF-TOKEN","xsrfHeaderName":"X-XSRF-TOKEN","maxContentLength":-1,"maxBodyLength":-1,"...

Need a Solidity dev for a simple MVP: team-based NFT positions + monthly oracle update + reward claim. Contracts only (no frontend). Stack: Solidity + OpenZeppelin + Foundry. Must include tests, deployment script, and clean documentation.

I need a web-based crypto cricket fantasy game. The game should include: - Player selection and management - Live scoring updates - Crypto wallet integration Ideal skills and experience: - Game development experience, especially in fantasy sports - Strong knowledge of cryptocurrency and blockchain technology - Proficient in web development - Experience with real-time data integration for live updates Please provide detailed project proposals.

Hi I will share the details with the shortlisted candidates. Thanks

I’m searching for production-ready AI agents I can roll out across several verticals—specifically Healthcare, Real Estate, E-commerce, Blockchain, Crypto, and Social Media. Each solution must already be live somewhere so I can see it operating in real time before we move forward. The core requirements are straightforward: the agent needs to run in a browser, accept its own knowledge base or document set for context, and ship with source code plus clear documentation. I’m also expecting help getting the code stood up in a SaaS or on-prem environment. I’m flexible on architecture; whether you built it around OpenAI, Claude, Llama, FastAPI, Node.js, Pinecone, FAISS, or Weaviate doesn’t matter as long as it performs reliably at scale. To keep things simple, here...

I’m searching for production-ready AI agents I can roll out across several verticals—specifically Healthcare, Real Estate, E-commerce, Blockchain, Crypto, and Social Media. Each solution must already be live somewhere so I can see it operating in real time before we move forward. The core requirements are straightforward: the agent needs to run in a browser, accept its own knowledge base or document set for context, and ship with source code plus clear documentation. I’m also expecting help getting the code stood up in a SaaS or on-prem environment. I’m flexible on architecture; whether you built it around OpenAI, Claude, Llama, FastAPI, Node.js, Pinecone, FAISS, or Weaviate doesn’t matter as long as it performs reliably at scale. To keep things simple, here...

Hi I will share the details with the shortlisted candidates. thanks

Position: Freelance Smart Contract / Blockchain Engineer Type: Contract / Freelance Location: 100% Remote Workload: Part-time or task-based Compensation: $60–$100/hour (or fixed-price per task) About the Project We are working on DeFi smart contract components, including token implementations and protocol-level logic. Our focus is security, clarity, and real-world usability — not hype. We are building a long-term freelancer pool and looking for engineers who can deliver clean, well-structured Solidity code independently. What You’ll Do Design and implement secure smart contracts using Solidity Work with EVM-compatible chains Review and improve existing smart contract code Follow best practices for documentation, testing, and security Collaborate asynchronously wi...

I am launching a fully-independent blockchain network and need an experienced developer who can take the project from white-paper to mainnet. The chain will run on a Proof of Work consensus, operate inside a closed environment (no external chain bridges), and issue a fiat-collateralized stablecoin that functions much like USDT but lives natively on this new ledger. Beyond the core protocol, I will also require built-in wallet support and a smart-contract layer so third-party developers can deploy dApps once the network is live. Security is paramount; every component—from key management to consensus—must be hardened against common attack vectors and accompanied by clear documentation. Key deliverables • PoW node software and full network setup (testnet + mainnet) &bul...

We are looking for an experienced and reliable lead generation specialist with a strong understanding of the cryptocurrency and blockchain space. Your primary responsibility will be sourcing high-quality, targeted crypto leads based on defined criteria. This may include (but is not limited to): • Identifying potential investors, traders, or crypto-interested users • Sourcing business leads within the blockchain / Web3 ecosystem • Collecting accurate contact details and relevant data • Ensuring leads are verified and up-to-date Requirements: • Proven experience in lead generation (preferably in crypto / blockchain niche) • Strong research skills and attention to detail • Ability to deliver accurate, high-quality data • Familiarity with crypt...

Our new platform, CritiQ, needs a suite of robust, reusable smart contracts. I already have the product vision, tokenomics draft, and high-level user flows; now I’m ready to turn that vision into audited code. Here’s what I expect from this engagement: • Architecture & specification – refine requirements with me and translate them into a concise technical spec. • Development – implement the contracts in Solidity using best-practice libraries such as OpenZeppelin, with comprehensive unit tests in Hardhat or Truffle. • Security & gas optimisation – apply industry-standard patterns, write clear modifiers, and run automated analysis (Slither, MythX, or similar) before handing the code over for an external audit. • Deployment &am...

English: I am planning to build a mobile non-custodial platform for digital token transactions on iOS and Android, including a backend. The software will operate purely with tokens; no fiat processing will occur within the system — fiat transactions will be handled exclusively by connected external partners. In the initial discussion, I expect: • An architecture proposal for Solana, including wallet handling and monitoring logic • Recommendations for the role model: Admin → Distributor → Shop → End Customer • A technical setup for a self-custody wallet with biometric security features • A workflow for QR-based token transfers between roles • A concept for automatic token classification (Clean / Unverified) and an audit trail • A rough ef...