智能合约 Jobs

Alianza Estratégica: Estructuración de STO para la activación operativa de Brigada Minera El Cordero de Alí, C.A. Estimados profesionales, Reciban un cordial saludo. Me pongo en contacto con ustedes en mi calidad de Responsable de la empresa Brigada Minera El Cordero de Alí, C.A. (RIF J-41226497-4), bajo la dirección de su propietario, el Sr. Jonny Gil. Nuestra compañía posee una alianza minera de diamantes bajo el marco de la Ley Orgánica de Minas de 2026. Contamos con un activo fundamental: estudios técnicos y geológicos de cubicación que certifican con exactitud el quilataje y la calidad de nuestras reservas. Propuesta de Colaboración: Tokenización y Puesta en Marcha Actualmente, nos en...

I’m building an automated model that scans Solidity code on the Ethereum network and flags three critical weaknesses—reentrancy, arithmetic overflow/underflow, and access-control flaws. What I need from you is a working detection engine: it can be rule-based, machine-learning, formal-verification driven, or a hybrid, as long as it reliably pinpoints those issues in typical ERC-20/721 style contracts and produces a clear, human-readable report. I’ll provide sample contracts (both vulnerable and safe) so you can tune precision and recall; feel free to augment with publicly available datasets such as SWC Registry examples. Because this is Ethereum-only work, please focus on Solidity syntax quirks, common library usage (OpenZeppelin), and the nuances of the EVM. If you le...

i want someone who can help me listing my token on decentralized exchange like coingecko coin market cap my token is on tron blockchain

I’m spearheading a new B2B payments rail that lets African businesses move seamlessly between crypto and local fiat. The immediate milestone is a production-grade, multi-chain wallet layer covering BTC, ETH, SOL and stable-coins such as USDT/USDC across ERC-20, TRC-20 and BEP-20. , Solidity or Rust will be your main playground because some smart-contract glue code and low-level services will emerge as we scale. Core wallet requirements • Cross-chain transactions that feel instantaneous to the end user • True multi-currency balances under one address book • Enhanced security: MPC architecture reinforced with two-factor authentication by default and biometric verification for high-value flows. Beyond the wallet, you’ll own the crypto ↔ fiat on/off-ramp ...

I am seeking an expert to assist in listing my token on decentralized exchanges such as CoinGecko and Coin Market Cap. The token is currently on the Tron blockchain. The ideal candidate will have experience in cryptocurrency and blockchain, specifically with Tron, and be able to navigate the process of listing tokens on popular platforms.

Proyecto Completo: Juego 3D Futurista + Ecosistema Crypto – “Grow & Glow Racing” Descripción General Busco un equipo o desarrollador senior capaz de crear un videojuego completo desde cero, incluyendo diseño, programación, arte, blockchain, token, marketplace y página web. El proyecto es un juego 3D futurista de carreras, con estética cyberpunk/neon, donde los jugadores esquivan edificios y recorren una ciudad avanzada. Todo el ecosistema estará integrado con tecnología blockchain (token propio, marketplace, preventas, contratos, recompensas PVE/PVP, etc.). Características Principales del Juego 1. modo PVE 2. Modo PVP 3. Ranking & Torneos Ranking diario, semanal y mensual. Torneos con premios acumulados....

I am building a tokenized residential time-share marketplace where each NFT represents a fractional, 1 day-based stake in a property. Holders must be able to exercise real ownership rights, so the core of the job is the smart-contract logic and the platform layer that sits on top of it. Key objectives • Mint ERC-721 or ERC-1155 tokens that map precisely to calendar slots and legally compliant ownership records. • Provide on-chain voting and decision-making functions (think DAO-style proposals for repairs, upgrades, management, etc.). • Enable seamless peer-to-peer ownership transfers, with automated updates to the cap-table and usage calendar. Front-end needs A clean, mobile-responsive dashboard where users can: – view token holdings, upcoming usage windows, an...

I need a blockchain developer to build a complete crypto payment infrastructure for an existing Node.js and Express web application. The system needs to generate unique HD wallet deposit addresses for each user using BIP44 derivation for Bitcoin, Ethereum, Litecoin, and Solana. When a user deposits crypto to their unique address the system must detect the transaction, verify it on-chain, credit the user's USD balance in the database, and immediately sweep the crypto to the owner's personal wallet. The system must handle ERC20 token deposits for USDT and USDC on Ethereum addresses, detect blockchain reorgs, handle Bitcoin RBF transactions, and include a gas top up bot for Ethereum sweeps. All balance updates must use atomic PostgreSQL transactions with row level locking and an imm...

Looking for a strong Full-Stack Developer to take ownership of the application layer of a Web3 product built with Next.js. The frontend is already designed and partially implemented, and now needs an experienced developer to refine the codebase, replace mock data with live integrations, connect the UI to smart contracts, and build the off-chain backend systems required for production use. This role is ideal for someone who is comfortable working across the full stack — frontend, backend, database, wallet integration, and deployment — and who can turn an existing Web3 interface into a reliable, production-ready application. What You’ll Do Review, clean up, and optimize the existing frontend codebase Replace mock data with real smart contract and backend-connected data fl...

I’m building a new Ethereum-based protocol and need an experienced Solidity engineer to own the entire on-chain side. The contract suite must seamlessly handle deposits, payouts, detailed package/accounting logic, and enforce lifecycle rules—every one of these functions is equally critical to the project’s success. Gas optimisation is my top security priority. I expect custom errors, efficient storage patterns, and tight arithmetic that still protects against re-entrancy and rounding pitfalls. You will design a multi-contract architecture, write clean modular code, and keep NatSpec comments and interface docs current so my frontend developer can integrate without friction. You choose the stack—Hardhat, Foundry, or Truffle—so long as you ship a repeatable d...

BUDGET; 150 CAD, OUTSOURCING, SEE CODE ATTACHED I’m looking for an experienced blockchain developer to review, debug, and fully fix an existing codebase involving advanced DeFi mechanisms, including flash loans and a custom “flash bets” system integrated with ultra-fast, short-resolution markets. Project Context This system is designed to interact with instant-resolution betting markets and prediction markets, where outcomes resolve in seconds. The strategy focuses on arbitrage opportunities where pricing inefficiencies allow for risk-minimized profit when executed correctly and atomically. Important: The current system is not functioning correctly, and part of this job is to identify why (especially flash loans failing) and ensure everything works end-to-end in real...

BUDGET; 150 CAD; OUTSOURCING; SEE CODE ATTACHED I’m looking for an experienced blockchain developer to review, debug, and fully fix an existing codebase involving advanced DeFi mechanisms, including flash loans and a custom “flash bets” system integrated with ultra-fast, short-resolution markets. Project Context This system is designed to interact with instant-resolution betting markets and prediction markets, where outcomes resolve in seconds. The strategy focuses on arbitrage opportunities where pricing inefficiencies allow for risk-minimized profit when executed correctly and atomically. ⚠️ Important: The current system is not functioning correctly, and part of this job is to identify why (especially flash loans failing) and ensure everything works end-to-end in re...

The project centers on a full-featured NFT marketplace that handles everything from minting to secondary sales and timed auctions. I need the underlying smart contracts as well as an intuitive web interface so users can create, list, bid on, and transfer tokens representing real-world and digital assets. Core scope • Solidity smart contracts following ERC-721/1155 standards, plus auction and royalty logic • Integration with a tokenized real-world asset framework so off-chain metadata and compliance checks stay in sync with on-chain events • Front-end built with React, or similar, connected by or • IPFS or comparable decentralized storage for metadata and media files • Deployment scripts and basic CI to push to testnet and mainnet Deliverables 1. Au...