Senior Blockchain Engineer

About BITFIT LABS PTE LTD BITFIT LABS PTE LTD is a Singapore-based blockchain software development company building a wide range of Web3 and blockchain products for global clients. Our team consists of 50+ fully remote engineers, designers, and operators across Singapore, Vietnam, Taiwan, Hong Kong, Japan, and global regions. We develop products including non-custodial wallets, exchanges, smart contracts, dApps, and digital asset infrastructure. We are looking for experienced Blockchain Engineers who can design, build, and maintain secure and scalable blockchain systems across multiple ecosystems. 1. Responsibilities Design and develop smart contracts, blockchain integrations, and Web3 infrastructure Build backend services interacting with EVM and non-EVM chains Develop secure wallet, DeFi, exchange, and staking-related systems Optimize smart contract performance, gas efficiency, and security Participate in architecture design, code reviews, and technical discussions Collaborate with frontend, backend, mobile, DevOps, and QA teams Troubleshoot blockchain node, RPC, indexing, and transaction-related issues 2. Requirements 3+ years of experience at blockchain/Web3 companies Strong understanding of blockchain architecture and decentralized systems Experience with Ethereum, EVM chains, and smart contract development Proficiency in Solidity and at least one backend language (Node.js, Go, Rust, Python, etc.) Experience integrating wallets, exchanges, DeFi protocols, or blockchain infrastructure Knowledge of security best practices and common smart contract vulnerabilities Familiarity with RPC nodes, indexing, event listeners, and transaction lifecycle Experience using Git, CI/CD, Docker, and cloud infrastructure 3. Preferred Qualifications Experience with Layer2, cross-chain, or account abstraction technologies Experience auditing or optimizing smart contracts Familiarity with non-EVM ecosystems such as Solana, Cosmos, or TON Open-source contributions or public blockchain project experience 4. Work Conditions Fully remote Full-time / Part-time / Contract / Freelance available Flexible global team environment Compensation via PayPal, bank transfer, or cryptocurrency