Senior Blockchain Engineer
Company Overview & Vision
Founded in Singapore in April 2026, CITA Lab is a dynamic software development startup dedicated to building high-quality, custom blockchain-related products tailored specifically to our customers' requirements. Our diverse product lineup includes centralized/decentralized cryptocurrency exchange solutions, secure crypto wallets, smart contracts, dApps, and more. We turn complex blockchain capabilities into seamless, secure, and intuitive user experiences for clients worldwide.
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