Senior Smart Contract & Backend Developer (Solidity, TypeScript)

About the Role

We are looking for a highly skilled Senior Smart Contract Developer with a strong background in Solidity, TypeScript, and backend engineering. The ideal candidate will be responsible for designing, building, auditing, and maintaining on-chain logic while also contributing to off-chain services, APIs, and database integrations. This position requires strong communication skills in English, attention to detail, and a passion for debugging and problem solving.

Responsibilities

• Architect, develop, and maintain smart contracts primarily using Solidity
• Design and implement secure and gas-efficient on-chain logic aligned with business and protocol requirements
• Integrate blockchain components with backend services written primarily in TypeScript
• Build, document, and maintain REST and/or GraphQL APIs
• Work with databases (SQL/NoSQL), modeling data and ensuring performance and reliability
• Participate in technical planning, code reviews, audits, and security assessments
• Own debugging and testing end-to-end — on-chain, off-chain, tooling and integrations
• Collaborate closely with founders, engineers, auditors, and product stakeholders
• Maintain accurate and clear English-based technical documentation and communication
• Research and propose improvements, best practices, and new capabilities across the stack

Requirements

• 5+ years of professional software engineering experience
• 3+ years of Solidity development experience
• Strong knowledge of Ethereum ecosystem, ERC standards, wallets, gas optimization, and on-chain patterns
• Proficiency with TypeScript, Node.js and modern backend architectures
• Experience building and consuming APIs (REST, WebSockets, GraphQL)
• Solid understanding of data modeling and databases (PostgreSQL, MySQL, MongoDB, Redis or similar)
• Strong testing mindset (Hardhat, Foundry, Jest or similar)
• Excellent debugging skills and passion for deep problem investigation
• Fluent or near-native English communication skills, written and spoken
• Ability to work independently with strong accountability and ownership
• Familiarity with security considerations: reentrancy, flash loans, oracle risks, underflows/overflows, access control, upgradeability, etc.

Nice to Have

• Experience with auditing smart contracts
• Familiarity with Layer 2 and cross-chain patterns
• DevOps familiarity (Docker, CI/CD pipelines, infrastructure as code)

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