Senior Blockchain Developer - Web3 Scale-up

Senior Blockchain Engineer - De

• Fi / Smart Contracts
• Lausanne, Switzerland (Hybrid) | 80-100% | Permanent contractA fast-growing Swiss technology company is looking for an experienced Senior Blockchain Engineer to strengthen its De
• Fi product team. In this role, you'll be at the heart of designing and building innovative decentralized finance solutions, working in a collaborative environment where new ideas are encouraged and quickly turned into reality. Your

MISSIONS

• Take ownership of the design, development, testing and deployment of smart contracts within a sophisticated De
• Fi ecosystem. - Translate business and product

REQUIREMENTS

into secure, scalable blockchain architectures. - Work hand-in-hand with fellow engineers, product owners and other stakeholders to deliver new blockchain functionalities. - Apply rigorous testing methodologies (unit, integration, fuzzing) to ensure robustness and security. - Help evolve the blockchain infrastructure, improve internal tools, and streamline development workflows. - Keep a close eye on emerging De

• Fi trends, L2 solutions and smart contract best practices to push innovation forward. What You Bring- A deep interest in De
• Fi innovation and blockchain technologies, coupled with strong analytical and problem-solving skills. - The ability to thrive in a fast-moving environment, make informed decisions with partial information, and work autonomously while collaborating effectively. Several years of hands-on blockchain development, including:- Advanced proficiency in Solidity and smart contract security. - Solid understanding of De
• Fi primitives, DEXs, and liquidity mechanisms. - Strong generalist software engineering background (multiple languages, testing, clean architecture). - Experience working in multidisciplinary engineering teams on complex, scalable codebases. Leadership experience is a plus. - Excellent communication skills in English; proficiency in French is a strong asset. Technical Environment of the company- Blockchain: EVM-compatible chains, Solidity, Foundry/Hardhat toolchains, extensive smart contract test coverage including fuzzing and property-based testing. - Frontend: Modern Type
• Script stack with React-based frameworks, tightly integrated with blockchain backends. - Backend & Infrastructure: Node. js, REST/GraphQL APIs, Dockerized services, CI/CD pipelines for rapid iteration and secure deployments. - Architecture: Modular on-chain/off-chain integration, data indexing, monitoring and analytics dashboards to ensure reliability and performance. - Culture: Developer-driven workflows, open discussions on architecture choices, strong emphasis on code quality, security, and peer review. Why Join- Collaborate with a high-caliber team of blockchain specialists to build cutting-edge De
• Fi products. - Benefit from a competitive compensation package aligned with your expertise. - Enjoy a hybrid working model, with two remote days per week and flexible hours. - Contribute to impactful projects at the forefront of the De
• Fi ecosystem.