Blockchain Full Stack Developer (Golang, Solidity, JS) - Only Lisbon-based Candidates

Location: Remote (Only for candidates based in Lisbon)

Candidates outside the European Union will not be considered.

Salary: $80K - $110K

Muxon is currently recruiting for an innovative decentralized finance (DeFi) project that is building an on-chain derivatives trading venue (DEX). Their mission is to bring traditional finance’s largest asset class into the blockchain ecosystem. Designed for professional traders and sophisticated retail traders, the project’s products are built with scalability, security, and precision in mind. With recent backing from a prominent European VC and a successful beta launch, the team is distributed between London (business) and Lisbon (engineering).

Role Overview:

We are seeking a talented Blockchain Full Stack Engineer with a focus on Golang and Solidity to join the team. This role is perfect for someone eager to have a major impact in a well-funded project at an early stage. Ideal candidates will be based in Lisbon or willing to relocate with work authorization. Experience with trading technology is preferred but not mandatory.

Key Responsibilities:

1. Backend/Frontend Development & Security:

• Develop, maintain, and optimize backend services tied to the protocol.
• Ensure the protocol’s scalability, fault tolerance, and data consistency.
• Build APIs for front-end consumption and third-party integrations.
• Conduct thorough code reviews, vulnerability assessments, and penetration tests.
• Stay updated on security threats, ensuring protocol resilience.

2. Protocol Design & Smart Contract Development:

• Design, develop, test, and deploy smart contracts on EVM blockchains (Arbitrum, Ethereum, Optimism, Base, Polygon, etc.).
• Optimize smart contracts for gas efficiency and adhere to best security practices.
• Work with external audit firms for code reviews and audits.

3. Collaboration & Leadership:

• Collaborate with product and research teams to design new DeFi products and services.
• Work closely with other engineers, researchers, and designers to ensure smooth development.
• Mentor junior developers, fostering a collaborative, innovative environment.
• Provide clear documentation and training materials for the team.

Qualifications:

• Bachelor’s or Master’s degree in Computer Science or a related field.
• Extensive backend development experience with Golang, Solidity, and EVM blockchains.
• Proven experience in developing smart contracts on Ethereum or other major blockchain networks.
• Strong experience with frontend development (React.js, Angular.js, etc.) is a plus.
• Familiarity with decentralized oracles, layer 2 solutions, and cross-chain technologies.
• Passion for blockchain, DeFi platforms, and financial innovation.
• Excellent attention to detail, especially regarding security and scalability.
• Strong verbal and written communication skills.

Nice to Have:

• Experience working on DeFi projects related to trading, lending, or derivatives.
• Exposure to other blockchain platforms or technologies.
• Contributions to open-source blockchain projects.

Additional Details:

• Strong experience in Golang and distributed systems is required.
• Experience in Solidity development, ideally in production environments, is highly valued.
• Startup experience is preferred.
• Must be based in Lisbon or willing to relocate with work authorization.

If you are an experienced Blockchain Full Stack Engineer with a focus on Golang and Solidity, and you're passionate about DeFi and blockchain technologies, we encourage you to apply!