Senior Fullstack Software Engineer (m/f/n)

For our client, a European Union Organisation based in Belgium, we are looking for an experienced Full Stack Software Engineer to join a long-term international project.

You will contribute to the development of innovative solutions in the areas of Digital Identity, Web3, Blockchain, EBSI (European Blockchain Services Infrastructure) and Verifiable Credentials. This is a unique opportunity to work on large-scale initiatives supporting the digital transformation of public services across Europe.

Role Overview:
As a Full Stack Software Engineer, you will be responsible for designing, developing, testing, and maintaining end-to-end software solutions, including frontend applications, backend services, APIs, and blockchain-based components.
You will work across the entire software development lifecycle, from architecture and design through implementation, testing, deployment, and production support.

Responsibilities:
• Design, develop, test, and maintain full-stack software solutions.
• Build modern, responsive user interfaces using React and Next.js.
• Design and implement backend services and RESTful APIs.
• Develop and integrate Web3 and blockchain-based solutions.
• Design, implement, and maintain smart contracts on EVM-compatible networks.
• Build and integrate decentralized identity solutions, including DID and Verifiable Credentials.
• Integrate systems with European digital identity and trust-service infrastructures.
• Implement secure authentication, authorization, and cryptographic mechanisms.
• Develop automated unit, integration, end-to-end, performance, and security tests.
• Contribute to CI/CD pipelines, DevSecOps processes, and cloud-native environments.
• Translate business and technical requirements into scalable and maintainable software solutions.
• Produce and maintain technical documentation.
• Collaborate with architects, DevOps engineers, security experts, product owners, and other stakeholders.
• Ensure compliance with security best practices and software quality standards.

Requirements:
•

Education: University degree (minimum Bachelor's or Engineering degree) in one of the following fields: Computer Science, Software Engineering, Electronics, Mathematics, Physics
• Language: English – minimum B2 level (CEFR) Excellent written and verbal communication skills
• Ability to communicate effectively with both technical and non-technical stakeholders in an international environment
• Professional Experience:

• Minimum 10 years of experience in Full Stack Software Development using JavaScript/TypeScript.
• Minimum 3 years of hands-on experience with Web3 and Blockchain-based applications.
• Minimum 2 years of experience implementing Decentralized Identifiers (DID), Verifiable Credentials, and Digital Identity Wallets.
• Minimum 2 years of experience designing and implementing Smart Contracts on EVM-compatible blockchain networks.
• Minimum 2 years of experience designing, developing, and securing RESTful APIs and web services.
• Minimum 2 years of experience working with blockchain-based tokenisation solutions.
• Minimum 2 years of experience delivering projects within the public sector or European institutional environment.
• Minimum 8 years of experience working in Agile/Scrum environments on complex, multi-stakeholder projects.

Technical Skills:
• Backend: JavaScript, TypeScript, Node.js, NestJS, Bun.
• Frontend: React, Next.js, React Native, HTML5, CSS3, Webpack, Vite.
• APIs & Security: REST APIs, OpenAPI, OAuth 2.0, OpenID Connect, JWT, mTLS, OWASP.
• Databases: PostgreSQL, MySQL, MongoDB, Flyway.
• Blockchain & Web3: Solidity, OpenZeppelin, Hardhat, Foundry, ethers.js or viem, ERC-20, ERC-721, ERC-1155, UUPS, Transparent Proxy, Diamond Pattern.
• Digital Identity: DID (Decentralized Identifiers), Verifiable Credentials, EBSI, eIDAS 2.0, OpenID4VP, OpenID4VCI, SIOP v2, EUDI Wallet.
• DevOps & Cloud: Docker, Kubernetes, GitLab CI, Jenkins, ArgoCD, SonarQube, AWS or Azure.
• Application Requirement: Submitted CVs must be provided in Europass format.
•

EU citizenship and work from within the EU required.

What We Offer:
• Long-term B2B cooperation with SHIMI.
• Project duration of up to 48 months.
• Competitive rate of 450–500 EUR/MD.
• Primarily remote work from within the European Union.
• Mostly remote setup. Services must be performed from within the EU. Two physical meetings with the customer are foreseen per 12-month period, max 2 days each. These planned meetings are at contractor’s cost.
• Opportunity to work on cutting-edge Digital Identity, Blockchain, and Web3 initiatives.
• International and multicultural working environment.
• Collaboration with highly skilled professionals from across Europe.