Web 3 Back-End Software Engineer

Currently, for one of our Partners, we are looking for an experienced Web3 Back-End Software Engineer (m/f/n).

Offer:

• Contract: B2B via SHIMI.

• Mostly remote, services must be performed from within the EU. Occasional travelling to Brussels may be required (the client may request on-site presence in Brussels with 7 days', at contractor's cost).

• Rate: 450-540 EUR/MD netto+VAT

Requirements:

• Education:diploma in IT, Engineering, Mathematics or Physics

• Software engineering, full-stack/backend/frontend/distributed systems: 5 years

• Scalable, secure, cloud-based software architecture: 5 years

• Agile / Scrum delivery: 5 years

• DID and W3C Verifiable Credential solutions: 3 years

• OpenID4VCI and OpenID4VP: 3 years

• Credential issuance, presentation, verification, wallet integration: 3 years

• Cryptographic workflows, digital signatures, secure key management: 3 years

• Blockchain -based and distributed-ledger solutions:3 years

• Code reviews and software engineering best practices: 3 years

• Digital Product Passport solutions: 3 years

• JavaScript, TypeScript, React, Next.js, React Native, HTML5, CSS3, Webpack, Vite: 5 years

• Node.js, NestJS: 5 years

• RESTful APIs, OpenAPI, PostgreSQL, MySQL, MongoDB:5 years

• Solidity, Hardhat, Foundry, OpenZeppelin, ethers.js, token standards: 3 years

• DID, VC, SD-JWT VC, OpenID4VCI, OpenID4VP, SIOP v2, OAuth2, OIDC: 3 years

• ECDSA, hardware wallets, digital signatures: 3 years

• EBSI ecosystem: 3 years

• XML, XSD, JSON, JSON Schema, JSON-LD: 3 years

• Web application security, API protection, OAuth, OWASP: 5 years

• Docker, Kubernetes, GitLab CI, Jenkins, ArgoCD, Git, AWS, Azure, DevSecOps, JIRA, Confluence: 5 years

• English B2 minimum

Tasks

• Development of back-end website applications.

• Integration of user-facing elements developed by a frontend developers with server-side logic.

• Implement core business logic.

• Design and implementation of data storage solutions.

• Apply data and security best practices: input validation, authentication/authorisation, secure storage, compliant logging and monitoring.

• Optimisation of the application for maximum speed and scalability.

• Design and develop APIs.

• Participate in the design and creation of scalable software.

• Maintenance of code integrity and organisation.

• Writing clean, functional code on the backend.

• Compile and analyse data, processes, and code to troubleshoot problems and identify areas for improvement, including setting up and querying monitoring tools.

• Perform unit/integration testing, debug, fix, and validate code changes.

• Deliver solutions that fulfil functional and non-functional requirements and align with user expectations.

• Write technical documentation.

• Basic configuration of cloud services for back-end functionality (e.g., serverless functions, storage accounts, managed Kubernetes).

• Develop and maintain services and business logic using one or more back-end programming languages.

• Implement authentication and authorization mechanisms to secure API endpoints and services.

• Write and maintain unit and integration tests to ensure code quality and reliability, integrating them into the CI/CD pipeline.

• Plan, execute, and control projects by managing scope, schedule, budget, risks, and stakeholders with recognised methods.