Senior Backend Developer (IoT / Digital Identity)

💻 Senior Backend Developer (IoT / Digital Identity) 🌐

🌍 Now partnering with a leading company on a cutting-edge IoT project!

📍 Remote — anywhere in the EU region | ✈️ Occasional travel to Belgium required | 📅 Start: Mid-September | 🗣️ English

Are you a seasoned backend engineer with deep expertise in decentralized identity, blockchain, and secure API design? 🔐 We're looking for a Senior Backend Developer to join an exciting IoT-based project, building scalable, secure server-side solutions from the ground up. 🚀

📋 Responsibilities

👉 Develop back-end website applications
👉 Integrate front-end elements with server-side logic
👉 Implement core business logic
👉 Design and implement data storage solutions
👉 Apply data & security best practices — input validation, auth, secure storage, compliant logging 🔒
👉 Optimize applications for speed and scalability ⚡
👉 Design and develop APIs
👉 Participate in scalable software architecture design
👉 Maintain code integrity and organization
👉 Write clean, functional backend code
👉 Compile & analyse data to troubleshoot issues and improve performance
👉 Perform unit/integration testing, debugging, and validation
👉 Deliver solutions aligned with functional & non-functional requirements
👉 Write technical documentation 📝
👉 Configure cloud services for backend functionality (serverless, storage, Kubernetes)
👉 Implement authentication & authorization mechanisms
👉 Maintain unit/integration tests within CI/CD pipelines
👉 Manage project scope, schedule, budget, risks & stakeholders

✅ Requirements

🔹 5+ years in software engineering (full-stack, backend, frontend, distributed systems)
🔹 5+ years designing scalable, secure, maintainable cloud architectures
🔹 5+ years delivering software in Agile/Scrum environments
🔹 3+ years with Decentralised Identity (DID) & W3C Verifiable Credentials
🔹 3+ years implementing OpenID4VCI and OpenID4VP
🔹 3+ years with secure credential issuance, verification & digital wallet integration
🔹 3+ years with cryptographic workflows, digital signatures & key management
🔹 3+ years developing blockchain-based/distributed-ledger solutions ⛓️
🔹 3+ years performing code reviews & software engineering best practices
🔹 3+ years with Digital Product Passport solutions

📄 Must-Have (CV)

🔸 10+ years backend programming (Go, C++) & server-side frameworks (Node.js)
🔸 10+ years with APM tools (Dynatrace, Splunk, Elastic APM) + OpenTelemetry
🔸 7+ years with relational (PostgreSQL, Oracle, MySQL) & NoSQL (MongoDB, CouchDB, CosmosDB) databases
🔸 7+ years with version control workflows (GitFlow, trunk-based, SVN)
🔸 7+ years designing/securing RESTful APIs (OpenAPI/Swagger)
🔸 7+ years with containerisation & orchestration (Docker, Kubernetes) 🐳
🔸 4+ years with OAuth 2.0, OpenID Connect, W3C VCDM, DIDs, SD-JWT
🔸 2+ years defining digital signature standards
🔸 5+ years with blockchain/DLT integrations, smart contracts, event-driven architecture
🔸 3+ years with Ethers.js and Web3 integrations (wallet connectivity, transaction signing)
🔸 1+ year with Zero-Knowledge Proofs (ZKP) for privacy-preserving proofs

📩 Ready to build the future of secure digital identity? Apply now!

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