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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