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# Senior Backend Developer (IoT / Digital Identity)

- **Company:** Wibit Consulting & Services (WibitCS)
- **Location:** Brussel, Belgium (Remote available)
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** Application Programming Interfaces (APIs), Business Logic, C++ (Programming Language), Code Review, Databases, CouchDB, Data Validation, Data Security, Software Debugging, Digital Signature, Distributed Systems, HTTP Secure, Key Management, PostgreSQL, MongoDB, MySQL, Node.Js, NoSQL, OAuth, Oracle (Applications), Scrum Methodology, Openid Connect, Cloud Services, Blockchain, Swagger, Software Construction, Software Engineering, Subversion, Systems Integration, Openapi, Data Logging, Data Storage Technologies, Cloud Platform System, Backend, Event Driven Architecture, Git Flow, Integration Tests, Kubernetes, Cosmos DB, Web3.js, Front End Software Development, Restful APIs, Splunk, Software Version Control, Dynatrace, Serverless Computing, Docker
- **Published:** July 31, 2026
- **Apply:** https://be.indeed.com/viewjob?jk=d92ccb92ac78bdad

## About the Role

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., 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, 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

## Description

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


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