Senior Backend Developer

Stack

Responsibilities

• ▹Own backend services throughout their lifecycle: design, implementation, testing, deployment, operation
• ▹Translate product and business requirements into maintainable technical designs
• ▹Design and implement secure, versioned REST APIs and maintain OpenAPI contracts
• ▹Develop primarily with Node.js and TypeScript, using PostgreSQL/PostGIS for relational and geospatial data
• ▹Design database schemas, transactions, indexes, and backward-compatible migrations; optimize complex SQL queries
• ▹Build integrations with Kafka, AWS S3, GeoServer, and internal or external APIs
• ▹Implement automated unit and integration tests and contribute to API-contract, end-to-end, and performance testing
• ▹Build observability through structured logging, metrics, tracing, health checks, and alerting
• ▹Diagnose defects and production incidents, participate in root-cause analysis
• ▹Contribute to CI/CD pipelines and operate containerized services on OpenShift/Kubernetes
• ▹Review merge requests and mentor engineers
• ▹Maintain API documentation, architectural decisions, and operational runbooks

Requirements

• ▹Strong professional experience with Node.js and TypeScript, including asynchronous programming and production debugging
• ▹Strong SQL and PostgreSQL skills: data modeling, transactions, indexing, query-plan analysis, connection pooling
• ▹Experience designing and maintaining RESTful APIs and OpenAPI specifications
• ▹Experience with automated backend testing using Jest or Vitest and Supertest
• ▹Practical understanding of distributed systems and microservice design, including failure handling and idempotency

About the company

Deutsche Telekom IT Solutions (formerly ITSH) is a subsidiary of the Deutsche Telekom Group and Hungary's largest ICT employer, with more than 5000 employees across Budapest, Debrecen, Pécs, and Szeged.