Senior Developer - Backend

Stack

Responsibilities

• ▹Own backend services throughout their lifecycle: design, implementation, testing, deployment, operation, and continuous improvement
• ▹Translate product and business requirements into maintainable technical designs
• ▹Design and implement secure, versioned REST APIs and maintain their 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; analyze and optimize SQL queries
• ▹Build reliable integrations with Kafka, AWS S3, GeoServer, and internal or external APIs
• ▹Implement automated unit and integration tests
• ▹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
• ▹Use AI-assisted development tools responsibly

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
• ▹Experience with authentication, authorization, input validation, and secure backend development
• ▹Experience operating production services, including monitoring and incident analysis
• ▹Ability to lead technical discussions, review code, and mentor colleagues
• ▹Professional working proficiency in English

Nice to have

• ▹PostGIS, GeoJSON, coordinate reference systems, or other geospatial technologies
• ▹Kafka and event-driven architecture
• ▹AWS S3 and secure object-storage patterns
• ▹Docker and OpenShift/Kubernetes
• ▹Knex.js or comparable SQL query and migration tooling
• ▹OpenTelemetry, Prometheus, Grafana, or structured logging platforms
• ▹NGINX and API gateway or reverse-proxy configuration
• ▹Experience with Python services or data

Soft skills

About the company

Digital Construction Support (DCS) is the central platform supporting the digital management and documentation of fiber construction sites in Germany, developed by Deutsche Telekom IT Solutions.