Senior Developer – Backend

This is a fully remote position, open to applicants in Hungary.

📋 Description

• Take ownership of backend services throughout their entire lifecycle: design, implementation, testing, deployment, operation, and ongoing enhancement.

• Convert product and business needs into sustainable technical designs while effectively communicating risks and trade-offs.

• Create and implement secure, versioned REST APIs while maintaining OpenAPI contracts.

• Develop backend services utilizing Node.js and TypeScript with PostgreSQL/PostGIS.

• Design database schemas, manage transactions, create indexes, and perform backward-compatible migrations; optimize intricate SQL queries.

• Establish integrations with Kafka, AWS S3, GeoServer, and both internal and external APIs.

• Implement automated unit and integration tests and contribute to API contract, end-to-end, and performance testing.

• Enhance observability through structured logging, metrics, tracing, health checks, and actionable alerting.

• Troubleshoot defects and production incidents, engage in root-cause analysis, and execute preventive improvements.

• Contribute to CI/CD pipelines and manage containerized services on OpenShift/Kubernetes.

• Review merge requests, mentor engineers, and uphold engineering and quality standards.

• Maintain API documentation, document architectural decisions, and create operational runbooks.

• Utilize AI-assisted development tools responsibly while ensuring accountability for code accuracy, security, privacy, and maintainability.

⛳️ Requirements

• Significant professional experience with Node.js and TypeScript, including asynchronous programming, production debugging, and type-safe application design.

• Strong SQL and PostgreSQL expertise, encompassing data modeling, transactions, indexing, query-plan analysis, and connection pooling.

• Experience in designing and maintaining RESTful APIs and OpenAPI specifications.

• Familiarity with automated backend testing using Jest or Vitest and tools like Supertest.

• Practical knowledge of distributed systems and microservice design, including failure handling, idempotency, and backward-compatible interfaces.

• Experience with authentication, authorization, input validation, and secure backend development practices.

• Proven experience in operating production services, including monitoring, troubleshooting, and incident analysis.

• Ability to lead technical discussions, articulate trade-offs, provide constructive code reviews, and mentor peers.

• Professional working proficiency in English.

• Additional valuable experience with PostGIS, GeoJSON, coordinate reference systems, or other geospatial technologies.

• Additional valuable experience with Kafka and event-driven architecture.

• Additional valuable experience with AWS S3 and secure object-storage patterns.

• Additional valuable experience with Docker and OpenShift/Kubernetes.

• Additional valuable experience with Knex.js or similar SQL query and migration tools.

• Additional valuable experience with OpenTelemetry, Prometheus, Grafana, or structured logging platforms.

• Additional valuable experience with NGINX and API gateway or reverse-proxy configuration.

• Additional valuable experience with Python services or data-processing workflows.

• Additional valuable experience with GitLab CI/CD, API linting, container security scanning, and automated release pipelines.

🏝️ Benefits

• Remote working opportunity within Hungary.

• Chance to work with Deutsche Telekom IT Solutions, a subsidiary of the Deutsche Telekom Group.

• Mentoring and engagement in a cross-functional engineering team.