(Senior) Backend Developer (Java Python, Microservices)

Your mission is to develop and maintain a scalable asynchronous backend that powers OKAPI:Orbits end-to-end solutions across mission design Space Situational Awareness (SSA) Space Traffic Management (STM) Flight Dynamics (FD)and Space Traffic Coordination (STC) supporting the full lifecycle of satellite operators.

You design and implementrobust Java-based microservices that process and distribute large volumes of orbital and telemetry data enabling reliable APIs and automation pipelines.
You work on the systems that allow satellite operators and space agencies to analyse coordinate and protect their missions in an increasingly congested space environment.

• Design develop and maintain asynchronous microservice-based backend systems in Java with selected components or utilities in Python
• Implement and optimize data processing and distribution pipelines handling large volumes of orbital telemetry and mission data
• Design and maintain message-based communication between microservices (e.g. via RabbitMQ or similar brokers)
• Collaborate closely with space engineers and scientists to translate mission requirements into reliable scalable software solutions
• Take ownership of backend architecture ensuring performance fault tolerance and maintainability across distributed services
• Define and document implementation plans from system design to deployment in a cloud-native environment
• Maintain a high level of code quality automated testing and compliance with security and engineering standards
• Improve CI/CD pipelines observability and automation to support continuous delivery and system stability
• Analyze and resolve complex issues in distributed systems focusing on efficiency and robustness
• Work in small interdisciplinary teams contributing backend expertise to cross-functional projects

• Degree in Computer Science Software Engineering or a related field or formal IT specialist training
• Several years of professional experience in backend software development with Java (Spring Boot or similar)
• Good working knowledge of Python for scripting automation or data processing tasks
• Solid understanding of microservice architectures asynchronous systems and distributed communication patterns
• Experience designing and maintaining RESTful and/or message-based APIs (e.g. RabbitMQ)
• Strong grasp of software architecture principles including modular design scalability and maintainability
• Hands-on experience with testing code quality assurance and secure software development practices
• Familiarity with Git-based workflows CI/CD pipelines and modern DevOps practices
• Knowledge of observability tools (DataDog Sentry OpenTelemetry or similar)
• Experience with database technologies (MongoDB PostgreSQL or similar)
• Experience with automated testing frameworks and performance benchmarking
• Ability to plan implement and review complex features in collaboration with engineers and scientists
• Background or interest in the space or aerospace domain
• Proactive communication structured working style and good English written and spoken

• Experience with containerization and orchestration (Docker Kubernetes)
• Understanding of security concepts encryption and authentication (OAuth2 OpenID Connect)
• Familiarity with agile methodologies (Scrum or Kanban) and collaboration tools (Jira Confluence)
• Experience in technical leadership code reviews and maintaining coding standards

• Flat hierarchysmall teams flexible hours
• Onboarding inBraunschweig afterwardson-site in Brunswick orhybrid in Brunswick or Munich
• Early ownershipinfluence technical direction
• Training budget for continuous development
• Corporate benefits like BahnCard 25/50 bike leasingGerman classes via Lingoda
• Joinspace events and conferences advocate for sustainable space
• Free office drinks monthly company lunch regular after-work activities