Backend Developer (Java & Python, Microservices)

3 requirements, read out of the advert rather than guessed from the job title:

• Python
• Java
• Spring Boot

Also mentioned, not required: RabbitMQ, Docker, Kubernetes, English (B2). Worth having, but their absence is not what gets a CV filtered out.

See how often each of these is required across open backend roles in Europe.

Your mission Your mission is to design 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 satellite operators throughout their entire mission lifecycle. You'll work primarily on external customer projects with a Python-based tech stack, while also contributing in parallel to our products built on Java Spring Boot. You design and implement robust microservices that process and distribute large volumes of orbital and telemetry data to deliver reliable APIs and automation processes. You already bring solid experience and take independent ownership of parts of the backend architecture across both environments. You'll work on the systems that enable satellite operators and space agencies to analyze, coordinate, and protect their missions in an increasingly crowded space environment. Studies show that women are less likely to apply for a position if they don't meet 100% of the requirements. Please know that we explicitly encourage you to apply if this applies to you, as long as you bring a passion for space technology, reliable software development, and sustainable use of space. OKAPI:Orbits already brings together a highly diverse team and is actively committed to growing that diversity further, since studies show that heterogeneous teams achieve better results and drive innovation.

Your tasks and responsibilities Design, develop, and maintain asynchronous, microservice-based backend systems, primarily in Python for external customer projects and in parallel in Java Spring Boot for our products

Implement and optimize data processing and distribution pipelines that handle large volumes of orbital, telemetry, and mission data

Design and maintain message-based communication structures between microservices (e.g., via RabbitMQ or comparable message brokers)

Collaborate closely with space engineers and scientists to translate mission-related requirements into scalable, robust software solutions

Share responsibility for the backend architecture across both tech stacks, with a focus on performance, fault tolerance, and maintainability