Junior Frontend Engineer (Ground Segment)

the team designs, builds, and operates the satellites, systems, and platforms that make our missions possible. It’s a highly collaborative environment where ideas become real hardware, software, and data solutions that deliver impact from space. Our Ground Segment team builds and runs the software that powers Open Cosmos missions. From our cloud-native Mission Operations Centre (MOC) to customer-facing tools, they design, deploy, and operate the systems that keep multi-satellite constellations flying. Working with modern technologies — microservices, Kubernetes, Go, RabbitMQ, Postgres, and Terraform — they follow an agile, DevOps-driven approach. Every engineer owns their work end-to-end, from design and code to testing and operations, with plenty of space to suggest improvements and shape how they work. What You'll Be Doing As a Senior React Front End Engineer, you’ll design, build, and optimise the mission operations user interface that powers Open Cosmos satellite missions. You’ll write and ship production-ready React code, implementing features that improve usability, performance, and scalability. You’ll work closely with operators, designers, and product owners to turn

requirements into clear, intuitive user interfaces. You’ll review code, mentor other developers, and champion React best practices. As our software grows, you’ll tackle performance challenges, improve reliability, and continuously enhance our tools, processes, and CI/CD workflows. What You’ll Bring We care more about what you can do than where you learned it — if you’re excited by the mission, we’d love to hear from you even if you don’t tick every box. To thrive in this role, you’ll bring: Strong programming skills in React and TypeScript, with a focus on building clean, maintainable, and scalable applications. Confidence working with state management solutions like Redux, Zustand, or Context API. The ability to write and maintain unit and integration tests to keep components reliable. A deep understanding of front-end performance optimisation techniques and when to apply them. Comfort working with CI/CD pipelines to support smooth and reliable deployments. A habit of promoting React-specific best practices and improving front-end workflows. Clear, collaborative communication — able to partner effectively with designers, product owners, and backend engineers. For this role you can be based in any of our locations: Harwell, UK Barcelona, Spain Porto, Portugal Athens, Greece Tenerife, Canaries To apply, you must have the legal right to work in your chosen location. Why Open Cosmos? Work at the cutting edge of space technology with customers around the globe. A mission-driven company making space accessible to help solve real-world challenges. A diverse, ambitious, and supportive team. Division CTO Department GROUND SEGMENT Role Senior React Front End Engineer Locations Harwell, UK, Athens, Greece, Barcelona, Spain, Porto, Portugal, Tenerife Remote status Hybrid Employment type Full-time About Open Cosmos Open Cosmos is dedicated to solving customer problems with insights from space. Whether this is monitoring agricultural yields, assessing the damage of oil spills or providing navigation solutions, we believe that data from satellites is the most effective and sustainable way of achieving this. Apply for this job CTO · GROUND SEGMENT · Multiple locations · Hybrid React Frontend Developer (Ground Segment) Loading application form Career site Data & privacy Manage cookies Employee login Candidate Connect login Already working at Open Cosmos? Let’s recruit together and find your next colleague. Log in Applicant tracking system by Teamtailor

A meeting lands on your calendar

If they’re a yes, I book the chat. You show up — that’s the whole job-hunt.