Software Test Engineer, Ground Systems (m/f/d)

Mission Brief As a Software Test Engineer in the Ground Control Systems team, you will contribute directly to the development and maintenance of testing systems aiding the development of new aerospace technologies and platforms. Your Role in Our Space Mission: • Contribute to CI/CD pipelines and DevOps workflows related to testing, automation, and software delivery. • Develop and maintain test plans, test cases, and automate tests where feasible. • Work with existing SIL/HIL setups, helping to extend, debug, and improve them over time. • Support IVVQ activities, including integration testing, verification, validation, and qualification of new firmware and software components. • Perform regression testing and help refine the testing process for faster iteration. • Document test results, identify failure patterns, and share insights with engineering teams. • Collaborate closely with PLC and software engineers to investigate issues discovered in the field and incorporate learnings into the testing pipeline. Qualification Checklist • 4 Years of experience in Software Testing in RTOS environments. • Fluent in English. • Experience with TwinCAT and Python for test automation. • Understanding of testing methodologies for real ‑ time/automation systems. • Hands ‑ on work with test rigs, hardware interfaces, and measurement tools. • Familiarity with data logging, tolerance measurement, and evaluating real-world variability. • Organized and proactive with high attention to detail, with a can-do attitude and outstanding communication skills Bonus Skills • Experience designing or extending custom HIL/SIL test rigs. • Ability to create simulation models (e.g., with MATLAB/Simulink). • Knowledge of safety critical ‑ standards (IEC 62061, ECSS-Q-80, ECSS-E-40, ECSS-Q-40, FAA AC 450.141 ‑ 1A). Benefits • Employee Participation Program: Share in our success through our virtual company share program • 30 days of vacation: Enjoy the days off to relax and recharge • Company pension plan: Secure your future with our company pension plan, featuring a 20% employer contribution after the probation period • Subsidised lunch: Stay energised with delicious, subsidised lunches every day • Public transport ticket: Commute with ease using a fully financed Deutschlandticket • Rental clothing with laundry service: Enjoy hassle-free workwear with our convenient rental clothing and laundry service • Sport Clubs membership: Stay fit with our sponsored sports club memberships (EGYM Wellpass) • Individual learning allowance: Grow your skills with an individual learning budget granted after the probation period • Childcare allowance: Receive a childcare allowance for your non-school-age children • And Much More! Discover additional perks and benefits when you join our team. Who we are We are Isar Aerospace and we are at the forefront of New Space building a modern space business to enable faster, better and cheaper access to space. Our mission is to help democratise space and use it for good in order to improve life on Earth now and for the future generations. We are a fast-growing company aiming to provide sustainable and environmentally friendly launch solutions for small and medium-sized satellites and constellations into Low Earth Orbit. The company is privately funded by world-leading technology investors with strong commitment and support and our team is made of driven and talented people with a real passion for space innovation. We're making rockets in a way that hasn't been done before disrupting a traditional industry. If you are up for the challenge, want to work on cutting-edge projects and be part of a team changing the world for better, come, join us and launch your career! Want to find out more about us? Visit www.i