Ground Software Engineer (M/F)
First seen by Alion on Oct 8, 2026. Exotrail scores A on the Alion truth index.
About Exotrail
Space is becoming more strategic and competitive than ever. Tomorrow’s space leaders will not simply launch satellites into orbit, they will be able to move them, reposition them, extend their lifetime, and maximize their performance in space.
Since 2017, Exotrail has been developing and operating cutting-edge in-space mobility solutions for commercial, institutional, and defense customers. From our high-performance propulsion system spaceware™ to our orbital transfer vehicle spacevan™, we enable satellites to go farther, stay operational longer, and achieve more.
Today, more than 200 Exotrailers across Massy and Toulouse are working together to make space operations more efficient and sustainable.
Backed by over €75 million in funding, we are pursuing a clear mission:
Making space a sustainable frontier for future generations.
Job Description
As part of our In-Orbit Services (IoS) division, we are looking for a Ground Software Engineer to design, develop, validate, and integrate software solutions supporting satellite ground segments and operations.
You will contribute to the development and improvement of Flight Dynamics Systems (FDS), Guidance, Navigation and Control (GNC) applications, and test tools used throughout the entire satellite lifecycle, from development and validation to in-orbit operations.
Software Design & Development
Design, develop, test, and maintain ground software applications supporting LEO, GEO, rendezvous, and in-orbit servicing missions.
Develop solutions for satellite monitoring and control, including Flight Dynamics Systems (FDS) and GNC-related applications.
Implement reliable, scalable, and maintainable software architectures.
Ensure compliance with project requirements and applicable space industry standards.
Requirements Management & Traceability
Contribute to the definition and refinement of software requirements alongside system architects and engineers.
Ensure bidirectional traceability between requirements, implementation, and validation activities.
Maintain consistency between software deliverables and system needs.
Support configuration management and software quality processes.
Verification, Validation & Qualification
Design and execute automated testing campaigns.
Support software qualification and acceptance activities.
Integrate and validate software solutions within SWIL and HIL environments.
Investigate issues, analyze root causes, and implement corrective actions.
Software Architecture & Performance
Optimize software performance, reliability, and maintainability.
Design modular and reusable software components.
Apply software engineering best practices and the KISS principle to reduce complexity.
Document architecture decisions and ensure long-term maintainability of developed solutions.
Collaboration & Engineering Excellence
Work closely with System, Avionics, AIT, and GNC teams.
Participate in technical reviews such as SRR, PDR, CDR, and TRR.
Produce and maintain software specifications, test reports, user manuals, and developer documentation.
Contribute to continuous improvement initiatives and engineering best practices.
About You
Required Experience
Degree in Software Engineering, Computer Science, Aerospace Engineering, or a related field.
Experience in software development, preferably within aerospace, space, robotics, defense, or other high-reliability industries.
Strong interest in satellite operations, flight dynamics, guidance, navigation and control, or mission-critical systems.
Experience working on complex software systems throughout the full development lifecycle.
Familiarity with software verification, validation, and integration activities.
Experience in the space industry is a strong plus.
Technical Skills
Strong programming skills in C/C++.
Experience with Python for automation, testing, and engineering tools.
Knowledge of software architecture principles and modular software design.
Familiarity with RTOS environments, low-level software, and drivers.
Understanding of software development standards such as DO-178C, ECSS, IEEE, or MISRA.
Experience with software development and debugging tools.
Knowledge of software testing methodologies and automation frameworks.
Familiarity with Agile development methodologies and systems engineering principles.
Ability to understand and analyze complex technical systems.
Soft Skills
Strong analytical and problem-solving mindset.
Excellent organizational and prioritization skills.
Ability to work autonomously while collaborating within multidisciplinary teams.
Clear written and verbal communication.
Curiosity, adaptability, and continuous learning mindset.
Ability to work in a fast-paced and multicultural environment.
Professional proficiency in English.
Why Join Exotrail?
Joining Exotrail means contributing to ambitious missions that are redefining space logistics and satellite operations.
You will work on cutting-edge technologies supporting future space missions while collaborating with passionate experts in a fast-growing international company at the forefront of the New Space industry.
What We Offer
Company health insurance with 70% covered by Exotrail
50% reimbursement of public transportation costs
Up to 2 days of remote work per week, depending on the position
Enhanced maternity and paternity leave coverage with no seniority requirement
Learning and development opportunities
Well-being benefits including Moka Care, dedicated conferences, and our ExoCare Program for Moments That Matter
35 days of paid leave per year (Annual Leave & RTT)
Working Environment
Offices located in the heart of Toulouse
Modern industrial facilities in Massy
Free coffee, tea, and fresh fruit available on site
International and multicultural teams
Dynamic and rapidly growing space company
Quality of Life at Work
Team events and afterworks
On-site osteopathy sessions on both sites
Collaborative and supportive work culture
Recruitment Process
Our recruitment process is designed to be efficient while giving you the opportunity to meet the key stakeholders involved in the role:
HR Interview with our Talent Acquisition team to discuss your background, motivations, and career aspirations.
Hiring Manager Interview to explore your experience, skills, and fit with the team and projects.
Technical Interview with our experts to assess your technical expertise and problem-solving approach.
Final Interview to discuss the role, expectations, and answer any remaining questions.
We strive to provide feedback throughout the process and ensure a positive candidate experience.
We look forward to getting to know you and exploring how you can contribute to Exotrail's mission.