Senior Backend Software Engineer

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About the role

The Role: Due to team growth, we are seeking an experienced Software Engineer to join our Sat OS team, which develops the high-level operating system and file transfer layer for the spacecraft The successful candidate will play a crucial role in developing software for our satellite systems, contributing to the expansion and enhancement of our space and ground-based data transfer capabilities. Ideal candidates will embrace the commercialization of nanosatellite systems and adapt to low-cost, fast-paced systems design, development, and implementation methodologies that set Spire apart from our competition. In this fast-paced environment, the design to launch cycle is measured in weeks and months, not years! What You’ll Do as a Sat OS Software Engineer: • Develop and enhance satellite-side applications with a focus on file transfer to and from the satellite and its payloads • Contribute to the design and implementation of the next generation of Spire’s File Transfer architecture (Rust) • Ensure that Spire’s file transfer services meet internal and mission-driven security standards • Enhance observability and fault-tolerance of Spire’s file transfer services • Take responsibility for the performance of critical file transfer services that contribute to the movement of data to and from Spire’s entire fleet of nanosatellites • Contribute to the design and implementation of highly available, fault-tolerant systems to meet the demands of new customer missions • Perform ground-based testing and in-orbit verification of new software services • Coordinate closely with Spire’s communications team, systems engineering, product owners, and internal customers to ensure alignment and optimal integration with interfacing hardware and software services • Create and maintain comprehensive documentation for APIs and system architectures • Implement observability solutions for space and ground-based services to provide a clear and actionable view of service performance Basic Skills/Qualifications: • 5+ years’ experience in professional software development • Proven experience in production-grade software development using at least one compiled language • Proficiency in Python or equivalent high-level language • Knowledge of Linux-based development • Excellent documentation, collaboration, and communication skills • Systems-level thinking (distributed, scalable, highly available) with an appetite for creating and adapting applications • Hands-on experience with Cloud Computing Platforms (AWS), IaC and modern CI/CD pipelines • Knowledge of version control systems Preferred Skills/Qualifications: • Proficiency in Python and Rust • Experience working under regulatory frameworks such as NIST and FAR • Familiarity with cybersecurity principles and platforms such as Wiz • Experience with operating a live, highly available critical system at scale • Experience writing applications between L3 and L7 networking layers and familiarity with L2/L3 protocols • Experience with modern AI development tooling • Proficiency in scripting languages like Bash This role is primarily backend and platform focused. We are generally looking for engineers with stronger backend and systems experience rather than heavily frontend-focused backgrounds. Spire operates a hybrid work model, and this position will require you to work a minimum of three days per week in the office. Access to US export-controlled software and/or technology may be required for this role. If needed, Spire will arrange the necessary licenses—this is not something candidates need to have before applying. #LI-MK1 The anticipated base salary range for this position is listed below. Final base salary for this role will be based on the location, skills, experience and qualificati

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