# Senior Backend Software Engineer at Spire

> Develop and enhance satellite file transfer software and ground-based data services for Spire's nanosatellite fleet.

- Company: Spire (spire.com)
- Location: Boulder, Colorado, United States
- Places: Boulder, United States
- Posted: 2026-09-17
- Level: Senior
- Team: Sat OS
- Work mode: Hybrid
- Type: Full-time
- Apply: https://spire.com/careers/job-openings/job/?gh_jid=8210664&gh_jid=8210664
- Page: https://ye.saranatour.dev/jobs/senior-backend-software-engineer-spire-kn7a4yw8kyrcgtff3nnxnc4z198hc88w

## The posting

Senior Backend Software Engineer
Spire · Boulder, Colorado, United States

**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
- Experience writing applications between L3 and L7 networking layers and familiarity with L2/L3 protocols
- 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 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.

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