Software Engineer Jobs in Colorado, United States

Sierra Space builds missions and systems that keep the world secure in the domain above Earth, safeguarding national security and sustaining human presence in space. The Software Engineer III (Flight Software) role designs, develops, and tests software applications for space systems, writing clean maintainable code, architecting complex systems, collaborating on requirements, and mentoring other engineers.

Ground Software Team at Katalyst Space Technologies builds the foundational software that enables robotic spacecraft operations and mission-critical ground procedures. The role reviews and enhances the current ground stack, creates automated tooling, mentors engineers, and drives code quality to support reliable space missions.

Sierra Space is a space and defense technology company building missions and systems that keep the world secure above Earth. The Software Engineer III/Sr/Principal, Flight Software (Contractor) role focuses on designing, developing, and testing flight software and algorithms for spacecraft missions, both civilian and DoD. Responsibilities include writing clean, maintainable code, architecting complex software systems, collaborating with team members, using Git for version control, participating

ADC Hardware & Software Team at Amazon Web Services (AWS) builds embedded software for custom FPGA SoCs and high‑assurance 400G+ networking solutions. The SDE develops Rust‑based firmware, low‑level ARM and RISC‑V drivers, Linux kernel modules, and implements cryptographic security standards, collaborating with hardware and system engineers and maintaining CI/CD test pipelines.

Rocket Lab's Space Systems Digital Engineering team in Littleton, CO develops next-generation simulation and modeling tools supporting aerospace systems, including flight and ground software. As a Senior Software Engineer I/II, you will design and maintain simulation tools, mission-level wargaming tools, and laser communication constellation network analysis products using a .NET, Angular, and relational database stack.

Sierra Space’s Ground Software team builds mission‑critical software for space systems, ensuring national security and space sustainability. The Sr. Software Engineer designs, develops, and tests complex applications, leads code reviews, mentors peers, and makes high‑level design decisions that impact program cost and schedule.

As a Software Engineer Lead within PNC's IT Site Reliability Engineering Center (SRC), you will create and lead the technical design and development of software solutions, propose designs to address complex business needs, and provide technical guidance and support to colleagues. The SRC is a 24/7 operation requiring participation in an on-call rotational support team, including resolving critical systems issues during off hours.

LG Ad Solutions seeks a Software Engineer II, Data Engineer to build and scale terabyte‑scale data pipelines for its DSP/SSP and ACR systems. The role focuses on designing, developing, and deploying robust backend services, creating platform tooling for data governance, quality, and compliance, and troubleshooting distributed data workflows.

Recurly’s Software Infrastructure team builds core application services to enable global subscription platform scaling. This role involves defining next-generation platform services and implementing features in Golang applications within a hybrid Broomfield, Colorado office.

Rocket Lab's Space Systems team in Littleton, CO is seeking a Senior Software Engineer I/II – Simulation Engineering to architect large-scale simulation environments and drive high-level data analysis for complex aerospace challenges. Day-to-day work includes designing distributed simulation campaigns, building data pipelines to process and visualize massive simulation datasets, optimizing HPC and distributed cluster infrastructure, and collaborating with domain experts to translate mission obje

Checkr is building the data platform to power safe and fair decisions, serving over 140,000 companies. As a Software Engineer, you will own product development from design to release, collaborate on architecture, and deliver performant, scalable code across small services built on Ruby and Javascript.

Space Operations directorate at Parsons develops cutting‑edge software for national security space missions. The Software Engineer builds and debugs Java backend services and Angular front‑end applications, containers Docker images, and deploys to Kubernetes on AWS, supporting the Ollivander program in a SCIF environment.

Software Engineer at RGi develops secure, scalable microservices and enterprise applications for defense and intelligence clients. Leads full-stack development, mentors engineers, and implements DevSecOps pipelines in classified cloud environments.

Delta Solutions & Strategies is seeking a Software Engineer to join its team at the Corporate Headquarters in Colorado Springs, CO, focusing on development and maintenance of software for high fidelity Missile Warning training. Day-to-day work includes integrating existing software into the Joint Live Virtual Constructive (JLVC) HLA environment using RTI-s and FOM with C++ and C#, collaborating with stakeholders, and performing agile development in unclassified and classified environments.

Software Engineering team at Toyon Research develops cutting‑edge AI/ML software solutions. Engineers design and implement Python or C++ applications, collaborate with researchers and customers, and mentor junior developers.

Radar and Sensor Technologies group at CACI develops algorithms and software for synthetic aperture radar, low observables, and electro-optical remote sensing. The Software Engineer converts algorithm prototypes into robust, scalable applications, collaborates with radar and research scientists, and participates in the full development lifecycle.

Software Test Automation Team builds automated testing frameworks to ensure complex products run reliably. The Software Engineer designs, implements, and maintains Python‑based test automation that integrates with external hardware for verification and regression testing, collaborating with cross‑functional teams to expand coverage and improve product quality.

Engineering team at Praxent builds modern full‑stack solutions for clients, delivering UI, APIs and cloud infrastructure. The Software Engineer role designs and implements features, writes clean code, collaborates in Agile sprints, and mentors junior staff.

Sierra Space’s Software Engineering team builds mission‑critical systems for space operations. The role designs, develops, and tests software for space systems, writing clean, maintainable code, collaborating on Agile teams, and ensuring high quality through code reviews and automated testing.