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80 principal engineer software development jobs at 39 companies in Thornton, CO

3mo
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Principal Software Engineer
Denver, Colorado, United States
$225k-$270k/yr HybridFull Time
FusionAuth
FusionAuth: Provides authentication and user management software for developers.
12+ YOEBachelor's in CS or equivalent; 12+ years software engineering; 5+ years in identity/security; hands-on leadership; strong Java; CIAM expertise.
Java, PostgreSQL, MySQL, OAuth, OpenID Connect, SAML, SCIM
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1w
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Senior or Principal Software Development Engineer - Agent Factory
Boulder or Toronto or Vancouver
$156k-$264k/yr HybridFull Time
Workday
WorkdayNASDAQ: WDAY: Provides cloud-based software for financial and human capital management.
8+ YOESenior role requires 8+ years or principal role 12+ years in software development. Requires cloud SaaS, distributed systems, DevOps, CI/CD, testing, observability, Docker, Kubernetes, communication, and a bachelor's degree or equivalent.
AWS, DevOps, CI/CD, Docker, Kubernetes, Elasticsearch, Java, TypeScript
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3mo
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Principal Software Engineer
Denver, Colorado, United States
$190k-$245k/yr OnsiteFull Time
Performance Drone Works
Performance Drone Works: Manufacturer of autonomous, tactical unmanned aerial systems for defense.
10+ YOEExpert-level C++ development; architect large-scale cross-platform systems; lead engineering initiatives; strong communication.
C++, Qt, REST, JSON, QML, QtWidgets, Git, CMake, QMake
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2w
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Principal Engineer – Software Development
Boulder, Colorado, United States
$75k-$232k/yr OnsiteFull Time
Microchip Technology
Microchip TechnologyNasdaq: MCHP: Manufacturer of microcontrollers, analog, and mixed-signal integrated circuits.
10+ YOEBachelor's degree with 10+ years or master's degree with 7–8 years of relevant experience; proficiency in C, C#, Python, SQL; test instrumentation, circuits, signal analysis, and U.S. export eligibility required.
C#, C, Python, SQL, LabVIEW
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2w
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Engineer Principal – Ground/Application Software
Aurora, Colorado, United States
$118k-$201k/yr OnsiteFull Time
BAE Systems
BAE SystemsLondon Stock Exchange: BA: Designs and manufactures advanced defense and aerospace systems.
Bachelor's degree in engineering or related technical field plus 6+ years' experience; active TS/SCI clearance, U.S. citizenship, object-oriented design, software lifecycle, UML, and listed development technologies required.
CI/CD, C, C++, Rust, Python, Ruby, AWS, AWS Lambda, Docker, Kubernetes, Spring, Jersey, Flask, CherryPy, Ruby on Rails, JavaScript, Angular, React, JavaFX, Qt, SQL, NoSQL, JPA/ORM, UML, Azure, MQTT, AMQP, Kafka, Vue, Nginx, Apache, Postgres, MATLAB, Cameo, PlantUML, DevSecOps, gtest, ctest, Agile
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1w
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Engineer Principal – Embedded Software
Boulder or Westminster or Broomfield
$118k-$201k/yr OnsiteFull Time
BAE Systems
BAE SystemsLondon Stock Exchange: BA: Designs and manufactures advanced defense and aerospace systems.
6+ YOEBachelor’s degree in engineering or related technical field plus 6+ years’ experience, or equivalent. Requires TS/SCI eligibility, embedded software expertise, and experience with C/C++, Rust, Python, Linux, testing, and software lifecycle practices.
CI/CD, C/C++, Rust, Python, Ruby, Embedded Linux, MQTT, ZeroMQ, PetaLinux, Yocto, UML, Protobuf, FlatBuffers, MATLAB, Cameo, PlantUML, DevSecOps, OpenEmbedded, gtest, ctest, Scrum, Agile
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2w
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Principal Engineer – Software
Englewood, Colorado, United States
$169k/yr OnsiteFull Time
EchoStar
EchoStarNasdaq: SATS: Global provider of satellite solutions and wireless communications services.
5+ YOEBachelor's degree in computer science, engineering, or related field and 5 years of experience required. Requires data engineering, database, SQL, Python, Linux shell scripting, AWS, Control-M, and reporting tool experience.
Amazon Redshift, Snowflake, Oracle, Microsoft SQL Server, Teradata, SQL, Python, Linux, Control-M, Amazon Web Services (AWS), Orbit Analytics, Tableau
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1w
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Principal Software Engineer
Huntsville or Atlanta or Fort Worth or Denver
$160k-$200k/yr OnsiteFull Time
Lynx Software Technologies
Lynx Software Technologies: Provides secure, safety-certified software for aerospace and defense.
8+ YOEBachelor's degree in STEM, 8+ years embedded software development, C/C++, integration and test, full lifecycle development, Linux and Windows, communication skills, and active Secret clearance.
C, C++, Linux, Windows, Confluence, JIRA, Bitbucket, Python, Cameo, AADL, DO-178C
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1mo
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Principal Software Engineer, Developer Platforms
Boulder, Colorado, United States
$220k-$297k/yr RemoteFull Time
Cisco
CiscoNASDAQ: CSCO: Develops and sells networking hardware and cybersecurity software.
8+ YOE8+ years software engineering experience, 3+ years in developer platforms/CI/CD or related, experience with automated testing, release pipelines, distributed systems, and a bachelor’s degree or equivalent.
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1mo
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Principal Software Engineer
Lone Tree or Plano or Englewood
$165k-$227k/yr HybridFull Time
Sierra Nevada Corporation
Sierra Nevada Corporation: Develops mission-critical aerospace and national security technology systems.
14+ YOEBachelor's in CS or related (Master's preferred), 14+ years software development experience, expert in C++, Java, or Python, extensive leadership experience, active Secret clearance required with ability to obtain Top Secret/TS-SCI.
C++, Java, Python, C, C#, HTML, Bash, RTOS, Open Mission System, Universal Command and Control Interface, Agile, Scrum, Waterfall, Spiral
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1mo
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Principal Software Developer(hybrid)
Redwood City or Santa Clara or Austin or Seattle or Nashville or Broomfield
$94k-$224k/yr HybridFull Time
Oracle
OracleNYSE: ORCL: Provides cloud infrastructure and enterprise software for global businesses.
7+ YOE7+ years software development experience with object-oriented languages; strong CS fundamentals, distributed systems and microservice experience, problem-solving and communication skills.
Java, C++, C#, Javascript, Go
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3mo
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Sr. Principal Cyber Software Engineer
Annapolis Junction or San Antonio or Aurora or Carey
$149k-$235k/yr OnsiteFull Time
Northrop Grumman
Northrop GrummanNYSE: NOC: Develops and manufactures advanced aerospace, defense, and space systems.
8+ YOEBachelor's degree in computer science, information systems, or network engineering with 8+ years experience; strong C/C++, Java, Python; CNO tools; Windows/.NET and Unix/Linux development.
C, C++, Java, Perl, Python, Visual Studio, NET, Unix/Linux, Makefiles
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5d
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Principal, Software Engineer
New York or California or Illinois or Atlanta or Boston or Chicago or Denver or Los Angeles or New York or Salt Lake City or San Diego
$122k-$165k/yr RemoteFull Time
DEPT
DEPT: Global digital agency providing integrated technology and marketing services.
7+ YOERequires 7+ years software experience, 3+ years Python, expert backend and distributed systems knowledge, cloud and Docker experience, API integration, databases, frontend architecture, CI/CD, and technical leadership.
Python, Gemini CLI, Claude Code, Codex, Angular, TypeScript, Google Cloud, AWS, Azure, Docker, Git, Mercurial, Agile, CI/CD, Google's Agent Development Kit (ADK), SQL, NoSQL, LLM
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3mo
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Principal Cyber Software Engineer
Annapolis Junction or San Diego or Aurora or Raleigh or San Antonio
$120k-$188k/yr OnsiteFull Time
Northrop Grumman
Northrop GrummanNYSE: NOC: Designs and manufactures advanced aerospace and defense systems.
0+ YOERequires active TS/SCI with polygraph, Bachelor's (4 yrs)/Masters (2 yrs)/PhD (0 yrs) in CS/IS/Network Engineering, experience with Python or C/C++, troubleshooting and debugging, and software development across Windows/UNIX/embedded environments.
Assembly, C, C++, Java, Perl, Python, Microsoft Visual Studio, Microsoft .NET, UNIX, make
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1mo
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Principal Software Engineer (Onsite)
Aurora, Colorado, United States
$108k-$205k/yr OnsiteFull Time
RTX
RTXNYSE: RTX: RTX provides advanced aerospace and defense systems and services.
8+ YOEActive TS/SCI clearance, U.S. citizenship, typically 8+ years software engineering experience (or 5+ with advanced degree), experience leading Agile teams, proficiency with AWS and modern microservice/DevSecOps practices.
AWS, Ruby, SDS, SEAM, Agile, SAFe, LeSS, Scrum@Scale
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4w
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Principal Software Engineer (Contract)
United States or Arlington or Denver or Merritt Island
RemoteContract
Airbus U.S. Space & Defense
Airbus U.S. Space & DefenseEuronext Paris: AIR: Provides satellite, helicopter, and cybersecurity solutions for U.S. defense.
15+ YOEBachelor's in STEM (masters preferred). 15+ years' experience (12+ with masters) in space/embedded flight software. US citizenship, ability to obtain government clearance, proficiency in C/C++, embedded development, real-time systems, GNC and HIL testing.
C/C++, GNC, BSP, Hardware in the Loop (HIL)
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2mo
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Principal Software Engineer
Boulder or Austin
$180k-$220k/yr OnsiteFull Time
Atom Computing: Building scalable quantum computers using arrays of neutral atoms.
10+ YOE10+ years engineering experience, Bachelor's in CS/CE, proven architecture leadership, proficiency with Python and SQL, Linux experience, familiarity with Git and automated testing, and willingness to learn atomic/optical/quantum concepts.
Python, Rust, TypeScript, React, SQL, Linux, Git, Terraform, Azure, AWS, GCP
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1mo
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Principal / Sr Principal Algorithms Software Engineer
Boulder, Colorado, United States
$155k-$180k/yr OnsiteFull Time
Auria
Auria: Engineering and software solutions for space and defense missions.
5+ YOEActive in-scope U.S. Government Secret clearance required, ability to obtain TS/SCI, 5+ years relevant experience for principal roles (8+ for Sr Principal), Python and C++ development, Linux and command-line utilities, algorithm and state estimation experience, strong statistics and analysis skills, willingness to travel up to 10%.
Python, C++, Linux, grep, awk, cat, head
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3mo
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Principal Engineer Software - Storage (Chronosphere)
Burbank or Denver or Chicago or Austin or Jacksonville or Hartford or Bridgeport or Seattle or Boston or New York City
$147k-$238k/yr RemoteAll Commitments Available
Palo Alto Networks
Palo Alto NetworksNASDAQ: PANW: Provides enterprise-grade network, cloud, and endpoint security software.
Design and build scalable backend services for high-volume telemetry data; strong backend skills; cloud infra experience; API design; mentorship.
Go, Java, Python, Rust, AWS, GCP, Azure, REST, gRPC, GraphQL
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2w
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Sr. Principal Software Engineer
Louisville or Centennial
OnsiteFull Time
Sierra Space
Sierra Space: Develops spacecraft and infrastructure for orbital and space transportation
15+ YOEBachelor's degree or equivalent experience, 15+ years of related experience, advanced software architecture expertise, leadership skills, Agile/Scrum experience, and ability to obtain and maintain a Secret U.S. security clearance.
Git, Python, C++, Bash, PowerShell, Perl, Ansible, Puppet, Chef, Terraform, JIRA, Confluence, Jenkins, GitHub, GitLab, Bitbucket, MySQL, PostgreSQL, MongoDB, AWS, Azure, Google Cloud, Docker, Kubernetes, SysML, UML
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