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78 software engineer junior jobs at 41 companies in Fort Collins, CO

1mo
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Software Engineer II
Lone Tree or Sparks or Longmont or Hagerstown or Herndon or Englewood
$94k-$130k/yr HybridFull Time
Sierra Nevada Corporation
Sierra Nevada Corporation: Develops mission-critical aerospace and national security technology systems.
2+ YOEBachelor's in CS or related,2+ years software development experience,proficiency in C++,Java,Python,knowledge of engineering principles,ability to work in multidisciplinary teams.
C++, Java, Python, C, C#, HTML, Bash, RTOS, AI/ML
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4d
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Software Engineer, C++
Broomfield or Fort Collins
$126k-$167k/yr OnsiteFull Time
Anduril Industries
Anduril Industries: Defense technology building autonomous military hardware and software.
2+ YOERequires 2 years of relevant experience, a bachelor's degree or equivalent, C++ and Python, mathematical foundations, software engineering fundamentals, and ability to obtain a U.S. Top Secret SCI clearance.
C++, Python, SQL, NoSQL, JavaScript, React, Node.js, MATLAB, Simulink
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3w
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Software Engineer
Colorado Springs or Irvine or Longmont or Fremont or Rochester or San Jose
$111k-$148k/yr OnsiteFull Time
Western Digital
Western DigitalNASDAQ: WDC: Design and manufacture data storage devices and systems.
0+ YOEPursuing or recent Bachelor's/Master's in a technical field; experience with C/C++, Python, Java, Go, SQL, or JavaScript through coursework or internships; familiarity with software fundamentals, debugging, and development tools.
C, C++, Python, Java, Go (Golang), SQL, JavaScript, Microsoft Office, Git, Linux, IDEs
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1mo
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Software Engineer
Westminster, Colorado, United States
$74k-$137k/yr HybridFull Time
Publicis Groupe
Publicis GroupeEuronext Paris: PUB: Global communications, advertising, and digital transformation holding.
1+ YOEBA/BS in CS, 1-3 years big-data/software development; proficient in Scala, Python, or Java; strong Apache Spark and Databricks experience preferred; AWS and modern data tooling (Kubernetes, Docker, Airflow) experience.
Scala, Python, Java, Databricks, Apache Spark, Hadoop, Hive, Kubernetes, Docker, MWAA, Airflow, AWS, Git, SQL, Delta Lake, Unity Catalog
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1mo
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Software Engineer - RFGL Systems
Washington or Boulder
$90k-$131k/yr HybridFull Time
Spire Global
Spire GlobalNYSE: SPIR: Operates satellite constellations for global tracking and weather analytics.
2+ YOE2+ years software engineering experience, hands-on AWS (EC2,S3,Lambda,ECS/EKS,CloudWatch,IAM), Python, Linux/bash, production systems reliability and monitoring, strong communication and teamwork skills.
AWS EC2, S3, Lambda, ECS, EKS, CloudWatch, IAM, Python, Linux, bash, Spark, Kafka, Databricks, Terraform, Ansible, CloudFormation, Docker, Kubernetes, GitHub Actions, Prometheus, Grafana, ELK, C++
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16h
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Software Development Engineer I
Louisville, Colorado, United States
$76k-$129k/yr OnsiteFull Time
Esri
Esri: Developing software for digital mapping and spatial data analysis.
1+ YOEBachelor's degree in Computer Science, Software Engineering, or STEM; 1+ years' software development experience; JavaScript, TypeScript, Python, React, REST APIs, HTML, CSS, and responsive design skills.
React, JavaScript, TypeScript, Python, REST APIs, HTML, CSS, Agile, Scrum, Waterfall, UML, PostgreSQL, SQL Server, Oracle, ArcGIS, ArcGIS Maps SDK for JavaScript, ArcGIS API for Python, Esri Calcite Design System
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3w
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Software Engineer - Activity & Fitness, Watch Software
Boulder, Colorado, United States
OnsiteFull Time
Apple
AppleNASDAQ: AAPL: Designs and sells consumer electronics, software, and online services.
Design and build fitness and mindfulness features, collaborate across software and hardware teams to create integrated user experiences.
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2w
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Engineer I - Software
Boulder or Broomfield or Westminster
$65k-$110k/yr OnsiteFull Time
BAE Systems
BAE SystemsLondon Stock Exchange: BA: Provides advanced defense, aerospace, and security technology solutions.
BS in engineering or related required; experience with satellite ground systems, ground-system tools, cloud, web services, and back-end/front-end languages; eligible for Top Secret/SCI clearance.
COSMOS, ECLIPSE, OS/COMET, OASIS, AWS, Lambda, Docker, Kubernetes, Spring, Jersey, Flask, CherryPy, Ruby on Rails, JavaScript, Angular, React, JavaFX, Python, Qt, SQL, NoSQL, JPA/ORM, Java, C++, Rust, Ada
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1mo
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Software Engineer II
Boulder, Colorado, United States
$100k-$130k/yr HybridFull Time
Spectra Logic
Spectra Logic: Provides scalable data storage and management solutions for long-term preservation.
2+ YOE2+ years professional development experience, proficiency in Go/C++/C/Java, bachelor’s degree or equivalent experience, strong communication and problem-solving skills.
Go, C++, C, Java, CI/CD
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2mo
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Software Systems Engineer II
Centennial or Louisville
$106k-$145k/yr OnsiteFull Time
Sierra Space
Sierra Space: Develops spacecraft and infrastructure for orbital and space transportation
2+ YOEBachelor's degree (or equivalent), 2+ years related experience, strong programming skills, software development principles, Agile experience, Git proficiency, and ability to obtain/maintain Secret U.S. security clearance; U.S. citizenship required.
DOORS, Rhapsody, NoMagic, MATLAB, Git
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2mo
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Engineer II – Ground/Application Software
Broomfield or Westminster or Boulder or Colorado or United States
$79k-$135k/yr OnsiteFull Time
BAE Systems
BAE SystemsLondon Stock Exchange: BA: Provides advanced defense, aerospace, and security technology solutions.
2+ YOEBS in engineering +2 years experience, current Secret clearance with ability to obtain TS/SCI, experience with cloud, containerization, C/C++, Rust, Python, Ruby, web frameworks, databases, UML, and formal software development practices.
CI/CD, Containerization, AWS, Lambda, Docker, Kubernetes, Spring, Jersey, Flask, CherryPy, Ruby on Rails, JavaScript, Angular, React, JavaFX, Python, Qt, C++, Java, Rust, Ruby, SQL, NoSQL, JPA/ORM, PlantUML, Cameo, MATLAB, gtest, ctest, MQTT, AMQP, Kafka, Nginx, Apache, Postgres
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3w
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Software Engineer
Browns Corner or Colorado Springs or Peterson AFB or Loveland
$85k-$142k/yr OnsiteFull Time
Serco
SercoLondon Stock Exchange: SRP: Provides professional outsourcing services to governments worldwide.
2+ YOEUS citizen able to obtain active Secret clearance, Bachelor\u0002s degree and 2 years related experience, software development in Java/C/C++, Linux/Unix/Python experience, testing/scripting, willing to travel up to 25%.
GitHub, VersionOne, SharePoint, Fortify, Linux, Unix, Python, Java, C, C++
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2w
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Flight Software Engineer
Boulder, Colorado, United States
$130k-$280k/yr OnsiteFull Time
Impulse Space
Impulse Space: Developing in-space transportation services and orbital transfer vehicles.
2+ YOEBachelor's degree required; 2+ years writing C++ for embedded systems; experience with RTOS or Embedded Linux; knowledge of computer architecture, OS, data structures, networking; version control and test practices.
C++, RTOS, Embedded Linux, NASA cFS, ROS2
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3d
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CIRES / NOAA NCEI Software Engineer Associate Scientist I
Boulder, Colorado, United States
$62k-$78k/yr HybridFull Time
University of Colorado Boulder
University of Colorado Boulder: Public research university offering undergraduate and graduate education programs.
Bachelor's degree in computer science, engineering, mathematics, physical sciences, or STEM field; programming proficiency and ability to independently write and maintain code. U.S. work authorization required.
Java, JavaScript, Bash, Linux, AWS, Crosschq
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1mo
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Software Engineer I, Model and Simulation
Broomfield, Colorado, United States
$90k-$125k/yr OnsiteFull Time
Katalyst Space Technologies
Katalyst Space Technologies: Develops robotic spacecraft for in-orbit satellite servicing and maneuvering.
1+ YOE1-3 years modeling & simulation experience, 2-3 years C++ and Python, BS in a STEM field, strong OOP and distributed systems understanding, problem-solving and attention to detail.
C++, Python, Basalisk, STK, GMAT
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3d
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2026 Intern Conversion - Software Development Engineer I
Seattle or Van Horn or Denver or Huntsville or Arlington or Los Angeles or Longmont or Reston or Florida
$101k-$155k/yr OnsiteFull Time
Blue Origin: Develops reusable rockets and systems for human spaceflight.
Completed a 2026 Blue Origin internship, enrolled in or recently graduating from college, B.S. in mechanical, aerospace, or astronautical engineering, and eligible to work under U.S. export controls.
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1mo
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Algorithms Software Engineer - Level 2
Boulder, Colorado, United States
$92k-$138k/yr OnsiteFull Time
Northrop Grumman
Northrop GrummanNYSE: NOC: Develops and manufactures advanced aerospace, defense, and space systems.
0+ YOEActive U.S. Secret clearance required; Bachelor's in STEM + 2 yrs related or Master's in STEM + 0-2 yrs. Experience in algorithm design, state estimation, numerical computing, C/C++ and Python, Linux utilities, and data analysis. Willingness to travel up to 10%.
Modern C++, C/C++, Python, Linux, grep, awk, cat, head, containerization
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4d
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Junior Applications Developer
Broomfield, Colorado, United States
HybridFull Time
Sonepar
Sonepar: Global distributor of electrical products and B2B solutions.
1+ YOEBachelor's degree in computer science, information technology, or related field; 1–2 years of full-stack development experience with .NET, ASP.NET MVC, C#, SQL Server, web technologies, APIs, and integrations.
Microsoft .NET Framework, ASP.NET MVC, C#, Visual Studio, Microsoft SQL Server, RESTful services, Web API, JavaScript, TypeScript, jQuery, JSON, HTML, CSS, XML
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2w
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Engineer II – Ground/Application Software Integration
Broomfield or Westminster or Boulder
$79k-$135k/yr OnsiteFull Time
BAE Systems
BAE SystemsLondon Stock Exchange: BA: Provides advanced defense, aerospace, and security technology solutions.
2+ YOEBS in engineering or related field plus 2+ years experience, active Secret clearance with ability to obtain TS/SCI, CI/CD and cloud experience, Python or Ruby scripting, Atlassian tools experience.
CI/CD, Containerization, Python, Ruby, Confluence, Jira, Jama, DOORS, SysML
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2w
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Jr. to Mid-level Software Engineer - Boulder, CO
Boulder, Colorado, United States
$110k-$138k/yr OnsiteFull Time
Davidson Technologies
Davidson Technologies: Delivers engineering and technology solutions for national security missions.
2+ YOEProficiency in C/C++, Python, Linux, and OOP; experience with algorithm development, state estimation, and data analysis; ability to travel up to 10%; active DoD Secret clearance required to start.
Linux, C, C++, Python, Java, Jira, Git, Conan, CMake, Nexus, Bash, grep, awk, cat, head, Confluence, Bitbucket
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