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17 software engineering intern jobs at 9 companies in Longmont, CO

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Founding Full-stack / Product Engineer
Cupertino, CA, US
$130k-$300k/yr On-SiteFull Time
HiringCafe
HiringCafe: Building a 100× better job search engine to take on Indeed and LinkedIn.
Help us build a 100× better job search engine. We need a full-stack engineer with great taste, sharp fundamentals, and a track record of shipping polished product on React/Next.js plus a real backend (Firebase, Elasticsearch, Redis, Stripe).
React, Next.js, TypeScript, Firebase, Elasticsearch, Redis, Stripe
Help us #BeatIndeed & #BeatLinkedIn
2mo
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AI Engineering Intern
Boulder, Colorado, United States
$17-$25/hr OnsiteFull Time, Internship
TIFIN
TIFIN: AI platform for personalized wealth management and investment advice.
Pursuing or recently completed BS/MS in CS, engineering or related; strong Python; familiarity with machine learning/AI, APIs, and backend development via internships, coursework or research.
Python
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14h
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Summer 2027 - Software Engineering Internship
Colorado Springs or Irvine or Longmont or Fremont or Rochester or San Jose
$35-$46/hr OnsiteInternship
Western Digital
Western DigitalNASDAQ: WDC: Design and manufacture data storage devices and systems.
Currently pursuing a Bachelor's or Master's in a technical field, experience with one or more programming languages (C,C++,Python,Java,Go,SQL,JavaScript), strong problem-solving and communication skills.
C, C++, Python, Java, Go (Golang), SQL, JavaScript, Microsoft Office, Git, Linux, IDEs
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5d
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2027 North America Software Engineering Internship
Bellevue or Boulder or Denver or Irvine or New York or Seattle
$46-$62/yr HybridInternship
The Trade Desk
The Trade DeskNASDAQ: TTD: Cloud-based programmatic advertising platform for data-driven media buying.
Enrolled in a Bachelor's or Master's program, expected to graduate 2027–2028; fluent in one or more object-oriented languages; strong data structures and algorithms; available to work 3 days in office (Tue–Thu).
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2mo
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Software Engineer, Infrastructure/Developer Tooling (Hybrid)
Toronto or Denver
$109k-$128k/yr HybridFull Time
Homebase
Homebase: Provides scheduling, payroll, and HR software for hourly teams.
3+ YOE3+ years of software or infrastructure engineering; experience with internal tooling, cloud (AWS) and CI/CD; frontend/backend versatility; strong developer experience focus.
Ruby, Golang, Terraform, AWS, CI/CD, Observability, Infrastructure as Code, Containerization
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2mo
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Mission Operation Intern Fall 2026
Littleton or Long Beach
$25/hr OnsiteInternship
Rocket Lab
Rocket LabNasdaq: RKLB: Operates launch vehicles and manufactures satellites for space missions.
0.25+ YOEEnrolled in bachelor’s, master’s, or doctoral program in aerospace/aeronautical/mechanical/software engineering; 3+ months engineering experience; GPA 3.0+; proficient in Python, Linux, Git.
Python, Linux, Git
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1mo
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Advisory Linux Systems Software Engineer
Boulder, Colorado, United States
$93k-$100k/yr HybridFull Time
Ricoh
RicohTokyo Stock Exchange: 7752: Provides digital workplace services, imaging equipment, and IT solutions.
5+ YOE5+ years developing low-level Linux systems software; strong C/C++; Python/Bash scripting; deep Linux internals, system bring-up, debugging, and hardware/software integration; bachelor's degree in CS/CE/EE or related.
Linux, C, C++, Python, Bash, GitLab, JIRA, Claude Code
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1mo
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Expert CNO Software Engineer
Hanover or Aurora
$142k-$236k/yr OnsiteFull Time
ManTech
ManTech: Provides technology solutions for defense and intelligence agencies.
20+ YOERequires TS/SCI w/ polygraph, 20+ years technical experience (BS +20 or HS +24), expertise in Python and C/C++, low-level system internals, TCP/IP, debugging, and developing CNO capabilities.
Python, C/C++, assembly, JIRA, Confluence, Crucible, TCP/IP
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1d
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Graduate Intern - LLM Reliability and Uncertainty for AI Science Assistants
Golden or United States
$45k-$71k/yr HybridFull Time
National Laboratory of the Rockies
National Laboratory of the Rockies: Conducts applied research in energy systems and technology innovation.
Graduate-level intern with GPA≥3.0, enrolled or recent graduate status, familiarity with LLMs, uncertainty quantification, Python on HPC/multi-GPU, strong software engineering and research skills.
Python, HPC, LLM
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1mo
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Expert CNO Software Engineer
Hanover or Aurora
$142k-$236k/yr OnsiteFull Time
ManTech
ManTech: Provides technology solutions for defense and intelligence agencies.
20+ YOERequires 20+ years technical experience with BS (or 24+ years with HS), active TS/SCI w/ polygraph, Python or C/C++ experience, low-level system internals, TCP/IP/socket programming, debugging, and development of CNO capabilities.
Python, C, C++, assembly, JIRA, Confluence, Crucible, TCP/IP, Windows, Unix
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1mo
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Expert CNO Software Engineer
Hanover or Aurora
$142k-$236k/yr OnsiteFull Time
ManTech
ManTech: Provides technology solutions for defense and intelligence agencies.
20+ YOETS/SCI w/ Poly required; 20+ years technical experience (or HS + 24 yrs); expertise in Python or C/C++, low-level system internals, TCP/IP, socket programming, CNO capability development, debugging, and technical leadership.
Python, C, C++, Assembly, JIRA, Confluence, Crucible, TCP/IP
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2w
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Senior CNO Software Engineer
Hanover or Aurora
$142k-$236k/yr OnsiteFull Time
ManTech
ManTech: Provides technology solutions for defense and intelligence agencies.
14+ YOEActive TS/SCI w/ Polygraph required. BS in technical discipline +14 yrs (or HS +18 yrs). Experience with Python or C/C++, low-level system internals, socket/TCP/IP programming, troubleshooting, and developing CNO capabilities.
Python, C, C++, Assembly, Windows, Unix, JIRA, Confluence, Crucible
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1mo
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Expert CNO Software Engineer
Hanover or Aurora
$142k-$236k/yr OnsiteFull Time
ManTech
ManTech: Provides technology solutions for defense and intelligence agencies.
20+ YOERequires 20+ years technical experience (BS) or 24+ years (HS); expertise in Python or C/C++, low-level system internals, TCP/IP/socket programming, debugging, and developing CNO capabilities; active TS/SCI w/ polygraph clearance.
Python, C, C++, Assembly, TCP/IP, JIRA, Confluence, Crucible
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1mo
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Expert CNO Software Engineer
Hanover or Aurora
$142k-$236k/yr OnsiteFull Time
ManTech
ManTech: Provides technology solutions for defense and intelligence agencies.
20+ YOETS/SCI w/ Poly clearance required. BS+20 years or HS+24 years technical experience. Proficiency in Python or C/C++, low-level system internals, TCP/IP and socket programming, debugging, CNO capability development, and technical leadership.
Python, C, C++, Assembly, TCP/IP, JIRA, Confluence, Crucible
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3mo
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Water Resources Engineer, Entry Level - WR0020
Greenwood Village, Colorado, United States
$72k-$85k/yr OnsiteFull Time
Felsburg Holt & Ullevig
Felsburg Holt & Ullevig: Provides transportation planning and civil engineering consulting services.
0+ YOEBachelor’s in civil engineering; 0-2 years experience; AutoCAD/Civil3D/Bentley OpenRoads; hydrology/hydraulics software; Engineering Intern Certification required.
AutoCAD, Civil 3D, Bentley OpenRoads Designer, HEC-HMS, HEC-RAS, CUHP, FlowMaster, SewerGems, EPA SWMM
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2w
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Associate CNO Developer
Hanover or Aurora
$77k-$128k/yr OnsiteFull Time
ManTech
ManTech: Provides technology solutions for defense and intelligence agencies.
4+ YOEBS in technical discipline or HS + 4 years technical experience; experience in Python or C/C++; troubleshooting and debugging; TS/SCI with polygraph required; networking, low-level internals, and reverse engineering preferred.
Python, C, C++, JIRA, Confluence, Crucible
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1mo
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CNO Developer
Hanover or Aurora
$115k-$190k/yr OnsiteFull Time
ManTech
ManTech: Provides technology solutions for defense and intelligence agencies.
2+ YOEBS+4, MS+2, or HS+8 years technical experience; experience with Python or C/C++; troubleshooting and debugging skills; TS/SCI with polygraph required; experience with networking, low-level internals, and reverse engineering preferred.
Python, C, C++, TCP/IP, JIRA, Confluence, Crucible
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1mo
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CNO Developer
Hanover or Aurora
$115k-$190k/yr OnsiteFull Time
ManTech
ManTech: Provides technology solutions for defense and intelligence agencies.
2+ YOEBS+4yrs or MS+2yrs or HS+8yrs; experience with Python or C/C++; troubleshooting and debugging; networking, low-level system internals, reverse engineering and Atlassian tools preferred; active TS/SCI w/Poly required.
Python, C, C++, TCP/IP, JIRA, Confluence, Crucible, Assembly
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