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133 sr security software engineer jobs at 67 companies in Lakewood, CO

2w
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Sr. Software Engineer
Denver, Colorado, United States
$95k-$135k/yr HybridFull Time
Vertafore
VertaforeNYSE: ROP: Provides cloud-based software solutions for the insurance industry.
5+ YOERequires 5–7 years of C# and ASP.NET experience, advanced MS SQL skills, enterprise software design, security practices, automated testing, CI/CD pipelines, AI development tools, and mentoring experience.
C#, ASP.NET, MS SQL, GitHub Copilot, Claude, ChatGPT, xUnit, NUnit, Selenium, Playwright, GitLab, TDD, BDD, CI/CD, LLM
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3mo
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Sr Software Engineer, Ground Software
Centennial or Louisville
$157k-$215k/yr OnsiteFull Time
Sierra Space
Sierra Space: Develops spacecraft and infrastructure for orbital and space transportation
8+ YOEBachelor's degree or equivalent, 8+ years experience, multiple programming languages, design/architect complex software, Agile/Scrum, leadership, security clearance eligibility.
Python, React, Git, GitHub, GitLab, Bitbucket, FastAPI, Kubernetes, Helm, ArgoCD, JIRA, Confluence, Bash, PowerShell, Ansible, Docker, AWS, MySQL, PostgreSQL, MongoDB
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3mo
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Senior Software Security Engineer
Golden, Colorado, United States
$130k-$180k/yr OnsiteFull Time
Loft Federal
Loft Federal: Provides rapid orbital access for national security space missions.
5+ YOE5+ years in software development; 3+ years in security-focused roles; strong knowledge of DevSecOps, Zero Trust, container security; secure SDLC practices; scripting (Python, Bash, C++); Linux hardening; IaC; CI/CD security; security certifications.
Python, Bash, C++, Linux, IaC, Terraform, Helm, Ansible, SAST, DAST, SCA, SBOM, SonarQube
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2d
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Sr Embedded Software Developer
Denver or Littleton
$182k-$254k/yr OnsiteFull Time
Blue Origin: Develops reusable rockets and systems for human spaceflight.
8+ YOEBachelor's degree in a relevant engineering or computer science field, 8+ years of embedded software experience, C/C++, RTOS, hardware interfaces, debugging, secure boot, and Zero Trust knowledge.
C, C++, Real-Time Operating System (RTOS), SPI, I2C, UART, PCIe, FPGA, JTAG, NIST SP 800-207, Zero Trust Architecture (ZTA), Secure Boot, NIST SP 800-53, Risk Management Framework (RMF), HAIPE, TACLANE, KG-series, FIPS 140-2, FIPS 140-3, TPM, HSM, PUF, PKI
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3w
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Sr. Software Engineer (Contract)
Arlington or Denver or Houston or Merritt Island or United States
RemoteContract
Airbus U.S. Space & Defense
Airbus U.S. Space & DefenseEuronext Paris: AIR: Provides satellite, helicopter, and cybersecurity solutions for U.S. defense.
8+ YOEBachelor's in STEM (Masters preferred). 8 years' experience (6 with Masters) designing and developing embedded/aerospace software. Proficiency in C/C++. US citizenship and ability to obtain government security clearance required.
C, C++
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3w
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Senior Software Engineer, Identity Security (Golang)
Denver, Colorado, United States
OnsiteFull Time
Apple
AppleNASDAQ: AAPL: Designs and sells consumer electronics, software, and online services.
Deep technical expertise in security and identity for cloud workloads, large-scale operations experience, and strong software engineering skills.
Golang
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1mo
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Sr Full Stack Software Developer
Denver or Sterling
$82k-$172k/yr OnsiteFull Time
CACI International
CACI InternationalNYSE: CACI: Provides information technology and engineering services for government agencies.
5+ YOEActive TS/SCI clearance with polygraph preferred, 5+ years software development, proficiency in Java and JavaScript, Linux experience, willingness to obtain Security+; Bachelor's in CS or accredited bootcamp required.
Java, JavaScript, Linux, Kubernetes, Elasticsearch, Java Spring Boot framework, AWS, WebSocket's, RESTful API
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1mo
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Sr Full Stack Software Developer
Denver or Sterling
$82k-$172k/yr OnsiteFull Time
CACI
CACINYSE: CACI: Provides information technology and professional services to government clients.
5+ YOEActive TS/SCI clearance (polygraph preferred), 5+ years software development, proficiency in Java and JavaScript, Linux experience, bachelor's in CS or coding bootcamp, Security+ (or willingness), cloud and microservice experience.
Java, JavaScript, Linux, Kubernetes, Elasticsearch, Spring Boot, AWS, WebSocket, RESTful API
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2mo
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Senior Software Engineer
Littleton, Colorado, United States
$120k-$150k/yr OnsiteFull Time
OASYS
OASYS: Provides technology services and products for government and defense.
Full-time Senior Software Engineer with C/C++ experience; US citizen; security clearance required.
C, C++
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2d
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Software Engineer Stf - E4
Littleton, Colorado, United States
$136k-$252k/yr OnsiteFull Time
Lockheed Martin
Lockheed MartinNYSE: LMT: Designs and manufactures advanced aerospace, defense, and security systems.
Embedded software engineer with C/C++, Python, Agile Scrum, software team leadership, and active TS security clearance experience. Must design, integrate, test, and guide complex software development.
C, C++, Python, Linux, Agile, Agile Scrum, Object-Oriented Design, embedded systems, MPSoC
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2mo
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Senior Software Engineer
Denver or Salem
$130k-$150k/yr OnsiteFull Time
AutoStore
AutoStoreOslo Stock Exchange: AUTO: Robotic cube storage systems for automated warehouse fulfillment.
5+ YOE5+ years in software development; Bachelor’s or Master’s in CS/Engineering; strong API, security, and data tooling experience.
Git, OpenAPI, OAuth, RabbitMQ, Apache Kafka, Azure Service Bus, Event Hubs, Azure Databricks, TypeScript, C#, F#, PostgreSQL
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4w
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Senior Software Engineer — PingOne Platform Administration & Security
United States or Denver
$110k-$138k/yr RemoteFull Time
Ping Identity
Ping Identity: Provides identity and access management software for enterprise security.
5+ YOE5+ years software engineering experience with backend services; Java and NodeJS experience; TypeScript and REST API familiarity; experience with SaaS, CI/CD, distributed systems, and mentoring peers.
Java, NodeJS, TypeScript, REST APIs, CI/CD, MCP
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4d
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Sr Principal Real-time Software Engineer
Aurora, Colorado, United States
$132k-$252k/yr OnsiteFull Time
RTX
RTXNYSE: RTX: Provides advanced aerospace and defense systems and services.
10+ YOESTEM degree and 10+ years relevant experience required, including embedded C++ or security or architecture experience, RTOS expertise, hardware-firmware-software integration, and active Secret clearance.
C++, Real-Time Operating System (RTOS), Green Hills, Integrity, Wind River VxWorks, Linux, VHDL, Verilog, Microsoft Excel
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2mo
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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 Software Engineer- DevOps
Littleton or Denver
$151k-$205k/yr OnsiteFull Time
Four Sea Group
Four Sea Group: Technical mission support and software engineering for aerospace.
6+ YOEBachelor’s degree or equivalent practical experience; 6+ years in software, DevOps, cloud, or platform engineering; active Top Secret clearance; cloud, containers, CI/CD, Linux, automation, networking, and security experience.
AWS, Azure, Google Cloud, Docker, Kubernetes, OpenShift, GitLab CI, Jenkins, Linux, Angular, React, Java, Amazon Web Services, Ansible, Puppet, Terraform, CloudFormation, GitLab, Argo CD, Prometheus, Grafana, OpenTelemetry, ELK Stack, ESXL, SAFe
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2d
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Senior Software Engineer
Portland or North Dakota or Montana or Maine or Ohio or Nebraska or Phoenix or Louisiana or Texas or Nevada or Georgia or Tampa or Mississippi or Colorado or Denver or Wyoming or Wisconsin or West Virginia or Vermont or Richardson or Arkansas or Dallas or South Dakota or Pennsylvania or Michigan or Indiana or Idaho or Arizona or Plano or New Mexico or New Hampshire or Kentucky or Alabama or Philadelphia or South Carolina or Austin or Illinois or Atlanta or Missouri or Iowa or Tennessee or Boulder or North Carolina or Minnesota or Kansas or Houston or Alaska or Chicago or Rhode Island or Washington or Virginia or Utah or Oregon or Florida or Miami or Oklahoma
$139k-$204k/yr RemoteFull Time
Cisco
CiscoNASDAQ: CSCO: Develops and sells networking hardware and cybersecurity software.
5+ YOEBachelor's degree with 5+ years, master's with 3+ years, or PhD with 1+ year; production software development, testing, troubleshooting, code reviews, technical design, scalability, reliability, and security experience.
AI/ML, generative AI, LLMs, AI agents
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2w
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Software Engineer III
Lone Tree or Englewood
$108k-$149k/yr HybridFull Time
Sierra Nevada Corporation
Sierra Nevada Corporation: Develops mission-critical aerospace and national security technology systems.
6+ YOEBachelor's in CS or related,6+ years software development,proficiency in C# or Java,experience with Linux/RHEL and Windows services,hardware integration experience,ability to obtain U.S. Secret security clearance.
C#, Java, Linux (RHEL), Windows services, C, C++, HTML, Python, Bash
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2w
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Senior Software Engineer, Radar
Broomfield or Fort Collins
$190k-$252k/yr OnsiteFull Time
Anduril Industries
Anduril Industries: Defense technology building autonomous military hardware and software.
5+ YOE5+ years software development experience; proficiency in C++; experience with Nix/NixOS, API design, reproducible builds, and software quality/security practices; Bachelor's in CS/CE or related.
C++, Python, Nix, NixOS, Lattice OS, gRPC, Protobuf, ZeroMQ, DDS, Docker, Linux
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1mo
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Staff Software Developer
Boulder, Colorado, United States
$128k-$229k/yr OnsiteFull Time
General Atomics
General Atomics: Designs and manufactures unmanned aircraft and nuclear technology systems.
7+ YOERequires advanced software development experience (C++, Linux, multithreading, TCP/UDP sockets), 7+ years' experience (varies by degree), ability to obtain DoD security clearance, and strong communication and testing skills.
C++, TCP, UDP, Linux, GitLab, Git, Bash, Python, ZYNQ Ultrascale, Xilinx SDK, PetaLinux, SPI, I2C, UART, Ethernet, Unit Testing Tools
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2mo
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Product Security Engineer
San Francisco or Denver or New York
$180k-$258k/yr HybridFull Time
Candid Health
Candid Health: Automates medical billing and revenue cycle management for healthcare providers.
5+ YOE5+ years in software or security engineering focusing on product security; strong cloud and web security knowledge; collaboration and problem solving.
SAST, DAST, SCA, CI/CD, Cloud Platforms, Kubernetes, Python, Go, Java, JavaScript
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