Top Senior Software Engineer Jobs in Denver & Boulder, CO

Develop and analyze tracking and state-estimation algorithms for an autonomous distributed tracking system. Build prototype and analysis tools using modern C++ and Python, resolve algorithm defects, contribute to technical documentation and customer presentations, and support algorithm verification and validation. The role requires an active DoD Secret clearance and involves on-site work in Boulder, Colorado with 10% travel.

Design, develop, test, deploy, and support full-stack enterprise applications for legal operations, matter management, document management, compliance, and business automation. Build React frontends, Java and Spring Boot microservices, APIs, integrations, event-driven solutions, and cloud-native deployments. Work with databases, Docker, Kubernetes, Azure, AWS, CI/CD, monitoring, security, and production support while collaborating with legal, compliance, product, architecture, and engineering teams in an Agile environment.

Develop and architect scalable iOS applications serving millions of users. Collaborate with Product, Design, and Engineering to deliver features, promote clean architecture and iOS best practices, monitor performance and crash analytics, and guide technical excellence. Requires strong Swift, SwiftUI, MVVM, API integration, persistence, testing, and code quality expertise.

Develop and deploy scalable full-stack healthcare applications using Go, TypeScript, Angular, and AWS. Responsibilities include technical design, coding, automated unit/integration/end-to-end testing, code reviews, troubleshooting, agile ceremonies, mentorship, architecture improvements, and occasional on-call support. The role contributes technical leadership across frontend and backend systems while collaborating with Scrum teams and cross-functional partners.

Develop, test, validate, document, and maintain missile performance simulation software. Support software architecture modernization, troubleshoot complex problems, participate in Agile ceremonies, and collaborate with analysts, project managers, systems engineers, integration and test engineers, and software developers. Work may span multiple projects involving simulation tools, software products, and capability upgrades.

Design, build, deploy, and maintain resilient, scalable software for Toast Delivery Services. Develop real-time delivery tracking, driver matching, pricing, refunds, and payment-related systems. Solve distributed-systems and scaling challenges, integrate with partner APIs, uphold production reliability, promote strong engineering practices, and mentor teammates.

Develops, maintains, tests, documents, and debugs command-and-control software for the Next Gen GEO program. Works on an agile team supporting software transition into operations, resolves defects and system issues with hardware, network, and DevSecOps teams, contributes to releases and root cause analyses, and provides on-call support during evenings and overnight hours as needed.

Develops and communicates software architecture across Agile teams delivering integrated defense products and tools. Ensures software reuse, DevSecOps, automation, lifecycle processes, and engineering best practices. Coordinates software development, design, testing, debugging, integration, and documentation while resolving complex technical issues across multidisciplinary teams. Supports architecture implementation, lab integration activities, and occasional travel to Huntsville.

Own the architecture and technical direction for provider-sourced client products, including lead management, caseload migration, AI-powered inquiry workflows, and provider marketing tools. Partner cross-functionally with product, design, data, sales, customer experience, and pricing teams. Build reliable user-facing systems, guide technical decisions across teams, measure product impact through experimentation, and influence teams without direct authority.

Designs, develops, integrates, and certifies a company-wide digital test procedure application. Responsibilities include full-stack software development, requirements analysis, architecture support, implementation, testing, cross-functional collaboration, Agile development, process improvement, and enterprise application maintenance. The role works on-site at least three days per week and may involve travel between company locations.

Designs, develops, maintains, and troubleshoots scalable software applications using .NET, SQL Server, UI frameworks, and cloud technologies. Collaborates with product owners, developers, testers, and technology leads; participates in code reviews; writes documented code; and improves software development practices.

Designs, develops, tests, documents, and debugs software for mission applications on an Agile team. Applies software engineering standards throughout the development lifecycle, resolves programming and system capability issues, and supports automated testing, continuous integration, and regression testing. The role uses C#, Angular, C++, DevOps, Kubernetes, microservices, and related development tools. Technical leadership and military communications satellite experience are desirable.

Build and ship a full-stack data collection and search platform for defense and intelligence users. Develop frontend, backend, data ingestion, storage, indexing, APIs, and agentic AI capabilities using TypeScript, React, Tailwind, Node.js, PostgreSQL, and AWS. Partner with mission owners, customers, designers, and engineers to translate intelligence workflows into intuitive, mission-ready products supporting information analysis and visualization.

Designs, develops, maintains, tests, documents, and debugs Mission Management software for the FORGE Command and Control team. Works in an agile Scrum team to modernize a legacy product, coordinate interface compatibility across teams, plan user stories, and resolve technical challenges using modern architecture. Requires professional C/C++ development experience in Linux environments and supports software standards throughout the development lifecycle.

Leads and performs software integration, testing, debugging, troubleshooting, and development for complex mission systems. Designs and implements software using C/C++, Python, object-oriented design, and Agile Scrum practices. Supports requirements verification, architecture, virtual development labs, software processes, and system integration across engineering teams. Participates in scrums, sprint reviews, and technical demonstrations while ensuring software standards and lifecycle processes are met.

Leads and performs software integration, testing, debugging, troubleshooting, and development for complex mission software. Designs, implements, documents, and verifies software using object-oriented design and Agile Scrum practices. Supports virtual development labs, software processes, requirements verification, architecture, and system integration while collaborating with engineering teams and customers. Requires embedded programming experience and an active TS/SCI clearance with CI Poly.

Leads mission software integration and development activities, including requirements verification, architecture, design, implementation, testing, debugging, system troubleshooting, and documentation. Guides teams through Agile software lifecycles, applies engineering standards, integrates complex embedded systems, and collaborates with engineering disciplines and customers. The role requires embedded programming in C, C++, or Python and an active TS/SCI clearance with polygraph.

Build and maintain React-based public websites, owning features from conception through production. Develop reusable component libraries, styling, animations, content platform functionality, server-side rendering, site generation, and mobile-to-web migrations. Collaborate with product, design, and growth teams in a small cross-functional team to deliver high-quality web experiences.

Develop and own user-facing mobile features from inception through production in a cross-functional team. Write maintainable, well-tested code and help deliver a cross-platform banking application using React Native and MobX. The role contributes to a fast-moving, mobile-first consumer product and may involve native Android or iOS development.

Develop high-performance C++ simulations of space-based payload processing for missile-warning and defense programs. Translate FPGA algorithms into functionally equivalent x86/Linux implementations, model processing pipelines, validate CPU results against FPGA references, support software- and hardware-in-the-loop testing, analyze mission data, optimize computationally intensive software, troubleshoot discrepancies, and document algorithms and test results.

Develops and maintains simulation software supporting flight software integration and hardware-in-the-loop testing. Responsibilities include enhancing end-to-end test scripts, operating HWIL testbeds, diagnosing configuration and baseline issues, analyzing test results, resolving technical problems, coordinating with engineering teams, and maintaining documentation. The role requires Python and C++ development in Linux or UNIX environments, with MATLAB and Agile experience preferred.

Develops and maintains mission-focused software across the full lifecycle, including requirements analysis, software architecture and design, coding, unit testing, integration, formal testing, delivery, documentation, and debugging. Works with multidisciplinary teams and applies software standards, processes, and development tools. The role may involve C/C++, real-time operating systems, Agile development, MBSE, and software requirements engineering. A Final Secret clearance and U.S. citizenship are required.

Develops and supports ground software subsystems for aerospace and defense missions. Responsibilities include planning, designing, coding, documenting, testing, debugging, and resolving software issues within Agile and DevSecOps environments. The role applies software engineering standards, automated testing, continuous integration, deployment practices, and modern development tools while collaborating across Agile teams. Experience with web applications, microservices, containerization, cloud technologies, databases, and distributed systems is valuable.

Develop, test, debug, document, and deploy Java software for complex space and mission systems. Build cloud-based, containerized applications using Kubernetes and Docker, support CI/CD automation, troubleshoot multi-service systems, and improve Java performance and concurrency. Work within an Agile Scrum team to deliver secure, continuously deployed mission capabilities. The role requires U.S. citizenship and eligibility for a Top Secret clearance, with special-access facility requirements.

Develops and supports ground software subsystems across the full lifecycle, including design, coding, testing, debugging, documentation, integration, and site acceptance. Works within Agile and DevSecOps teams to deliver mission capabilities using software reuse, containerization, cloud technologies, microservices, automated testing, and CI/CD. Coordinates development activities, applies engineering standards, resolves software issues, and collaborates across development teams.