Top Senior Software Engineer Jobs in Denver & Boulder, CO

Develops, integrates, tests, maintains, and supports Java-based software systems and mathematical algorithms for Boeing’s C2BMC missile defense applications. Responsibilities include software architecture, requirements decomposition, interface development, design documentation, coding, debugging, performance optimization, agile execution, integration and testing, operational support, and technical issue resolution. The role collaborates with systems engineering, integration and test teams, and industry partners while supporting full software lifecycle activities for ballistic missile defense systems.

Lead the design and development of ETL solutions for regulatory risk compliance at PNC, requiring advanced programming skills and collaboration on data-intensive applications.

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.

Develop and test Java-based C2BMC missile defense applications across the full software development lifecycle. Responsibilities include architecture and requirements development, design artifacts, coding, reviews, integration and testing, agile execution, issue resolution, and performance optimization. The role also involves collaborating with industry partners, documenting test activities, deploying integration processes, and mentoring junior engineers. Work is fully onsite in Colorado Springs or Huntsville and requires an active U.S. Secret clearance.

Design, deploy, and optimize Philo’s distributed video streaming infrastructure, including ingest, transcoding, packaging, delivery, RESTful services, analytics pipelines, DRM, and ad insertion. Improve platform reliability, performance, latency, security, video quality, and cost efficiency. Collaborate with content partners and internal video, advertising, client, and data teams while supporting streaming quality across new platforms. The role also involves architectural ownership, cloud operations, and mentoring.

Architect and build a high-performance trading platform for active traders. Develop responsive web interfaces integrating real-time market data, low-latency execution workflows, and advanced trading tools. Collaborate with cross-functional engineering teams on large-scale initiatives, emphasizing scalability, performance, API quality, maintainability, developer experience, and end-user usability.

Design and scale foundational APIs and backend services for LogicGate’s multi-tenant GRC platform. Build distributed systems using Java/Kotlin, Spring Boot, AWS, databases, caching, and messaging technologies. Improve reliability, observability, performance, testing, and CI/CD practices. Lead technical design reviews, collaborate cross-functionally, mentor engineers, and use AI coding tools to improve development efficiency.

Set technical direction for Toast’s Developer Experience platform, including local development, build tooling, shared libraries, testing frameworks, and developer portals. The role combines hands-on software engineering with architecture, cross-team technical leadership, AI-assisted development, developer productivity measurement, mentorship, and roadmap prioritization.

Designs, develops, tests, and optimizes C++ software for RF processing, radar systems, simulations, and toolchains. Converts algorithm specifications into software, integrates experimental data and analytical tools, participates in code reviews, and collaborates with cross-functional engineering teams. The role requires containerization, numerical methods, object-oriented design, tactical mission knowledge, and active Secret clearance with the ability to obtain Top Secret/SCI clearance. Work is fully onsite five days per week.

Leads software systems engineering for SATCOM mission planning supporting military NC3 networks. Responsibilities include requirements, architecture, API and backend development, user interface implementation, integration, testing, deployment, code reviews, security, performance improvements, mentoring, and Agile DevSecOps delivery. The role requires onsite work in Colorado Springs, active U.S. Secret clearance, U.S. Person status, and up to 10% travel.

Develop and maintain scalable SaaS solutions for financial reporting and capital markets customers. Responsibilities include full-stack development, system design, testing, monitoring, performance optimization, security, technical debt reduction, and collaboration with product managers, developers, and SRE teams. The role requires building reliable, secure, maintainable data-driven applications and contributing across the software development lifecycle.

Own and expand Gusto’s third-party integrations, building reliable Ruby on Rails and Sidekiq backend services that synchronize data with partner platforms. Evaluate traditional APIs and AI agent protocols such as MCP, shape the technical roadmap, collaborate with Product, Design, and Data Science, establish engineering practices, review code, and mentor engineers. The role requires end-to-end project ownership in an ambiguous, evolving domain.

Lead architecture and engineering for a new Provider Onboarding team. Build scalable, database-backed systems and custom tools supporting pricing, payments, client panels, and forms. Establish engineering practices, mentor senior engineers, guide cross-functional delivery, and oversee the full software development lifecycle from planning through post-launch maintenance. The role requires healthcare systems experience and ownership of complex, reliable products.

Lead architecture and development for a new Provider Onboarding engineering domain. Build scalable full-stack, database-backed applications and microservices supporting pricing, payments, client panels, forms, and provider workflows. Mentor engineers, establish design patterns, drive cross-functional delivery across the full software lifecycle, and improve operational reliability for a healthcare platform.

Lead the technical direction of Samsara’s shared geospatial platform. Build scalable data ingestion and processing pipelines, map data models, spatial APIs, map-matching and routing foundations, and reusable platform capabilities. Scale storage, querying, and computation for real-time features, consolidate team-specific solutions, mentor engineers, lead cross-team technical projects, and represent the company in the geospatial community.

Build and ship full-stack web and mobile experiences across Affirm’s consumer products. Break down projects, collaborate with product, design, and analytics teams, develop scalable APIs, write well-tested code, monitor service health, participate in on-call support, review code, and contribute to engineering growth and interviewing.

Develop and support software for satellite radiometric calibration, imaging sensor commissioning, and space operations. Responsibilities include service architecture, reliability monitoring, CI/CD integration, automated testing, operational troubleshooting, cloud-based distributed systems design, and collaboration with scientists and software teams. The role supports production and test environments, investigates data anomalies, and advances calibration operations for satellite imagery and geospatial data products.

Lead fraud decisioning engineering initiatives by architecting, building, launching, and maintaining complex backend systems. Drive cross-functional projects from definition through monitoring, write high-quality and resilient code, review technical work, mentor engineers, collaborate with Product, ML, Analytics, and Business teams, and contribute to hiring and interview design.

Leads architecture and development of scalable, high-availability software systems supporting millions of endpoints. Owns complex multi-team initiatives, makes technical decisions, mentors engineers, establishes engineering standards, and improves software quality. Requires deep Java development, distributed systems, API design, database engineering, system scalability, testing, and AI-assisted development experience.

Develops, enhances, tests, debugs, and maintains front-end and back-end software for mission-critical defense radar systems. Designs GUIs, desktop and web applications, autonomous services, scripts, and utilities; collaborates with system and business analysts; resolves software issues; coordinates enhancements and bug fixes; and ensures software standards are met.

Lead the architecture, development, testing, deployment, troubleshooting, and sustainment of secure Appian applications for U.S. Army systems. Provide technical leadership, conduct code reviews, mentor developers, support integrations and cloud environments, translate requirements into workflows, participate in Agile ceremonies, and maintain technical documentation. The role requires Appian development expertise, DoD security knowledge, Secret clearance eligibility, and U.S. citizenship.

Develops, tests, releases, troubleshoots, and secures enterprise, web, responsive, and mobile applications. Designs APIs, databases, microservices, deployment pipelines, automated testing, monitoring, and cloud-based solutions within an Agile DevSecOps environment. Provides architecture guidance, mentors engineers, supports application security and performance reviews, evaluates AI-generated code, and may provide technical leadership and on-call support.

Build and operate an agentic SOC investigation platform using LLMs, including telemetry tools, investigation workflows, evidence-backed outputs, evaluation systems, and analyst productivity features. Develop secure, reliable, observable backend services that handle attacker-influenced data across customer environments. Collaborate with SOC analysts, researchers, technical leads, and product managers to translate investigative expertise into production agent behavior.

Join a small engineering team as a hands-on full stack developer. Accelerate frontend delivery, then take on backend services, infrastructure, and core capabilities. Own features from design through release and operational stability, collaborate with customer-facing engineers and founders, and promote effective AI-assisted development practices. The role requires strong backend-oriented full stack skills, product-launch experience, system design judgment, self-direction, and periodic travel to a California office.

Build and scale full-stack software supporting emergency housing, nonprofit partners, housing supply, and fundraising. Collaborate with product, design, data, and operations teams to deliver program features, break initiatives into milestones, use research and data to guide improvements, and work within large codebases. The role requires designing APIs and services, delivering reliable software incrementally, and adapting quickly to changing global needs.