Top Full-Stack Engineer Jobs in Denver & Boulder, CO

The Full-Stack Engineer will build and maintain applications, own features end-to-end, contribute to system design, and collaborate closely with product and design teams while improving system reliability and performance.

Build and grow Homebot applications, services, and APIs end-to-end. Use AI tooling to rapidly deliver features, create AI-driven workflows, and ship maintainable, well-tested, scalable code. Collaborate with product, design, and engineering, and instrument systems with monitoring, logging, tracing, and analytics.

Lead design, build, and deploy full-stack software for DoD/IC missions. Rapidly prototype MVPs, integrate systems and APIs, deliver high-performance frontends, collaborate with users, and deploy/test in secure operational environments.

The Full Stack Engineer will develop features for a dynamic web application, collaborate with team members, enhance performance, and improve automated tests.

Design and build agent-powered mission consoles, collaborate with stakeholders to improve user workflows, and maintain agentic workflows for mission outcomes.

As a Senior Software Engineer, you will design and build a cutting-edge identity search platform and implement AI systems for defense applications, working closely with cross-functional teams to enhance user workflows and support national security.

Design, scope, and implement scalable full‑stack ecommerce solutions. Improve platform performance and usability, collaborate with Product and Design, run experiments, ship features, and ensure seamless integration across the product ecosystem.

As a Fullstack Engineer, you'll design, build, and operate web applications, collaborating with product teams and mentoring peers while ensuring best practices in coding and system architecture.

Responsible for leading a team of engineers, supporting product development, identifying technical issues, and ensuring high-quality code delivery in backend systems at scale.

The role involves leading application performance improvements across multiple platforms, focusing on measurable metrics and driving engineering standards and workflow optimization, using both hands-on coding and strategic influence.

Lead design and implementation of the PSA Liquidity Platform connecting buyers and sellers. Build buyer tooling, matching/ranking engines, and seller experiences. Architect and operate microservices and Kafka-driven systems on Kubernetes/AWS, instrument observability, apply AI tooling across the SDLC, and drive cross-functional delivery from 0-to-1 while owning end-to-end outcomes.

Build and maintain scalable data pipelines, Snowflake schemas, and ETL/ELT processes; develop and expose data via RESTful APIs; deliver Node.js backend services on AWS; build Vue/Vuetify front-ends; ensure data quality, reliability, and integration with financial systems.

Lead design, development, testing, and delivery of production full‑stack software (.NET/C# backend, Angular frontend). Build cloud‑native AWS solutions, implement CQRS and event‑sourced architectures using MongoDB and OpenSearch, leverage AI-assisted coding tools and agent-driven workflows, ensure security and quality, collaborate with Product/QA, and mentor engineers.

Design, build, and maintain full-stack applications to modernize DHS ICE legacy systems. Analyze legacy workflows, translate mission-critical behavior into scalable designs, implement backend services and APIs, develop front-end components, support SDLC activities, troubleshoot across stacks, and collaborate with stakeholders while upholding engineering best practices.

The Senior Full-Stack Engineer will manage client relationships, design integration solutions, and ensure seamless delivery and optimization of technical workflows, while leveraging AI for efficiency.

Design, develop, and maintain front-end and back-end components of containerized microservices for defense/intelligence applications. Collaborate on APIs or message-bus architectures, use CI/CD and Agile practices, and operate in a distributed team environment while meeting security requirements.

Seeking a Full Stack Engineer to develop and scale the platform using React and Python. Responsibilities include building frontend applications, developing APIs, managing workflows, and optimizing databases.

Develop and maintain web applications using Angular and NestJS/PHP. Manage MySQL databases and contribute to API design. Engage in client interactions and project planning while ensuring code quality and adhering to best practices.

The Senior Software Engineer will design, develop, and optimize scalable PHP APIs and web applications, collaborating with product and design teams to support product development and implement best coding practices.

Design, build, and ship full-stack features for Guardian's monitoring platform, ensuring production reliability and code quality.

Build and maintain full web application lifecycle: design responsive front-ends, implement back-end APIs, manage databases, write tests, automate CI/CD deployments, and collaborate with designers and product managers.

As a Fullstack Software Engineer, you'll design, develop, and maintain scalable frontend and backend systems while collaborating across teams.

The role involves developing and sustaining a mission-critical command and control system using React.js and TypeScript, optimizing frontend performance, and mentoring junior engineers in an Agile environment.

Seeking a Senior Full Stack Developer focused on backend architecture to design, maintain, and mentor within an Agile environment, utilizing Java and .NET.

Work on front-to-back web products in small teams, delivering well-defined features in six-week cycles. Build and improve user-facing apps (CAD, contractor/utility portals, website) using a modern web stack, collaborate with designers and senior engineers, and own features end-to-end with mentorship and in-person collaboration.