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

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.

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.

Build and scale consumer-facing mobile and web applications and backend services. Own features end-to-end across frontend and backend, optimize databases and queries, integrate third-party APIs, implement algorithms for risk and transaction evaluation, improve reliability and CI/CD, and contribute to testing, monitoring, and internal tools to support customer operations.

Senior fullstack engineer to build and scale Brigit's consumer finance platform. Own end-to-end features across frontend (React/React Native/TypeScript) and backend (Java/REST/SQL), optimize database and APIs for high scale, integrate 3rd-party services, implement risk and transaction algorithms, improve CI/CD, testing, monitoring, and internal tooling to support millions of users.

Build and maintain frontend and backend platform components for AI infrastructure using Python and TypeScript. Support and develop the open-source SDK, create APIs and UIs, collaborate with engineering and AI teams, write tests, and follow CI best practices. Participate in code reviews, mentorship, and continuous learning to improve platform scalability and developer experience.

Design and implement full‑stack, low‑latency web-based Ground Control Station and C2 systems (map-centric UIs, real-time telemetry, video streaming), lead architecture and APIs, mentor engineers, support field tests and mission deployments, and ensure interoperability with C2 standards.

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.

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.

Build and maintain scalable React/Node/TypeScript web applications, design RESTful APIs and microservices, optimize performance, troubleshoot full-stack issues, collaborate on features, adopt AI-assisted tools, and support CI/CD and cloud integrations.

As a Full Stack Engineer, you'll develop secure features, integrate data pipelines, design APIs, and collaborate closely with teams to enhance healthcare technology.

The Full Stack Developer will develop and deliver web applications, integrate APIs, and work with both front-end and back-end technologies. The role demands strong problem-solving skills and the ability to work under tight deadlines with minimal supervision.

The Full Stack Engineer will develop and maintain front-end and back-end components of the application, ensuring performance and integration. Collaboration with cross-functional teams is essential to translate concepts into user-friendly solutions.

The Full Stack Engineer will build cloud-based applications, collaborate with teams, and utilize AWS technologies to deliver solutions.

The Jr. Full Stack Developer supports application modernization by designing and developing web-based applications using React and Spring Boot in an Agile environment, ensuring quality and efficient coding processes while collaborating with teams and documenting solutions.

Build, test, and maintain scalable web applications using Node.js and TypeScript. Design and optimize PostgreSQL databases and SQL queries. Integrate third-party APIs (REST, GraphQL, webhooks). Implement frontend components with React or similar, use Git for version control, troubleshoot issues, and collaborate with cross-functional teams. Support CI/CD and containerization (Docker) and deploy to cloud platforms (AWS, Fly.io).

Design, build, and maintain Shopify POS applications and custom UI extensions. Integrate POS frontends with server-side logic and third-party services, test on POS hardware, troubleshoot live retail issues, and maintain observability, security, and CI/CD practices while collaborating with product and client teams.

Full-Stack Engineers at CapTech design and develop enterprise systems, collaborate with clients, and mentor peers while utilizing up-to-date technologies.

The Full Stack Engineer will design, implement, and deliver full-stack features, focusing on scalable APIs and cloud-native solutions while collaborating with clients and engineering teams.

As a Full Stack Engineer, you will build AI-powered applications, manage client interactions, and apply best practices in MLOps and LLMOps.