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

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.

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.

Seeking a full stack engineer to develop applications, requiring skills in Node.js, SQL, and modern JavaScript frameworks with a focus on scalability and performance.

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

Develop fullstack web applications, enhance platform performance, collaborate on high-impact opportunities, and ensure stable, scalable solutions. Engage in rapid iterations and be a committed team player.

Design and build a high-performance, AI-native web trading experience for sophisticated retail traders. Ship core trading workflows (order entry, positions, blotter, watchlists, alerts), implement trustworthy AI UI patterns, collaborate with backend engineers on low-latency contracts, and iterate quickly with users and stakeholders to deliver end-to-end product features.

Build end-to-end full-stack AI features on a Ruby on Rails backend and React frontend, design and run experiments (A/B tests and AI evaluations), implement AI infrastructure for reliable LLM inference, and iterate quickly to scale production-ready LLM-powered products.

Develop and implement full stack features for a healthcare platform, focusing on both frontend (React) and backend (Node.js) development. Responsible for performance optimization, API creation, testing, and collaboration with data engineering teams.

Join a small team to improve a tech product aimed at upskilling users in MENA, working with JavaScript and Node.js in a collaborative remote environment.

Lead and deliver software solutions, oversee full-stack architecture, mentor engineers, and drive cross-functional initiatives for spacecraft modeling and control platforms.

Build the core product interface (chat, citations, admin settings) from scratch, ship weekly to design partners, own UX decisions, establish frontend architecture and conventions, and work directly with founders to prioritize and implement features.

Build, customize, and maintain WordPress and Shopify websites; manage CRM setup and integrations (HubSpot, HighLevel); handle full-cycle website and CRM builds; optimize performance, SEO readiness, and conversions; troubleshoot issues; collaborate with stakeholders and communicate progress, blockers, and timelines.

Design, build, test, and maintain full-stack applications aligned with Microsoft Dynamics 365 CRM. Develop responsive front ends, back-end services and APIs, manage databases, troubleshoot and document solutions, work in a DevOps/Agile environment, and collaborate with product, architecture, and DBA teams while learning P&C insurance business logic.

Lead and mentor a web development team building features and site improvements in a LEMP stack. Develop front-end interfaces (HTML/CSS/JavaScript), perform database development and SQL optimization, integrate systems via JSON/XML/PHP web services, and apply website optimization, secure coding, and SEO best practices.

As a Fullstack Engineer, you will develop and enhance user experiences for members and providers at Thyme Care, collaborating with teams to deliver scalable products.

The role involves building and integrating full-stack features for an AI chat application, focusing on reliable workflows and real-time AI interactions.

Deliver and maintain data pipelines, ETL/ELT, and API-driven data products; build RESTful APIs, Node.js backend services on AWS; and develop front-end interfaces using Vue/Vuetify while ensuring data quality, reliability, and integration with financial systems.

Design and ship scalable full‑stack applications using React, Node, and TypeScript; integrate LLMs and AI services (RAG, embeddings, vector search); build supporting data/retrieval layers; measure and optimize AI feature quality, latency, and cost; collaborate with cross‑functional teams and DevOps; maintain secure, testable code and share AI/web technology best practices.

Lead design and build of an AI-native marketing platform: integrations, multi-agent orchestration, UIs, tooling, analytics, CI/CD, auth/multi-tenancy, and production AI agents to automate marketing workflows and drive adoption across teams.

Owner of end-to-end ecommerce features: design, implement, and maintain scalable backend services and performant React/Next.js frontends. Integrate payment gateways and procurement systems (PunchOut), mentor engineers, uphold code quality, and improve platform stability across Node.js, MySQL, and MongoDB.

Design, build, and maintain full-stack web and backend services for defense/intelligence customers. Develop containerized microservices, frontend applications, and backend APIs/message-bus integrations. Use CI/CD, Agile practices, monitoring and logging tools, and collaborate with distributed teams. Work requires active TS/SCI clearance and US citizenship.

Design, develop, and maintain full‑stack web applications and containerized microservices for defense and intelligence customers. Build front-end and back-end services, integrate APIs/message buses, use CI/CD, monitoring, and collaborate on distributed Agile teams to deliver mission-focused software.

Design, build, and maintain full‑stack web applications and containerized microservices for defense/intelligence users. Develop front-end and back-end services that communicate via APIs or message buses, use CI/CD and Agile practices, and operate monitoring/logging tools to support mission-critical spatial intelligence software.