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.

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 Full-Stack Engineer at Clerkie, you will develop and maintain a B2B CRM, optimizing performance across the tech stack and collaborating with various teams to ensure a seamless user experience.

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.

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.

Drive feature development and architectural decisions across frontend and backend systems, mentor junior engineers, identify tech debt, and collaborate across departments.

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

The Software Engineer will design, maintain, and develop web solutions, focusing on real-time data and integrating geospatial data for front-end and back-end applications. Requires ownership of the software lifecycle, using modern frameworks and tools.

The Full-Stack Software Engineer will enhance user interfaces, APIs, and develop features for AI applications while collaborating with teams and ensuring code quality.

As a Senior Full-Stack and Platform Software Engineer at mabl, you will develop features for an AI-powered test automation platform, enhancing user experiences, designing APIs, and optimizing data pipelines while collaborating with cross-functional teams.

The Senior Fullstack Engineer will build and manage enterprise authentication systems, improve user session management, ensure security compliance, and support internal API usage across services, while enhancing performance and reliability.

The Senior Full Stack Engineer will develop and maintain features for Engrain's products, integrate AI tools, mentor junior staff, and support DevOps practices.

The Full-Stack Developer will optimize web applications using Next.js and React, handle server-side logic with Vercel, and manage Postgres SQL databases in a remote, agile environment.

The Fullstack Developer will create and maintain scalable web applications using React and Node.js, design APIs, and optimize PostgreSQL databases while collaborating with teams and ensuring code quality.

The Full Stack Engineer will design, implement, and improve shared platform capabilities, collaborating to ensure high-quality, reliable software solutions while experimenting with modern technologies.

Lead development of an AI-enabled Ethereum Layer 2 platform: build front-end and back-end systems, deploy and optimize AI models, create data pipelines, collaborate on model training, and contribute to product innovation and other company projects.

Design, build, test, and maintain full-stack web applications using JavaScript/TypeScript (React or Angular, Node.js). Create RESTful APIs, implement responsive and accessible UIs, work with relational/NoSQL databases, contribute to CI/CD and GitHub workflows, and mentor junior engineers in an Agile environment.

Lead customer-facing architecture and development of scalable, cloud-native AWS applications. Drive design discussions, migrate monoliths to microservices, implement serverless and container solutions, advise on AWS best practices, and influence developer-focused product and platform strategy.

Lead technical engagements to architect and build scalable, cloud-native AWS applications using serverless, containers, and microservices. Migrate monoliths to microservices, advise on AWS best practices, influence infrastructure and product strategy, and work directly with customers and cross-functional teams.

As a Staff Backend Engineer, you'll develop new product experiences, lead technical capability investments, and mentor engineers in backend development.

Build and maintain end-to-end product features across frontend, backend, and databases. Design APIs, authentication, data models, integrations, and AI-assisted workflows. Ship production-ready SaaS components, debug across the stack, improve reliability and performance, and collaborate on product and architecture decisions in an early-stage startup.

Design and build the Command & Control frontend and full-stack features for large heterogeneous UAV swarms. Develop distributed, real-time infrastructure tolerant of intermittent communications, implement UI concepts for telemetry, sensors, scheduling and data links, own features end-to-end, and maintain strong CI/CD, QA, and DevSecOps practices.

Support and debug .NET applications (2–4 years experience). Analyze application logs and perform troubleshooting in a clean room/customer R&D lab. Candidate will attend a client interview as part of external hiring.

The Fullstack Engineer will develop and enhance a VA patient portal using Ruby and React, focusing on user experience, performance, and security, while collaborating with a cross-functional team in a remote setting.