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

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.

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.

The Senior Full Stack Engineer develops and maintains the US Sports platform, coaches junior engineers, collaborates with stakeholders, and ensures high system performance under demand.

The Senior Full Stack Developer will build end-to-end solutions, collaborate in a remote environment, and write technical documentation. The role requires expertise in Ruby on Rails and various programming paradigms.

The Senior Full Stack Engineer will design and implement APIs with NodeJS, develop UIs with React, manage data pipelines, and deploy projects on AWS.

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.

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.

As a Senior Full Stack Developer at Capnexus, you'll design and build a cloud-native subcontractor pre-qualification platform using AWS, incorporating AI and modern frontend/backend technologies, ensuring seamless integration and deployment.

Build and own data-driven dashboards and backend services for DeFi risk analysis. Develop React frontends, GraphQL APIs, and cloud-native data pipelines. Collaborate with research and protocol teams, mentor junior engineers, drive architectural improvements to the Alert Portal, ensure code quality through testing and reviews, and identify product and technical enhancements.

Design, build, and maintain scalable web applications using Python and React. Collaborate with teams and ensure application security and performance.

Seeking a Senior Fullstack Engineer with frontend focus in React, TypeScript, and Python. Responsibilities include frontend architecture, API building, and leading frontend standards. Requires 5+ years of experience with strong team collaboration.

The Senior Full Stack Engineer will design, build, and maintain web applications, leveraging AI, managing technical debt, and enhancing feature development while collaborating with cross-functional teams.

The Senior Full Stack Engineer will develop scalable web applications using Python and React.js, mentor team members, and enhance system performance while leveraging AI technologies. The role emphasizes collaboration, end-to-end feature ownership, and architectural improvements in a remote setting.

The role involves owning the product workflow, building user-facing features, maintaining systems, and collaborating with cross-functional teams. Strong React and Typescript skills are essential.

Design, develop, and maintain scalable web applications, mentor junior developers, optimize performance, and ensure best practices in coding.

Develop and maintain the frontend using Vue.js, integrate with Django APIs, ensure application performance, and participate in code reviews for continuous improvement.

The Senior Full-Stack Developer will create software solutions jointly with clients, ensuring high-quality code and effective collaboration with the team.

Lead full-stack delivery to modernize DHS ICE legacy systems by analyzing workflows, designing scalable backend services and APIs, building React front-end components, integrating with modern platforms (Palantir), supporting the full SDLC, troubleshooting across stacks, and collaborating with stakeholders to translate mission-critical functionality into a modern architecture.

Build developer tooling, documentation, and web experiences for AT Protocol. Develop and operate backend API and identity services, maintain open-source SDKs, support auth and identity management, and ensure production hosting and developer-facing APIs work reliably for third-party builders.

Build and maintain user-facing interactive features and backend APIs. Own architecture, write well-tested code, participate in reviews and standups, ensure production reliability, and create development and deployment standards.

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.

Design, build, and maintain scalable full‑stack web applications using Python (FastAPI/Django/Flask) and Node.js frameworks (Next.js, Nest.js). Build React front ends, architect RESTful APIs, work with SQL/NoSQL databases, implement testing and security best practices, leverage AWS cloud services and AI-assisted development tools, collaborate with product and design, perform code reviews, and mentor junior engineers.