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

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.

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 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.

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.

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.

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.

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

Design and build responsive, accessible front-end interfaces and server-side systems. Develop features with modern frameworks, integrate APIs, database work, create UI/UX prototypes, test end-to-end, conduct code reviews, and collaborate with cross-functional teams to deliver high-quality web and mobile applications.

As a Senior WordPress Full Stack Engineer, you will maintain and extend WordPress and ReactJS platforms, implement API integrations, collaborate with designers for UI/UX, and participate in code reviews to ensure quality and scalability.

The Staff/Principal Full Stack Engineer will design and build core web applications, backend services, and integrate AI capabilities for healthcare-focused operational tools.

The Full-stack Engineer will build and own features for Hercules' AI-driven applications, including the AI Agent and App Builder, focusing on clean code, SaaS functionalities, and system design within a team-centric environment.

Design, build and maintain Microsoft Cloud applications using Power Apps/Pages and Azure services. Implement Entra ID authentication, Azure Functions/App Services, Logic Apps and Blob storage. Create Azure Data Factory pipelines and APIs (REST/GraphQL), integrate external services and LLM data pipelines, and ensure performance, security, and scalability while collaborating with customers to turn requirements into streamlined apps.

Design, implement, and maintain platform-independent device communication middleware and related applications. Build high-performance Node.js/TypeScript services, expose functionality via GraphQL/REST, standardize device interactions, collaborate with cross-functional teams, and follow CI/testing best practices to ensure reliable, maintainable cross-platform and embedded solutions.

Design, build, and operate scalable full-stack systems for an AI-native enterprise platform: backend services, APIs, frontend React apps, workflow orchestration, integrations, testing, CI/CD, monitoring, and production readiness while collaborating with product and customers.

Design, develop, and maintain high-performance web applications and WebAPIs using .NET 6 and React. Build scalable, reliable services, optimize performance, troubleshoot defects, and collaborate with product and development teams. Use Azure platform services, NoSQL/SQL databases, CI/CD pipelines, and propose continuous improvements.

Design and build backend microservices with Java and Spring Boot, create and maintain RESTful APIs, and develop Angular frontend components. Work across the full stack, integrate asynchronous patterns (Kafka) and AWS S3, collaborate with cross-functional teams, and troubleshoot/debug applications throughout the software lifecycle.

Design, develop, and maintain backend microservices in Java/Spring Boot; create RESTful APIs; build Angular frontend components; integrate asynchronous communication (Kafka) and AWS S3 storage; collaborate across the SDLC and troubleshoot full-stack issues.

Design, build, and secure scalable full‑stack applications integrating enterprise contact‑center platforms (IVR, call routing, real‑time logging) and Salesforce. Collaborate in Agile teams, implement RESTful APIs, cloud‑native and containerized architectures, apply DevSecOps and TDD practices, and ensure secure, testable, high‑quality software.

Develop and maintain web applications using Java/Spring Boot backend and Angular frontend. Build microservices and RESTful APIs, integrate frontend with backend, work with Kafka and AWS S3 as needed, and collaborate across the SDLC to troubleshoot and deliver user-focused solutions.

Design, develop, and maintain backend microservices in Java/Spring Boot; build RESTful APIs; implement Angular front-end; integrate with Kafka and AWS S3; collaborate across the SDLC; troubleshoot and debug full-stack issues. Fraud prevention experience required.

Lead consolidation and modernization of two legacy giving marketplace applications into a single scalable stack. Design and build backend services with Java, Spring Boot, and Hibernate JPA; develop responsive Angular front-end using NgRx and SCSS. Refactor legacy code, improve performance and scalability, implement features, ensure UI/UX feasibility, and perform code reviews.

Design, develop, and maintain full-stack web applications using Java/Spring Boot backends and Angular frontends. Build RESTful APIs and microservices, implement fault tolerance (Hystrix/circuit breakers), event-driven solutions with Kafka, and observability (SLI/SLO). Deploy and manage services on Kubernetes and AWS, collaborate with cross-functional teams, mentor junior developers, and ensure system reliability and performance.