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

Develop and deliver production-grade full-stack software across .NET/C# backend services and React front-end applications. Build reliable, scalable AWS cloud solutions, work with relational and document databases, implement CQRS, and use AI-assisted coding tools and agent-driven workflows. Validate AI-generated code for security, quality, and maintainability; collaborate with Product and QA; participate in code reviews; embed compliance and security; and mentor engineers.

Build and launch user-facing, backend-leaning full-stack products for a clinical AI platform. Design reusable accessible frontend components, develop backend features, collaborate with product managers and subject matter experts, protect patient privacy through secure coding, improve engineering practices, and support applications in production.

Design, build, and maintain production-grade .NET web applications and APIs on Azure. Own full-stack delivery from data models and SQL to front-end components, CI/CD, testing, and architecture. Collaborate with product and delivery teams, participate in code reviews, and ensure secure, observable, well-tested services.

Own full-stack delivery for a federal modernization initiative. Analyze complex legacy workflows, identify mission-critical functionality, and translate requirements into scalable applications on the Palantir platform. Build backend services, APIs, integrations, and user-facing components; support the full software development lifecycle; troubleshoot across application and data layers; and collaborate with technical and non-technical stakeholders in an Agile environment.

Designs and develops full-stack web applications using React, TypeScript, Vue, and UI-focused backend services. Builds REST or GraphQL APIs, BFF architectures, cloud infrastructure, databases, authentication, and caching solutions. Leads performance, accessibility, security, testing, CI/CD, observability, and reliability initiatives. Provides technical leadership through code reviews, architecture decisions, mentoring, refactoring, and cross-team collaboration.

Build scalable full-stack enterprise applications for federal healthcare clients using React, Node.js, REST APIs, microservices, and NoSQL data stores. Design user-focused architectures, develop reusable components, support test-driven development, prototype solutions, optimize accessibility and performance, collaborate across agile teams, explain technical solutions to stakeholders, and mentor team members. The role requires eligibility for a U.S. Federal Position of Trust clearance and extensive modern web development experience.

Develop scalable full-stack web applications using React, TypeScript, Next.js or Vite.js, Node.js, and NestJS. Build APIs, integrate databases, third-party services, and blockchain technologies, and create responsive user interfaces. Collaborate with product, design, and engineering teams while optimizing performance, participating in code reviews, testing, troubleshooting, and continuous improvement. The role also involves Web3 wallet and smart contract integrations, technical discussions, and working effectively with distributed teams.

Develop and maintain Java full-stack microservice applications for a government customer. Responsibilities include designing backend and frontend capabilities, building RESTful services, integrating Kafka messaging, managing relational databases, developing Vue.js interfaces, supporting cloud and virtualized deployments, resolving production issues, and participating in Agile ceremonies. The engineer will also provide technical guidance, support end users, and help deliver secure, distributed enterprise systems.

Build and ship end-to-end product features across an author analytics dashboard, marketing site, free tools, billing, email, and AI-assisted functionality. Design data models and APIs, integrate third-party services, develop production LLM features, and maintain testing, monitoring, performance, and observability. The role includes code review, technical documentation, independent product decisions, and close collaboration with the founder in a remote-first environment.

Build and maintain Django-based web applications, design RESTful APIs, implement frontend features (HTML/CSS/JS), optimize performance and security, collaborate with cross-functional teams throughout the development lifecycle.

Design, build, and maintain AI-powered B2B SaaS products across frontend, backend, and AI. Own projects end-to-end, collaborate with product and design, ensure maintainability, mentor teammates, and inform roadmap and implementation decisions.

The Senior Fullstack Software Engineer will design, implement, and maintain features for Conveyor's SaaS platform, involving both backend and frontend work, while collaborating closely with team members and mentoring juniors.

Develop and maintain Java applications, RESTful services, and Angular frontends using Spring Boot and NgRx. Deploy applications to cloud platforms, practice TDD, manage CI/CD with Jenkins, and work with Oracle and PostgreSQL databases. Participate in agile processes, collaborate with cross-functional teams, mentor engineers, and independently lead technical initiatives and feature delivery.

Design, develop, test, deploy, and maintain scalable full-stack applications across front-end, back-end, APIs, and data integrations. Lead feature delivery from architecture through deployment, partner with Platform and DevOps teams on CI/CD and observability, resolve complex technical issues, contribute to Agile Scrum processes, influence architecture, maintain documentation, and mentor less experienced engineers.

Build and own a space-based AI marketplace from MVP to scale, including the storefront, partner portal, admin tools, APIs, onboarding, entitlements, metering, integrations, deployment workflows, and third-party connectors. The role requires end-to-end full-stack development, cloud-native infrastructure, testing, CI/CD, monitoring, secure multi-tenant authorization, and collaboration with engineering teams. The founding developer will ship weekly on a small team and use AI-assisted development workflows.

Design, implement, and optimize full-stack solutions. Collaborate with cross-functional teams, participate in code reviews, analyze and improve system performance, and stay current with industry technologies.

Join as an early founding full-stack engineer to architect, build, and deploy a scalable platform serving AI-driven voice applications. You will own frontend and backend development, design infrastructure with the CTO, and deliver reliable production systems for enterprise customers.

Work across frontend and backend to design, build, and ship annotation and review features; implement ingestion, storage, user management, and annotation pipelines; integrate model inference into workflows; optimize performance for large images/videos; design APIs and collaborate with product, operations, and annotators.

Design, implement, and maintain scalable serverless backend services and responsive Next.js front-end components. Build data scrapers and integrations, improve CI/CD and IaC, mentor junior engineers, and collaborate with product and clients to solve complex compliance problems.

Join as the founding full-stack engineer to extend a TypeScript React/Next.js prototype, design product features, integrate AI/OCR, write tests and infrastructure, talk to users, and iterate quickly to drive growth.

Build and own Eve's marketing site and GTM engineering stack: integrate and optimize external tools, design AI agents for sales and marketing, implement webhooks and middleware to sync product/CRM data, and create programmatic campaigns and internal tools in partnership with Marketing, Sales, RevOps, and Product to drive growth and automation.

Lead frontend-leaning full-stack implementation work for carrier and enterprise integrations: architect reusable UI and API layers, author RFCs, guide technical delivery, enforce testing and security best practices, and partner with cross-functional teams to scope and ship production integrations.

Modernize a large fintech platform by building NestJS services and Next.js UIs, migrate transactional data to relational schemas, write comprehensive tests, identify and fix legacy problems, design scalable solutions that coexist with legacy systems, and use AI tooling responsibly to increase engineering velocity.

The Full Stack Engineer will design, build, and maintain scalable web applications, impact customer onboarding and integrations, write and review code, and support technical improvements.

Develop and maintain scalable full-stack applications using Java Spring Boot and React. Build REST APIs, integrate warehouse and logistics systems, and work with Apache Kafka event streams. Support legacy application modernization, distributed systems, microservices, relational databases, production troubleshooting, performance improvements, testing, code reviews, and cross-functional technical collaboration.