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

Develop and scale full-stack web applications for Toast’s digital storefront, including online ordering and website products. Design solutions, improve performance and usability, collaborate with Product and Design, run experiments, resolve critical issues, and contribute to API design, testing, and cross-team product integration.

Develop and maintain satellite command-and-control, mission-planning, mission-data processing, and data-analysis software using Elixir. Collaborate on architecture, design, and code reviews while working across engineering disciplines. The role requires functional programming, resilient and fault-tolerant distributed systems, front-end development, live-system debugging, and strong communication. Preferred experience includes Elixir OTP, React, TypeScript, OAuth2, network protocols, databases, and distributed-system monitoring.

Develop and operate CrowdStrike’s internal cloud management platform and mission-critical CI/CD pipelines. Build APIs and UIs using Go and TypeScript, improve developer productivity, integrate tooling, maintain cloud-native infrastructure, and support secure, highly available software delivery systems. Collaborate with development, infrastructure, security, and SRE teams, ensure SOC2-aware processes, and participate in on-call operations.

Provides technical leadership on complex, high-impact engineering projects from design through launch. The role involves architecture, company-wide initiatives, engineering excellence, mentoring technical leaders, and establishing standards for scalable, reliable, secure, observable systems. The engineer will collaborate across teams, communicate complex technical topics, and apply customer-focused decision-making and A/B testing techniques.

Develop and ship phased software projects for Affirm’s mobile card acquisition team. Collaborate with product, design, and analytics stakeholders; build web and mobile applications and scalable APIs; monitor operational metrics; support availability and on-call efforts; participate in code reviews, interviews, and team development.

Develop and launch scalable full-stack search systems using JavaScript, TypeScript, Python, or Kotlin. Collaborate with engineers and stakeholders, balance delivery speed with system reliability, debug code, participate in code reviews, write tested and extensible software, and contribute to team growth and communication.

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.

Build and launch scalable fullstack web applications and APIs for Affirm’s Ads Platform. Collaborate with product, design, analytics, and engineering partners to break projects into deliverable phases, make technical trade-offs, write tested and extensible code, monitor service metrics, support on-call operations, review code, and participate in team development and interviews.

Build and ship full-stack web and mobile experiences across Affirm’s consumer products. Break down projects, collaborate with product, design, and analytics teams, develop scalable APIs, write well-tested code, monitor service health, participate in on-call support, review code, and contribute to engineering growth and interviewing.

Lead design and delivery of full-stack basketball scoring, statistics, and postgame features. Build scalable backend services and APIs with TypeScript and Node.js, develop React web experiences, support iOS and Android products, and make architectural decisions. Collaborate across product, design, and engineering teams, ensure code quality and system reliability, mentor peers, and contribute to technical standards and tools.

Lead the architecture and delivery of GitLab’s data products, including near-real-time data ingestion, knowledge graph integrations, data marketplaces, observability, and data-sharing APIs. Translate ambiguous 0-to-1 initiatives into roadmaps, resolve cross-team dependencies, ensure operational readiness across deployment surfaces, and mentor engineers. The role requires deep full-stack expertise, technical leadership, and experience with AI-powered orchestration and multi-tenant SaaS systems.

Develop and support software, automation tools, dashboards, and alarms for cloud infrastructure, cost attribution, and cloud efficiency. Collaborate with cross-functional teams and senior engineers to design reliable systems, APIs, databases, tests, and AI agents. Contribute to architecture and automation strategies while maintaining strong security, communication, and delivery practices.

Develop and maintain full-stack healthcare applications using C#, .NET, ASP.NET Core, JavaScript, and SQL Server. Design APIs, services, background jobs, database procedures, and responsive interfaces; troubleshoot across application and deployment layers; write automated tests; modernize legacy systems; build secure healthcare integrations; and protect sensitive data. Collaborate with product, QA, support, and implementation teams while participating in design reviews, code reviews, testing, and release validation.

Principal Engineer responsible for architecting, building, testing, deploying, and operating full-stack TypeScript applications. The role leads React and Next.js front ends, Node.js services, APIs, cloud infrastructure, integrations, databases, CI/CD, observability, security, and AI capabilities. It owns products end to end, establishes engineering standards, partners with creative and operations teams, and provides technical leadership on client projects. Strong autonomy, communication, architecture, and production operations skills are required.

Design and develop scalable cloud applications using Node.js, microservices, Azure, and AWS. Build workflow, data integration, REST API, serverless, and event-driven solutions; integrate client applications with cloud storage; implement security, testing, CI/CD, and DevSecOps practices. Optimize performance and cost, collaborate with cross-functional teams, provide technical leadership and mentorship, conduct technology research, and communicate architecture and recommendations to stakeholders.

Build and maintain scalable full-stack applications using React and Java or Python. Develop microservices, optimize high-throughput systems, resolve architectural and performance issues, and deliver production-grade software in Agile environments. The role includes end-to-end implementation ownership, cloud development, AI-assisted engineering, and mentoring or leading developers.

Develop and maintain complex enterprise applications for the USPS. Responsibilities include architecture design, requirements analysis, Java and full-stack development, AWS deployment and DevOps, testing, production support, server patching, documentation, and mentoring junior developers. The role requires expertise in Java, Spring, REST APIs, web technologies, Kubernetes, microservices, Kafka, AWS, CI/CD, and automated testing. This is a remote position requiring the ability to obtain Public Trust clearance.

Develop and maintain scalable full-stack web applications for an advertising measurement and reporting platform. Build responsive interfaces, APIs, backend services, microservices, database integrations, and AI agent solutions. Optimize performance, scalability, reliability, and data integrity; troubleshoot complex issues; write automated tests; conduct code reviews; mentor junior engineers; and collaborate with cross-functional teams and contractors throughout the development lifecycle.

Own end-to-end development of customer-facing web platform features, emphasizing React and TypeScript frontend development while contributing to Python backend services. Translate product concepts and designs into reusable, intuitive UI components, partner with Product and Design, engage directly with users, and use AI-powered tools to accelerate development while maintaining code quality and performance.

Build and evolve Seastack’s data center optimization platform across backend services, data models, frontend interfaces, and infrastructure. Develop Python and FastAPI APIs; create React, Next.js, and TypeScript experiences; manage ClickHouse and MongoDB schemas; contribute to Azure-based DevOps, CI/CD, observability, reliability, and scalability. Collaborate with product and data science teams, lead technical reviews, translate requirements into system designs, mentor teammates, and perform code reviews.

Build enterprise workforce management software for forecasting, capacity planning, scheduling, adherence, intraday management, and reporting. Develop Java and Spring Boot microservices, React and TypeScript applications, REST APIs, event-driven workflows, integrations, and PostgreSQL data models. Support cloud-native deployments, CI/CD, testing, performance optimization, production troubleshooting, and technical design. Collaborate with product, operations research, QA, DevOps, UX, and client stakeholders.

Build and maintain scalable full-stack applications using Python, FastAPI, PostgreSQL, MongoDB, React, and TypeScript. Develop secure REST APIs, responsive interfaces, asynchronous services, and GenAI-powered features such as LLMs, AI agents, RAG, knowledge bases, and semantic search. Containerize and deploy applications with Docker and AWS while owning features through development, deployment, and monitoring.

Develop and deliver a new product within an existing Web3 and AI platform. Responsibilities include full-stack Craft CMS development with Twig, front-end JavaScript and UI implementation, Node.js development, smart contract and Web3 integration, and decentralized storage solutions. The role requires independent execution from design and briefs through completion in a remote environment. This begins as a temporary contract with potential for long-term employment.

Designs, builds, and ships scalable full-stack applications and services. Responsibilities include developing Java and Spring Boot APIs and microservices, building React interfaces, managing NoSQL data, contributing to architecture, using AI coding assistants, reviewing code, mentoring engineers, and partnering with product, design, QA, and DevOps teams.

Design, build, and ship scalable full-stack applications and services. Develop Java and Spring Boot APIs and microservices, build React interfaces, manage NoSQL data, and contribute to architecture decisions. Use AI coding assistants responsibly, participate in code reviews, mentor junior engineers, and uphold testing and documentation standards. Collaborate with product, design, QA, and DevOps teams to deliver reliable releases.