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

Lead technical strategy and execution for Affirm’s account management team, building secure, scalable fullstack systems and customer account security experiences. Collaborate with product, design, analytics, and engineering teams; establish quality, monitoring, testing, and operational standards; support availability and on-call practices; communicate technical decisions; and mentor engineers.

Leads full-stack software teams developing, integrating, deploying, and maintaining mission-critical applications for DoD and intelligence customers. Builds prototypes and user-focused features, integrates systems and APIs, collaborates with military and government operators, and conducts deployment, field testing, and triage in secure environments. Requires expertise in React, TypeScript, Python, high-performance interfaces, secure software deployment, customer engagement, and national security missions.

Develop and maintain a full-stack web application and platform for fraud analysis. Build APIs and user interfaces, write automated tests, troubleshoot production issues, collaborate with product, design, data science, infrastructure, and solutions engineering teams, and participate in on-call support. Use React, Golang, Python, PostgreSQL, Docker, and AWS technologies to deliver reliable products and meet service-level requirements.

Develop and maintain a fraud-analysis web application and platform. Build APIs and user interfaces, write automated tests, troubleshoot production issues, collaborate with product and cross-functional teams, analyze product metrics, and support SLA compliance through production on-call rotation.

Build and maintain fullstack features for GitLab’s post-purchase subscription lifecycle, including renewals, billing accounts, auto-renewal, overages, reconciliations, and subscription visibility. Partner with Product and Design, integrate billing and customer systems, write reliable tested code, support safe rollouts and monitoring, participate in code reviews and incident response, and reduce technical debt and architectural risk.

Develop and maintain full-stack data analytics applications, interactive dashboards, visualization tools, backend services, RESTful APIs, and database integrations. Integrate data sources, analytical models, and processing services into secure, scalable user-facing applications. Collaborate with data scientists, engineers, analysts, and government stakeholders while supporting testing, troubleshooting, performance optimization, CI/CD, and deployment activities.

Develop and sustain full-stack data analytics applications for a U.S. Government platform. Build responsive user interfaces, dashboards, visualizations, RESTful APIs, microservices, database integrations, and analytical capabilities. Collaborate with data scientists, engineers, analysts, and government stakeholders to deliver secure, scalable software. Support agile development, troubleshooting, performance optimization, testing, CI/CD, deployment, and platform integration.

Build and maintain scalable backend platforms for capital orchestration, transaction reconciliation, collateral movement, data pipelines, and business workflows. Collaborate with engineers, product managers, designers, analysts, and business stakeholders to design systems, write tested code, improve reliability, and deliver projects incrementally. Support production operations through monitoring, metrics, debugging, code reviews, and on-call responsibilities.

Staff Software Engineer responsible for technical strategy, scalable full-stack systems, team operations, reliability, monitoring, code quality, and talent development. The role involves building customer-facing card experiences and backend services using Python or Kotlin, AWS, MySQL, Spark, Kubernetes, and React-based frameworks. The engineer will own features end to end, collaborate cross-functionally, manage technical risks and trade-offs, support on-call health, and apply AI safely to improve development and customer experiences.

Build and ship custom full-stack programs for AI labs and product teams, including capture flows, task logic, data pipelines, validation, redaction, provenance, and delivery across web, mobile, and backend systems. Partner directly with technical customers to scope ambiguous requirements, determine what to reuse or build, ship production code, establish data quality processes, and turn repeatable custom solutions into core platform capabilities.

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.

Develop and deliver full-stack features using .NET Core, C#, React or Angular, REST APIs, and MySQL. Write unit and integration tests, troubleshoot issues, optimize performance, and improve system reliability. Collaborate with technical and product teams, participate in code reviews, and independently own features from implementation through delivery. The role requires strong communication in English and supports remote work from Latin America.

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.

Develop and maintain full-stack web applications, including responsive front-end interfaces, back-end services, RESTful APIs, microservices, and database solutions. Collaborate with product and design teams, participate in the software development lifecycle, optimize application performance and security, troubleshoot issues, and support testing and deployment. The role requires modern web technologies, strong problem-solving abilities, and effective teamwork in a remote-first agile environment.

Develop and deploy scalable full-stack healthcare applications using Go, TypeScript, Angular, and AWS. Responsibilities include technical design, coding, automated unit/integration/end-to-end testing, code reviews, troubleshooting, agile ceremonies, mentorship, architecture improvements, and occasional on-call support. The role contributes technical leadership across frontend and backend systems while collaborating with Scrum teams and cross-functional partners.

Design, develop, test, deploy, and support scalable cloud-native applications using Java, Spring Boot, React, TypeScript, and Node.js. Build REST APIs, microservices, PostgreSQL data models, integrations, CI/CD pipelines, and containerized deployments. Improve application reliability, observability, security, performance, and scalability while troubleshooting production issues. Collaborate with Product, UX, QA, DevOps, Architecture, and engineering teams through design sessions, code reviews, planning, and client-facing workshops.

Architect, develop, and maintain full-stack software for a fintech and proptech platform. Build scalable Node.js, JavaScript, and TypeScript back-end systems, APIs, PostgreSQL databases, serverless AWS applications, and infrastructure-as-code deployments. Integrate AI technologies and modern React applications while participating in the full software development lifecycle. Collaborate with product and QA teams to gather requirements, test solutions, resolve issues, and deliver reliable software in a fast-paced startup environment.

Build, scale, and maintain full-stack platform features across frontend and backend systems. Develop responsive interfaces, APIs, microservices, database schemas, and data models. Support system design, testing, CI/CD, monitoring, performance, and stability. Collaborate with product managers, designers, QA engineers, and leadership to deliver polished, scalable software experiences.