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

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.

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.

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 full-stack web applications, dashboards, APIs, data pipelines, and integrations supporting military modeling and simulation exercises. Build operator-facing tools for scenario management, exercise control, assessment, and after-action reviews. Use Palantir Foundry and related technologies to enable data federation and machine-to-machine exchanges. Troubleshoot application and interoperability issues, collaborate with operational stakeholders, and apply AI/ML to improve automation and decision support in classified environments.

Own major fullstack product features from design through launch using TypeScript, React, REST, GraphQL, SQL, and BigQuery. Lead complex, high-impact projects, influence technical direction, collaborate with product and customer teams, optimize dashboard performance, deliver scalable software, document systems, and mentor engineers.

Develop, test, maintain, and support secure, scalable full-stack .NET applications in an Agile/Scrum environment. Responsibilities include API and database development, technical documentation, code and design reviews, SDLC compliance, security and audit adherence, collaboration with architects and business partners, mentoring junior engineers, leading project delivery, and participating in on-call support and occasional travel.

Build and polish complex interactive video-editing features for Studio, including transitions, color grading, element libraries, presets, and customizable keyboard shortcuts. Own frontend-leaning full-stack work from proposal through launch, collaborate in a fast-moving startup environment, and contribute to product decisions and marketing efforts. Deep backend expertise is not required.

Build and operate full-stack healthcare products across frontend, backend, event-driven workflows, data services, integrations, and AI-powered features. Partner with Product and clinical, sales, and operations stakeholders to define problems, ship solutions, measure outcomes, and iterate. Own system design, reliability, security, observability, testing, incident response, and production quality, particularly for patient data, clinical logic, billing, and LLM functionality.

Leads technical direction for a product engineering pod while remaining hands-on across frontend and backend development. Responsibilities include architecture, system design, AI-powered features, AI coding-agent practices, reliability, security, observability, integrations, incident response, roadmap prioritization, and mentoring. The role partners with product, clinical, sales, and operations stakeholders to deliver healthcare software handling protected health information.

Own the assessment, architecture, integration, testing, deployment, and stabilization of a humanitarian virtual support hotline. Connect Telegram-based patient communication, administrative and professional portals, and the organization’s website into a reliable workflow. Develop analytics and feedback capabilities, ensure accurate data sharing and onboarding, resolve integration issues, and provide post-launch support while independently making and explaining technical decisions.

Build and maintain payments infrastructure, including usage tracking, pricing, billing, payment providers, and stream-processing services. Collaborate with Finance, Tax, Growth, Sales, and engineering teams to support compliance, reporting, experiments, and customer payments. Plan migrations, debug complex production billing issues, and safely evolve live systems handling money. Requires Python expertise, backend development experience, software and system design knowledge, testing and security fundamentals, and strong problem-solving ability.

Build and operate core platform systems for users, workspaces, permissions, APIs, authentication, and resource management. Deliver full-stack features with a backend focus, including admin and settings interfaces. Scope work within large existing systems, plan migrations, manage safe rollouts, debug production issues, and collaborate across product and engineering teams. Candidates need strong Python and backend development expertise, software and system design knowledge, testing and security fundamentals, and the ability to navigate ambiguity.

Build and scale full-stack applications for maternal healthcare using React and Python. Develop AI-assisted workflows, improve care-team efficiency, maintain production reliability with Datadog, and ensure HIPAA-compliant handling of protected health information. Collaborate with product, clinical, data, and operations teams to translate complex healthcare workflows into practical solutions while establishing strong standards for code quality, testing, and deployment automation.