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

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.

Leads architecture, development, and maintenance of scalable full-stack public health surveillance applications. Responsibilities include Java and React development, APIs and HL7/FHIR integrations, DIBBS workflows, record linking and deduplication, CDC reporting pipelines, testing, CI/CD, DevSecOps, technical direction, code review, mentoring, and stakeholder collaboration.

Build backend-focused Java/Kotlin APIs and data-driven product features, while contributing to React dashboards and workflows. Design scalable systems, participate in architecture and code reviews, troubleshoot production issues using observability tools, and collaborate with data, reporting, design, and product teams to launch emerging products.

Develop fullstack web applications, enhance platform performance, collaborate on high-impact opportunities, and ensure stable, scalable solutions. Engage in rapid iterations and be a committed team player.

Develop and deploy customer-focused web, mobile, and backend applications across the full software stack. Design major features, contribute to architecture decisions, conduct code reviews, and ensure secure, high-quality implementations. Collaborate with stakeholders and cross-functional teams using Agile and SDLC practices. Manage version control, CI/CD, environments, and releases; maintain automated test coverage and perform root-cause analysis. Build and optimize relational data solutions using SQL Server, including complex queries, stored procedures, and performance tuning.

Build and own CRM features and workflow automations supporting sales, marketing, onboarding, and support. Develop full-stack functionality using Next.js, FastAPI, Inngest, and related technologies; partner with teams to automate workflows; create agentic solutions for enrichment and task automation; and manage features from planning through monitoring and refinement. The role requires strong web development expertise, product sense, autonomy, communication, and experience with modern JavaScript or TypeScript frameworks and orchestration tools.

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.

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.

Build and evolve Humana’s NBA Action Library and Command Center using React, TypeScript, Node.js, PostgreSQL, and Kafka. Develop accessible front-end experiences, REST APIs, data models, integrations, automated tests, and reliable state-driven workflows. Collaborate with product, design, and platform teams to deliver secure, scalable software supporting action creation, governance, versioning, preview, and publishing.

Build and maintain full-stack features for a security infrastructure platform, expand PKI, PAM, and KMS products, work directly with enterprise customers, and explore AI applications in secrets management. The role requires strong JavaScript ecosystem expertise, particularly React, Node.js, and TypeScript, with optional Go and developer tools experience. This is a primarily remote role requiring work during US hours.

Architect and develop scalable APIs, software solutions, and high-quality frontend experiences. Lead technical initiatives, define engineering standards, manage software design and code reviews, mentor engineers, and guide products from conception through deployment. Collaborate across teams to establish roadmaps, deliver customer-focused capabilities, and maintain reliable, reusable, testable code supporting sports data and analytics platforms.

Build and evolve scalable, secure full-stack platform capabilities for College Board’s assessment systems. Responsibilities include designing and implementing software, translating product needs into technical work, participating in Agile ceremonies, conducting code and design reviews, supporting production issue resolution, improving CI/CD workflows, and collaborating with product, architecture, data, and engineering partners. The role also involves mentoring teammates, influencing technical direction, and maintaining high standards for reliability, security, and maintainability.

Deploys, configures, integrates, and operates Databricks and enterprise cloud data infrastructure for HUD. Automates infrastructure through IaC, scripting, APIs, and CI/CD; configures security, identity, access, compute, storage, and Unity Catalog. Supports data pipelines and Databricks applications, troubleshoots platform and integration issues, documents procedures, collaborates with cloud, cybersecurity, DevSecOps, and application teams, and provides technical leadership.

Design, build, and optimize scalable cloud and web software with focus on infrastructure, performance, and hardware integration for IoT devices. Collaborate with hardware teams to ensure connectivity and high availability, implement new features, and improve system efficiency.

Lead architecture and implementation of scalable web applications using NestJS and Next.js. Build and optimize PostgreSQL schemas and queries, implement responsive UIs with Tailwind CSS, integrate LangChain-driven AI features, manage authentication with Clerk, and create end-to-end tests and automation with Puppeteer to ensure launch readiness and reliable user experiences.

Develop and deploy a cloud-ready PostgreSQL/PostGIS database, Python REST APIs, ETL workflows, React interfaces, dashboards, and GIS visualization tools for the USGS Volcano Hazards Program. Ensure accessibility, security compliance, documentation, testing, and interoperability across volcano observatories. Collaborate with government stakeholders, support federal certification activities, and participate in up to three onsite visits during the 12-month engagement.

Leads technical vision and strategy for Affirm’s Marketplace, Search, Ads Platform, and consumer experiences. Designs scalable full-stack platforms, guides architecture and technical excellence, coordinates initiatives across engineering teams, mentors engineers, and drives reliable delivery of customer-focused products across iOS, Android, and Web.

Designs and develops complex full-stack software systems using Java, JavaScript, Angular, Spring Boot, AWS, and related technologies. Provides technical leadership, mentorship, code reviews, and innovation while collaborating with business partners, architects, analysts, engineers, and technical leads. Translates business logic into technical requirements, works in an Agile Scrum environment, and creates developer-facing technologies and documentation.

Build and operate high-scale internationalization infrastructure, including translation workflows, APIs, UIs, libraries, and platform tooling. Improve legacy systems through migrations while enhancing reliability, observability, latency, security, and cost efficiency. Prototype and productionize machine-learning and large-language-model capabilities, collaborate across engineering and business teams, and deliver measurable improvements in quality, adoption, developer productivity, and operational efficiency.

Develop and maintain a cross-browser web extension using React, TypeScript, HTML, and CSS, integrating with REST-based microservices. Collaborate with product, UX, and engineering teams on architecture and technical solutions. Improve application performance, enforce coding and testing standards, troubleshoot complex issues, and contribute to documentation. Mentor junior and mid-level engineers through reviews and pair programming while staying current with frontend technologies and security best practices.

Develop and maintain full-stack TypeScript applications using React, Node.js, and PostgreSQL. Build intuitive user interfaces, scalable APIs, and secure systems; collaborate on architecture, code reviews, testing, deployments, incident response, and infrastructure improvements. Mentor engineers, reduce technical debt, participate in Agile ceremonies, and support production systems in a remote-first environment.

Lead the design, development, and optimization of scalable web and mobile applications using Ruby on Rails, React, React Native, Docker, PostgreSQL, and AWS. Own architecture, APIs, data models, monitoring, performance, and code quality while collaborating with product, data, and DevOps teams. Provide technical leadership through system design, code reviews, mentoring, and continuous improvement in a remote-first healthcare technology environment.

Develop and support enterprise full-stack applications using Java, Spring Boot, Python, React, and cloud technologies. Build secure APIs, microservices, integrations, chatbot interfaces, and conversational UI features. Deploy cloud-native applications with Azure or AWS, Docker, and Kubernetes while contributing to CI/CD, testing, monitoring, security, and architecture. Collaborate with product, engineering, architecture, and business teams in an agile environment.

Build and maintain full-stack web features across database models, APIs, services, and user interfaces. Own product workflows from requirements and design through deployment, write production-ready code, collaborate with product and design, improve system reliability, and lead continuous releases. The role requires strong React, TypeScript, and Node.js experience, autonomy, clear communication, and a bias toward execution in a startup environment.

Lead end-to-end development of customer-facing product experiences and backend systems across frontend and backend layers. Design scalable services, APIs, and data flows; improve accessibility, performance, reliability, security, observability, and maintainability. Partner with Product, Design, Data, and engineering leaders to deliver complex initiatives, influence architecture, support incident response, mentor engineers, and connect technical decisions to customer and business outcomes.