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

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.

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.

Lead end-to-end design, development, and delivery of full‑stack features; drive architecture and code reviews; coordinate engineering work, write design docs and tests, and participate in Agile ceremonies. Must have blockchain/crypto experience.

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.

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.

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.

Lead backend TypeScript development and maintain services used by ~5M users. Contribute to full-stack features, code reviews, architecture discussions, mentor engineers, and collaborate with PM/design to build React-based web and mobile experiences.

Design, develop, test, deploy, and maintain full‑stack enterprise applications in AWS. Build front-end components (Angular/TypeScript), backend services (Java/Node.js), REST APIs, integrations, and relational database solutions. Troubleshoot production issues, participate in architecture and design, support CI/CD and deployment, conduct code reviews, mentor developers, and collaborate with Product, QA, and DevOps in Agile teams.

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.

Develop and maintain a large-scale production web application across UI and API tiers. Responsibilities include implementing frontend enhancements, fixing bugs, improving accessibility and performance, developing Python-based APIs, supporting third-party integrations and batch processing, enhancing search and administrative features, migrating legacy data, and ensuring application scalability, security, and reliability across multiple releases.

Build and scale a mortgage technology platform across Rails APIs, TypeScript and Node.js services, GraphQL, and React. Own third-party integrations, asynchronous workflows, multi-tenant security, observability, CI/CD, incident response, and technical design. Improve architecture and developer experience, mentor engineers, partner with product and customer success, and lead responsible AI-assisted development and shared AI tooling.

Own and develop a TypeScript monorepo spanning Next.js, Expo, and Cloudflare Worker applications. Build PostgreSQL and Prisma data models, webhook and background job systems, secure financial-data and authentication flows, and AI features using LLM tool-calling. Handle production ownership, on-call responsibilities, incident analysis, code review, and reliability improvements. Collaborate remotely with strong written and verbal English while maintaining security, performance, and data integrity.

Build enterprise workforce management software for forecasting, staffing, scheduling, adherence, intraday management, and operational reporting. Develop Java and Spring Boot microservices, React and TypeScript applications, REST APIs, event-driven workflows, PostgreSQL data models, integrations, and cloud-native deployments. Support CI/CD, production troubleshooting, performance optimization, architecture discussions, code reviews, and stakeholder collaboration across product, QA, DevOps, UX, and operations.

Build enterprise-scale 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, database models, integrations, and cloud-native deployments. Support CI/CD, performance optimization, production troubleshooting, architecture discussions, and client-facing collaboration. Apply workforce management expertise, complex business rules, scheduling algorithms, and high-volume operational data experience.

Own and develop a TypeScript monorepo spanning Next.js, Expo, and Cloudflare Worker applications. Build secure PostgreSQL and Prisma systems, webhook handlers, background jobs, authentication, encrypted financial data workflows, and AI-powered financial features. Responsibilities include production ownership, incident response, code review, and ensuring reliability, security, idempotency, and data isolation across web and mobile products.

Develop and support enterprise full-stack applications using React, Java/Spring Boot, and Python. Build secure APIs, microservices, integrations, chatbot interfaces, and cloud-native solutions. Deploy applications using Azure or AWS, Docker, Kubernetes, and CI/CD pipelines. Participate in architecture discussions, agile ceremonies, testing, code reviews, and security and compliance practices. The role requires production chatbot UI experience and collaboration with product, architecture, platform, and business teams.

Build and operate full‑stack features for an AI-driven contract management platform. Collaborate with product, data science, and design; own services from development to production; mentor teammates; apply DevOps, CI/CD, containerization, and distributed systems best practices to scale AI capabilities.

Build and maintain payment infrastructure for an online marketplace, including payment flows, banking integrations, internal ledgers, and financial record-keeping systems. The role focuses primarily on backend development in Python, with additional web and mobile frontend work using React. Engineers will support high-value transfers, new financial products, and collaborate within a small payments team.

Build and operate full-stack internal web applications and conversational AI bots using React, TypeScript, Node.js, Elasticsearch, Kibana, LLMs, RAG, and vector search. Responsibilities include technical design, development, testing, CI/CD deployment, feature flag management, production operations, and on-call support. The role also involves replacing legacy SaaS tools, integrating Elastic Stack capabilities, and using AI coding assistants to accelerate delivery.

Develop and support a multi-tenant operational platform for alternative investment managers. Build frontend features, backend services, APIs, data-ingestion workflows, validation, scheduled jobs, database migrations, audit trails, access controls, and automated tests. Investigate production issues, improve reliability, support customer deployments, participate in code reviews and releases, and coordinate with technical and DevOps teams on installations and upgrades.

Build and scale foundational services, APIs, pipelines, and distributed systems for an AI-powered SMS marketing platform. Own backend systems, improve scalability, reliability, modularity, and observability, and collaborate with engineering, data, product, and go-to-market teams. Use AI-first development practices, contribute to AI integration strategy, reduce technical debt, and support high-scale customer workloads across AWS and Kubernetes.