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

As a Senior Full Stack Engineer, you will develop and maintain the US Sports platform, mentor junior engineers, and collaborate with stakeholders to enhance systems and processes.

The Senior Full Stack Engineer will develop scalable applications, manage both front-end and back-end tasks, and enhance platform engineering practices. Responsibilities include API development, database design, and technical documentation.

The Senior Full-Stack Developer will design, build, and maintain AIO Logic's cloud-based AXIS platform, utilizing React and Java/Spring Boot to deliver software solutions for complex financial workflows, collaborating with cross-functional teams, and mentoring junior developers.

Lead the design, development, and maintenance of core applications, focusing on system integrations and managing multiple third-party applications while mentoring junior developers.

The Senior Platform Engineer will develop features for an ecommerce platform, mentor engineers, optimize systems, and improve tools and processes.

The role involves backend development for a new venture team, focusing on building scalable systems, collaborating on product strategy, and launching an MVP.

The Senior Full Stack Developer will build end-to-end solutions, collaborate in a remote environment, and write technical documentation. The role requires expertise in Ruby on Rails and various programming paradigms.

Lead and modernize core Laravel/PHP backend systems and high-performance React/TypeScript frontends. Architect integrations (MLS/RETS/RESO), improve video processing and media delivery, strengthen CI/CD and Docker deployments on AWS/Rackspace, introduce AI-driven automation, and provide senior technical leadership and mentorship.

Design and build scalable features for MongoDB's Internal Developer Portal using Backstage. Collaborate with teams to enhance developer workflows and internal tools.

As a Senior Full-Stack and Platform Software Engineer at mabl, you will develop features for an AI-powered test automation platform, enhancing user experiences, designing APIs, and optimizing data pipelines while collaborating with cross-functional teams.

Lead technical discussions and design products based on vehicle telematics data. Collaborate with teams, ship features, and ensure customer satisfaction using real-time data insights.

Design and build core services for AI products, implement compliance guardrails, debug fullstack issues, and participate in code reviews.

As a Senior Software Engineer, you'll implement collaboration features, support team architecture, work across tech stacks, and improve developer experience.

Design and implement AI-powered backend systems for media experiences in Dropbox, collaborating with cross-functional teams, and influencing technical decisions.

Lead the development and maintenance of content ingestion systems, oversee software feature design, communicate across teams, and mentor members.

Rapidly triage and resolve customer-reported full‑stack bugs across 3D visualization, report/PDF generation, and databases. Independently investigate unfamiliar codebases, implement tested fixes, ensure performance integrity, collaborate with CSE to prioritize and deploy fixes, and reduce backlog velocity.

As a Senior Full Stack Engineer, you'll work with a cross-functional team to implement features, develop with TypeScript, and ensure scalability and reliability of applications.

Build enterprise-grade features for multi-location customers: frontend React+TypeScript interfaces, admin consoles, backend APIs, SSO/RBAC security, multi-tenant PostgreSQL architectures, and well-tested, maintainable code.

As a Full Stack Engineer, you will build features from database to UI, implement integrations, ensure stability, and improve the platform with a focus on technical excellence and user experience.

The Senior Full-Stack Developer will create software solutions jointly with clients, ensuring high-quality code and effective collaboration with the team.

The Senior Full Stack Engineer will build and enhance web visualization tools, collaborate with teams, support scalable APIs, and maintain CI/CD processes.

Lead modernization of a legacy .NET/SQL Server payment-integrity platform: migrate services to modern .NET, design reliable RESTful APIs, improve database performance, implement security and observability, and use AI agents to accelerate refactors and testing while partnering with product, UX, DevOps, and QA to ship high-quality features.

Lead full-stack projects, collaborate with teams to develop user-friendly features, mentor teammates, and handle on-call duties at Dropbox DocSend.

The Senior Full Stack Engineer will architect and ship scalable features, mentor teammates, and collaborate on improving the rental platform experience for users.

As a Senior Full Stack Engineer, you'll develop secure, user-facing data applications, collaborating with cross-functional teams while ensuring compliance with performance and security standards.