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

The Senior Full-Stack Engineer will lead technical areas, develop AI application services, maintain APIs, collaborate on design, and ship product features.

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.

As a Senior Fullstack Engineer, you'll contribute to backend development for Toast's New Ventures team, collaborating on architecture and launching MVPs while addressing unmet operator needs.

As a Senior Full Stack Engineer, you will develop and maintain web applications for Dandy's 3D design tools, manage APIs, and integrate cloud services to optimize the operations process.

Develop and enhance web-based 3D tools for dental applications, focusing on user experience, performance optimization, and integration of frontend and backend services.

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.

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

The Senior Fullstack Engineer will build and manage enterprise authentication systems, improve user session management, ensure security compliance, and support internal API usage across services, while enhancing performance and reliability.

The Senior Full Stack Engineer will develop and maintain features for Engrain's products, integrate AI tools, mentor junior staff, and support DevOps practices.

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.

Build end-to-end features, design intuitive interfaces, manage asynchronous backend jobs, and contribute to open-source efforts, while leading project development from concept to monitoring.

Lead the development of Coperniq's platform by designing, developing, and maintaining scalable full-stack solutions while collaborating with teams and mentoring juniors.

Design, build, and maintain resilient full-stack services for distributed financial SaaS systems. Lead end-to-end projects, optimize performance, ensure security and observability, mentor teams, and reduce technical debt.

As a Senior Full Stack Engineer, you will develop scalable software solutions, mentor junior engineers, and improve system performance by integrating various technologies.

Lead design, build, and scale GridUnity's cloud SaaS platform. Own end-to-end features, mentor engineers, drive architecture, improve scalability/reliability/security, collaborate with product teams, and introduce engineering best practices and tooling.

The Senior Full-Stack Engineer will develop user-facing features, maintain high-performance interfaces, implement backend APIs, and ensure product reliability and performance in a growing AI marketplace.

As a Senior Full Stack Engineer, you'll implement product features, ensure high quality, and collaborate with teams to enhance user engagement and experience.

Build full-stack, user-facing features alongside ML engineers using TypeScript, Node.js, GraphQL, and Postgres. Implement and integrate AI/LLM/ML tools, own features end-to-end from design to production, maintain scalability/reliability/observability, participate in code reviews and design discussions, and contribute to product ideation and RFCs.

The Senior Full Stack Software Engineer at Dropbox will design and develop user-friendly experiences, manage projects end-to-end, and collaborate across teams while leading initiatives and delivering AI-enabled product enhancements.

The role involves responsibilities related to full-stack product engineering, with participation in on-call rotations for team support.

Seeking a Senior Software Engineer II for a Product Growth team to enhance user acquisition, retention, and monetization with technical leadership and data-informed decisions.

The Senior Full-Stack Engineer will design, implement, and maintain systems for Trading API customers, focusing on both frontend and backend development, while leading projects and mentoring peers.

Develop consumer-centric web applications, enhance usability, collaborate with designers, implement backend software and APIs, write tested code, and follow agile development cycles.

Design and maintain scalable applications, develop APIs, optimize backend services, and collaborate in Agile environments to enhance user experience.

The Senior Fullstack Engineer will build and ship features for mobile apps and backend systems, manage technical architecture, and collaborate with product and design teams to develop scalable solutions.