Top Javascript Jobs in Denver & Boulder, CO

Own the specification, design, and implementation of features for FareHarbor’s large-scale web application. Collaborate with product team members, develop scalable and performant full-stack solutions, improve automated testing, resolve technical challenges, and participate in code reviews. The role requires strong Python and JavaScript skills, experience with front-end and back-end frameworks, relational databases, performance optimization, and agile development.

Build and maintain a TypeScript/JavaScript SDK for IP video playback across web, smart TVs, and set-top boxes. Design clean APIs, implement video playback components (MSE/EME/DRM), optimize reliability and performance, collaborate with cross-functional teams, and support operations to ensure high-quality streaming for millions of users.

Build and evolve Netflix’s shared JavaScript application platform, including internal CLIs, SDKs, CI/CD workflows, development tooling, monorepo infrastructure, deployment integrations, and supporting services. Improve platform observability, performance, reliability, and developer experience while partnering across teams, supporting users, defining interfaces, validating infrastructure changes, and providing technical leadership without direct management.

Enhance, maintain, troubleshoot, and improve existing public-facing geospatial applications for the USGS National Map. Develop with JavaScript, support AWS-based cloud data workflows using services such as Lambda, S3, and EC2, and improve code efficiency, scalability, testing, and maintainability. Collaborate with technical teams to diagnose problems and implement practical solutions. Preferred experience includes Python, modern front-end and Node.js development, REST APIs, additional cloud platforms, and Esri technologies.

Develop and maintain public-facing applications supporting the USGS National Map. Improve existing JavaScript applications, troubleshoot issues, enhance data presentation, and optimize scalable cloud-based workflows using AWS services. Collaborate with technical teams to design maintainable solutions, automate data processing, test software, and improve application efficiency. The role requires strong software engineering fundamentals, analytical problem-solving, and experience with JavaScript and AWS technologies.

Develop and maintain high-scale JavaScript and TypeScript monetization solutions using Prebid.js, Prebid Server, and Google Ad Manager. Own the header bidding wrapper, integrate auction and ad-tech standards, optimize Core Web Vitals and client-side performance, operate Google Cloud services, review code, document architecture, and resolve production issues.

Build end-to-end features in a JS/TS stack, designing scalable backend services and responsive real-time frontends. Improve observability, performance, and reliability, collaborate with product/design, and own full-stack implementation from APIs and data models to UI.

Build and maintain prototype web mapping applications and visualizations using JavaScript/TypeScript and ArcGIS web SDKs. Create interactive 2D/3D cartographic UIs with modern frameworks, collaborate with SDK teams, experiment with WebGL and real-time browser visualizations, and support early-stage geospatial innovation.

Develop applications for a top financial institution focusing on front-end development and participating in the full software lifecycle.

Join a team of JavaScript developers focusing on browser-based JavaScript development without frameworks. Knowledgeable in various technologies is necessary.

The JavaScript Developer will create high performing front-end applications, test them, and collaborate within an Agile team environment.

The role involves leading the development of a high-performance Web SDK for fraud detection and risk management, implementing algorithms for device fingerprinting, and ensuring security and performance optimization.

Senior full‑stack engineer responsible for building backend services (Node.js/TypeScript) and integrating with frontends (React/Vue). Ship production APIs, collaborate cross‑functionally, own delivery, mentor peers, and develop modular, testable, performant systems across diverse greenfield projects.

The Senior Full Stack JavaScript Developer will build and maintain user interfaces using React and Next.js, integrate with Node.js backends, and guide other developers. Responsibilities include ensuring accessibility, performance, and reliability of features, engaging in code reviews, and collaborating closely with product teams.