Top Javascript Jobs in Chicago, IL

Develop and maintain desktop, web, database, and middleware components using C#, HTML5, JavaScript, SQL Server, and RESTful APIs. Work includes real-time processing, concurrency, asynchronous and multithreaded programming, WinForms, web services, security, database scripting, and migration from Flex to AngularJS. Collaborate within an agile team, support build and testing infrastructure, maintain legacy code, and contribute to architectural improvements.

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 full-stack applications that deliver AI/ML insights through backend services, REST APIs, containerized microservices, and high-performance front-end interfaces. Responsibilities include cloud-native development on Google Cloud or Azure, database management, testing, CI/CD automation, security, troubleshooting, and Agile collaboration.

Build and maintain scalable JavaScript applications, API integrations, and open-source projects for global clients. Responsibilities include writing and reviewing code, debugging across frontend, backend, database, and network layers, optimizing performance, designing scalable architectures, handling concurrency, documenting technical work, and addressing edge cases. The role is fully remote and includes structured technical growth, peer feedback, and an assessment process involving an OSS hackweek.

Develop and maintain high-scale JavaScript and TypeScript advertising technology, specializing in Prebid.js, Prebid Server, header bidding, and Google Ad Manager. Own the header bidding wrapper, implement ad tech integrations, monitor Core Web Vitals and performance, review code, track industry standards, and maintain deployed solutions. The role requires deep programmatic advertising expertise, Google Cloud experience, and ownership of reliable client-side monetization systems.

Maintain and enhance existing public-facing geospatial applications for the USGS National Map. Develop with JavaScript, troubleshoot and improve code, and support scalable AWS-based data workflows using the AWS SDK, CLI, Lambda, S3, and EC2. Apply software engineering fundamentals, testing, debugging, version control, and analytical problem-solving while collaborating in a technical environment. Python, front-end frameworks, Node.js, REST APIs, additional cloud platforms, and Esri technologies are preferred.

Develop and maintain public-facing National Map applications for USGS. Responsibilities include improving existing functionality, troubleshooting, JavaScript development, AWS cloud workflow automation, testing, debugging, and scalability improvements. The role requires collaboration, analytical problem-solving, software engineering fundamentals, and experience with AWS SDK, CLI, Lambda, S3, and EC2. Preferred experience includes Python, modern front-end frameworks, Node.js, REST APIs, additional cloud platforms, and Esri technologies.

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.

The role requires expertise in JavaScript and experience with .NET applications, specifically focusing on Node JS and Amber JS. It's a contract-to-hire position.

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.