JavaScript​/React Frontend Engineer strong REST API + Java, .NET or Node.js - W2

Job Summary

Java script/React Frontend Engineer with strong Rest API experience, fullstack on Java, .NET or Node.js.

NYC, NY (Hybrid – 3 days a week in office required).

W2 Contract.

Senior.

• Frontend-Focused Full-Stack Engineer (React + JavaScript) with strong Rest API experience with either Java, .Net or Node.js.
• Enhance and scale a growing AdTech platform centered on digital advertising capabilities.
• Emphasize modern frontend development with React and JavaScript while contributing to backend integrations through REST APIs across multiple technologies (Java, .NET, Node.js).
• Deliver high-performance user experiences for advertising platforms, including campaign management, targeting, measurement, and integrations across media and publishing ecosystems.

• Design and build modern, scalable frontend applications using React and JavaScript (Type Script preferred).
• Develop intuitive UI/UX for key AdTech capabilities, including
  • Campaign management dashboards
  • Targeting and personalization interfaces
  • Reporting and analytics views
• Optimize frontend performance, responsiveness, and usability.
• Collaborate closely with Product, Marketing, and Design teams to deliver high-quality user-facing features.

• Integrate frontend applications with REST APIs built in Java, .NET, or Node.js.
• Contribute to API design discussions to ensure efficient frontend-backend interaction.
• Support development and maintenance of backend services where needed, focusing on
  • API contracts
  • Data flow optimization
  • Service integration

• Scale and enhance an existing AdTech MVP platform to enterprise-grade solutions.
• Participate in system design discussions, code reviews, and technical planning.
• Work with cloud-based and distributed systems.
• Support CI/CD processes, deployment pipelines, and platform reliability.
• Integrate with advertising platforms such as Google Ad Manager, Koddi, and similar ecosystems.
• Troubleshoot production issues and improve performance and stability.

• 6-8 years of software engineering experience, with strong emphasis on frontend development.
• Strong expertise in JavaScript (ES6+), React (including hooks, state management, component architecture), and building complex, data-driven UI applications.
• Experience working with REST APIs (integration and/or design).
• Experience with modern frontend tooling (e.g., Webpack, Vite, CI/CD pipelines).
• Understanding of backend systems using one or more of:
  Java, .NET, Node.js.
• Experience with cloud-based applications and services.
• Familiarity with Agile development environments.
• Understanding of CI/CD, Dev Ops practices, and application resiliency.