Fullstack Software Engineer (JS, TS, React, Nodejs)

Job Description

• 6–8+ years of full-stack development experience
• Strong proficiency in JavaScript and TypeScript
• Solid experience with React and Node.js
• Comfortable working with legacy frontend code (jQuery, Backbone) and backend .NET Framework codebases
• Familiarity with SQL Server and writing performant SQL queries
• Experience with GraphQL, Apollo Client, and MongoDB
• Knowledge of feature flagging tools like LaunchDarkly
• Ability to contribute in both monoliths and microservice environments
• Skilled at balancing speed, scope, and maintainability in large systems
• Excellent communication and collaboration skills
• Fluent in English

Job Responsibilities

• Maintain and improve legacy code that is still critical to the business, including jQuery-based UIs and .NET services
• Help identify, scope, and migrate legacy features to modern stacks
• Design and implement React + Node.js microservices in alignment with the platform architecture
• Collaborate with PMs, designers, and engineers to refine requirements and propose efficient solutions
• Ensure code quality through thoughtful practices, including unit testing, peer reviews, and documentation
• Proactively identify ways to reduce complexity or improve performance across the system
• Document technical decisions and approaches clearly for future maintainers
• Guide and support other developers who interact with legacy systems
• Participate in agile ceremonies, sprint demos, and team discussions with a focus on pragmatic outcomes

Department/Project Description

Our client provides a human insight platform that allows organizations to gather feedback from real users interacting with their products.

We’re seeking a Full Stack Software Engineer to support the Participant Experience Core team in maintaining critical legacy features while contributing to a modern, microservices-based platform. You’ll work across both stacks: keeping the lights on in jQuery and .NET-based code while helping migrate functionality to a more modular and scalable React + Node.js ecosystem.

This role is ideal for someone who can comfortably work across frontend and backend systems, enjoys solving real problems for real users, and is motivated by striking a balance between pragmatism and long-term vision.