Senior React/Next.js Engineer – UI & Performance

Machine Learning Technologies, LLC; Chicago (IL); On-site; USD 150,000 - 190,000; Full time

Job summary

Machine Learning Technologies, LLC, based in Chicago, seeks a senior frontend engineer to build and maintain web applications with React.js and Next.js. You will create reusable UI components, integrate with RESTful APIs and backend services, and partner with UX designers to deliver accessible, high-performance interfaces.

You will own code quality, participate in reviews, and mentor junior developers while aligning with Agile processes and deployment practices.

Qualifications

• 8+ years in software development with frontend focus.
• 5+ years hands-on React.js experience.
• Strong Next.js and modern frontend frameworks knowledge.
• Hands-on with Redux, Context API, or Zustand for state management.
• Experience integrating REST and GraphQL services.
• Understanding microservices and event-driven architectures.
• Frontend testing with Jest, RTL, or Cypress.
• Familiar with Git, CI/CD pipelines, and Azure deployments.
• Strong debugging, performance optimization, and problem-solving skills.

Responsibilities

• Develop and maintain web apps using React.js and Next.js.
• Build reusable, responsive UI components.
• Integrate frontends with RESTful APIs and backend microservices.
• Collaborate with UX/UI designers for user-friendly interfaces.
• Optimize performance, accessibility, and responsiveness.
• Participate in code reviews and establish coding standards.
• Troubleshoot and resolve issues across dev, test, and prod.
• Work with backend teams on secure, efficient integrations.
• Participate in Agile ceremonies and contribute to best practices.
• Mentor junior developers and share knowledge within the team.
• Support deployment activities and production issue resolution as needed

Skills

Frontend development

React.js

Next.js

State management

REST & GraphQL APIs

Microservices architecture

Frontend testing

Git & CI/CD

Azure deployment

Performance optimization

Tools

Redux

Context API

Zustand

REST APIs

GraphQL

Jest

React Testing Library

Cypress

Job description

Machine Learning Technologies, LLC, based in Chicago, seeks a senior frontend engineer to build and maintain web applications with React.js and Next.js. You will create reusable UI components, integrate with RESTful APIs and backend services, and partner with UX designers to deliver accessible, high-performance interfaces.

You will own code quality, participate in reviews, and mentor junior developers while aligning with Agile processes and deployment practices.