Sr. Frontend Engineer

MMD Services; Chicago (IL); On-site; USD 90,000 - 120,000; Full time

Job summary

A technology services firm is seeking a Senior Front-End Engineer to design and build scalable web applications. This role combines hands-on development and architectural influence. Responsibilities include developing applications using React and Node.js, optimizing performance, and mentoring team members. Ideal candidates will have over 5 years of experience in front-end engineering and strong skills in HTML5, CSS3, and REST API integration. Competitive environment focused on collaboration and best practices.

Qualifications

• 5+ years of professional front-end engineering experience required.
• Strong knowledge of front-end development practices essential.
• Experience in building scalable web applications necessary.

Responsibilities

• Design, develop, and maintain scalable web applications using React.
• Collaborate with product managers and designers for intuitive applications.
• Integrate front-end applications with RESTful APIs.

Skills

React

Node.js

HTML5

CSS3

Agile development

State management

REST APIs

End-to-end testing

Performance optimization

Job description

Our client is seeking a Senior Front-End Engineer to help design and build scalable, high-performance web applications that power modern digital experiences. This role blends hands‑on development with architectural influence and offers the opportunity to shape front‑end best practices while mentoring engineers and contributing to enterprise‑level products. You will collaborate closely with product managers, designers, and backend engineers to deliver intuitive, performant applications that support large‑scale user engagement.

Responsibilities

• Design, develop, and maintain scalable web applications using React, TypeScript, and Node.js
• Build modular and reusable UI components using modern React patterns including functional components and hooks
• Implement efficient state management and data‑fetching strategies
• Develop responsive, accessible user interfaces using HTML5, CSS3, and modern styling frameworks
• Integrate front‑end applications with RESTful APIs and collaborate with backend teams on API contracts
• Troubleshoot and optimize application performance across complex front‑end systems
• Identify opportunities to reduce technical debt and improve front‑end architecture
• Contribute to architectural discussions and help guide front‑end best practices
• Write and maintain unit, component, and end‑to‑end tests
• Participate in code reviews and maintain high engineering standards
• Collaborate with product and design teams to translate business requirements into scalable technical solutions
• Contribute to CI/CD processes and work with DevOps teams to support reliable deployments

Skills & Qualifications

• 5+ years of professional front‑end engineering experience
• Strong experience with React
• Experience with Node.js
• Strong knowledge of HTML5, CSS3, and modern front‑end development practices
• Experience integrating and consuming REST APIs
• Experience building scalable enterprise web applications
• Familiarity with state management and data‑fetching libraries
• Experience with unit testing and end‑to‑end testing frameworks
• Strong understanding of front‑end performance optimization
• Experience working in Agile development environments

Nice to Have

• Exposure to AWS or cloud environments
• Experience with CI/CD pipelines and modern build tools
• Experience working on large‑scale consumer‑facing applications

MMD Services Inc. is an equal opportunity employer. All applicants are considered for all positions without regard to race, religion, color, sex, gender, sexual orientation, pregnancy, age, national origin, ancestry, physical/mental disability, medical condition, military/veteran status, genetic information, marital status, ethnicity, alienage, or any other protected classification, in accordance with applicable federal, state, and local laws.