Senior Front End Developer

Sysmind; Moline (IL); On-site; USD 100,000 - 130,000; Full time

Job summary

A leading tech company is seeking an experienced Senior Frontend Developer to join their team. You will be responsible for developing high-performance web applications using JavaScript and React.js, integrating with APIs, and collaborating with designers to implement functional interfaces. The ideal candidate will have over 8 years of experience and a strong understanding of UX principles. This role offers the opportunity to enhance your skills in a dynamic environment while working on innovative web solutions.

Qualifications

• 8+ years of experience in frontend development, specifically with JavaScript and React.js.
• Experience with API integration and version control using Git/GitHub.
• Understanding of UX principles for usability and accessibility.

Responsibilities

• Develop and maintain applications using JavaScript and React.js.
• Build reusable components and maintain front-end architecture.
• Integrate frontend with RESTful and GraphQL APIs.
• Collaborate with designers to implement UI/UX wireframes.
• Optimize applications for performance and compatibility.
• Debug UI issues and manage application state using modern tools.
• Write unit tests and participate in code reviews.

Skills

JavaScript

React.js

API integration

GitHub

Basic UX principles

Job description

We are looking for an experienced Senior Frontend Developer with 8+ years of experience specializing in JavaScript, React.js, and API integration. The candidate will be responsible for building scalable, high‑performance user interfaces and collaborating with cross‑functional teams to deliver end‑to‑end web solutions.

Responsibilities

• Develop, enhance, and maintain web applications using JavaScript (ES6+) and React.js.
• Build reusable UI components and implement clean, maintainable front‑end architecture.
• Integrate frontend applications with RESTful APIs / GraphQL APIs for dynamic data flow.
• Work closely with designers to translate UI/UX wireframes into functional interfaces.
• Optimize applications for performance, responsiveness, and cross‑browser compatibility.
• Debug and resolve UI/functional issues across web applications.
• Manage application state using Redux, Context API, or other state management tools.
• Write unit tests using tools such as Jest or React Testing Library.
• Use Git/GitHub for version control, branching, and collaborative development.
• Ensure the application adheres to basic UX principles for usability and accessibility.
• Participate in code reviews to maintain coding quality and standards.

Minimum Years of Experience

• 6+ years

Must Have Skills

• JavaScript or other equivalent front end programming languages
• Use of GitHub
• Basic UX principles
• React.js
• API integration