Software Engineer - React & Express.js

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May 14

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KIS Solutions

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Technology • SaaS • Artificial Intelligence

KIS Solutions is a technology consulting company based in the United States and Brazil, specializing in delivering software systems that solve complex business problems. With a focus on improving human experiences through technology, KIS provides customized tech solutions for businesses of all sizes, from Fortune 500 companies to startups. They leverage data management, machine learning, and user-focused design to create effective and efficient systems that enhance productivity and business value.

51 - 200 employees

Founded 2012

☁️ SaaS

🤖 Artificial Intelligence

📋 Description

• This is a remote position. • KIS is looking for a talented React & Express.js Software Engineer who is aiming to work on an international IT project! • This is an opportunity where you will focus on clean architecture, code performance, maintainability, mentorship, and client enablement. • If you think this fits your profile, we certainly look forward to talking to you! • Build and maintain modular, scalable React components using functional programming principles; • Promote coding standards and educate junior client teams on proper React patterns and tooling; • Implement unit and integration tests to ensure code reliability; • Optimize application performance and bundle size; • Design and maintain RESTful APIs using Express.js with a focus on modularity, testability, and maintainability; • Mentor junior client teams on backend architecture best practices; • Implement middleware for logging, authentication, validation, and error handling; • Integrate with SQL databases and external APIs; • Ensure API security, performance, and scalability.

🎯 Requirements

• 3–5+ years of experience with React (16.8+) , using hooks-based functional components • Proficient in React Router for client-side routing • Strong TypeScript skills with strict typing and generics, applied in both frontend and backend • Experience with state management solutions such as React Context • Familiarity with CSS-in-JS or utility-first CSS frameworks (e.g., Tailwind CSS) • Experience implementing unit and integration tests in both frontend and backend applications • Hands-on experience with Node.js (LTS) and Express.js for building RESTful APIs • Solid understanding of asynchronous programming and middleware patterns • Experience working with relational databases like MySQL • Input validation using libraries such as Zod • Environment and configuration management using dotenv, cross-env, or similar tools • API documentation using OpenAPI (Swagger) • Familiarity with Git and basic CI workflows (e.g., GitHub Actions)