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Senior Full Stack Developer (React + Node.js) at FusionHit. We are looking for a highly skilled Senior Full Stack Developer. to join an hourly contract opportunity focused on building and maintaining an internal web-based system. This platform supports core company operations by managing employee data, one-on-one meetings, and timesheets. The ideal candidate thrives in self-managed environments, writes clean and scalable code, and has deep expertise in modern JavaScript technologies.. Location:. Must reside and have work authorization in Latin America.. Availability:. Contract role with flexible schedule, estimated 10-15 hours per month.. The Ideal Candidate Has:. . 6+ years of experience as a Full Stack Developer or in similar roles.. . Expertise in React with TypeScript and UI component libraries like Material-UI (MUI).. . Strong experience with styled-components for CSS-in-JS styling.. . Backend development proficiency using Node.js, Express, and TypeScript.. . Experience with MongoDB and Mongoose for database modeling and data access.. . Strong understanding of code linting and formatting using ESLint and Prettier.. . Comfort handling date and time logic using Moment.js.. . Background in developing internal tools or business management systems.. . Self-starter who works independently and delivers high-quality results.. . Key Responsibilities:. . Design and implement new features for the company’s internal platform to manage employees, one-on-one meetings, and timesheets.. . Build modern, responsive user interfaces using React and MUI.. . Develop robust backend services using Node.js, Express, and TypeScript.. . Model and manage application data using MongoDB and Mongoose.. . Maintain code quality and consistency with ESLint and Prettier.. . Collaborate in feature planning and provide technical input for internal tooling improvements.. . Provide occasional support and ongoing maintenance for the platform.. . Company Location: Costa Rica.