Senior Fullstack Engineer - React/JS

RyzLabs

Buenos Aires Remote permanent

Posted: March 16, 2026

Required Skills

Job Description

Remote position, only for professionals based in Argentina or Uruguay

RYZ Labs is seeking a Full Stack Engineer (React / JavaScript) to join one of our clients’ teams building intelligent, secure, and scalable digital experiences. In this role, you will contribute to modernizing existing applications while building new user-facing features using React and modern JavaScript technologies.

You will work closely with cross-functional teams including backend, product, and platform engineers to deliver reliable and scalable solutions. The ideal candidate will help evolve the front-end architecture while navigating a legacy environment and integrating modern technologies.

Responsibilities

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Develop and maintain modern React-based user interfaces using clean, reusable, and maintainable code.

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Build responsive and intuitive UI components using React and Material UI (MUI).

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Implement styling using SCSS while maintaining consistent design and UI standards.

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Integrate front-end applications with REST APIs and backend services.

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Collaborate with backend engineers to deliver end-to-end product functionality.

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Participate in the modernization of legacy applications and help migrate existing features to modern front-end frameworks.

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Maintain and improve existing codebases while ensuring scalability, performance, and maintainability.

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Write and maintain unit and integration tests to ensure code quality.

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Review code and provide constructive technical feedback to team members.

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Debug and resolve production issues across the application stack.

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Contribute to front-end architecture decisions and development best practices.

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Participate actively in Agile ceremonies, including stand-ups, sprint planning, and retrospectives.

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Create and maintain technical documentation.

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Stay current with modern front-end development practices and tooling.

Qualifications

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5+ years of professional experience in software development.

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Strong experience with React and modern JavaScript frameworks.

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Proficiency in JavaScript and/or TypeScript.

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Experience building UI using Material UI (MUI).

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Strong experience with SCSS or modern CSS frameworks.

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Experience integrating REST APIs into modern web applications.

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Proficiency with Git version control.

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Experience building responsive and user-friendly web applications.

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Experience working in Agile development environments.

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Strong collaboration and communication skills across engineering teams.

Nice to Have

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Familiarity with ASP.NET WebForms and Razor templating.

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Ability to read and understand C# code.

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Experience with Gulp or similar asset pipeline tools.

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Experience with testing frameworks such as NUnit or Jest.

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Familiarity with Azure DevOps and NuGet.

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Experience working in legacy modernization projects.

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