Senior Ux / Ui Engineer

We're seeking for a Senior UX / UI Engineer in Brazil - 100% remoteType : 6-Month Contract (with strong potential for extension)Location : RemoteAbout the RoleWe're looking for a Senior UX / UI Engineer to help build and improve internal web-based user interfaces for our Site Reliability Engineering teams.

This role is ideal for a front-end engineer who loves to get hands-on with React and enjoys improving user workflows, not just coding layouts.You'll be working on existing internal React applications (built by engineers, for engineers) — streamlining them, improving usability, and helping implement new functionality.What You'll DoEnhance and reorganize an existing internal React app to improve usability and maintainability.Build and implement intuitive web-based interfaces used daily by internal engineering teams.Collaborate with engineers and stakeholders to identify UX pain points and deliver better workflows.Bring a strong design sensibility to UI decisions, even if design is not your primary focus.Must-Have SkillsReact expertise — deep hands-on experience building and improving production React applications.Experience delivering solutions using multiple front-end languages or frameworks (you've picked up a "second and third language").

HTMX experience (required).

Lit experience is a plus (not mandatory).

Experience implementing and improving internal web-based applications.Comfort working in the UX layer — improving workflow, usability, and user experience (not just layouts).

Nice-to-Have SkillsSome UX design experience — wireframing, talking to users, or journey mapping.Experience with Go or Python (enough to be dangerous).

Familiarity with internal tools or applications (preferred over public-facing apps).

Soft SkillsGo-getter mentality — eager to learn, fix, and improve from day one.Curious and proactive — someone who would say, "I saw the issues in your React app, fixed them, and I'm ready to move forward."Focused on delivering impact to end users — able to articulate what you built, why it mattered, and how it improved the experience.