Ux jobs in Brazil

Full‑Time (40+ hrs/week) | Fast‑Growth Startup | Contract or Contract‑to‑Hire

We are a fast‑growing, VC‑backed retail audit & execution platform that helps brands diagnose planogram compliance and optimize merchandising and category management workflows.

Our tools connect real‑world retail execution with an intelligent analytics backend powered by data, video workflows, and CVAI. We're a small, highly collaborative, and fast‑moving team.

Key Responsibilities:

• Core Product Development:
  • Build and maintain data‑driven dashboards using Ruby on Rails + React
  • Develop backend logic, algorithms, and data pipelines in Rails
  • Improve and expand internal Admin tooling for operations, analytics, and sales
  • Work on backend components powering the mobile app used by field shoppers
  • Ensure consistency between mobile data flows and dashboard experiences
• Collaboration & Code Quality:
  • Work closely with the CTO to ensure backend data is translated into clean, functional UX
  • Communicate timelines, tradeoffs, and constraints to non‑technical founders
  • Provide thoughtful code reviews for junior developers
  • Mentor junior developers on architecture and best practices (not people management)
• Platform & Infrastructure:
  • Build and integrate APIs between internal systems and external services
  • Work with third‑party tools (marketing automation, payments, workflow systems)
  • Improve performance, maintainability, and reliability across the codebase
  • Identify and fix bugs across frontend, backend, web, and mobile
  • Write unit tests and elevate testing best practices over time
  • Maintain clean, well‑structured, well‑documented code

• 5–8+ years of full‑stack engineering experience
• Strong proficiency with Ruby on Rails (backend, APIs, logic, data flows)
• Strong proficiency with React (frontend features, UI state, components)
• Experience working across the stack: backend services, APIs, frontend, and internal tools
• Ability to work with both new systems and existing/legacy code
• Experience with data handling, scaling, and performance optimization
• Startup mindset: adaptable, fast, independent, detail‑oriented
• Strong communication skills, especially with non‑technical stakeholders
• Experience reviewing code and mentoring junior developers
• Bonus Skills: React Native, AWS, background jobs (Sidekiq, queues, workers), data modeling or data pipeline experience

You’re a builder at heart. You enjoy owning full features end‑to‑end – backend logic, data models, UI, APIs, integrations, dashboards, internal tools. You like fast‑moving environments where engineering decisions directly impact the roadmap.

You’re comfortable collaborating with both technical and non‑technical founders. If you want the chance to build core product DNA in an early‑stage company, this role is for you.

• Opportunities to work on diverse and challenging projects
• Flexible working conditions
• A supportive and collaborative team environment
• 12 vacation days per year
• 5 sick days per year
• English classes
• Access to psychologist support for mental well‑being