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Specialist II – Front-End, React, SPA Architecture
Location
Brazil
Posted
71 days ago
Salary
0
Seniority
Senior
Job Description
Specialist II – Front-End, React, SPA Architecture
Grupo Boticário
• How will your day look? - Lead the architecture of the "One Page Cockpit": Be responsible for the technical design and implementation of a very high data-density interface (Data-Heavy SPA), enabling planners to simulate infinite "what-if" scenarios without page reloads and with Time to Interactive below 50ms. - Performance Engineering and Virtualization: Implement advanced React rendering techniques (virtualization of lists/tables to support tens of thousands of SKUs), aggressive memoization, aggressive code-splitting, and browser Event Loop management to ensure the interface never freezes (Main Thread Block). - Transient State Management (Draft Mode): Develop complex, bidirectional client-side mathematical logic (GMV ↔ Volume). You will orchestrate the "draft" state in local memory (State Management) while synchronizing deltas (the edited cells) in the background with our BFF (Kotlin/EKS) and DynamoDB. - Visual and Advanced Graphics Synchronization: Ensure a single visual Source of Truth across distinct components. If a user edits a "Baseline" cell in the table, the associated charts (recharts/D3 or embedded Tableau Extensions) must immediately reflect the updated trend line. - Integration and Real-Time: Consume RESTful APIs and design continuous bidirectional communication via WebSockets with the backend, ensuring progress updates for long-running executions (orchestrated by AWS Step Functions) update toasts and progress bars on screen smoothly. - Technical Quality and Tooling: Lead Clean Code best practices in the repository. Define a comprehensive automated testing pipeline (Unit Tests with Jest/Vitest, Integration with React Testing Library and E2E with Cypress/Playwright) and work on CI/CD with GitHub Actions and cloud deployment.
Job Requirements
- Requirements and qualifications:
- Solid experience in high-complexity Front-End: Practical, proven experience in the architecture and development of corporate SPAs (Single Page Applications) that handle massive on-screen data volumes, complex grids, and interactive dashboards.
- Extreme proficiency in React and TypeScript: Absolute mastery of React lifecycles, custom Hooks, Server-Side Rendering (SSR) vs Client-Side Rendering (CSR), and strict TypeScript typing to protect the application from runtime errors.
- Mastery of State Management and Data Fetching: Deep knowledge of modern global state libraries (Zustand, Redux Toolkit) and cache/network orchestration (RTK Query, React Query / TanStack Query).
- Frontend Test Architecture: Ability to design efficient frontend test pyramids, focusing on user behavior (Behavior-Driven) rather than brittle implementation tests.
- Technical capability and critical thinking: Ability to profile rendering bottlenecks using native browser tools (Chrome DevTools Performance), identify memory leaks, and refactor array-manipulation algorithms in JavaScript.
- Good communication and business alignment: Ability to collaborate closely with UX/UI Designers and Product Managers, translating system user journeys into highly ergonomic, reusable interface components.
- Differentials:
- Professional experience with the AWS cloud ecosystem (e.g., static hosting on Amazon S3, distribution via CloudFront CDN, and edge functions via Lambda@Edge).
- Familiarity with developing or integrating Agentic AI-oriented components (on-screen copilots, token streaming in the interface, generative UI rendering).
- Previous experience developing extensions for DataViz tools (especially Tableau Extensions).
- Experience migrating legacy monolithic systems or heavy Excel spreadsheets to world-class web applications.
Benefits
- Here, your Health is a priority
- . Medical and dental plan
- . Medication assistance
- . Health allowance for family members
- . Complimentary psychotherapy sessions
- . Telemedicine and second medical opinion
- . Free flu vaccination
- . Health care programs
- To take care of your Nutrition
- . Food allowance
- . Year-end food allowance
- Ensuring Well-Being and Quality of Life in all aspects
- . Gym and fitness studio plan
- . Home office allowance (hybrid and remote work models)
- . Pet health plan
- . Birthday day off
- . Up to 40% discount on our products
- . Employee association (partnerships and discounts: multi-brand store, TotalPass gyms, courses and more!)
- . Travel and accommodation program
- For Family, our most precious asset
- . Childcare allowance
- . Infant nutrition credit
- . Babysitter allowance
- . School supplies allowance
- . Legal, psychological and social counseling
- . Support for atypical parents
- . Extended parental leave (180 days for mothers and 120 days for fathers)
- Financial security for protection and peace of mind
- . Life insurance
- . Bereavement support for loss of parents
- . Private pension plan
- . Payroll-deductible loans
- Benefit packages are configured according to eligibility rules.*
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