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Full-Stack Engineer (Frontend) at Zipdev. Role Overview. Our client is building a greenfield web platform that delivers modern, cloud-based experiences aligned with Sensei Cloud. The application is modular in nature and will grow over time.. As a Full-Stack Engineer with a frontend focus, you will be a core contributor shaping the user experience and frontend architecture from the ground up — while remaining capable of working across the entire stack when needed. Your primary ownership area is the React/TypeScript frontend: building customer-facing features, implementing responsive layouts, and integrating with the Rails API. You will also contribute to backend work as the team and product evolve.. This is a full-product ownership role in a HIPAA-regulated healthcare environment, requiring strong technical judgment, attention to compliance, and close collaboration with your fellow engineers and product stakeholders.. You will work within a Human → AI → Human engineering workflow, using AI tools to accelerate development while maintaining full accountability for code quality and correctness.. Key Responsibilities. Primary (Frontend). Design, build, and maintain React components for a dental practice scheduling application. Implement responsive, mobile-first layouts using Tailwind CSS and standard breakpoints (sm, md, lg). Integrate frontend features with a Rails-based API using Axios and TanStack Query for data fetching, caching, and mutations. Implement Azure AD B2C authentication using MSAL, including protected routes, token acquisition, and Axios interceptors. Maintain clean, readable TypeScript code that conforms to ESLint and Prettier standards. Shared (Full-Stack). Contribute to Rails API endpoints, data models, and background jobs as needed. Collaborate closely with backend-focused engineers and product stakeholders throughout feature development. Participate in AI-augmented development workflows, reviewing and validating AI-generated code against acceptance criteria. Follow Git best practices: feature branches, pull requests for all changes, and conventional commit messages. Proactively update documentation when behavior or architecture changes. Core Technical Skills. Strong experience with TypeScript and React, including functional components and custom hooks. Experience consuming REST APIs using Axios, including authentication header injection. Proven ability to build responsive UIs using a utility-first CSS framework (Tailwind or similar). Experience with server-state management libraries such as React Query, SWR, or RTK Query. Working knowledge of a server-side framework (Rails, Express, Django, or similar) — you don’t need to be an expert, but you should be comfortable reading and contributing to backend code. Familiarity with relational databases (PostgreSQL preferred) and REST API design. Familiarity with Git-based workflows, including pull requests and conventional commits. Comfortable reading and maintaining Markdown documentation. AI-Augmented Development (Required). Hands-on experience using AI coding assistants (e.g., Claude Code, GitHub Copilot, Cursor) as part of daily development. Clear understanding of the Human -> AI -> Human review loop, with human ownership of all decisions. Ability to maintain supporting documentation such as READMEs, architecture notes, and AI configuration files (e.g., CLAUDE.md). Awareness of AI traceability practices, including commit trailers, review checklists, and prompt hygiene. HIPAA & Compliance Awareness (Required). Strong understanding that Protected Health Information (PHI) must never appear in code, tests, logs, commits, or error messages. Comfort working exclusively with synthetic or mock data (e.g., SYNTHETIC_-prefixed data). Awareness of secure coding practices, including no hardcoded credentials, no PHI in browser storage, and structured logging. Technologies & Tools. You will work with the following technologies as part of the CSD Cloud Apps stack:. Frontend (Primary). Language: TypeScript 5. Framework: React 19 (functional components, hooks). Build Tooling: Vite 7. Styling: Tailwind CSS 4, clsx, tailwind-merge (cn() helper). Server State: TanStack Query (React Query) v5. Routing: React Router v7. HTTP Client: Axios (with authentication interceptors). Authentication: Azure AD B2C via MSAL. Code Quality: ESLint 9, Prettier 3. Backend (Collaborative). Framework: Ruby on Rails 8.1 (API-only mode). Database: PostgreSQL 16. Background Jobs: Sidekiq with Redis 7. Testing: RSpec, FactoryBot, WebMock, VCR. Shared. Development Environment: Docker Compose. Version Control: Git with feature branches and pull requests. Preferred / Nice-to-Have Qualifications. Familiarity with Azure AD B2C and MSAL authentication flows. Experience with Ruby on Rails, especially API-only mode. Healthcare or dental domain experience. Experience optimizing Vite builds and implementing code splitting. Exposure to WebSockets or real-time updates (e.g., ActionCable). Experience contributing to a greenfield product from early stages. Company Location: Argentina.