Principal Software Engineer (UI / React)

Job Title - Principal UI Engineer (Reactjs)Job Location - Pune or BengaluruExperience - 8 to 10 yearsBudget - INR 60 lacsAbout the Position: Our client is seeking a Principal UI Engineer to serve as the architect of our React ecosystem. In this role, you won't just build features; you will be the /"Engineer for the Engineers/" responsible for the scalability, performance, and developer velocity of our entire frontend organization. Your mission is to ensure that our developers can ship world-class interfaces with high confidence and zero friction.Key Responsibilities: React Architecture & Evolution: Own the transition and implementation of modern React patterns, including React Server Components (RSC), streaming SSR, and advanced data-fetching patterns (e.g., Next.js App Router or Remix). API Contract Simplification: Act as the primary bridge between UI and Backend/Platform teams. You will drive the design of /"Frontend-Friendly/" APIs, advocating for BFF (Backend-for-Frontend) patterns or GraphQL layers to aggregate complex microservices into simple, flattened contracts. Developer Experience (DX) Tooling: Architect and maintain a high-performance build pipeline. This includes migrating legacy Webpack/Babel setups to Rust-based tooling (Vite, Biome, or Turbopack) to achieve sub-second hot-reloading and lightning-fast CI builds. Design System Engineering: Lead the technical implementation of our headless UI component library. Ensure strict TypeScript safety, accessibility (Aria-compliance), and seamless integration with tokens-based design workflows. AI-Augmented Productivity: Evaluate and integrate AI coding assistants (e.g., Cursor, GitHub Copilot, or custom LLM agents) into the team’s workflow to automate boilerplate, unit test generation, and documentation. Performance Observability: Build custom dashboards to monitor Core Web Vitals and React-specific metrics (render counts, commit times). You are responsible for keeping our /"Time to Interactive/" (TTI) best-in-class. Success Metrics for the First Year Build Performance: Reduce local development startup time and CI pipeline duration by >50%.Onboarding Velocity: Reduce the /"Time to First PR/" for new hires from days to hours through improved scaffolding and CLI tools. System Adoption: Achieve 90%+ adoption of the core Design System across all product squads. Code Health: Lower the Change Failure Rate by implementing automated /"guardrail/" tooling that catches architectural drifts before they hit production. A great Principal UI Engineer doesn't just write code; they build a platform where writing great code is the path of least resistance. How this differs from a Senior Role Unlike a Senior React Dev, you aren't assigned to a product squad to build /"A dashboard/" You are horizontal. You are the one who decides how the dashboard page is built, which version of React we use, and how we measure its success.

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