Senior Frontend Engineer - SDK Lead

Senior Frontend Engineer - SDK Lead

Experience: 5–10 Years
Contract: 3 Months (Extendable)
Shift: 10 AM – 7 PM

We are hiring a Senior Frontend Engineer - SDK Lead with strong experience in React, TypeScript, SDK/component library development, and real-time streaming applications.

Must Have skills: React 19 (Latest version), ShadCN, Tailwind CSS, Typescript, Tanstack Query

What You'll Do

• Architect a TypeScript-strict, ESM-only React SDK supporting dual streaming protocols (OpenAI SSE + AG-UI custom events)
• Solve hard real-time problems: streamed tool-call correlation, reasoning-token extraction across providers, AbortController lifecycle, and local-first storage with eviction
• Own release lifecycle: semver strategy, changesets, CHANGELOG curation, breaking-change coordination across peer dependencies
• Lead integration calls with consumer teams — triage issues, negotiate API contracts, define extensibility patterns (transport factories, request/response mappers, feature-flag presets)
• Establish test coverage for a high-complexity public API surface (currently a gap at v5.0.0)

Required

• 5+ years shipping React component libraries or SDKs consumed by multiple teams
• Deep TypeScript — generics, discriminated unions, strict mode, declaration emit
• SSE/streaming protocols, AbortController patterns, real-time state management (useReducer + Context, React Query)
• Release management discipline: semver, changelogs, monorepo tooling (Turborepo/changesets)
• Can run technical calls with product teams, negotiate tradeoffs, and write migration guides

Preferred
-AI/LLM chat interfaces — streaming completions, tool-call rendering, multi-model routing
React 19 (Server Component boundaries, use client directives)
Storybook 10.x, Biome, tsdown
Portkey AI gateway or similar multi-provider abstraction layers
Tech Stack
TypeScript 5.7 · React 19 · tsdown · Turborepo · Biome · Storybook 10 · TanStack React Query · SSE (OpenAI + AG-UI) · Changesets · Private npm registry

Good communication and the ability to work with product/consumer teams on technical integrations are required.

Apply here: https://lnkd.in/gWXPx8RV

Please apply only if you are comfortable with a 3-month contractual role.

Pay: From ₹1.50 per month

Work Location: Remote