Senior Frontend Developer- Chat SDK Lead

Celebal Technologies · India

Senior Frontend Engineer – Chat SDK Lead

Job Title: Frontend Developer

Location: Jaipur

Experience: 5–10 Years

Role Summary

We are looking for a Senior Frontend Engineer – Chat SDK Lead to own a React-based component library powering AI chat interfaces across the organization. The role involves technical ownership of the SDK, release management, real-time streaming capabilities, testing, and direct collaboration with consumer engineering teams.

Mandatory Skills

• 5+ years of hands-on experience building and shipping React component libraries or SDKs consumed by multiple teams.
• Strong expertise in TypeScript , including generics, discriminated unions, strict mode, and declaration emit.
• Strong experience with React and modern frontend architecture.
• Hands-on experience with SSE/streaming protocols and real-time application development.
• Strong understanding of AbortController lifecycle and cancellation patterns .
• Experience with real-time state management using React Query, useReducer, Context , or equivalent approaches.
• Experience designing and maintaining public APIs/component libraries with a focus on backward compatibility and extensibility.
• Hands-on experience with release management , including Semantic Versioning (semver), changelogs, breaking-change management, and monorepo tooling.
• Experience with Turborepo, Changesets , or equivalent monorepo/release management tools.
• Ability to lead technical discussions with product/engineering teams, negotiate API contracts and technical trade-offs, and prepare migration documentation.
• Strong experience with automated testing for complex frontend/public API surfaces.

Preferred Skills

• Experience building AI/LLM chat interfaces , including streaming completions and tool-call rendering.
• Experience with React 19 , including Server Component boundaries and "use client" patterns.
• Experience with multi-model/provider integrations or AI gateway abstractions.
• Experience with Storybook, Biome and tsdown .
• Experience with TanStack React Query .
• Exposure to OpenAI SSE and AG-UI/custom streaming events .
• Experience with local-first storage and client-side data eviction strategies.
• Experience with 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 | Changesets | Private npm Registry

Key Responsibilities

• Own the technical direction and architecture of the Chat SDK .
• Design and maintain streaming interfaces and real-time state management.
• Handle complex streaming scenarios including tool-call correlation and provider-specific events.
• Own SDK release lifecycle, versioning and breaking-change coordination.
• Establish and maintain comprehensive automated test coverage.
• Work directly with consumer teams on integration, troubleshooting, API contracts and extensibility.
• Create migration guides and technical documentation for SDK consumers.