Staff Engineer, Product UI Platform

Together AI•San Francisco, CA

9h•$200,000 - $275,000

About The Position

Together AI is seeking a highly experienced Staff Engineer to join the Product Engineering team, to own and evolve the Product UI Platform — the architectural foundation that powers how product teams build full-stack features across our web surface.This role is responsible for evolving the product runtime from its current monolithic growth architecture to a scalable, modular, and high-leverage platform that supports increasing scale, reliability requirements, and a growing number of feature engineers. You will define and drive the technical direction of the Next.js/typescript/nodejs web runtime, BFF layer, and application integration patterns, partnering peer-to-peer with Backend and API Platform leaders to ensure cohesive architectural evolution across layers. This is a deeply hands-on role for and experienced engineer with real life experience leading and implementing architectural evolution and is ready to take full ownership of a critical technical domain.

Requirements

8+ years building production-grade web applications and backend systems
Demonstrated ownership of a product application platform used by multiple teams
Deep expertise in React/Next.js/TypeScript and server-side application architecture
Strong backend experience with TypeScript
Experience evolving monolith architectures into modular systems
Web Vitals performance optimization experience across browser → API → data layers
Proven ability to drive and implement architectural change in a cross functional collaborative environment
Experience establishing technical standards and scaling developer velocity
History of owning complex technical decisions and their outcomes

Responsibilities

Lead the next phase of architectural evolution for the product application platform
Design and implement foundational platform primitives used across product teams
Reduce architectural entropy and duplication across the web surface
Improve application-level performance and reliability metrics
Drive incremental modularization without disrupting feature velocity
Establish performance budgets and enforce application-layer guardrails
Partner with Backend Platform to shape API ergonomics and integration boundaries
Collaborate with SRE to ensure runtime stability and production readiness
Write and maintain critical-path platform code
Establish durable standards for how full-stack features are built
Mentor engineers and help scale the platform capability over time