Staff Engineer, Product UI Platform

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About this role

Staff Engineer, Product UI Platform San Francisco About the Role 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. 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

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