Staff Engineer, Product UI Platform

<h3><strong>About the Role</strong></h3> <p>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.&nbsp;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.&nbsp;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.</p> <h3><strong>Responsibilities</strong></h3> <ul> <li>Lead the next phase of architectural evolution for the product application platform</li> <li>Design and implement foundational platform primitives used across product teams</li> <li>Reduce architectural entropy and duplication across the web surface</li> <li>Improve application-level performance and reliability metrics</li> <li>Drive incremental modularization without disrupting feature velocity</li> <li>Establish performance budgets and enforce application-layer guardrails</li> <li>Partner with Backend Platform to shape API ergonomics and integration boundaries</li> <li>Collaborate with SRE to ensure runtime stability and production readiness</li> <li>Write and maintain critical-path platform code</li> <li>Establish durable standards for how full-stack features are built</li> <li>Mentor engineers and help scale the platform capability over time</li> </ul> <h3><strong>Requirements</strong></h3> <ul> <l