Senior Design Engineer

Job description

About Summation Summation is building an AI Business Planning Platform for CFOs and finance teams. We combine a real-time modeling layer with Addison, our AI calculation engine, to turn messy enterprise data into decision-grade insights. Customers use Summation to model scenarios, explain variances, and automate weekly and monthly reviews. The role: Design Engineering at Summation lives at the intersection of product design and frontend engineering. As a Senior Design Engineer, you will ship beautiful, high-performance product experiences in production code, lead our design system, prototype new interactions, and raise the bar on accessibility, motion, and polish. You will partner closely with Product, Design, and Engineering, moving from Figma to code to shipped features. Roles & Responsibilities: Build production UI in React and TypeScript for Summation’s web app Lead the Summation Design System: tokens, components, theming, accessibility, docs, and release workflow Prototype end-to-end product ideas in code, validate with real data, and graduate winners into production Craft motion and micro-interactions that clarify meaning and reduce cognitive load Translate flows and states f...