Design Engineer

Senior Design EngineerSummation 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.Roles & ResponsibilitiesBuild production UI in React and TypeScript for Summation's web appLead the Summation Design System: tokens, components, theming, accessibility, docs, and release workflowPrototype end-to-end product ideas in code, validate with real data, and graduate winners into productionCraft motion and micro-interactions that clarify meaning and reduce cognitive loadTranslate flows and states from Figma into resilient, testable components with strong state managementDrive UI performance: bundle hygiene, code-split plans, rendering strategy, perceived latencyPartner with data visualization to express complex financial concepts with clarityEstablish guardrails: lint rules, Storybook checks, accessibility checks, visual regression in CIMentor engineers and designers on interaction patterns, system thinking, and front-of-frontend craftContribute to product quality across the stack through reviews, pairing, and high-signal documentationYou will love this role if youLove working across design and code, and care about the details users feelThink in systems: tokens, states, variants, docs, upgrade pathsPrototype ideas fast and are comfortable deleting code after an experimentBelieve accessibility, performance, and clarity are product featuresEnjoy collaborating with PMs, designers, and backend engineers in a high-context startupRequired experience4+ years building production web UI with React and TypeScriptStrong CSS fundamentals: layout, fluid type and spacing, responsive systems, motionDesign system experience: tokens, component architecture, Storybook, documentationData visualization in production using one of Recharts, D3, Visx, ECharts, or similarAccessibility and quality: semantic HTML, WCAG basics, keyboard and screen reader support, automated checksFigma fluency: components, variants, auto-layout, dev mode, and handoffProven ability to take a concept from Figma to shipped code without heavy PM overheadNice to haveRemix or Next.js, Tailwind, shadcn/uiFramer Motion for interaction designWebGL or Canvas experience for advanced interactionsVisual regression and accessibility tooling in CIExperience in fintech, analytics, or complex data products