Senior Design Engineer

iSummation Technologies

Senior Design Engineer at Summation building production UI in React and TypeScript. Leading the design system and mentoring engineers in a hybrid role located in Bellevue, WA.

Posted 4/11/2026full-timeBellevue • Washington • 🇺🇸 United StatesSeniorWebsite

Tech Stack

Tools & technologies

D3.jsReactTypeScript

About the role

Key responsibilities & impact

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 from Figma into resilient, testable components with strong state management
Drive UI performance: bundle hygiene, code-split plans, rendering strategy, perceived latency
Partner with data visualization to express complex financial concepts with clarity
Establish guardrails: lint rules, Storybook checks, accessibility checks, visual regression in CI
Mentor engineers and designers on interaction patterns, system thinking, and front-of-frontend craft
Contribute to product quality across the stack through reviews, pairing, and high-signal documentation

Requirements

What you’ll need

4+ years building production web UI with React and TypeScript
Strong CSS fundamentals: layout, fluid type and spacing, responsive systems, motion
Design system experience: tokens, component architecture, Storybook, documentation
Data visualization in production using one of Recharts, D3, Visx, ECharts, or similar
Accessibility and quality: semantic HTML, WCAG basics, keyboard and screen reader support, automated checks
Figma fluency: components, variants, auto-layout, dev mode, and handoff
Proven ability to take a concept from Figma to shipped code without heavy PM overhead

Benefits

Comp & perks

Professional development
Hybrid work arrangement

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills & Tools

ReactTypeScriptCSSData visualizationFigmaAccessibilitySemantic HTMLWCAGStorybookComponent architecture

Soft Skills

MentoringCollaborationPrototypingSystem thinkingInteraction patterns