Senior Frontend Engineer

Build and maintain production-grade Next.js (App Router) + React + TypeScript applications — dashboards, chat/copilot surfaces, and agentic research UIs.

Design and ship data visualizations (time series, breakdowns, combo charts, KPI strips) with a charting library (we use ECharts) — readable, performant, on-brand.

Craft AI/agent UX: streaming "thinking" traces, multi-step/agent fan-out progress, grounded follow-up conversations, and the rich result artifacts (boards, reports, canvases) users interrogate.

Own and extend a design system — design tokens, reusable components, motion/animation, and accessibility — keeping a large surface visually consistent.

Prototype mock-first for rapid product iteration, then graduate proven flows to real data and APIs.

Care about performance and correctness: React rendering, SSR/hydration, bundle size, and the subtle bugs that come with modern React.

Do light fullstack glue: build and consume REST/JSON APIs, wire up a backend service or BFF endpoint, shape data contracts, and integrate LLM/agent backends.

Keep the codebase healthy: typed, linted, documented, and easy for the next person (human or AI agent) to pick up.

3+ years building web apps with React and TypeScript in production.

Strong with a modern React framework (Next.js or similar) — App Router, SSR/CSR trade-offs, data fetching, routing.

Real fluency in CSS / a utility framework (Tailwind) and translating design into pixel-faithful, responsive, accessible UI.

Experience with data visualization / charting and making dense information legible.

Solid product instincts — you make sensible UX decisions independently and sweat the details (states, empty/loading/error, motion, micro-interactions).

Comfortable with Git, code review, and shipping iteratively; you write code that reads like the code around it.

You can stand up and consume an API — Node/Express or Python/FastAPI — and reason about request/response shapes, auth, and async behavior.

You're comfortable integrating LLM / agent APIs (streaming responses, tool/function calls) and modeling that on the frontend.

You don't need to be a backend specialist — but you shouldn't be blocked waiting for one.

AI-native UX experience: copilots, RAG/agent interfaces, streaming/token-by-token UIs, or "show your reasoning" patterns.

Building or maintaining a design system / component library.

Fintech / payments domain exposure (acceptance rates, routing, fraud, PSPs) — or eagerness to learn it fast.

Animation/motion craft (Framer Motion, CSS transitions, tasteful micro-interactions).

Working alongside AI coding agents and keeping a repo that's legible to them (clear conventions, docs, typed contracts).

An eye for performance profiling and React rendering optimization.

Speed-to-working-flow beats premature robustness — we prototype to learn, then invest where it counts.

Tight loop with PM and design; you'll often shape the experience, not just implement it.

Small surface area of ownership, high autonomy, high craft bar.