React Developer (jr)

and

Numberz.ai Should‑Costing + Negotiation Copilot

idea → UI → API contract → production → iteration

Mission:

What you’ll do

• Implement product surfaces in

  React/Next.js + TypeScript

  ; contribute to the

  design system

  (Tailwind/shadcn, Storybook).
• Own UI ↔ API contracts:

  TypeScript types + Zod/JSON Schema

  , OpenAPI specs, and

  consumer‑driven contract tests

  (Pact/MSW).
• Integrate with

  Node.js

  services (REST/GraphQL); plan errors, retries, optimistic updates, and offline‑tolerant states.
• Ship core should‑costing flows:

  BOM Explorer

  ,

  Should‑Cost Review

  (materials/labor/overhead/FX),

  Quote Workspace

  (cross‑bid composite),

  Counter‑Offer Builder

  ,

  Supplier View

  .
• Instrument usage/events; watch

  LCP/INP/CLS

  and domain metrics (time‑to‑compare quotes, variance explained, acceptance rate); release behind

  feature flags

  .
• Write tests that matter (

  RTL/Jest/Vitest/Playwright

  ); keep CI green and previews useful.
• After release, read the data, fix papercuts, and simplify flows—the

  closed loop

  .

How you’ll use GenAI (Cursor & friends)

• Scaffold components with

  Tailwind

  and generate

  Storybook stories

  ; create

  MSW mocks

  from schemas.
• Draft Zod/TypeScript types from

  OpenAPI

  ; spot gaps; propose refactors.
• Summarize PR diffs, write changelog notes, and synthesize test data—then

  verify

  before committing.
• Move fast for first drafts—

  then fix as we go

  : semantics, a11y, contracts, and docs.

How we build (principles)

• Prototype to learn; productionize to last.

• Words first.

  Clear UX copy and obvious next steps.

• Accessibility is default.

  Keyboard paths, labels, contrast—every time.

• Performance has a budget.

  Measure and hold the line.

• Parity over excuses.

  Containers, seeded fixtures, contract tests; no “works on my laptop.”

• Close the loop.

  Ship small, observe real use, iterate.

• Horses for courses.

  Pick the simplest tool that works.

What you bring

• 3–6 years

  building React/TypeScript apps; comfortable with

  Next.js

  and

  Tailwind/shadcn

  .
• Experience integrating with

  Node.js

  backends; confident with

  types, schemas, and API contracts

  .
• Testing discipline (RTL/Jest/Vitest/Playwright) and CI hygiene.
• Curious about manufacturing: you’ve handled data like

  BOMs/RFQs/POs

  or want to learn fast.
• Async communication and time management in a remote setup.



Nice to have

• Exposure to

  Should‑Costing/Manufacturing

  workflows, supplier comparisons, or cost models.
• Data‑viz (Recharts/Visx/D3), analytics/experimentation basics, and performance tuning.
• Familiar with

  Cursor/Copilot

  and code review best practices.

PS: We aim to move fast - hope to close this in a week.