Location
Remote (Requires 4 hours overlap with Australia AEST) Employment: Long-term contractor (full-time, 40h / w).
You'll invoice monthly; standard Net-14 terms. Hiring entity: Testfully Pty Ltd (Australia).
The Opportunity
Build for developers, at scale. At Testfully, you'll ship tools used worldwide and take on hard technical problems—fast UIs, reliable runtimes, and thoughtful DX—owning solutions end-to-end.
If you enjoy hard problems and clean solutions, you want ownership and momentum, you'll fit right in.
The Role: Make Developer Life Easier
You'll spend ~90% of your time shipping product — roughly 70% business logic / 30% UI. Build core product logic (TypeScript).
Ship maintainable modules shared across Web, Desktop, CLI, and extensions using clear patterns and architecture. Create reusable UI (React).
Contribute to our design system (TypeScript, Radix UI, Tailwind) in an Nx monorepo. Ship micro-frontends.
Deliver Web / Desktop features using our design system, Akita (state) and RxJS (reactive flows).
Extend the CLI
Add features and keep parity with the apps via shared TypeScript packages. Shape architecture.
Partner with the CTO on decisions that guide how we build.
The Fit
Curious, Gritty, TypeScript-First, React-Savvy. You learn fast, love hard problems, work independently, and hold yourself accountable end-to-end.
You turn ambiguity into shippable steps and communicate crisply.
We expect the following technical competencies: Expert in React.
Shipped large-scale, stateful apps that solve complex business problems; strong in component design, performance, and accessibility. Design systems.
Built reusable component libraries with React and TailwindCSS; think in tokens, composition, and maintainability.
Bonus: Experience with Rust, Golang, GraphQL, RxJS, or prior work on developer tools.
AI at Testfully
Human-Led, AI-Accelerated. AI is an enabler, not a replacement.
We build with Claude in the loop—today, 100% of new features use AI for coding, tests, docs, and exploration—while human judgment and ownership decide what ships.
You're expected to leverage AI daily, then apply your expertise to refine, verify, and be accountable for outcomes. We also push back hard on low-quality outputs: No AI slop.
Reject or rewrite weak suggestions; keep code readable and type-safe.
Ship with meaningful tests, docs / migrations, and profiling where it matters.
Don't accept choices that harm DX, performance, accessibility, or API clarity. Proven code only.
When This Role Isn't a Fit
Hands-off approach. Early-stage startup = everyone ships, debugs, documents, and helps shape the product.
No bystanders. Low tolerance for ambiguity.
Priorities shift. You'll need to self-direct, make calls with incomplete info, and adapt quickly. Avoids direct feedback. We use real-time, candid feedback to move fast and raise quality—always with respect and care.
How to Apply
* with subject: Lead Front-end Engineer (React, TypeScript).
A short cover note with relevant experience and expected monthly rate.
(Optional) links to GitHub / portfolio / OSS. We'll review and get back to you with next steps.
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