Fullstack Software Engineer

Ark is building the world’s highest-fidelity bioprocess simulation software to help life-saving therapies reach patients faster. By democratizing complex AI and multi-physics models in an intuitive software interface, we are ushering in a new era of digital bioprocessing.

With Ark, scientists can replace weeks-long, costly ($10K–$1M+) bioreactor experiments with simulations that run in seconds. This enables researchers to explore thousands more scenarios, accelerate time to market, and ensure more medical breakthroughs make it from the lab to the world.

We are looking for a UI-focused UX/UI Designer to lead the visual design of our customer-facing scientific software. This role is ideal for a designer who thrives in deep technical domains, enjoys strong ownership and autonomy, and is energized by working directly with scientists and software engineers to bring transformative medicines to patients faster.

• Fullstack product development – Build and ship end-to-end features spanning UI, APIs, and data layers.
• Frontend development – Build responsive, high-performance SPAs using React (or Vue) and Type Script.
• Data fetching & caching – Implement robust server-state management with React Query (Tan Stack Query), including caching, invalidation, optimistic updates, and pagination for scientific workflows.
• Auto-generated API clients – Collaborate with backend engineers to produce and consume auto-generated, type-safe API clients from OpenAPI specs (or shared schemas), ensuring frontend/backend contracts stay aligned.
• Backend development – Design and implement services and APIs in Python (FastAPI), integrating with Postgres and compute workloads.
• Schema-first integration – Use OpenAPI / JSON Schema and validation tooling (e.g.,
  zod
  ) to support safe, consistent communication and shared types across the stack.
• Performance & UX optimization – Ensure smooth rendering and intuitive interactions for complex visualization and simulation tools, while keeping API endpoints fast and reliable.
• Code quality & testing – Write modular, well-tested, and documented code across the stack in a collaborative Git workflow.
• Cross-functional collaboration – Partner with modelers, designers, and engineers to deliver cohesive, production-ready product features.
• Frontend: Type Script, React, Tailwind,
  React Query (Tan Stack Query)

2–5 years of professional experience in software development, with meaningful work across frontend and backend
.Strong proficiency with Type Script and a modern UI framework (ideally React
).Hands-on experience with React Query / Tan Stack Query (or equivalent) for server-state management—caching, invalidation, background refresh, and async workflows.

Experience generating and using typed API clients from OpenAPI (or similar schema-first approaches) in production.

Backend experience in Python/FastAPI (or similar) and building reliable, well-structured REST APIs.

• Comfort with relational data modeling and working with Postgres (migrations, query patterns, performance basics).
• Strong sense of code quality, modular design, and testing practices across the stack.
• Bonus:
  Experience with monorepos/type-sharing, Docker workflows, CI/CD, AWS, or 3D/visualization frameworks.

• Full-time, exempt
• Location: Cambridge, MA
• Benefits: Health, dental, and vision coverage, holiday and vacation time, 401k matching, stock options, and career growth opportunities

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