Founding Fullstack Software Engineer (FE Focus)

Atrix AI-Native Platform Builder

Breakthrough medicines all start the same way: years of research, mountains of data, and countless decisions made by medical teams within the world's premier biopharma labs. These decisions then determine which treatments make it to market, how doctors learn about them, and ultimately which patients get access to life-saving care and when. We're at an inflection point. AI-powered drug discovery, precision medicine, and an explosion of real-world evidence have accelerated what's possible, but the teams translating science into patient access are drowning in data they can't use. The tools haven't kept up with the stakes. Atrix builds purpose-built AI for life sciences, designed for the accuracy and rigor biopharma requires. We're live with top-10 pharmaceutical companies, scaling fast, and focused on one thing: helping the right treatments reach the right patients, sooner.

The Role Description

You'll be a core builder of the Atrix AI-native platform, designing and shipping features that turn complex healthcare and AI workflows into intuitive, elegant interfaces, trusted by scientific, medical, and commercial teams across top pharma companies. From crafting thoughtful front-end UX to building robust backend systems, you'll help bridge our AI core with real-world customer pain points, working on problems that genuinely move the needle in patient care. We're building a modular, agentic platform that connects to customer-approved data sources, transforms messy, unstructured data using advanced AI, and delivers structured, actionable insights that drive decisions in regulated environments. You'll see your work used daily by medical, clinical, and commercial teams making high-stakes decisions. You'll tackle rich engineering challenges across:

• Performance — We're processing large data sets at once
• Security & Privacy — Customers trust us with sensitive data
• Explainability — AI outputs must be verifiable and traceable
• Composable UI/UX — Interfaces need to adapt to varied use cases, from chat to dashboards to spreadsheets

You'll work closely with our Engineering Team and CEO, and collaborate as a peer to product, design, and GTM leadership. As one of our earliest Full Stack Engineers, you'll help define technical architecture, influence product strategy, and set the tone for future engineering hires. This is a hybrid role based in NYC (ability to be in office is required), with flexibility for remote work on some days as needed.

Responsibilities

This role is perfect for someone who is customer-obsessed, technically fluent, and thrives in fast-moving startup environments. If you love the challenge of translating AI workflows into intuitive product experiences in a high-stakes industry, we want to talk to you.

• Own and evolve our web stack (React/Next.js + Python) to support fast, reliable AI-native workflows
• Collaborate directly with product and design to shape user-facing features from spec to ship
• Translate complex backend data structures into intuitive, delightful interfaces
• Debug and improve frontend and backend systems to increase performance and reduce latency
• Attend key customer and sales meetings to understand real-world workflows and incorporate feedback into product design
• Drive architectural improvements to support scale, modularity, and developer velocity
• Take full ownership of core product modules across the stack.

Must haves:

• 5+ years experience as a fullstack or frontend-focused engineer
• Previous B2B and startup experience required
• Expertise in React/Next.js and frontend systems architecture
• Comfortable working across the stack in Python when needed
• Passionate about user experience and shipping polished, performant UIs
• Proven ability to own projects end-to-end, from planning to deployment
• Experience with distributed systems, APIs, and performance optimization
• Desire to get involved in customer meetings, hear their feedback, and help translate that to a delightful experience

Nice to haves:

• Background in life sciences, healthcare, or real-world data
• Data science experience
• Work experience at healthcare AI startups or technical consulting firms
• Experience deploying AI in regulated or enterprise settings

Why Join Atrix as a Fullstack Software Engineer?

Mission-Driven Impact Your work will help life sciences teams deliver the right treatment to the right patient—faster. Real-world clinical outcomes start with better tools, and you'll be building them.

Customer-Centric & High-Stakes You won't be building in a vacuum. You'll work directly with top-10 pharma companies to understand how AI can transform medical workflows—this is high-impact, high-visibility work.

End-to-End Ownership Own major parts of the stack, shape technical architecture, and influence product direction from day one.

Early Stage, High Growth We're small and moving fast. You'll help shape both the technology and the culture as we scale.

Tech Meets Trust Design AI-native workflows that scientific and medical teams trust and depend on daily.

Clear Growth Path Opportunity to grow into a Lead Frontend or Fullstack Tech Lead role as we expand the engineering team.

What We Offer

Health & wellness support – Stipend + medical (vision, dental, health) insurance coverage Unlimited PTO – Recharge when you need to