Senior Fullstack Engineer

At Parallel, we build AI agents that help healthcare organizations automate their administrative processes and unlock additional revenue, starting with medical coding.

Today, up to 25% of healthcare spending is lost to manual, repetitive administrative tasks. Legacy software hasn't helped: it has made work slower, more complex and more frustrating for care teams.

We believe AI agents can change this. Our technology combines large language models with system-level automation to do real work inside existing hospital tools. No integration, no disruption.

Our first agent automates coding and frees up time for medical teams to focus on patients.

We launched in 2024 and already have 800+ customers and a team of 30+ people. We are backed by top-tier investors (Index Ventures, Y Combinator, Hexa, Frst, Kima Ventures, Better Angle and the CEO of Mistral AI), and this is just the beginning.

The future of healthcare isn't just digital, it's automated. Come help us build it!

Context

We're at a pivotal moment. We've closed a $20M Series A with Index Ventures, we're deployed in 40+ hospitals, and we're scaling fast. The company was built by Paul Lafforgue (Polytechnique, ex-Meta, ex-McKinsey) and Chris Rydahl, whose previous company Hublo became Europe's largest healthcare staffing platform. We're 15 people, based in Paris.

We're now hiring a Senior Full-Stack Engineer to help us scale — not just to write code, but to shape our architecture, make key product decisions, and define our engineering culture.

Your mission

Own the full technical stack — from core backend services to user-facing interfaces — and help deploy reliable AI agents in hospitals.

Concretely, you will

• Build production-grade systems, not prototypes — robust, secure, and HDS-compliant, designed to run in demanding hospital environments
• Ship and iterate on LLM-powered agents that automate complex end-to-end workflows
• Work alongside the CTO to make the right architecture decisions, balancing speed and long-term scalability
• Build interfaces that doctors and administrative operators actually want to use — understanding their pain points, not just closing tickets
• Lay the engineering foundations: CI/CD, observability, internal tooling, code quality standards

Outcomes

In your first months, we expect you to

• Own the full lifecycle of major features — from spec to production monitoring
• Design a modular backend architecture that supports multiple clients with complex, custom business rules
• Deploy AI agents in production with a high reliability bar
• Build and maintain solid data pipelines between hospital systems and our stack, HDS-compliant
• Improve team velocity through better tooling, CI/CD, and observability

This job is for you if

• You have 5+ years of full-stack experience
• You're strong in Node.js & TypeScript (NestJS, Express, Prisma, Postgres) and React (TanStack, Tailwind)
• You've played with LLMs and AI agents — whether on side projects or professionally (LangChain, Hugging Face)
• You're comfortable with infrastructure and deployment (AWS, Docker, Terraform, Kubernetes, GitHub Actions)
• You care about the product, not just the code — you push back when something doesn't make sense, and you propose solutions proactively
• You're autonomous and pragmatic — done beats perfect, especially at this stage
• You're French-speaking
• You graduated from a top engineering school

Hiring process

• Quick call with Chris, our CTO
• Case study at our Paris office
• Meeting with Paul, our CEO
• Drinks with the team

Why join us?

• Real traction. Seed and Series A closed in under a year, with Index Ventures on the cap table. This isn't a maybe — it's a company that's moving.
• A problem worth solving. Cutting hospital admin directly gives time back to care teams. The impact is tangible.
• A genuinely different technical approach. Agents that work on top of existing systems without heavy integration is a real competitive edge — and you'll be the one building it.
• A team that has done it before. The founders have built and scaled before (Hublo, Meta, McKinsey). High standards, low ego.
• Actual ownership. You won't be handed a backlog. You'll co-build the architecture and set the engineering culture from the ground up.
• Competitive salary and equity package, premium health insurance (Alan), Swile meal vouchers, latest Apple equipment, Paris office (Strasbourg Saint-Denis).
• Flexibility: on average one day of remote work per week, and one remote week per year.

We care about who you are, not just what's on your CV.

If you're drawn to what we're building but don't meet every requirement, we still want to hear from you. Studies show that women in particular tend to apply only when they meet 100% of the criteria. If that's you, please don't let that hold you back. We'd love to receive your application.