Founding Engineer @Plato (backed by Hexa)

Plato is building the OS for litigation lawyers.

With GenAI, the legal industry is on the verge of a major transformation. Litigation lawyers are overwhelmed by complex and repetitive tasks: complex damage calculations, thousands of documents to review, days spent drafting legal documents, and more.

⚡ Our mission: Build the leading OS for litigation lawyers, enabling lawyers to spend 5x less time on administrative and operational work, and focus instead on strategy and advocacy.

Plato already supports around ten law firms and 1 major insurance’s legal team specialized in personal injury, who use our solution daily to manage hundreds of active cases.

Founded in January 2026 by Ben (CEO) and Alexandre (CTO), we are backed by Hexa (formerly eFounders), Europe’s leading startup studio. Hexa has launched over 35 companies, including unicorns such as Front, Aircall, and Spendesk, collectively generating more than €230M in ARR and raising over €750M in funding.

Plato is already live with real users and real data, solving concrete legal workflows in production. We’re now entering a key building phase and looking for someone ready to take real ownership and help shape the product, architecture, and engineering culture from day one.

🎯 Your mission

We’re looking for a Founding Engineer to join as our first hire and work hand-in-hand with Alexandre - Co-founder & CTO.

You’ll help build the core product from the ground up: production AI systems, backend architecture, and user-facing features used daily by law firms and insurers.

This is not a research role. It’s about turning cutting-edge AI into reliable, real-world software in a complex, high-stakes domain. You’ll shape product decisions and own systems end-to-end, from early prototypes to production.

You’ll have a major impact on what we build, how we build it, and how engineering evolves at Plato.

Responsibilities

Product & Engineering

•Design, build and ship core features across platform, AI pipelines and integrations

•Own technical architecture choices with scalability, security, and compliance in mind

•Work closely with the founding team and studio partners from ideation to production

•Take part in every high-impact technical decision that will shape the product

AI & Production Systems

•Build and evolve production AI pipelines (LLMs, RAG, agent-based systems) for real legal workflows

•Ensure reliability, traceability, and explainability of AI outputs

•Continuously optimize performance, cost, and quality as the platform scales

Ownership, Quality & Scalability

•Own systems from build to production, with a strong focus on quality, reliability, and scalability

•Support live deployments with law firms and insurance companies

•Help define how engineering is done at Plato (processes, standards, tooling)

🤩 This role is for you if

You’re an experienced, product-minded engineer who enjoys building real systems in complex environments and owning things end-to-end.

You like working close to founders and users, making pragmatic technical decisions, and shipping software that actually runs in production.

You’ll thrive in this role if you:

• Have built production systems in startup or product environments, with real ownership over features or architecture

• Are comfortable with full-stack TypeScript + React and happy to work across backend, product, and infrastructure

• Are curious about LLMs and generative AI: you’ve experimented with them and want to turn them into reliable products

• Have a strong product mindset: you care about the “why” and think in terms of user impact

• Enjoy working with unstructured data and document-heavy workflows

• Are pragmatic in execution: you know when to go deep vs when to ship fast

• Are energized by early-stage ambiguity and taking ownership alongside technical founders

• Bonus points if you have production experience with cloud infrastructure, document ingestion (OCR), agent-based systems, or regulated environments.

⚙️ Our tech stack

• Our stack is designed to support AI-first workflows and production reliability.

• Backend & Frontend: TypeScript, Node.js, React, tRPC

• Infrastructure: AWS (Terraform)

• Data & AI: Bedrock, Textract & custom agents

• Database: SQL (PostgreSQL)

  You don't need to master every tool — what matters is your ability to design robust systems, learn fast, and make sound technical trade-offs.

💎 What we offer

• Ownership & Impact: As the first engineering hire, you'll have real influence on the product and technical direction

• Bring AI to real users: Build production AI systems that solve real problems in a complex, high-stakes domain

• Hexa ecosystem: Access to expertise, resources, and network from one of Europe's leading startup studios

• Competitive package: Attractive salary + meaningful equity

• Paris-based team: Work alongside the founding team in our office

• Growth: Opportunity to grow into a technical leadership role as the team scales

  Plato is committed to creating a diverse environment. All qualified applicants will receive consideration for employment irrespective of gender, origin, identity, background and sexual orientation. We know there's a long way to go regarding diversity in our industry, which is why we encourage all applicants to apply to our open positions.