Founding AI Engineer @Plato (backed by Hexa)

<h3><strong>⚖️ Who are we</strong></h3><p style="min-height:1.5em"><strong>Plato is building the AI OS for litigation lawyers.</strong></p><p style="min-height:1.5em">With AI, 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.</p><p style="min-height:1.5em"></p><p style="min-height:1.5em"><strong>Our mission:</strong> Build the leading <strong>AI OS for litigation lawyers</strong>, enabling professionals to work <strong>5x faster</strong>, by putting their whole firm on autopilot.</p><p style="min-height:1.5em"></p><p style="min-height:1.5em">Plato already supports more than 30 law firms and 1 major insurance company’s legal team, who use our solution daily to manage hundreds of active cases.</p><p style="min-height:1.5em">Founded in January 2026 by <a target="_blank" rel="noopener noreferrer nofollow" href="https://www.linkedin.com/in/ben-lasseri/">Ben</a> (CEO) and <a target="_blank" rel="noopener noreferrer nofollow" href="https://www.linkedin.com/in/alexandredeboutray/">Alexandre</a> (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.</p><p style="min-height:1.5em">Plato is live with real users, real data and real revenue, solving concrete legal workflows in production. We’re now looking for a Founding AI Engineer to help us turn the latest advances in AI into reliable products used every day by legal professionals.</p><p style="min-height:1.5em"></p><h3><strong>🎯 Your mission</strong></h3><p style="min-height:1.5em">You’ll work directly with <a target="_blank" rel="noopener noreferrer nofollow" href="https://www.linkedin.com/in/alexandredeboutray/?locale=fr_FR">Alexandre</a> , our CTO, at the intersection of <strong>AI, software engineering and product</strong>.</p><p style="min-height:1.5em">Your job is not to do AI research for the sake of research. You’ll experiment with models and approaches, understand what works, and turn the best solutions into <strong>reliable production systems</strong>.</p><p style="min-height:1.5em">You'll work on problems such as building agentic workflows, making sense complex legal documents, designing autonomous long-running agents, and improving the quality and reliability of AI-generated outputs.</p><p style="min-height:1.5em"></p><p style="min-height:1.5em"><strong>Responsibilities</strong></p><p style="min-height:1.5em"><strong>Build AI-powered product features</strong></p><ul style="min-height:1.5em"><li><p style="min-height:1.5em">Design and ship AI features used directly by lawyers</p></li><li><p style="min-height:1.5em">Be at the bleeing edge of the agentic stack: memory, sandboxes, code mode, lots of tools, subagents…</p></li><li><p style="min-height:1.5em">Turn prototypes and experiments into production-ready feature</p></li></ul><p style="min-height:1.5em"><strong>Work with complex data</strong></p><ul style="min-height:1.5em"><li><p style="min-height:1.5em">Extract, structure and reason over large volumes of unstructured legal documents</p></li><li><p style="min-height:1.5em">Build robust data and document-processing pipelines</p></li><li><p style="min-height:1.5em">Experiment with different models and approaches to improve accuracy and reliability</p></li></ul><p style="min-height:1.5em"><strong>Make AI work in production</strong></p><ul style="min-height:1.5em"><li><p style="min-height:1.5em">Evaluate and improve agent outcomes through testing, evals and iteration</p></li><li><p style="min-height:1.5em">Optimize systems for quality, latency and cost</p></li><li><p style="min-height:1.5em">Build the backend services and infrastructure needed to run AI reliably at scale</p></li></ul><p style="min-height:1.5em"><strong>Shape the product</strong></p><ul style="min-height:1.5em"><li><p style="min-height:1.5em">Work directly with the founders and users to understand real-world problems</p></li><li><p style="min-height:1.5em">Move quickly from problem → experiment → production (think days, not weeks)</p></li><li><p style="min-height:1.5em">Take ownership of your projects from exploration to deployment</p><p style="min-height:1.5em"></p></li></ul><h3><strong>🤩 This role is for you if</strong></h3><p style="min-height:1.5em">We're looking for a <strong>strong software or AI engineer with 2+ years of experience</strong> who wants to build real-world AI products at the forefront of the agentic stack.</p><p style="min-height:1.5em">You like working close to founders and users, making pragmatic technical decisions, and shipping software that actually runs in production.</p><p style="min-height:1.5em"></p><p style="min-height:1.5em"><strong>You’ll thrive in this role if you:</strong></p><ul style="min-height:1.5em"><li><p style="min-height:1.5em">Have a strong <strong>software engineering foundation</strong>, ideally with Typescript and experience shipping production systems</p></li><li><p style="min-height:1.5em">Have experience with <strong>agents and/or evals</strong> and frameworks like Mastra, Eve, Pydantic, Langchain, etc…</p></li><li><p style="min-height:1.5em">Can take an AI problem from <strong>experimentation to production</strong></p></li><li><p style="min-height:1.5em">Enjoy <strong>solving problems</strong> with no clear solution</p></li><li><p style="min-height:1.5em">Have a strong <strong>product mindset</strong> and care about user impact</p></li><li><p style="min-height:1.5em">Are <strong>autonomous and pragmatic</strong>, comfortable navigating early-stage ambiguity and shipping fast</p><p style="min-height:1.5em"></p></li></ul><h3><strong>⚙️ Our tech stack</strong></h3><p style="min-height:1.5em">Our stack is designed to support <strong>AI-first workflows</strong> and <strong>production reliability</strong>.</p><ul style="min-height:1.5em"><li><p style="min-height:1.5em"><strong>Backend &amp; Frontend:</strong> TypeScript, Node.js, React, tRPC</p></li><li><p style="min-height:1.5em"><strong>Infrastructure:</strong> AWS (Terraform)</p></li><li><p style="min-height:1.5em"><strong>Data &amp; AI:</strong> Mastra, Bedrock</p></li><li><p style="min-height:1.5em"><strong>Database:</strong> Postgres</p></li></ul><p style="min-height:1.5em"><em>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.</em></p><p style="min-height:1.5em"></p><h3><strong>💎 What we offer</strong></h3><ul style="min-height:1.5em"><li><p style="min-height:1.5em"><strong>Build alongside a strong AI expert:</strong> Work closely with <a target="_blank" rel="noopener noreferrer nofollow" href="https://www.linkedin.com/in/alexandredeboutray/">Alexandre</a>, our CTO, who has deep expertise in AI agents, and turn cutting-edge AI into production systems.</p></li><li><p style="min-height:1.5em"><strong>Ownership &amp; Impact:</strong> As the second engineering hire, you'll have real influence on the product and technical direction</p></li><li><p style="min-height:1.5em"><strong>Bring AI to real users:</strong> Build production AI systems that solve real problems in a complex, high-stakes domain</p></li><li><p style="min-height:1.5em"><strong>Hexa ecosystem:</strong> Access to expertise, resources, and network from one of Europe's leading startup studios</p></li><li><p style="min-height:1.5em"><strong>Competitive package:</strong> Attractive salary + meaningful equity</p></li><li><p style="min-height:1.5em"><strong>Paris-based team:</strong> Work alongside the founding team in our office</p></li><li><p style="min-height:1.5em"><strong>Growth:</strong> Opportunity to grow into a technical leadership role as the team scales</p><p style="min-height:1.5em"></p></li></ul><p style="min-height:1.5em"><em>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.</em></p><p style="min-height:1.5em"><em>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.</em></p><p>Find more <a href="https://www.arbeitnow.fr/english-speaking-jobs">English Speaking Jobs in France</a> on Arbeitnow</a>