Founding AI Engineer @Plato (backed by Hexa)

Hexa · Parisjunior

En corto

▸Ingeniero de IA fundador en una startup que construye un sistema operativo de IA para abogados de litigio.
▸Trabajas en la frontera del stack agente: creas flujos autónomos, procesas documentos legales y llevas prototipos a producción.
▸Eres clave desde el inicio: trabajas directamente con los fundadores, impactas usuarios reales y construyes sistemas que funcionan en producción.

No se requiere inglés, pero se menciona que el equipo trabaja con herramientas internacion

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¿Qué piden?

✓2+ años de experiencia en ingeniería de software o IA
✓Fundamentos sólidos en ingeniería de software, especialmente con TypeScript
✓Experiencia con agentes, evals o frameworks como LangChain, Mastra, Eve, Pydantic
✓Capacidad para llevar soluciones de IA de experimentación a producción
✓Mentalidad productiva: enfoque en impacto real del usuario
✓Autonomía, pragmatismo y capacidad para operar en entornos de alta ambigüedad

¿No cumplís todo? Es lo normal — tu dossier gratis te dice qué gaps tenés y cómo cubrirlos en la entrevista.

TypeScriptNode.jsReacttRPCAWSTerraformMastraBedrockPostgresLangChain

¿A quién escribirle en Hexa?

Tu dossier gratis identifica a las personas que te entrevistarían — con su background, qué valoran y cómo escribirles para destacar antes de aplicar.

⚖️ Who are we Plato is building the AI OS for litigation lawyers. 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. Our mission: Build the leading AI OS for litigation lawyers , enabling professionals to work 5x faster , by putting their whole firm on autopilot. 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. 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 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. Your mission You’ll work directly with Alexandre , our CTO, at the intersection of AI, software engineering and product . 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 reliable production systems . 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. Responsibilities Build AI-powered product features Design and ship AI features used directly by lawyers Be at the bleeing edge of the agentic stack: memory, sandboxes, code mode, lots of tools, subagents… Turn prototypes and experiments into production-ready feature Work with complex data Extract, structure and reason over large volumes of unstructured legal documents Build robust data and document-processing pipelines Experiment with different models and approaches to improve accuracy and reliability Make AI work in production Evaluate and improve agent outcomes through testing, evals and iteration Optimize systems for quality, latency and cost Build the backend services and infrastructure needed to run AI reliably at scale Shape the product Work directly with the founders and users to understand real-world problems Move quickly from problem → experiment → production (think days, not weeks) Take ownership of your projects from exploration to deployment 🤩 This role is for you if We're looking for a strong software or AI engineer with 2+ years of experience who wants to build real-world AI products at the forefront of the agentic stack. 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 a strong software engineering foundation , ideally with Typescript and experience shipping production systems Have experience with agents and/or evals and frameworks like Mastra, Eve, Pydantic, Langchain, etc… Can take an AI problem from experimentation to production Enjoy solving problems with no clear solution Have a strong product mindset and care about user impact Are autonomous and pragmatic , comfortable navigating early-stage ambiguity and shipping fast ⚙️ Our tech stack Our stack is designed to support AI-first workflows and production reliability . js, React, tRPC Infrastructure: AWS (Terraform) Data & AI: Mastra, Bedrock Database: Postgres 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 Build alongside a strong AI expert: Work closely with Alexandre , our CTO, who has deep expertise in AI a

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