Founding Full-stack Software Engineer
Who we are Lemrock builds the infrastructure of agentic commerce. Tomorrow, consumers won't just buy on e-commerce websites. They will discover, compare and purchase directly inside conversational AI interfaces like ChatGPT, Perplexity, and a growing long tail of specialized AI assistants. For brands, this is a major shift: if they are not present in these environments, they become invisible. Our mission: enable any brand to exist, sell and distribute in this new channel. We raised a €7M seed round (the first in Europe on this market), with Jean-Baptiste Rudelle, founder of Criteo, on our board, and the Bpifrance DeepTech label. Today, Lemrock is already: 100M+ conversations per month
150+ brand clients
a $100B market structuring at high speed
Context You'll join a small, high-ownership engineering team building production systems that serve millions of users. We care deeply about code quality and clean architecture — and we intend to keep it that way as we scale. Your Mission Your goal is to build and ship the product that powers Lemrock's commerce infrastructure — with full ownership, from design to production. Concretely, you will: Ship features end-to-end that reach millions of users — from data model and API design to the interface they interact with.
Scale and harden our backend as traffic, integrations, and product complexity grow.
Shape the architecture of the codebase — enforce clean boundaries, maintain modularity, and make decisions that compound as the team scales.
Move fast across the stack — backend, frontend, infra, data — wherever the highest-impact work is on any given week.
Candidate Profile Strong academic background, proven professional track record, or hands-on entrepreneurial experience
2+ years of hands-on software engineering experience
Deep proficiency in TypeScript
Experience with structured backend architectures (DDD, hexagonal, or similar)
Has owned features end-to-end: data model → API → frontend → deployment
Comfortable with AI coding tools (Cursor, Claude Code)
Thrives in ambiguity and 0-to-1 environments — ex-founders or entrepreneurial mindsets are a strong fit
Professional proficiency in French & English
Tech Stack Core (required) TypeScript, NestJS, React
PostgreSQL, Redis
Docker
Clean architecture patterns (hexagonal, ports & adapters)
Bonus (appreciated but not required) GCP (Cloud Run, Pub/Sub, BigQuery), Terraform
Vector databases, embeddings, LLM integrations
Domain-Driven Design (DDD), CQRS
TanStack (Router, Query, Table), shadcn/ui, Tailwind, Vite
Durable workflows (Inngest, Temporal)
Why Join Us Join a company in early breakout mode , already generating revenue, with a clear technological edge and strong financial backing to fuel its growth
Work directly with an experienced team : two repeat YC founders who've scaled product & tech before, a former strategy/innovation director (10 years in the sector), and ex-strategy consultants (McKinsey QuantumBlack, BCG)
Be part of the next structural shift of the web — agentic interfaces
Own mission-critical topics , grow fast, and shape the company's future trajectory
Package Competitive salary + equity, disclosed during the interview process. Find more English Speaking Jobs in France on Arbeitnow