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Lemrock builds infrastructure for agentic commerce—enabling brands to sell directly within conversational AI interfaces like ChatGPT and Perplexity. The company has raised a €7M seed round backed by Jean-Baptiste Rudelle (founder of Criteo) and holds the Bpifrance DeepTech label. Currently serving 100M+ conversations monthly across 150+ brand clients in a rapidly structuring $100B market.
You will join a small, high-ownership engineering team building production systems at scale. The role offers full end-to-end ownership: design, implementation, and production deployment of features reaching millions of users.
Key Responsibilities:
- Ship features end-to-end across the stack (data model, API design, frontend, deployment) that reach millions of users
- Scale and harden the backend as traffic, integrations, and product complexity grow
- Shape codebase architecture—enforce clean boundaries, maintain modularity, and make decisions that compound as the team scales
- Move fast across backend, frontend, infrastructure, and data layers wherever highest-impact work exists
- Work with an experienced team including two repeat YC founders, a former strategy/innovation director (10 years in sector), and ex-strategy consultants from McKinsey QuantumBlack and BCG
Tech Stack (Core Required):
TypeScript, NestJS, React, PostgreSQL, Redis, Docker, clean architecture patterns (hexagonal, ports & adapters)
Tech Stack (Bonus):
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)
Requirements:
- 2+ years of hands-on software engineering experience
- Deep proficiency in TypeScript
- Experience with structured backend architectures (DDD, hexagonal, or similar)
- Proven ability to own 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 and English
- Strong academic background, proven professional track record, or hands-on entrepreneurial experience
