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Open nowPosted 56 days ago

Founding Full-stack Software Engineer

Lemrock8 open roles

Where
Paris
Work mode
Hybrid
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Your applicationOpen nowFounding Full-stack Software EngineerLemrock · Paris

  1. YouYes, apply to this one.

  2. CV RocketCV written for this posting.

  3. 25 readersRecruiter, hiring manager, skeptic. Round after round.

  4. CV RocketApplied on Lemrock's own form.

The reply lands in your private mailbox

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The clock on this job

Early applications get read.

11.5% of postings close within 7 days. Measured by our own scanner across the market.

Share of postings closed within
  1. 2.1%1 day
  2. 4.4%3 days
  3. 11.5%7 days
  4. 18.1%14 days
  5. 35.6%30 days
  6. 44.6%60 days
This job: posted 56 days ago

The posting

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.

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One press. We do the rest.

  1. A CV for this posting

    Written against Lemrock's own wording, from every piece of relevant proof in your profile.

  2. 25 readers review it

    Recruiter, hiring manager, skeptic and more read every draft, round after round. You get the best round.

    The review screen in CV Rocket: how each CV was read, round by round.

  3. We apply on Lemrock's form

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    An application in CV Rocket: every answer filled in on the employer's form.

  4. Every reply, sorted

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