Company profile

lemlist Tech Stack

Multichannel outbound sales engagement platform with AI-driven prospecting

Software Development Paris, Île-de-France 51–200 employees Founded 2018 Privately Held

lemlist builds outbound prospecting software on a Node.js, TypeScript, React and MongoDB core, with LangGraph, LangChain and SentenceTransformers pointing to agentic AI work on prospecting and pipeline generation. Hiring is accelerating with an engineering-led mix plus a sales push, matching a stated shift from product-led growth toward an outbound sales motion and a US sales playbook.

Tech Stack 28 technologies

Core StackNode.js TypeScript JavaScript MongoDB Slack React Figma Stripe BigQuery Python HubSpot Snowflake Salesforce LangChain PyTorch Docker Jenkins Apache Airflow Notion Codex LangGraph Storyblok Pennylane Holistics dbt Core GCP Transformers SentenceTransformers

What lemlist Is BuildingChallenges and projects from their job posts

◆Challenges

Transitioning from PLG to outbound sales engine
Scalability and performance under massive growth
Scaling the data platform
Controlling cost per pipeline
Reducing incident volume
Manual prospecting and pipeline generation

▲Active Projects

AI-native agentic system for prospecting and pipeline
AI evaluation and guardrails system
Context engineering system
High-performance outbound sales engine
US sales playbook
Codebase refactoring and current stack audit

Hiring Activity

Accelerating9 roles · 4 in 30d

Department

Engineering

Sales

Data

Product

Seniority

Senior

Mid

Junior

Staff

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About lemlist

lemlist is a Paris-based, privately held software company founded in 2018 that sells outbound sales tooling to sales teams. The platform covers targeting, verified contact discovery and multichannel engagement, accessible from the product itself, from a CRM, or through an AI assistant. The company employs 51–200 people and hires in France and Bulgaria. Its stack runs on GCP with BigQuery, Snowflake, dbt Core and Apache Airflow for data, and integrates with HubSpot and Salesforce.

HeadquartersParis, Île-de-France

Company Size51–200 employees

Founded2018

Hiring MarketsFrance, Bulgaria

Frequently Asked Questions

What tech stack does lemlist use?

lemlist uses Node.js, TypeScript, React and MongoDB on GCP, with BigQuery, Snowflake, dbt Core and Airflow for data, plus LangGraph, LangChain and PyTorch for AI work.

Is lemlist hiring engineers?

Yes. Hiring is accelerating and led by engineering, with additional roles in sales, data and product, mostly at senior and mid levels, in France and Bulgaria.

What is lemlist working on?

lemlist is building an AI-native agentic prospecting system with evaluation guardrails and context engineering, plus an outbound sales engine and a US sales playbook.

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How this profile is built

lemlist's technology stack, projects, and hiring signals are inferred from public hiring and company data — career pages, public listings, and company web presence — then clustered and de-duplicated. Figures are estimates that refresh over time. Read our full methodology →

This is not an official vendor or customer list. It is a technology-adoption signal inferred from public data, intended for B2B research.