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lemlist Tech Stack

AI-powered sales engagement platform for B2B outbound at scale

Software Development New York, NY 51–200 employees Founded 2018 Privately Held
lemlist.com LinkedIn

lemlist operates a sales engagement platform combining prospecting, data enrichment, AI personalization, and multichannel outreach — with Salesforce and HubSpot sync built in. The stack reveals heavy ML investment (LangChain, PyTorch, Transformers, SentenceTransformers) alongside core Node/TypeScript backend and React frontend, signaling a shift toward AI-driven personalization at the core product. Current hiring skews sales (7 roles) over engineering (4), with explicit focus on scaling the US sales-led motion, while internal pain points center on growth predictability and revenue retention — classic indicators of a PLG-to-sales-led transition.

Tech Stack 26 technologies

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

What lemlist Is Building

◆Challenges

  • Net revenue retention
  • Scalability and performance
  • Video as production function
  • Moving faster on projects
  • Executing high-stakes initiatives
  • Growth not engineered
  • Growth not predictable
  • Growth not scaled
  • Structuring a sales force
  • Acquiring high-quality customers

▲Active Projects

  • React migration
  • Define partner playbook
  • Codebase refactoring
  • Video content for product launches
  • Video content for growth initiatives
  • Video content for employer brand
  • Market intelligence
  • Pricing scenarios
  • End-to-end feature development
  • Scale us sales-led motion

Hiring Activity

Accelerating20 roles · 10 in 30d

Department

Sales
7
Engineering
4
Marketing
2
Ops
2
Product
1
Support
1

Seniority

Senior
6
Manager
3
Mid
3
Junior
2
Intern
1
Lead
1
Staff
1

Notable leadership hires: Video Content Lead, Growth Lead

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About lemlist

lemlist is a B2B sales engagement platform built for outbound prospecting and multichannel outreach. The product layers prospect data enrichment, AI-powered message personalization, and intent signals on top of email and multitouch orchestration, with deep integrations into Salesforce and HubSpot. Founded in 2018 and based in New York with 51–200 employees, the company operates across the US, Europe (France, Bulgaria), and South America (Colombia). Active projects signal operational focus on scaling sales execution (US sales-led motion, sales force structuring) and engineering velocity (React migration, codebase refactoring), alongside new content production infrastructure for product marketing.

HeadquartersNew York, NY
Company Size51–200 employees
Founded2018
Hiring MarketsFrance, Colombia, United States, Bulgaria

Frequently Asked Questions

What is lemlist's tech stack?

Backend: Node.js, TypeScript, MongoDB. Frontend: React. Data/ML: Python, LangChain, PyTorch, Transformers, SentenceTransformers, Snowflake, BigQuery, dbt. Infrastructure: Docker, Jenkins, Airflow, GCP. CRM: Salesforce, HubSpot. Other: Slack, Notion, Figma, Stripe.

What countries does lemlist hire in?

lemlist actively recruits in the United States, France, Bulgaria, and Colombia — spanning North America, Europe, and South America.

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.