Staff Engineer - Fullstack JS/TS

Posted 5 Days Ago
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Paris, Île-de-France, FRA
Hybrid
75K-90K Annually
Expert/Leader
Information Technology • Software • Automation
The Role
Build and maintain full-stack web features using JavaScript and TypeScript, improve performance and code quality, solve complex technical problems, mentor engineers, and lead technical initiatives. The role works across frontend and backend systems, contributes to scalability, collaborates with Product and Engineering teams, and drives successful project delivery in a remote-first B2B SaaS environment.
Summary Generated by Built In
About lemlist

lemlist is a global B2B SaaS business with one mission: help any business grow.

We’re doing 60M+ ARR, while being:

  • Bootstrapped & profitable

  • 170 people, remote-friendly, agile

  • Majority-owned by our founder Guillaume Moubeche, giving us freedom and independence

We run two product lines:

  • Sales Engagement with lemlist & Claap ($50M ARR, growing +60% YoY)

  • Social selling with Taplio & Tweet Hunter ($4.5M ARR)

Our ambition: become a world-class giant in Sales Tech.

Our mantra: Keep growing.

About the role

We’re looking for a Staff Engineer to join our team.

You’ll design, build, and ship features across frontend and backend, improve performance, and progressively take leadership on more transversal topics, mentor peers, and drive delivery.

What you’ll do
  • Build new features end-to-end (frontend + backend) by working hand-in-hand with a strong Product team

  • Improve the codebase (refactoring, bug fixes, optimization)

  • Collaborate with the rest of the team to solve technical issues

  • Mentor fellow developers, share knowledge, and raise the bar

  • Step up as Tech Lead on specific topics: drive quality, make technical choices, and align delivery

  • Solve difficult problems that impact 10,000s of customers every day

What success looks like

Within 3 months

  • You’re fully onboarded and comfortable in our stack

  • You’ve shipped meaningful features in production

  • You’ve contributed to improving our codebase

  • You've brought knowledge to the team that made other people improve

Within 12 months

  • You’ve led delivery of multiple successful projects

  • You’ve had direct impact on scalability & performance

  • You’ve grown into your an internal reference on some technical topics and mentor others

What’s in it for you
  • Join a bootstrapped, profitable, fast-growing SaaS company

  • Build products used by thousands of businesses worldwide

  • See your impact quickly with a very short feedback loop

  • Work with senior engineers who love to learn and share knowledge

  • Remote-first culture (office in Paris if you prefer 🇫🇷)

  • No endless meetings, high autonomy, big impact

About you

Must have

  • 10+ years in Software Engineering

  • 7+ years in JavaScript/TypeScript (frontend + backend)

  • Solid skills in Node.js, React, MongoDB

  • Proven track record building & maintaining web apps

  • Always hungry to learn more

  • Autonomous, fast learner, and collaborative

  • Fluent in French & English, based in French timezone (+/- 2h)

Nice to have

  • B2B SaaS startup experience

  • Self-taught hacker or side-project builder

  • Passionate about experimenting & creating beyond work

Package
  • 75-90K€ base salary

  • Profit sharing: when lemlist wins, you win too

  • Full perks: Alan Blue (healthcare) 100% taken care of for you and your family, Swile meal vouchers, 100% of your Navigo card, MacBook Pro & remote setup budget

  • Annual global team retreat in amazing locations 🌍

Recruitment process
  1. Interview with Lucas (TAM)

  2. Technical interview with Corentin (VP of Engineering)

  3. Technical interview with Mickael (CTO)

  4. Final chat with Charles (CEO)

Skills Required

  • 10+ years of experience in Software Engineering
  • 7+ years of experience with JavaScript and TypeScript across frontend and backend development
  • Solid skills in Node.js
  • Solid skills in React
  • Solid skills in MongoDB
  • Proven track record building and maintaining web applications
  • Fluent in French and English
  • Based in the French timezone, plus or minus 2 hours
  • B2B SaaS startup experience
  • Self-taught hacker or side-project builder experience
  • Passion for experimenting and creating beyond work
Am I A Good Fit?
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The Company
HQ: Paris
151 Employees
Year Founded: 2018

What We Do

lemlist is your go-to tool for business growth, trusted by over 37,000 businesses in more than 100 countries. The multi-channel prospecting platform allows you to discover your next buyers from a B2B database of 450M+ contacts, obtain their verified emails, and create effective campaigns with AI. All-in-one solution, no need for 3rd party tools, technical skills or extensive outreach experience.

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