Technical Lead - Fullstack JS/TS

About lemlist lemlist is a global B2B SaaS business with one mission: help any business grow . We’re doing $54M+ ARR , while being: Bootstrapped & profitable, giving us freedom and independence 170 people, remote-friendly, agile 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 Tech Lead or a Senior Fullstack TypeScript Developer to join our team. 👉 The role starts as a Senior Developer, then evolves into a Tech Lead position after 3-6 months, once you’ve proven yourself in the squad. You’ll design, build, and ship features across frontend and backend, improve performance, and progressively take leadership within your squad to set technical standards, 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 in your squad: drive quality, make technical choices, and align delivery 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 Within 6 months You’ve led delivery of multiple successful projects You’ve had direct impact on scalability & performance You’ve grown into your Tech Lead role 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 8+ years in TypeScript / JavaScript (frontend + backend) Solid skills in Node.js, React, MongoDB Proven track record building & maintaining web apps Always hungry to learn more, particularly around JS/TS Autonomous, fast learner, and collaborative Fluent in French & English, based in French timezone (+/- 2h) Nice to have B2B SaaS startup experience You worked on a SaaS that scaled massively You are familiar with advanced performance optimization Self-taught hacker or side-project builder Passionate about experimenting & creating beyond work Package 65 - 75K€ fixed + 18K€ bonus 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 Interview with Lucas (TAM) Technical interview with Corentin (VP of Engineering) Technical interview with Mickael (CTO) Final chat with Charles (CEO)