Staff Engineer - Fullstack JS/TS

About lemlist lemlist is a global B2B SaaS business with one mission: help any business grow . We’re doing $50M+ ARR , while being: Bootstrapped & profitable 145 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 ($45M ARR, growing +60% YoY) Social selling with Taplio & Tweet Hunter ($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, 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 Self-taught hacker or side-project builder Passionate about experimenting & creating beyond work Package 70-75K€ 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)