Senior Fullstack TypeScript Developer (Product Engineer)

🚀 About lemlist lemlist is a global B2B SaaS business with the mission to help any business grow. We are doing over $54M in ARR while being: Bootstrapped Profitable A small, agile team of 170 highly talented people, remote-friendly Majority owned by an entrepreneur, Guillaume Moubeche, Founder & Chairman — which gives us maximum freedom We operate 2 business lines: Sales Engagement with our flagship products lemlist & Claap, generating $49.5M ARR and growing over 50% year over year Personal Branding with Taplio & Tweet Hunter, generating $4.5M ARR lemlist is a highly ambitious company that aims to become a world-class giant in the Sales Tech space. Our mantra: Keep growing – and we live by it every day. Job Description We're looking for a Senior Fullstack TypeScript Developer to join our team. You'll be responsible for designing and developing new features for our SaaS products. We need someone who is passionate, autonomous, and loves technical challenges. Your main missions will be: Design and develop new features from scratch, both on the frontend and backend, Independently developing new features that enhance user experience and increase product functionality. Stepping into the role of technical lead within your squad, driving excellence and setting standards. Improve the code base with refactoring, bug fixes, and optimization Work on multiple projects simultaneously Help the customer support team on technical issues, providing prompt and effective solutions Facilitating knowledge sharing and capacity building by training fellow developers, enhancing overall team competency and productivity. Key results Within 3 months you will have Successfully onboarded and integrated into the team Developed a deep understanding of our B2B SaaS products and their technical requirements Contributed to the development of new features and improvements to our existing code base Within 12 months you will have Played a key role in the development and delivery of multiple successful projects Made significant contributions to the optimization and scalability of our software products What’s in it for you? Work in a profitable, bootstrapped, and high-growth company that doesn’t rely on external funding to live. You will have the opportunity to make a lasting impact on a suite of products that are changing the game in multiple industries. Work with passionate senior engineers who share their knowledge and expertise Great ownership of your work. You will be part of a dynamic, innovative, and passionate team that respects autonomy and encourages individual input. No endless meetings Full remote policy You will grow professionally and personally, enhancing your technical skills and expanding your global network. Preferred Experience Must have You’re an expert in TypeScript / JavaScript with at least 7 years of XP You have a proven track record in building and maintaining web applications. You have a robust understanding of NodeJS and MongoDB , and ideally React You’re able to work independently and take ownership of complex projects You’re a fast learner You’re comfortable with the agile methodologies You like to communicate You like to work remotely, Gather, Slack and Notion are your best friends You are adaptable and like to discover new things and you can work on front-end integration, back-end development, mongo optimization, performance issues and more You speak French and English and you are in the French timezone Nice to have You have a first experience in B2B SaaS startup You are self-taught, you have been developing personal projects since you were a child or in the evenings and weekends. This is not mandatory but a big plus for us, we are all passionate about programming and like to create things, both at work and outside Additional Information Salary between 60K€ and 70K€ fixed salary + 18K€ bonus Where you live, and work is totally up to you – we do have an office in Paris if you enjoy life at the offi