Senior Full-stack Engineer at Speak (W17) $140K - $250K A superhuman, AI-powered language tutor in your pocket San Francisco Full-time US citizen/visa only 3+ years About Speak Speak is an AI English tutor on your phone that is the best way to become conversationally fluent in English. About the role Skills: React About us Our mission is to reinvent the way people learn, starting with language. Learning a language can change a life by opening doors to new cultures, careers, and communities. Two billion people around the world are actively trying to learn a language, but the best way to learn (one-on-one tutoring) is hard to access at scale and hasn’t been meaningfully improved in decades. Speak is building a human-level, AI-powered tutor in your pocket: a conversation-first experience that lets learners actually speak, get instant feedback, and progress through carefully designed lessons. The result is a complete path from beginner to confident speaker across multiple languages. Speak first launched in South Korea in 2019, where Speak has now become the number one language learning app, and we now serve learners across many markets and 15+ languages. Speak is one of the world’s leading AI companies, with over $150m raised in venture investment from OpenAI, Accel, Founders Fund, Khosla Ventures, and more, with a distributed team across San Francisco, Seoul, Tokyo, Taipei, and Ljubljana. About this role We are seeking a true full-stack engineer who is comfortable working across the stack. While initial projects may lean more toward the frontend, we expect this role to pivot into backend work as well, contributing to the development of novel AI-powered product experiences. The ideal candidate will have experience working in close coordination with product, design, and machine learning teams, as well as have a background in building polished consumer applications. This role sits at the center of developing our newest products focused on programmatic, conversationally-driven language learning and will be an instrumental contributor to the future of our company. What you'll be doing Building novel AI-driven product experiences and user interfaces on the web Owning the entire development cycle of features, from conception to production You'll be able to write code very quickly, ship frequently, and make a huge impact on our business by helping us scale our content What we're looking for 4+ years of experience building highly polished web-based product experiences, including extensive experience with React You appreciate balancing doing things the "right way" but also can build things scrappily if necessary You enjoy shipping things quickly and frequently You're an excellent communicator and enjoy collaborating with people across all functions We welcome applicants across all levels of engineering, including mid, senior, and staff. Office San Francisco, CA Why work at Speak Join a fantastic, tight-knit team at the right time: we're growing very quickly, we've most recently raised our Series C from some of the top investors in the valley, and we've achieved product-market fit in our initial markets. You'd join at a magical time when a single person could significantly change the course of the company. Do your life's work with people you’ll love working with: we care strongly about our craft and want every person at Speak to feel like they're growing every day. We believe in the idea that working with people you both enjoy and have respect for makes everything better. We hire thoughtfully and only work with people we admire deeply. Global in nature: We're live in over 40 countries and launching in a number of new markets soon. We have dedicated offices in San Francisco, Ljubljana, Seoul, and Tokyo, and you’ll have the opportunity to talk to users in each of these regions on a regular basis as well as travel. Impact people's lives in a major way: Learning a language is one of the single most life-changing skills one can learn, and right now 99% of people never achieve their goal because the process is broken. We’re helping millions of people achieve their goals and improve their lives. Speak does not discriminate based upon race, religion, color, national origin, gender (including pregnancy, childbirth, or related medical conditions), sexual orientation, gender identity, gender expression, age, status as a protected veteran, status as an individual with a disability, or other applicable legally protected characteristics. Technology iOS/Swift Android