Full-stack Engineer

About the role

This is an extraordinary moment to join us. We're in the middle of a fundamental agentic shift in software development, and are embracing the change. We're operating in an agentic-first world, where the role of a builder is shifting from writing every line of code to designing systems that build, test, and improve themselves. At Speak, you'll use AI agents as core collaborators in your day-to-day workflow—helping you move faster, explore more ideas, and focus on the highest-impact problems. That means embracing ambiguity, iterating quickly, and working fluidly across functions—not just within a single discipline.

Responsibilities

• Building novel AI-driven product experiences and user interfaces on the web
• Owning the entire development cycle of features, from conception to production

Requirements

• 4+ years of experience building highly polished web-based product experiences, including extensive experience with React
• Experience using coding agents (e.g. Claude Code, Codex, Cursor) as core collaborators in your day-to-day workflow— not just as autocomplete, but as active partners in designing, testing, and shipping
• Appreciate balancing doing things the "right way" but also can build things scrappily if necessary
• Enjoy shipping things quickly and frequently
• Excellent communicator and enjoy collaborating with people across all functions

Qualifications

• Mid, senior, or staff level experience in engineering

Skills

• React
• Experience with coding agents

Benefits

• 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

Pay

• Competitive compensation package

Schedule

• Full-time

About Speak

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. 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.