Speak

A superhuman, AI-powered language tutor in your pocket

Senior Backend Engineer

$170K - $280K San Francisco Job type Full-time Role Engineering, Full stack Experience 6+ years Visa US citizen/visa only Apply to Speak and hundreds of other fast-growing YC startups with a single profile.

About the role

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 looking for a senior backend focused but full-stack capable engineer to work on building 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
• Full-stack engineering but focused on creating scalable backend systems.
• Debugging complex streaming issues.
• 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

• 5+ years of industry experience working as a Backend Engineer preferably in a fast-paced startup environment.
• Excellent problem-solving and communication skills and the ability to work independently or as part of a team.
• Coach and mentor other engineers.
• Strong product sense: ability to think broadly/cross-functionally about product experiences.

Why work at Speak

Join a fantastic team passionate about education technology.

1. Work on cutting-edge AI technology impacting millions worldwide.
2. Competitive compensation package including equity.

Opportunity for career growth in an innovative startup environment.