Senior iOS Engineer

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

As an iOS Engineer on Speak’s engineering team, you will be responsible for a variety of areas including improving how we serve our content, run A / B tests on monetization features, and supporting the launching of new markets and new languages. You will collaborate closely with backend engineers and our partners in Product and Design. You’ll be responsible for shipping product features to millions of users.

What you’ll be doing

• Improve “freemium” experience to increase conversions
• Support the launching of new markets and new languages
• Implement various paywall tests, such as pricing, design changes, delayed paywalls, discounted offers, etc.
• Improve our speech‑to‑text system
• Improve our audio and video streaming systems

What we’re looking for

5+ years of industry experience working as a Mobile Engineer, preferably in a fast‑paced startup environment

Proficiency in Swift, with a strong understanding of common mobile architectures including MVC / MVVM

Office

Why work at Speak

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.

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