AI-powered language learning platform that provides conversation-first experience with instant feedback, serving learners across 15+ languages.

Speak is revolutionizing language learning through AI-powered tutoring, serving as the #1 language learning app in South Korea and expanding globally across 15+ languages. With over $150M in venture funding from prestigious investors like OpenAI, Accel, Founders Fund, and Khosla Ventures, Speak operates with a distributed team across San Francisco, Seoul, Tokyo, Taipei, and Ljubljana.

As a Senior Android Engineer, you'll be integral to Speak's engineering team, working on crucial features that impact millions of users. Your responsibilities will include improving content delivery, implementing A/B tests for monetization, and supporting new market launches. You'll collaborate closely with backend engineers, product teams, and designers to build growth loops, enhance user acquisition and retention, and improve core systems like text-to-speech and audio/video streaming.

The ideal candidate brings 5+ years of industry experience in mobile engineering, preferably with exposure to apps serving 1M+ users. Strong proficiency in Kotlin and modern mobile architectures is essential, with bonus points for Jetpack Compose and mobile streaming technologies experience. You'll need expertise in reactive programming, mobile build practices, and Google Play Billing, along with excellent problem-solving and communication skills.

Join Speak at an exciting growth phase where individual contributions can significantly impact the company's trajectory. You'll work with a tight-knit, talented team across global offices, directly contributing to helping millions achieve their language learning goals. The company offers competitive compensation ($180K-$220K plus equity) and values diversity, creating an inclusive environment for all team members.

Senior Android Engineer position at Speak, building AI-powered language learning platform, offering $180K-$220K plus equity in San Francisco.

Senior Android Engineer

AI-powered language learning platform that provides conversation-first experience with instant feedback, helping learners progress from beginner to confident speaker across multiple languages.

Speak is revolutionizing language learning through AI-powered tutoring, having raised over $150M from prestigious investors including OpenAI, Accel, Founders Fund, and Khosla Ventures. As the #1 language learning app in South Korea, they're expanding globally across 15+ languages. They're seeking an experienced Machine Learning Engineer to develop cutting-edge speech recognition models for language learning. The role involves end-to-end ownership of modeling pipelines, from training to deployment, and close collaboration with Product teams to create innovative learning experiences. The position offers the opportunity to work with a dynamic team on ASR, assessment, pronunciation, and content personalization projects. The company maintains offices in San Francisco, Ljubljana, Seoul, and Tokyo, providing a truly global work environment. They offer competitive compensation ($170K-$280K plus equity) and the chance to make a significant impact on millions of learners worldwide. The ideal candidate should have strong experience in deep learning, Python proficiency, and excellent communication skills. This role presents an exciting opportunity to join at a crucial growth phase and contribute to transforming how people learn languages globally.

Senior ML Engineering role at Speak focusing on speech recognition and language learning, offering $170K-$280K plus equity in San Francisco.

Applied ML Engineer, Speech

AI-powered language learning platform that provides personalized tutoring through conversation-first experience, serving learners across 15+ languages.

Speak is revolutionizing language learning through AI-powered tutoring, serving over 40 countries with offices in San Francisco, Ljubljana, Seoul, and Tokyo. As an Applied ML Engineer focusing on LLMs, you'll be at the forefront of developing innovative language learning solutions.

Your role involves the entire ML lifecycle, from ideation to deployment, creating novel LLM product experiences. You'll work on building a Knowledge Graph for tracking learner progress, developing dynamically-generated personalized lessons, and enhancing AI-powered features.

The company has secured over $150M in venture funding from prestigious investors including OpenAI, Accel, Founders Fund, and Khosla Ventures. Since its 2019 launch in South Korea, Speak has become the #1 language learning app there and now serves learners across 15+ languages.

This is an exciting opportunity to join during a period of rapid growth following their Series C funding. The role offers the chance to make a significant impact on the company's direction while working with a tight-knit, talented team. You'll be part of a mission to help millions achieve their language learning goals through innovative AI solutions.

The position offers competitive compensation ($170K-$280K plus equity) and the opportunity to work with a global team. Speak values diversity and maintains a collaborative culture focused on continuous learning and growth. The hybrid work arrangement in San Francisco provides flexibility while maintaining team connectivity.

Applied ML Engineer position at Speak, focusing on developing LLM-based language learning solutions with competitive compensation and equity.

Applied ML Engineer, LLM

Speak is building a human-level, AI-powered language learning tutor that enables conversation-first experience across multiple languages.

Speak is revolutionizing language learning through AI-powered tutoring technology. As the #1 language learning app in South Korea since 2019, Speak now serves learners across 40+ countries in 15+ languages. With over $150M in venture funding from prestigious investors like OpenAI, Accel, Founders Fund, and Khosla Ventures, Speak operates globally with offices in San Francisco, Seoul, Tokyo, Taipei, and Ljubljana.

As an Android Engineer, you'll be at the forefront of developing and improving crucial features that impact millions of users. Your responsibilities will include enhancing content delivery, implementing A/B tests for monetization, supporting new market launches, and optimizing audio and video streaming systems. You'll work closely with backend engineers, product managers, and designers to build growth loops, improve user acquisition and retention, and refine pricing strategies.

The ideal candidate brings 3+ years of mobile engineering experience, preferably from a fast-paced startup environment. Strong proficiency in Kotlin and modern mobile architectures is essential, with bonus points for Jetpack Compose and mobile streaming technologies expertise. You'll need solid understanding of reactive programming, mobile build practices, and Google Play Billing.

Working at Speak offers unique opportunities: you'll join at a pivotal growth phase, work with an exceptional team, engage with a global product, and make a meaningful impact on people's lives through language learning. The company provides competitive compensation ($120K-$200K plus equity) and values diversity and inclusion in its hiring practices.

This hybrid role is based in San Francisco, offering the perfect blend of collaborative office culture and flexible work arrangements. You'll be part of a mission-driven team helping millions achieve their language learning goals through innovative technology.

Android Engineer position at Speak, building AI-powered language learning app, offering $120K-$200K plus equity, hybrid work in San Francisco.

Android Engineer

AI-powered language learning platform that provides conversation-first experience with instant feedback, serving learners across multiple markets and 15+ languages.

Speak is revolutionizing language learning through AI-powered tutoring, serving as the #1 language learning app in South Korea and expanding globally. With over $150M in venture funding from prestigious investors like OpenAI, Accel, and Founders Fund, we're on a mission to make language learning accessible and effective.

As a Senior Backend Engineer at Speak, you'll be at the forefront of developing novel AI-powered product experiences. This role combines backend expertise with full-stack capabilities, focusing on creating scalable systems and working closely with product, design, and machine learning teams. You'll be instrumental in building our programmatic, conversationally-driven language learning products.

We offer a unique opportunity to:
- Work with a fantastic, tight-knit team during a period of rapid growth
- Collaborate with dedicated offices in San Francisco, Ljubljana, Seoul, and Tokyo
- Make a significant impact on millions of users' lives through innovative language learning solutions
- Join post-Series C with strong product-market fit and top-tier investors

The ideal candidate brings 5+ years of backend engineering experience, preferably in fast-paced startups, with bonus points for experience with apps serving 1M+ users. You'll need excellent problem-solving skills, strong product sense, and the ability to mentor other engineers.

Benefits include competitive salary, equity, and the chance to work with a global team that's passionate about transforming language learning through technology. Join us in making language learning accessible and effective for the 2 billion people trying to learn a new language.

Senior Backend Engineer position at Speak, building AI-powered language learning experiences with competitive compensation $170K-$280K plus equity.

Senior Backend Engineer

AI-powered language learning platform that provides conversation-first experience for learning multiple languages

Speak is revolutionizing language learning through AI-powered tutoring, serving over 40 countries with support for 15+ languages. As an AI Product Engineer, you'll be at the forefront of developing innovative language learning experiences using Language Learning Models (LLMs).

The role involves full-stack development, from evaluating models and testing prompts to creating conversational onboarding, lesson experiences, grammatical assessment, and personalized learning features. You'll work with cutting-edge LLM technology to serve millions of users worldwide.

Speak has raised over $150M from prestigious investors including OpenAI, Accel, Founders Fund, and Khosla Ventures. The company has achieved product-market fit and is experiencing rapid growth, with offices in San Francisco, Seoul, Tokyo, Taipei, and Ljubljana.

The position offers competitive compensation ($170K – $280K plus equity) and the opportunity to make a significant impact on global education. You'll join a tight-knit team during a period of explosive growth, working with talented individuals across multiple international offices.

Key benefits include:
- Equity participation
- Global work environment with offices in multiple countries
- Opportunity for international travel
- Collaborative culture focused on personal growth
- Chance to impact millions of lives through language education

The ideal candidate will have 3-5+ years of full-stack/backend experience, strong proficiency in React/Node/TypeScript and Python, and real-world experience with LLM applications. You should possess strong product intuition and the ability to work independently at high velocity.

Join Speak to be part of a mission to change lives by making language learning accessible and effective for everyone.

Senior AI Product Engineer position at Speak, developing LLM-powered language learning products with competitive compensation and equity.

AI Product Engineer

A superhuman, AI-powered language tutor in your pocket

**About us**

Our mission is to reinvent the way people learn, starting with language. We begin by teaching the next billion people English, Spanish, and French.

English is the global language of business, culture, and communication, and over 1.5 billion people around the world are actively trying to learn right now. Others dream of communicating with the half-billion native Spanish speakers across the globe. The problem is that it's nearly impossible to learn to *speak* a language without constant access to a speaking partner. Grammar and vocab apps don't really help – you need to actually *converse* with someone.

Speak is on a journey to fix this. We're creating an AI-powered experience that replicates the flow of a conversation, *without* needing a human on the other end. The goal is to make it radically more accessible to be able to have conversations in a foreign language and eventually help hundreds of millions of people gain fluency who otherwise wouldn't be able to.

As an MLE at Speak, you'll play a pivotal role in developing the future of language learning and creating the most effective path to language fluency. Your primary responsibility will be to spearhead new proofs-of-concept and experiment creatively to help push the boundaries of truly personalized language learning.

Your tasks will span the entire ML lifecycle, from ideation and experimentation to implementation and deployment. You'll bring the rigor of ML applied research to building out novel LLM product experiences to create new lesson types, to improve assessment/feedback, and to provide a continuously personalized learning experience to users.

We're constantly pushing the boundaries of what LLMs can do to provide an exceptional and unparalleled language learning experience to users in over 30 countries worldwide.

**Why work at Speak:**

1. **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.

2. **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.

3. **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.

4. **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.

Senior ML Engineer role at Speak, focusing on developing AI-powered language learning experiences using LLMs

**About us**

Our mission is to reinvent the way people learn, starting with language. We begin by teaching the next billion people English, Spanish, and French.

English is the global language of business, culture, and communication, and over 1.5 billion people around the world are actively trying to learn right now. Others dream of communicating with the half-billion native Spanish speakers across the globe. The problem is that it's nearly impossible to learn to *speak* a language without constant access to a speaking partner. Grammar and vocab apps don't really help – you need to actually *converse* with someone.

Speak is on a journey to fix this. We're creating an AI-powered experience that replicates the flow of a conversation, *without* needing a human on the other end. The goal is to make it radically more accessible to be able to have conversations in a foreign language and eventually help hundreds of millions of people gain fluency who otherwise wouldn't be able to.

We started on this journey over five years ago and we've still got a long ways to go. We're thoughtfully adding new team members only when we think they can truly play a big role in our mission.

As an Android Engineer on Speak's engineering team, you will be responsible for a variety of features including improving how we serve our content, run A/B tests on monetization features, support 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.

The company is well funded, and as of December 2024, we've reached a $1B valuation with our Series C round, through key partners like Accel, OpenAI, Founders Fund, Y Combinator, Khosla Ventures, Lachy Groom, Josh Buckley, and more. We're a team of more than 90 based throughout San Francisco, Seoul, Tokyo, Taipei, and Ljubljana.

**Why work at Speak:**

1. **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.

2. **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.

3. **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.

4. **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.

Senior Android Engineer position at Speak, developing AI-powered language learning features and working on mobile app development.

AI-powered language tutor app helping people learn English, Spanish, and French through conversational practice

Speak is revolutionizing language learning through AI-powered conversation technology. As an Applied ML Engineer focused on Speech, you'll join a mission-critical team developing cutting-edge speech recognition models to help millions achieve language fluency.

The role involves end-to-end ownership of ML pipelines - from training and experimenting with ASR models to deployment and monitoring. You'll work closely with Product teams to design innovative learning experiences and measure model efficacy. Key responsibilities include improving pronunciation feedback systems, creating cross-language ASR performance metrics, expanding to new languages, and building robust data infrastructure.

We're looking for someone with extensive experience training large models on GPUs and deploying custom deep learning models. You should be proficient in Python and frameworks like PyTorch, with demonstrated success owning ML pipelines from POC to production. Strong communication skills are essential as you'll need to explain complex ML concepts to non-technical stakeholders.

The company has achieved significant milestones - becoming the top grossing education app in South Korea, expanding to 40+ countries, and reaching a $1B valuation with our Series C round backed by Accel, OpenAI, Founders Fund, Y Combinator and others. With offices in San Francisco, Ljubljana, Seoul, and Tokyo, we offer a truly global opportunity to impact millions of language learners worldwide.

This is an exciting time to join as we scale our AI capabilities and expand to new markets. You'll be part of a tight-knit team where individual contributors can significantly influence the company's direction. We value craft, growth, and working with people we admire. The mission is meaningful - helping the 99% of language learners who currently struggle to achieve their goals due to lack of conversation practice.

We're looking for someone who combines technical excellence with product intuition - someone who can think broadly about model quality in the context of user experience. If you're excited about applying cutting-edge ML to help millions learn languages more effectively, we'd love to talk.

Applied ML Engineer position at Speak, developing speech recognition and language learning AI models

Speak is revolutionizing language learning through AI technology, having recently achieved a $1B valuation with their Series C round. As an AI Product Engineer, you'll be at the forefront of developing innovative language learning solutions powered by Large Language Models (LLMs).

The role combines full-stack engineering with AI/ML expertise, focusing on creating and enhancing LLM-powered features that serve millions of users across 40+ countries. You'll be working on conversational onboarding, lesson experiences, grammatical assessment, and personalized learning systems.

The company has strong backing from prestigious investors including Accel, OpenAI, Founders Fund, Y Combinator, and Khosla Ventures. With a team of 90+ spread across global offices in San Francisco, Seoul, Tokyo, Taipei, and Ljubljana, you'll be part of an international environment making a real impact on how people learn languages.

The ideal candidate brings 3-5+ years of full-stack engineering experience, strong product intuition, and a passion for AI/ML technologies. Experience with LLM applications and operations is highly valued. You'll work independently while collaborating with cross-functional teams including Engineering, Applied ML, Product, Design, and Content.

This is an opportunity to join at a pivotal time - post product-market fit and during rapid growth - where individual contributions can significantly influence the company's trajectory. The role offers the chance to work on meaningful technology that helps millions achieve language fluency, with competitive compensation ranging from $140K to $250K.

Working at Speak means joining a thoughtfully curated team that values craft and growth, with the opportunity to make a lasting impact on global education through cutting-edge AI technology. The company maintains a strong focus on product quality and user impact, with their app already achieving top grossing status in the education category in South Korea.

AI Product Engineer role at Speak, developing LLM-powered language learning products and features for a rapidly growing edtech startup.

Speak Engineering Jobs

AI-powered language learning platform that provides conversation-first experience with instant feedback, serving learners across 15+ languages.