---
title: 'Full-stack Engineer at Speak'
canonical: 'https://feeny.ai/job/full-stack-engineer-speak-san-francisco-z8ecxdk1xw63'
type: 'job'
last_seen: '2026-09-06'
---

# Full-stack Engineer at Speak

- **Company:** Speak
- **Location:** San Francisco, CA
- **Compensation:** $150k–$280k
- **Employment:** full-time
- **Work type:** hybrid
- **Posted:** 2026-08-10
- **Last confirmed live:** 2026-09-06
- **Apply:** https://jobs.ashbyhq.com/speak/de6ed95d-d237-4747-8e96-0aa790ec856d

## Job description

## 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’re looking for a senior full-stack engineer to serve as the hands-on technical lead for Discovery, the pod that helps motivated learners and small teams discover, try, and buy Speak. You’ll set technical direction across the web acquisition and purchase journey, including public discovery, authentication, checkout, billing, provisioning, and measurement. You’ll work primarily in TypeScript across Next.js/React, Node.js, and Postgres, partnering with engineers in adjacent pods where the experience crosses team boundaries.

You’ll turn business goals and product requirements into clear technical designs, lead execution across multiple engineers and agent-driven contributions, and raise the bar for architecture, reliability, analytics, and rollout. Near-term work includes self-serve Speak for Business onboarding, web payments experimentation, enterprise-ready web journeys, and foundations that let Marketing publish and measure experiments without depending on engineers for every change.

## WHAT YOU’LL BE DOING

- Serving as the hands-on technical lead for Discovery, from problem framing and architecture through implementation, launch, and production monitoring
- Designing and building full-stack web journeys that help individuals and small teams find, evaluate, purchase, and start using Speak
- Leading cross-repository integrations across authentication, payments, entitlements, analytics, attribution, CRM, and admin experiences
- Partnering closely with product, design, analytics, Marketing, Sales, and adjacent engineering pods to define scope, sequence dependencies, and deliver end-to-end outcomes
- Setting an enterprise-ready quality bar for privacy and security, payment correctness, observability, performance, and resilient rollouts
- Evolving architecture and development patterns incrementally while protecting conversion and revenue across high-traffic global funnels
- Helping the pod operate AI-natively by reviewing plans and designs before implementation, creating strong QA and verification loops, and enabling AI-assisted contributors to ship safely
- Mentoring engineers and raising the team’s bar for technical judgment, communication, and ownership

## WHAT WE’RE LOOKING FOR

- 6+ years of experience building high-quality, production-scale web applications, with strong proficiency in TypeScript, React, and Node.js
- A track record as the technical lead for ambiguous, multi-system initiatives, while remaining hands-on in architecture and implementation
- Experience designing APIs and backend services, working with relational data, and reasoning clearly about boundaries between systems
- Strong product and business judgment, with the ability to translate growth or B2B objectives into pragmatic scope, measurable outcomes, and durable technical foundations
- Experience building reliable transactional or stateful workflows, with strong instincts around data integrity, idempotency, observability, and safe rollouts
- Ability to balance building the right way with shipping quickly, learning from real usage, and improving systems incrementally
- Excellent cross-functional communication and a desire to mentor engineers and raise the quality of team decisions
- Excitement about AI-assisted development, paired with thoughtful verification and a high production-quality bar
- Nice to have:
- Deep experience with Next.js and Postgres data modeling
- Experience with web payments, subscriptions, billing, invoicing, or entitlements
- Familiarity with identity and access, B2B account models, roles, or provisioning
- Experience with analytics, attribution, experimentation, CRM, or marketing technology integrations
- Experience building internationalized web products or working across consumer and B2B SaaS surfaces

## 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, Tokyo, and Taipei, 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.

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.

## About Speak

## Company Overview
- **One-liner**: Speak is an AI-powered language learning app that focuses on teaching conversational fluency through real-time speaking practice and instant feedback, without needing a human tutor.
- **Entity Type**: Private (Series C; $1B valuation as of December 2024)
- **Headquarters**: San Francisco, California, USA (with offices in Seoul, Tokyo, Taipei, and Ljubljana)
- **Founded**: 2016
- **Founders**: Connor Zwick (CEO) and Andrew Hsu (CTO)

## Core Business
- **Industry**: Language learning / EdTech
- **Target Customers**: B2C (individual language learners) and B2B (Speak for Business – over 200 enterprise customers)
- **Mission/Purpose**: “To reinvent the way people learn, starting with language.” The goal is to make conversational practice radically accessible so that hundreds of millions of people can gain fluency.

## Products & Services
- **Speak App**: A subscription-based mobile and web application (iOS, Android, Web) that uses a proprietary “Speak Method” – learn useful phrases, practice them out loud with AI-driven drills, then apply them in simulated real-world conversations. Supports English learning from eight source languages; plans to add Spanish and French.
- **Speak for Business**: A B2B tier for companies that want to provide English conversation training to their employees, currently serving 200+ corporate clients.

## Market Standing
- **Valuation**: $1 billion (December 2024, Series C led by Accel)
- **Key Metric**: Total funding of $171.3 million across six rounds; annual revenue estimated at $7.0 million (LinkedIn data)
- **Notable Investors**: Accel, OpenAI Startup Fund, Founders Fund, Khosla Ventures, Y Combinator, Lachy Groom, Buckley Ventures; individual angels include Sam Altman and Peter Thiel.
- **Growth Signals**: 
  - 10M+ app downloads, #1 English learning app in South Korea
  - Available in over 30 countries
  - Headcount grew 30.9% YoY to 166 employees (LinkedIn, May 2026)
  - B2B segment has 200+ customers
  - Average user engagement of 10–20 minutes per day

## Competitive Advantages
- **Conversation-first approach**: Unlike grammar/vocab apps, Speak teaches by making users speak out loud, using proprietary speech recognition and generative AI to provide immediate feedback.
- **AI tutor that scales**: Replicates natural conversation without needing a live human, making high-quality practice affordable ($20/month or $99/year).
- **Deep OpenAI partnership**: Early access to the latest speech AI from OpenAI (also an investor), giving a technological edge in voice interaction.
- **Strong product-market fit in Asia**: Proven adoption in Korea, Japan, Taiwan, and expanding to other markets.

## Strategic Focus
- Expand target languages (Spanish and French are next)
- Scale Speak for Business globally
- Develop a standardized, accurate English fluency assessment (an AI-powered test)
- Continue to invest in AI research and engineering to improve tutoring effectiveness

## Why Work Here
- **Culture**: Mission-driven team passionate about language learning and AI; values efficacy over gamification.
- **Team & talent**: 166 people from companies like Meta, Google, DoorDash, Block, Dropbox, and Duolingo. Engineering office in Ljubljana, product and design hubs in San Francisco, operations in Seoul, Tokyo, Taipei.
- **Flexibility**: Hybrid/office-based across locations; employees encouraged to travel between offices; annual company offsite.
- **Perks**: Competitive salary and equity, comprehensive medical/dental/vision, unlimited PTO, parental leave, 401(k), monthly wellness and language learning stipends, pet-friendly office (official company dog).
- **Growth**: Rapidly scaling headcount (+30% YoY) with active roles in engineering, product, marketing, sales, and design.

## Sources
1. [speak.com/careers](https://www.speak.com/careers)
2. [speak.com](https://speak.com/)
3. [linkedin.com/company/usespeak](https://www.linkedin.com/company/usespeak)
4. [TechCrunch: OpenAI-backed Speak raises $78M at $1B valuation](https://techcrunch.com/2024/12/10/openai-backed-speak-raises-78m-at-1b-valuation-to-help-users-learn-languages-by-talking-out-loud/)
5. [Y Combinator: Speak](https://www.ycombinator.com/companies/speak)

## Other roles at Speak

- [Product Lead, Enterprise](https://feeny.ai/job/product-lead-enterprise-speak-san-francisco-pv45a3bsw3js) — San Francisco, CA
- [Content Localization Specialist (Chinese - Traditional / Japanese)](https://feeny.ai/job/content-localization-specialist-chinese-traditional-japanese-speak-south-korea-9c7ckjwm39cd) — South Korea
- [Sales Development Representative - Japan](https://feeny.ai/job/sales-development-representative-japan-speak-tokyo-e3rp43s4gb2v) — Tokyo, Japan
- [Assessment Design Lead](https://feeny.ai/job/assessment-design-lead-speak-united-states-w55yxvzn27x2) — United States
- [B2B Sales Lead - Korea](https://feeny.ai/job/b2b-sales-lead-korea-speak-seoul-k7qx1kfghnya) — Seoul, South Korea
- [People Ops Specialist (Contract) - Korea](https://feeny.ai/job/people-ops-specialist-contract-korea-speak-seoul-wrbbd36m9z8c) — Seoul, South Korea
- [Content Localization Specialist (Japanese / Korean)](https://feeny.ai/job/content-localization-specialist-japanese-korean-speak-south-korea-kenmfgqkdwrf) — South Korea
- [Content Localization Specialist (Korean / Chinese - Simplified)](https://feeny.ai/job/content-localization-specialist-korean-chinese-simplified-speak-south-korea-9qvr499kdcq7) — South Korea
- [Lead Business Analyst](https://feeny.ai/job/lead-business-analyst-speak-san-francisco-dzkeyxkp1096) — San Francisco, CA
- [Senior Accountant](https://feeny.ai/job/senior-accountant-speak-san-francisco-h4wye00jhcc6) — San Francisco, CA