Duolingo

The World's #1 Language-Learning App — 800M+ Users, Free Education for Everyone

The consensus on Duolingo: Choose Duolingo if you want to A/B test your way to making free education available to 800M+ people — but the pace rewards shipping over perfection, and comp trails FAANG by ~20%.

4.2

Glassdoor Rating

~900

Employees

$130k–$280k

Total Compensation

Pittsburgh, PA

Headquarters

Culture Overview

What it's really like to work at Duolingo

In 2011, Luis von Ahn — the Carnegie Mellon professor who invented CAPTCHA and reCAPTCHA — asked a simple question: why does the best education in the world cost thousands of dollars? He and Severin Hacker built Duolingo to answer it. Fifteen years later, 800M+ people use the app, and the culture still reflects that founding tension between mission and metrics.

Duolingo is obsessively product-driven. Everything gets A/B tested — lesson flows, streak mechanics, notification timing, even the owl's facial expressions. Engineering is the largest department at 347 people (40% of headcount), and engineers are expected to think like product owners, not ticket-takers. The communal lunch tradition, running daily since the company's earliest days, isn't just a perk — it's where cross-functional ideas collide. The pace is fast, shipping is rewarded, and the mission is real. But the hybrid-office policy is strict (3 days in Pittsburgh or NYC), and comp sits around 80% of FAANG equivalents.

Glassdoor Ratings

Duolingo Glassdoor Ratings & Employee Reviews

4.2

Overall Glassdoor Score

Based on 151 reviews

Culture & Values 4.2

Work-Life Balance 3.8

Compensation & Benefits 4.0

Career Opportunities 3.7

Work-Life Balance (Software Engineers) 4.1

Overall Rating 4.2

76% Recommend to a Friend

CEO Approval

Employee Review Themes

Working at Duolingo: Pros & Cons

✓ What employees love

✓ World's #1 education app — 800M+ users, genuine social impact you can feel daily
✓ Strong product culture with data-driven experimentation — A/B testing everything from lessons to notifications
✓ Collaborative teams with daily communal lunches — a company-wide tradition since day one
✓ Public company (DUOL) with competitive comp, RSUs, and a 2-week winter break

✗ What could be better

✗ Shipping fast is rewarded — can create pressure to work longer hours during launches
✗ Comp is ~80% of FAANG for equivalent roles — offset somewhat by lower Pittsburgh COL
✗ Promotion cycle reduced to 1x per year — can feel slow for high performers
✗ In-office 3 days required — strict hybrid policy, not fully remote

Engineering Culture

How the engineering team works

Tech Stack

Python Kotlin Swift React DynamoDB AWS

Scale & Product

800M+ registered users across iOS, Android, and web. Adaptive learning powered by massive-scale ML models that personalize every lesson. The app runs millions of A/B tests annually — experimentation is the product culture.

AI & Machine Learning

Duolingo's Birdbrain ML system personalizes difficulty in real time for each learner. The team also builds AI-powered features like Duolingo Max (GPT-4 integration for roleplay and explanations) and speech recognition models for pronunciation.

Team Structure

347 engineers across Pittsburgh, NYC, Seattle, and Berlin — the largest department at 40% of headcount. Engineers are organized into product-aligned squads with significant autonomy. Technical founders (Luis von Ahn: CS professor, CAPTCHA inventor) set the tone.

Who Thrives Here

Duolingo is the right fit if you are...

Product-Minded Engineers

You don't just write code — you think about user behavior, propose experiments, and care deeply about metrics. At Duolingo, engineering and product thinking are inseparable.

Mission-Driven at Scale

You want your work to matter beyond revenue. Duolingo's free tier genuinely educates hundreds of millions of people. If "make the best education universally available" resonates, this is your place.

Experimenters & Data Lovers

You're comfortable letting data settle debates. Duolingo A/B tests obsessively — even the owl's expressions. If you'd rather run an experiment than argue in a meeting, you'll thrive.

Collaborative Culture Seekers

You value the daily communal lunch, cross-team collaboration, and a workplace where people genuinely like spending time together. Duolingo's Pittsburgh roots keep the culture grounded and friendly.

Open Positions

Join the Duolingo team

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