Technical English guide
Why Duolingo Is Not Improving Your Technical English
You have a streak. You complete every lesson. But you still freeze in standups and code reviews. Here is why Duolingo is not the right tool for a developer's English goals.
You have been using Duolingo for months. Maybe over a year. Your streak is intact. You earn your XP every day.
But in your next standup in English, you still freeze. In your next code review, you still write comments that feel clumsy. In your next interview, you still struggle to explain your architecture clearly.
This is not your fault. Duolingo was not built for you. It was built for tourists and students, not for developers working on international teams.
This article explains why Duolingo does not work for technical English, and what to do instead.
What Duolingo is actually good at
En qué sí es bueno Duolingo
Let us be fair. Duolingo is a good product. It is free, accessible, and it does some things very well.
If you are at A0 and want to reach A1, Duolingo works. It builds the habit of daily practice, which matters. It introduces basic vocabulary and simple sentence patterns. It is gamified in a way that keeps beginners engaged.
But after A2, the returns drop fast, especially for developers. The problem is not the app. The problem is that Duolingo was built for a completely different goal than what you need.
Builds a daily learning habit
The streak and XP system keeps beginners consistent.
Good for A0 to A1
If you know almost no English, Duolingo is a solid starting point.
Free and accessible
No cost barrier. Available on any device.
Introduces basic patterns
Simple sentences, common words, basic grammar.
The vocabulary problem
El problema del vocabulario
Duolingo teaches general English. "The cat is on the table." "I would like a coffee." "Where is the train station?"
Developer English is completely different. Here is a comparison:
| Duolingo teaches | What you actually need |
|---|---|
| "I would like a coffee" | "I am blocked waiting for a review" |
| "The cat is on the table" | "The build is failing on main" |
| "Where is the train station?" | "Can you take a look at my PR?" |
| "I am going to the market" | "I am pushing this to a feature branch" |
| "She likes to travel" | "This introduces a regression" |
You can finish 600 Duolingo lessons and still not know how to say "I am blocked waiting for a review" in a standup. Terms like pull request, sprint, regression, dependency, merge conflict, and code review simply do not appear in Duolingo.
The vocabulary gap is not small. It is the difference between being able to order a coffee and being able to participate in a technical discussion.
Learn the vocabulary you actually need:
The speaking problem
El problema del speaking
Duolingo is mostly reading and listening. You read a sentence and choose the right answer. You listen to an audio and type what you heard. Occasionally you repeat a phrase.
Real developer work requires producing English under pressure. Standups. Meetings. 1-on-1s with your manager. Technical interviews. You need to speak and write in real time, not recognize the correct answer in a multiple choice test.
Duolingo trains recognition. Your job requires production. These are different skills, and Duolingo trains the wrong one for your context.
Daily standup
You need to say: "Yesterday I worked on the auth service. Today I am fixing the bug from the ticket. I am blocked waiting for design feedback."
This requires producing English, not recognizing it.
Code review comment
You need to write: "This approach works but it might cause a performance issue with large datasets. Consider using pagination here."
This requires real writing skill, not multiple choice.
Technical interview
You need to explain: "I chose a microservices architecture because each service can scale independently. The main tradeoff is operational complexity."
This is production English under pressure. Duolingo does not prepare you for this.
Practice speaking for the situations you actually face:
The context problem
El problema del contexto
Duolingo teaches English in tourist contexts: ordering food, asking for directions, shopping, talking about family. These situations almost never come up in a developer's workday.
A developer's context is different:
- Writing a pull request description that explains what changed and why
- Explaining a bug in a Jira ticket with steps to reproduce
- Asking for help in Slack without sounding vague
- Participating in a sprint retrospective and suggesting improvements
- Joining a technical discussion about architecture choices
- Writing a professional email to a client about a delay
These situations require completely different vocabulary and register. "Register" means the level of formality and the type of language appropriate for the context. Writing a Slack message to a teammate is different from writing an email to a client. Explaining a bug to a product manager is different from explaining it to a senior engineer.
Duolingo teaches none of this.
Practice real developer contexts:
The level problem
El problema del nivel
Duolingo is optimized for beginners. Its algorithm is designed to keep beginners engaged, because that is its largest audience.
Most developers who have used Duolingo for a year are already at A2 or B1. But Duolingo keeps them in the beginner loop. The exercises stay easy. The vocabulary stays simple. The retention algorithm rewards streaks, not progress.
To work comfortably at an international tech company, you need B2. At B2, you can understand most meetings, express your ideas clearly, and write professional emails without constant help. Duolingo will not get you from B1 to B2, because B2 requires practicing the specific situations of your work, not the general English of its curriculum.
Duolingo can help here
Not ready for international work
Duolingo keeps you here
Understand basic meetings, but struggle with complex discussions
Duolingo will not get you here
Work comfortably at an international tech company
Find out your real level and what to do next:
What actually works instead
Qué funciona en cambio
The key is to spend most of your practice time on the English you actually need, not the English Duolingo decides to teach you.
Use English at work, not just in an app
Write your commit messages in English. Comment your code in English. Change your IDE and tools to English. Every small action builds real habit.
Practice the exact situations you face
Standups, code reviews, technical emails, sprint ceremonies. Practice those specific scenarios, not generic conversations about food and travel.
Learn developer vocabulary, not general vocabulary
Focus on the terms you hear every week: pull request, merge conflict, regression, dependency, standup, retrospective. That vocabulary gives you real ROI.
Know where you actually are
Take a CEFR level test built for developers. Knowing your real level helps you focus on the right exercises instead of guessing.
Use Lingua-e for developer-specific practice
Lingua-e is built specifically for developers. Exercises on standups, code reviews, bug reports, emails, and the vocabulary you actually use at work.
Start practicing with exercises built for developers:
Is Duolingo useless?
¿Es Duolingo inútil?
Short answer: no.
Duolingo is a good warm-up habit. Ten minutes of Duolingo plus thirty minutes of real developer practice is better than forty minutes of Duolingo.
The problem is when Duolingo becomes your main English learning tool. When you spend 40 minutes a day on Duolingo and call it English practice, you are spending most of your time on the wrong things.
Use Duolingo for what it is good at: maintaining a daily habit and reviewing basics. But make sure the majority of your practice time is on the English that matters for your specific job.
The 80/20 rule for developer English
Spend 80% of your practice time on developer-specific English: standups, code reviews, technical emails, vocabulary you use at work. Use Duolingo or similar apps for the remaining 20% as a warm-up habit.
Keep practicing with developer-specific exercises
Sigue practicando con ejercicios para developers
Ready to practice your English at work?
Lingua-e has interactive exercises built around real developer conversations: standups, code reviews, retrospectives, and more. Practice until it comes naturally.
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Written by
Roxana LafuenteLingua-e's founder
Roxana Lafuente is a software engineer with 8+ years of experience. At the beginning of her career, even though she had already passed the First Certificate in English, she still froze every time she had to speak up in the daily standup. That was a gap nobody was fixing. After 2,000+ standups, she figured out what actually builds fluency: practice that looks like your real work. She built Lingua-e so other developers wouldn't have to take the long road to feel confident working in an international development environment.