Developer English guide
English by Developer Seniority Level: What You Need at Each Career Stage
September 29, 2026
What English a Junior, Semi-Senior, Senior and Staff developer needs. Real situations, specific vocabulary and how to practice at each career level.
Key Takeaways
- A Junior primarily needs reading and basic written English.
- From Semi-Senior onwards, spoken English in meetings becomes important.
- Seniors need English to influence: RFCs, technical discussions, career feedback.
- Staff engineers need English to align teams and write strategy documents.
- The best practice is to use English in your actual daily work from day one.
Junior: Read, Understand, and Write the Basics
At the Junior level, your English goal is to operate independently in an English-language codebase and team. You do not need fluent spoken English yet. You need:
Reading docs and Stack Overflow without Google Translate
Technical documentation is dense, but the vocabulary is finite. The faster you can read English docs directly, the faster you unblock yourself.
Understanding error messages
Error messages are written in plain English. 'Cannot read properties of undefined', 'Connection refused', 'Permission denied'. These are your daily vocabulary.
Writing commit messages
Your commit messages tell the story of what you built. Use the imperative mood and be specific.
“Fix login redirect bug on expired session”
“Add user avatar component to profile page”
“Remove unused dependency from package.json”
Basic PR descriptions
A short PR description explains what you changed and why. Two or three sentences is enough at this level.
“This PR fixes the redirect loop that occurred when a user's session expired during checkout.”
“Added the avatar component. Uses the existing image upload API.”
Asking basic questions
You need a handful of phrases to unblock yourself without waiting for someone to notice you are stuck.
“Does this approach make sense?”
“Should I use X or Y here?”
“I'm getting this error: [paste error]. Any idea what's causing it?”
Semi-Senior: Actively Participating in the Team
At Semi-Senior level, you move from consuming English to producing it actively. Meetings, code reviews, and PR descriptions become your main English workout.
Daily standups
The standup is three sentences. Learn them well and you will be comfortable in any team.
“Yesterday I worked on the payment integration. Today I'll finish the error handling and add unit tests. No blockers.”
“I'm blocked on the API response format. I'll sync with Ana to clarify the expected shape.”
Code review comments
Code review English has its own register. Be specific, suggest rather than demand, and use 'nit:' for minor style issues.
“This could be simplified to a single reduce call.”
“Consider extracting this into a helper function to make it testable.”
“Nit: rename this variable to `userId` to match the rest of the codebase.”
“This looks good to me. One minor thought: the error message could be more user-friendly.”
PR descriptions with context
A good PR description explains what changed, why you chose this approach, and what alternatives you considered. This saves review time.
“This PR adds server-side pagination to the users table.”
“The approach I chose uses cursor-based pagination because the table can have millions of rows and offset pagination becomes slow at scale.”
“I considered offset pagination first but went with cursors because of the performance concern above.”
Senior: Leading Technical Conversations
At Senior level, English stops being a tool for receiving information and becomes a tool for producing influence. You need to write documents that convince people and run meetings that end with decisions.
Leading technical discussions
You need to present a recommendation clearly, explain your reasoning, and handle pushback.
“I'd recommend we go with approach B because it gives us better observability from day one.”
“Let me share my concerns about this approach before we commit to it.”
“I hear the argument for X, but I think the trade-off is worth it because...”
Writing ADRs and RFCs
Architecture Decision Records and Request for Comments documents are the senior engineer's main written output. They need to be clear enough that someone can understand the decision six months later.
“Context: We need to choose a message broker for our event-driven pipeline.”
“Decision: We will use Kafka instead of RabbitMQ.”
“Consequences: Teams will need to learn the Kafka consumer API. Operational complexity increases, but throughput and durability justify the cost.”
Giving career feedback
Senior engineers often give feedback in 1:1s or performance reviews. The register is careful and specific.
“You did great on the payments migration. The one area I'd suggest focusing on is documentation: your code is clean but the PR descriptions don't always explain the why.”
“I want to give you some feedback on the API design review last week. The solution was solid, but you could have been more direct about your recommendation earlier in the discussion.”
Presenting technical work to stakeholders
Non-technical stakeholders need a different kind of explanation. Lead with impact, not implementation.
“We refactored the checkout pipeline. The user-facing impact is a 40% reduction in checkout errors.”
“The migration is complete. From the user's perspective, nothing changed. Behind the scenes, we moved off a legacy system that was causing 2 outages per month.”
Running retrospectives
Retros need a facilitator who can keep discussion on track and drive to action items.
“Let's focus on what we can control. What is one thing we could change in the next sprint?”
“I'm hearing two different concerns here. Let me see if I can summarise both...”
“We have 5 minutes left. Let's agree on one action item and an owner.”
Staff/Principal: Influence Without Direct Authority
Staff and Principal engineers shape direction across teams. Their English needs to be persuasive, precise, and politically aware.
Cross-team alignment
You need to build consensus before you start building. This requires careful framing.
“I want to make sure we are aligned on the direction before we start. Can we spend 30 minutes on this?”
“I know there are different views on this. My goal for today is to understand the constraints on each side.”
“We don't need to solve everything today. Let's agree on the principles and work out the details async.”
Writing proposals and strategy documents
Strategy documents need an executive summary, a clear recommendation, supporting evidence, and a section on risks.
“This document proposes a migration from monolith to services for the billing domain.”
“The recommended approach is a strangler fig pattern over 6 months.”
“Key risks: team capacity, database schema compatibility, and the need for feature freeze during cutover.”
Escalation language
Raising a risk without alarming people is a skill. Be direct but frame it as information, not accusation.
“I need to flag a risk here. The current timeline does not account for the compliance review, which takes 3 weeks.”
“I want to surface this before it becomes a blocker. We have a dependency on the platform team that is not tracked.”
Mentoring language
Staff engineers develop other engineers. Good mentoring asks questions rather than giving answers.
“What's your thinking on this? Walk me through how you got here.”
“What trade-offs did you consider?”
“If you had to do it again with what you know now, what would you do differently?”
“I think you're close. What would change if you also had to handle the case where X is null?”
How to Progress from One Level to the Next
The fastest way to level up your English is to use it in your actual work. Here is what that looks like in practice.
Write everything in English from day one
Commits, PR descriptions, internal Notion pages, Jira tickets, Slack messages to yourself. Even if nobody else reads them in English, the habit builds fluency faster than any class.
Ask your team to correct your English
Most international teams will not correct you unless you ask. Ask them to. A simple 'feel free to correct my English anytime' in a team meeting goes a long way.
Schedule dedicated practice time
30 minutes a day of focused practice on the situations you face at work beats 2 hours of general English class. Tools like Lingua-e are built specifically for these developer situations.
Study the register, not just the vocabulary
The difference between Junior and Senior English is not mostly vocabulary. It is register: knowing when to be direct, when to hedge, and how to frame a recommendation so people accept it.
Frequently Asked Questions
What English does a Junior developer need?
A Junior developer primarily needs reading and basic written English: understanding technical documentation and error messages, writing clear commit messages, and asking basic questions to the team. Fluent conversational English is not required early on, but enough to communicate in writing and understand what they read.
When does a developer need fluent conversational English?
Fluent conversational English becomes important from Semi-Senior level onwards, when you start participating in team meetings, verbal code reviews, and communicating with international stakeholders. Seniors and Staff need solid English to lead technical discussions, present proposals, and give career feedback.
What is the difference between a Junior and a Senior developer's English?
A Junior primarily reads and writes basic technical English: docs, commits, Stack Overflow questions. A Senior uses English to influence: writes RFCs that convince, leads technical meetings, gives career feedback, and presents to executives. The difference is not just vocabulary but register and communicative precision.
How can I improve my technical English while working?
The most effective strategy is to use English in your daily work from day one: write all your commits and PRs in English, reply in English when someone writes in English, always read documentation in English first. If you work in a Spanish-speaking team, complement this with Lingua-e to practice the specific situations of each seniority level.
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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.