Code reviews are one of the most powerful tools a tech lead has — not just for catching bugs, but for teaching, building trust, and raising team quality. Yet for many Vietnamese developers stepping into tech lead roles, writing review comments in English can feel awkward. Too harsh and you damage morale. Too soft and the feedback gets ignored.
This post gives you the exact language patterns to make your code reviews clear, respectful, and effective in international teams.
Why Code Review Language Matters
Think about the last time you received a review comment like:
“This is wrong.”
How did it feel? Now compare it to:
“This approach might cause a race condition when multiple threads call this method simultaneously — could we add a mutex here?”
Same concern. Completely different impact. In international teams, how you say something is often as important as what you say. English-speaking engineers expect a collaborative tone — even when pointing out serious mistakes.
As a Vietnamese tech lead, you’re navigating both a language gap and a cultural one. In Vietnamese culture, direct criticism can signal seniority. In Western engineering culture, that same directness can read as aggressive or dismissive.
Three Levels of Feedback
A practical framework: think of review comments in three levels of urgency.
Blockers (Must Change) These are bugs, security issues, or violations of team standards. Be clear but not brutal.
“This SQL query is vulnerable to injection attacks. We need to use parameterized queries here — I’ll drop a link to our security guidelines.”
Suggestions (Should Consider) Better approaches that aren’t strictly required, but would improve the code.
“This works, but have you considered using a dictionary lookup instead of the switch statement? It would make adding new cases much easier down the line.”
Nits (Nice to Have) Style preferences or minor improvements. Label these clearly so the author knows they’re optional.
“Nit: the variable name
datais a bit generic here — something likeuserProfileDatamight be clearer. Not a blocker though.”
🗣️ Key Phrases to Say Out Loud
Practice these aloud — they’re the building blocks of great review comments.
| Phrase | IPA Pronunciation |
|---|---|
| ”Could we consider an alternative here?” | /kʊd wiː kənˈsɪdər ən ɔːlˈtɜːrnətɪv hɪr/ |
| “This might cause issues when…” | /ðɪs maɪt kɔːz ˈɪʃuːz wɛn/ |
| “I think there’s a potential edge case…” | /aɪ θɪŋk ðɛrz ə pəˈtɛnʃəl ɛdʒ keɪs/ |
| “Nice approach — one thought though…” | /naɪs əˈproʊtʃ wʌn θɔːt ðoʊ/ |
| “What was the reasoning behind this?” | /wʌt wɒz ðə ˈriːzənɪŋ bɪˈhaɪnd ðɪs/ |
| “Let’s align on this in our next sync.” | /lɛts əˈlaɪn ɒn ðɪs ɪn aʊər nɛkst sɪŋk/ |
| “Blocking this — happy to discuss async.” | /ˈblɒkɪŋ ðɪs ˈhæpi tə dɪˈskʌs ˈeɪsɪŋk/ |
📚 Vocabulary
1. Nit /nɪt/ A minor, non-blocking comment. From “nitpick.” Example: “Nit: missing semicolon on line 47.”
2. Blocker /ˈblɒkər/ A serious issue that prevents the PR from being merged. Example: “This is a blocker — it breaks the existing authentication flow.”
3. Edge case /ɛdʒ keɪs/ An unusual or extreme input scenario that might cause unexpected behavior. Example: “What happens in the edge case where the list is empty?”
4. Align /əˈlaɪn/ To reach agreement or get on the same page. Example: “Let’s align on the API contract before you build the client.”
5. Out of scope /aʊt əv skoʊp/ Not part of the current task or PR. Example: “Refactoring the entire module is out of scope for this PR — let’s create a separate ticket.”
6. Trade-off /ˈtreɪdɒf/ A compromise between two desirable but conflicting options. Example: “There’s a trade-off here between performance and readability.”
7. Follow-up /ˈfɒloʊʌp/ A subsequent action or task. Example: “I’ll leave this as a follow-up ticket for the next sprint.”
🎯 Practice Now
Dialogue: Live Code Review Discussion
You’re reviewing a PR from your colleague Minh in a Slack huddle. Practice reading both roles aloud.
You (Tech Lead): “Hey Minh, thanks for the PR. Overall looks solid — I left a few comments. The main one I want to discuss is around line 82.”
Minh: “Sure, what’s the concern?”
You: “So right now the function fetches user data on every render. That’s going to cause performance issues on pages with a lot of components. Could we move this into a context or a custom hook so it only fetches once?”
Minh: “Ah, I see the issue. Would using useCallback solve it?”
You: “Partially — but the real fix is memoizing the fetch itself. I think useCallback combined with a dependency array check should do it. Happy to pair on this if it helps.”
Minh: “That would be great, thanks.”
Written Comment Rewrites
Rewrite these harsh comments into professional English. Then check your version against the suggested answers.
Original: “Why did you do it this way? This is inefficient.” Better: “I’m curious about the approach here — for large datasets this could be O(n²). Would it make sense to use a hashmap to bring that down to O(n)?”
Original: “This is wrong. Fix it.”
Better: “There’s a logic error here — when userId is null, this will throw a NullPointerException. Could we add a null check before the lookup?”
Original: “This code is hard to read.” Better: “The nested conditionals here are a bit complex to follow. Would you be open to extracting this into a helper method with a descriptive name? It would make the intent much clearer.”
Closing Thought
The best code reviewers aren’t the ones who catch the most bugs — they’re the ones who help their team grow. In English, that means using curiosity instead of accusation, suggestions instead of commands, and praise alongside criticism.
Practice these phrases until they feel natural. Your team will notice the difference — and so will your code quality.
Keep reviewing, keep growing.