Running a technical interview in English is a different skill from taking one. As the interviewer, you need to keep the conversation flowing, probe deeper when answers are shallow, stay neutral in tone, and write structured feedback afterward — all while evaluating someone’s technical ability in real time. For Vietnamese tech leads working in international companies, this is one of the highest-stakes English situations you’ll face.
This post gives you the exact language you need.
Why This Is Hard
In Vietnamese culture, we tend to avoid direct confrontation — if a candidate gives a weak answer, the natural instinct is to move on rather than push back. In English-language interviews, probing follow-up questions are expected and normal. A tech lead who doesn’t push back might miss critical signals about a candidate’s real depth.
The other challenge: staying neutral. How you phrase feedback (“He seemed nervous” vs “He struggled to explain time complexity”) matters for legal, fairness, and consistency reasons.
🗣️ Key Phrases to Say Out Loud
Practice these before your next interview. Say each one 3 times — confidence comes from repetition.
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“Walk me through your thought process.” /wɔːk miː θruː jɔːr θɔːt ˈprəʊsɛs/ Stress: walk through, thought process
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“Can you elaborate on how you’d handle edge cases?” /kæn juː ɪˈlæbəreɪt ɒn haʊ juːd ˈhændəl ɛdʒ keɪsɪz/ Stress: elaborate, edge cases
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“That’s a valid approach — what are the trade-offs?” /ðæts ə ˈvælɪd əˈprəʊtʃ — wɒt ɑːr ðə ˈtreɪdɒfs/ Stress: valid, trade-offs
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“Let’s say the requirements change — how would you adapt your design?” /lɛts seɪ ðə rɪˈkwaɪərməns tʃeɪndʒ — haʊ wʊd juː əˈdæpt jɔːr dɪˈzaɪn/ Stress: requirements change, adapt
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“I’d like to move on to the next section — we’ve got about 10 minutes left.” /aɪd laɪk tə muːv ɒn tə ðə nɛkst ˈsɛkʃən — wɪv ɡɒt əˈbaʊt tɛn ˈmɪnɪts lɛft/ Stress: move on, 10 minutes left
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“Is there anything you’d like to add before we wrap up?” /ɪz ðɛr ˈɛnɪθɪŋ juːd laɪk tə æd bɪˈfɔːr wiː ræp ʌp/ Stress: add, wrap up
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“I’ll share feedback with our recruiting team within 24 hours.” /aɪl ʃɛr ˈfiːdbæk wɪð aʊər rɪˈkruːtɪŋ tiːm wɪˈðɪn ˈtwɛntɪfɔːr ˈaʊərz/ Stress: feedback, 24 hours
📚 Vocabulary
| Word | Pronunciation | Meaning | Example |
|---|---|---|---|
| probe | /prəʊb/ | đào sâu, hỏi thêm để kiểm tra | ”I probed his answer on caching — he didn’t know the difference between LRU and LFU.” |
| elaborate | /ɪˈlæbəreɪt/ | giải thích chi tiết hơn | ”Can you elaborate on why you chose PostgreSQL over MongoDB here?“ |
| trade-off | /ˈtreɪdɒf/ | sự đánh đổi, ưu/nhược điểm | ”Every architecture has trade-offs — I want to hear the candidate’s reasoning.” |
| structured feedback | /ˈstrʌktʃəd ˈfiːdbæk/ | phản hồi có cấu trúc, rõ ràng | ”I write structured feedback within 2 hours so I don’t forget the details.” |
| hiring bar | /ˈhaɪərɪŋ bɑːr/ | tiêu chuẩn tuyển dụng | ”This candidate didn’t meet our hiring bar for system design.” |
| calibrate | /ˈkælɪbreɪt/ | căn chỉnh, đồng bộ đánh giá với team | ”We calibrate interview scores across the panel before making a decision.” |
| signal | /ˈsɪɡnəl/ | dấu hiệu, tín hiệu (trong context tuyển dụng) | “That was a strong signal on problem-solving, but a weak signal on communication.” |
🎯 Practice Now
Dialogue 1: Probing a Shallow Answer
Candidate says: “I’d use Redis for caching.”
Your turn — practice saying these follow-ups out loud:
Level 1 probe:
“That makes sense. Can you walk me through what you’d cache specifically, and what your eviction strategy would be?”
Level 2 probe (if they still give a vague answer):
“Interesting — what’s the trade-off between caching at the application layer versus the database layer in this scenario?”
Level 3 probe (if still shallow):
“Let me give you a concrete constraint: you have 500MB of Redis memory and 10 million daily active users. How do you decide what stays in cache?”
Tip: You don’t need to ask all three — one good probe that gets a detailed answer is better than three probes that make the candidate feel interrogated.
Dialogue 2: Managing Time Mid-Interview
You’re 30 minutes in and behind schedule. Say this:
“I want to make sure we cover system design before we finish — let’s move on from the coding section. We have about 20 minutes left, and I want to give you full time on the design question.”
Practice this transition out loud. The key is to sound warm, not rushed. Your tone signals: “I’m managing this for both of us,” not “you took too long.”
Dialogue 3: Closing the Interview
Read this closing statement out loud:
“That’s all the questions I have. Thanks for your time today — I enjoyed hearing how you approached the distributed caching problem. We’ll be in touch with feedback within 48 hours. Is there anything you’d like to ask me about the role or the team?”
Pronunciation focus:
- distributed — /dɪˈstrɪbjʊtɪd/ — stress on second syllable: dis-TRIB-u-ted
- appreciate → enjoyed is warmer and more natural in informal closing
- feedback within 48 hours — set a specific timeframe, not “soon” or “shortly”
🎯 Writing Structured Feedback (After the Interview)
Feedback should be behavioral, not personal. Practice the language difference:
| ❌ Avoid (Personal) | ✅ Use Instead (Behavioral) |
|---|---|
| “He seemed nervous" | "He paused frequently when asked to explain trade-offs" |
| "She wasn’t confident" | "She changed her approach 3 times without explaining why" |
| "He’s not a team player" | "He didn’t ask any clarifying questions before diving into the solution" |
| "She talked too much" | "She spent 15 of 20 minutes on implementation details and didn’t address scalability” |
Template for your feedback notes:
Technical signal: [strong/mixed/weak] — [specific observation]
Communication: [strong/mixed/weak] — [specific observation]
Problem-solving: [strong/mixed/weak] — [specific observation]
Hiring recommendation: [yes/no/strong yes/strong no]
Key evidence: [one concrete example that drove your decision]⏱️ 5-Minute Drill
Right now, say these sentences out loud:
Minute 1: Opening (say 3 times)
“Thanks for joining us today. I’m [name], tech lead on the platform team. We’ll spend about 45 minutes together — coding first, then system design, and we’ll leave 10 minutes for your questions.”
Minute 2: Probing (say each once, clearly)
- “Walk me through your thought process.”
- “What are the trade-offs here?”
- “Can you elaborate on that?”
- “How would you handle this at scale?”
Minute 3: Neutral pushback (say with a calm, curious tone — not aggressive)
“That’s one approach. Some engineers go a different direction — what would make you choose this over [alternative]?”
Minute 4: Time management
“I want to make sure we cover system design — let’s move on. We have 15 minutes left.”
Minute 5: Close + wrap-up
“That wraps up my questions. Thanks for your time. We’ll share feedback within 48 hours — do you have any questions for me?”
Record yourself on your phone. Listen back once. The things that feel awkward out loud are your next drill targets.
This Week’s Tech Lead English Challenge
Next time you’re in an interview — as interviewer or observer — write down 3 phrases the interviewer used that felt smooth or natural. Those are your models. Steal them.
Language that works in context always beats language you invented in a vacuum.