How an American Security Engineer Built English Fluency for Google

The Gap Between Knowing and Explaining

Strong engineers still stall when they have to think and speak English at the same time. He was a security engineer in the United States. The next interviews were at Google, in English. When he had to explain a system design out loud, his answers lost structure and he paused to translate.

What We Practised

Practice matched the round he actually had to speak: system design for Google. After each mock, he got notes on the same answer - where he paused, which words were vague, and where the structure broke.

• He practised clarifying requirements before naming services or components.
• He used a fixed spoken order: scope, components, bottlenecks, then trade-offs.
• He practised explaining trade-offs out loud, not only drawing boxes on a board.
• He worked on saying metrics and numbers in English (latency, load, cost).
• He narrated architecture without stopping to translate each sentence.

Useful references along the way: What to expect in English interviews, Pronouncing numbers and metrics.

Why System Design Is Difficult in English

System design is a 30–45 minute spoken explanation. You must sequence components, defend trade-offs, handle follow-ups, and keep vocabulary accurate while the clock runs. Translating each sentence in your head uses the time the interviewer needed for depth. A fixed spoken order is what keeps the round coherent in a second language.

Preparing for a similar path? Read How a Croatian Security Engineer Prepped for Google's Behavioral Interviews.

What Changed

He gained clearer, more confident English for interviews. He could explain the work more clearly when questions got hard. That readiness was the goal - not a promised job offer.

What to Practise

• Clarify the scope before you name services.
• Use one spoken sequence every time: requirements, scale, architecture, bottlenecks, then trade-offs.
• Practise saying metrics (latency, queries per second, storage) in full sentences.
• Name one trade-off out loud even if you already feel sure about the design.
• Record a fifteen-minute design walkthrough and listen only for jumps and unfinished sentences.

Starting Point

He prepared for English-language interviews as a security engineer. Written English was stronger than speaking against the clock.