How a Spanish Full-Stack Engineer Built Interview-Ready English

The Interview Problem

You know how to do the job. The difficult part is explaining it in English when an interviewer is watching. He was a full-stack engineer in Spain. In the room, system design was what broke down.

What We Practised

Practice matched the round he actually had to speak: system design. Each mock interview included notes on the same answer - where he paused, which words were vague, and where the structure broke.

• Practised stating the requirements in English before naming any services or components.
• Used the same spoken order every time: scope, then main components, then bottlenecks, then trade-offs.
• Practised explaining design trade-offs out loud, not only drawing boxes on a board.
• Worked on saying metrics in full English sentences - for example latency, load, and cost.
• Described the architecture in English without stopping to translate each sentence in his head.

Useful references along the way: What to expect in English interviews.

Why System Design Is Difficult in English

System design is a thirty-to-forty-five-minute spoken explanation. You must order the components, defend trade-offs, handle follow-up questions, and keep the 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 clear in a second language.

Preparing for a similar path? Read System Design in English: A Full-Stack Engineer Case Study.

After the Coaching

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

What Other Engineers Can Learn

• State the scope in English before you name any services.
• Use one spoken order every time: requirements, then scale, then architecture, then bottlenecks, then trade-offs.
• Practise saying metrics such as latency, queries per second, and storage in full sentences.
• Name at least one trade-off out loud, even when you are sure about the design.
• Record a fifteen-minute design walkthrough and listen only for jumps and unfinished sentences.