Walking through a project you built
Say what it does in one sentence, make your part clear, and let them choose where to zoom in.
What they’re listening for
- • Can you explain it simply?
- • What did you personally do?
- • One interesting problem and how you solved it
The most common mistake is starting with the tech stack. Start with what the project does and who it's for. Then say what your part was, pick one interesting problem, and stop. The interviewer will ask about the parts they care about.
Stiff vs. natural
Interviewer: “Tell me about a project you're proud of.”
Sounds stiff
“We developed a scalable platform using React, Node.js, PostgreSQL, Redis, Docker and Kubernetes. We implemented many features and improved performance. The project was very successful and the stakeholders were satisfied.”
Sounds natural
“Sure. The one I'd pick is an internal tool for our support team. It pulls a customer's orders, payments and tickets into one screen, so they stop jumping between five tabs. I built the backend and most of the search. The interesting part was search: people paste in anything, a name, half an email, an order number, so I spent a while making it forgiving without making it slow. Average handling time dropped by a couple of minutes per ticket. Happy to go deeper on any part.”
- One sentence on what it does and who it's for, before any technology.
- “I built…” makes your part clear. A list of “we” hides you.
- One interesting problem is better than every feature.
- “Happy to go deeper” hands control back to the interviewer.
When they zoom in
Interviewer
“You mentioned search. How did you make it fast?”
You
“So at first it was just a LIKE query in Postgres, which was fine with a few thousand customers and very not fine with a few hundred thousand. I added a trigram index, which made the fuzzy matching fast again, and cached the most recent lookups. Do you want me to get into how the index works, or stay on the product side?”
Starts with the simple version, then what changed and why.
Interviewer
“That's enough detail. What would you do differently?”
You
“Honestly, I'd talk to the support team earlier. I built a really nice filters panel that nobody used. They just wanted one search box.”
A short, honest look back. Interviewers ask this a lot.
Walking through a project
- “The short version is…”What it does, in one sentence.
- “My part was…”Making your role clear.
- “The interesting part was…”Picking the one problem worth talking about.
- “What we ended up with was…”The result.
- “Happy to go deeper on any part.”Letting them choose where to zoom in.
- “If I did it again, I'd…”What you learned.
Now say it out loud
Rehearse with the AI interviewer and get feedback on your answers.