Technical Engineering Interview Guide

The purpose of this guide is to help us interview engineering candidates. The questions here are behavioral in nature, designed to get candidates talking about specific situations and how they handled them. Guidelines are suggested for evaluating the strength of the answers.

Whenever possible, ask these questions exactly as they’re worded to try to get consistency between multiple candidates. When interviewing, please take notes, and note what the candidate says, rather than your impressions — that will help you share behavior reasons for your conclusions and decisions.

Remember to be as pleasant and friendly as you can be! You can deliver a demanding interview while being kind and empathetic.

For more information on interviewing in general, check out the interviewing guide.

Introductory Statement

You should say this, or something close to it, before beginning:

Hello my name is ___, my pronouns are _, and my role at 18F is ____.

Thanks for interviewing with me today. This’ll be a behavioral interview, which means I’ll ask a series of questions about experiences you’ve had and how you handled them, or about how you'd handle hypothetical situations. There are no “right” answers; I’m interested in talking through these situations with you. I’ve got about 4-5 questions, and this will take us about an hour, perhaps a bit less. Don’t be surprised if others ask the same questions in other interviews; that’s normal.

There’ll be times when I ask for more information, or want to dig deeper into your answers. That’s normal, too: I want to make sure I understand what you did and why. I’ll be taking notes, please don’t let that distract you.

I’ll ask you my questions first, and then I’ll leave some time to answer any questions you’ve got for me. I’m excited you’re here - let’s get started!


Since this is a public document, only the questions themselves are published here. 18F staff: click through to see follow-ups and good/bad signs in the full engineering interview question bank.

For DevOps/SRE candidates: don't miss the DevOps/SRE question supplement.

Problem Solving

These questions probe for the ability to design, analyze, synthesize and/or evaluate information to produce and defend a desired solution.

Preface saying there’s no right answer, that we’re just looking to talk through the problem with the candidate.

Help guide the candidate to the right line of thinking, don’t allow them to get too bogged down in the wrong line of thinking, help them get back on track.

Agile Orientation

Maintainable Software Development

This probes for the ability to develop software in a repeatable and documentable way, with emphasis on automation, testing, measuring, and scaling infrastructure.