How to Interview Engineers When You're Not Technical

The 5 signals, 8 questions, and 1-page scorecard for founders who can't judge the code · by HireSphere AI

You don't need to understand the code to spot a strong engineer, or a risky one. Unlock the guide (5 signals, 8 questions with strong-vs-weak answers, red flags) and use the scorecard below on your next candidate.

Inside: the 5 signals any founder can evaluate · 8 plain-English questions with what strong and weak answers sound like · 5 red flags that need zero technical knowledge · a 1 to 5 scorecard with a hire / second-opinion / pass band.

Score a candidate (optional): 1 = weak, 5 = strong

Communication: Can explain technical things in business terms

Ownership: Takes responsibility for outcomes and failures

Judgment: Reasons in trade-offs, not absolutes

Curiosity: Keeps learning and applies it

Delivery: Estimates accurately and ships reliably

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/ 25 candidate score

Why the signals matter

As a non-technical founder you can't judge their code. But you can judge how they think, communicate, problem solve, own outcomes, learn, and make decisions. The great part about this is these behavioral traits show up in 4 measurable results you can ask about on any technical hire.

  • Delivery → Code meeting objectives (both explicit & implicit)
  • Judgment → Speed of running code (decisions you made building it)
  • Curiosity → Space / data storage of code
  • Ownership → Time it takes to write code (1 hr/week vs. 8 hrs/week)

The communication piece is for senior leaders, but for a non-technical founder this gives you a true asset that can bridge the gaps you have.

8 plain-English questions: what a strong vs. a weak answer sounds like

1. Walk me through a technical decision you made that you'd make differently now.
Names the trade-off, what they optimised for, the business impact, and what changed their mind.
Blames the team or tooling, or can't think of one: 'it worked out fine.'
2. Explain the hardest technical problem you've solved as if I were a customer.
Plain language, an analogy, and why it mattered to the user or the business.
A wall of jargon; visibly frustrated that you don't follow.
3. Tell me about something you shipped late. What happened and what did you change?
Owns it, names the systemic cause (scope, estimates, dependencies), and describes a specific fix they still use.
Excuses, or claims nothing has ever been late.
4. How would you decide whether to build a component or buy it?
Frames cost, time, risk, maintenance, and how core it is to the product.
'Always build' or 'always buy', with no framework.
5. How do you estimate how long something will take?
Breaks work down, gives ranges, flags unknowns early, communicates when the estimate moves.
Gut numbers with false precision; never revisits an estimate.
6. Tell me about a bug or outage you caused. How did you handle it?
Transparent, fast to communicate, ran a post-mortem, prevented the class of error.
'I've never caused one' or blames whoever merged it.
7. What have you learned in the last six months, and how did you apply it?
Specific topic, specific application, honest about what didn't work.
Vague ('I keep up with things'), nothing applied.
8. If I gave you our codebase tomorrow, what would you do in your first week?
Read, ask questions, find a small safe win, learn how work flows before changing it.
'Rewrite it' before understanding it.

Red flags that need no technical knowledge

  • Can't explain their work simply.
  • The rewrite-everything reflex.
  • No ownership of a single failure.
  • Dismissive of business constraints (deadlines, budget, customers).
  • Vague on specifics when you ask "what did you do?"

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