Lead Web Developer Interview Questions

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Implement a calculator that evaluates arithmetic expressions written in a custom prefix notation (e.g., "+ 3 4" instead of "3 + 4"), ensuring it handles nested operations without parentheses. Some unit tests were provided to verify correctness.
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Senior Web Engineer

Interviewed at Canonical

3.2
Aug 12, 2025

Implement a calculator that evaluates arithmetic expressions written in a custom prefix notation (e.g., "+ 3 4" instead of "3 + 4"), ensuring it handles nested operations without parentheses. Some unit tests were provided to verify correctness.

1. How would you optimise a cache service after a underling table has been updated? 2. How would you store large precision currency values in PHP/MySQL when float doesn't provide enough precision (the answer is *not* decimal)? 3. What is the difference between and facade and decorator pattern and when would you use each one? 4. Describe the definition of SOLID?
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Contract PHP Web Developer

Interviewed at WorldFirst

3.5
Nov 15, 2016

1. How would you optimise a cache service after a underling table has been updated? 2. How would you store large precision currency values in PHP/MySQL when float doesn't provide enough precision (the answer is *not* decimal)? 3. What is the difference between and facade and decorator pattern and when would you use each one? 4. Describe the definition of SOLID?

I was able to answer all the questions they raised. I don't recall any that was unexpected. Sample questions include whether I could handle business and economic news even if I had no economic or business background (I studied and wrote on economic issues and covered business stories during my media stint with other publications) and whether I could handle stress on the job (all jobs have stress, the question is how much will you be paid for it? And if you really enjoy what you're doing and are good at it, stress is negligible and is easily taken in stride).
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Web Production Editor

Interviewed at Financial Times

4
Sep 13, 2012

I was able to answer all the questions they raised. I don't recall any that was unexpected. Sample questions include whether I could handle business and economic news even if I had no economic or business background (I studied and wrote on economic issues and covered business stories during my media stint with other publications) and whether I could handle stress on the job (all jobs have stress, the question is how much will you be paid for it? And if you really enjoy what you're doing and are good at it, stress is negligible and is easily taken in stride).

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