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      Software Developer Interview

      31 May 2022
      Anonymous employee
      Uxbridge, England
      Accepted offer
      Positive experience
      Average interview

      Application

      I applied through a recruiter. The process took 1 day. I interviewed at Giffgaff (Uxbridge, England) in May 2021

      Interview

      Live coding of a web api - java / springboot to create a palindrome checker. Full TDD using Mockito, but basically the usual spring rest api. This was basically done remotely using my IDE.

      Interview questions [1]

      Question 1

      Questions based around REST and microservices.
      1 Answer
      1

      Other Software Developer interview reviews for Giffgaff

      Software Engineer Interview

      25 Mar 2026
      Anonymous employee
      London, England
      Accepted offer
      Positive experience
      Average interview

      Application

      I applied through an employee referral. I interviewed at Giffgaff (London, England) in Mar 2026

      Interview

      Interviewed in March 2026 - process took around 2 weeks. Was broken up into 4 sections. 1. Quick call with internal recruiter (fairly standard HR screening) 2. Pair Programming Test 3. System Design Interview 4. Behavioural/Cultural interview. Overall, one of the most positive experiences I've had while interviewing, feedback is taken seriously and is given at every step of the process.

      Interview questions [3]

      Question 1

      Pairing test: questions around Java/Spring + Coding Test to be done using TDD.
      Answer question

      Question 2

      System Design interview: How would you design this system (based on given requirements)
      Answer question

      Question 3

      Cultural Interview: Past Experiences at other companies, what attracted you to GiffGaff.
      Answer question

      Software Developer Interview

      24 Aug 2023
      Anonymous interview candidate
      London, England
      No offer
      Negative experience
      Difficult interview

      Application

      I applied through other source. The process took 6 weeks. I interviewed at Giffgaff (London, England) in Aug 2023

      Interview

      1st stage: quick call with People Engangement Manager 2nd stage: technical interview The 1st stage was just an informal quick phone call to gather info about background, experience etc. The 2nd stage was a 90 mins technical interview with 1 hour of theory questions and half an hour left for a pair programming exercise, but I terminated the interview right before entering the coding exercise per se. At the end of the theory questions we were ready to move on to the technical challange part, but I could see this was not going terribly but also not swimmingly, so I interrupted the interview. The guy was a bit surprised I chose to interrupt the process but didn't seem to mind ("fair enough"). Just before saying goodbye I still wanted to raise the point that there must be a discrepancy between such nit-picking theory-heavy interviews and the actual job in practice, since somehow I always perform very well at work, in companies that do hire me after making me do something like a home project but seem to struggle to come across well in academic-style interviews. Just a nonchalant comment I felt like making about a process I've just been part of, but the interviewer decided to respond with something like "you need to know how the language works at least", which was a bit patronizing towards someone like me who, I've made sure to let it be known, is somehow relied upon for a great deal of code contributions and delivers at least at the same level as the senior developers (my managers' words, not mine). I don't know how that'd be possible without "at least knowing the language". Unless I made a mistake and was actually interviewing for a CS college professor position.

      Interview questions [1]

      Question 1

      - why did Java introduce wrapper classes and what are they - can you pass primitives to collections - difference between instantiating new Integer(1) and Integer.valueOf(1) - is the string pool limited - what is the contract between equals() and hashCode() - what happens when hashCode() is overridden - is concatenating strings with "+" good practice - what is StringBuilder - what is StringBuffer - is StringBuilder thread safe - what happens when trying to append strings with StringBuilder through multiple threads - how can concurrency problems be solved - how to make an object immutable - what is a singleton and are they scoped - ever dealt with aop
      Answer question
      4