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Tester Interviews: Techniques and Tasks

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This post is inspired by a recent discussion on the The Club at Ministry of Testing.


Edit: It has also been translated into Russian on Software-Testing.RU.  Please note that this translation was not requested, proofed, or approved by me.  I bear no responsibility for the content or accuracy of the translated post.


I’m a software tester with a past life in the IT recruitment industry.  I’m also a serial interviewee.  Immediately before starting my current position at MaibornWolff, I attended interviews with five companies before choosing the right opportunity for me.  In the previous five years, I’ve interviewed with a further five to ten, as well as conducting my own interviews as a recruiter and advising companies on how to conduct theirs.


The above post on The Club has inspired me to write about the different techniques that have been used during the interviews I attended this year, and the kind of tasks I was set.  I’ll also include some methods I’ve heard about being used, and briefly give my opinion on the advantages and disadvantages of each.  Hopefully this helps you to think about how you interview testers in your organisation, and perhaps inspires you to try some of the techniques described.


Please note that I won’t describe any technical coding tasks, as I don’t have enough personal experience of these to comment on their effectiveness.






Straightforward Questioning

Behavioural / Competency-based Questioning

Knowledge Questions

Industry and Community Awareness


At Home vs. On Site

Critical Thinking Games

Testing Requirements

Three Amigos

10 Minute Test Plan

Testing Example Software

Testing “Real” Software


My Recommendations and a Pinch of Salt





For the purposes of this post, “theory” refers to traditional interview techniques that do not require interviewees to test in any way.


Straightforward Questioning

What it is: Usually generic, unstructured questions that could be asked in an interview for any role.  Examples include:

  • What attracted you to this role?
  • What does a normal day look like in your current job?
  • Where do you see yourself in five years?

Main advantages: Allows interviewers to be direct about exactly what it is they want to know.

Main disadvantages: It’s very easy to predict and rehearse answers for this type of question, and interviewers are unlikely to learn anything about the candidate’s suitability for the position.


Behavioural / Competency-based Questioning

What it is: These questions usually start with, “Tell me about a time when…” and candidates are required to draw from real experiences (in work or personal life), or describe how they think a relevant scenario might play out if there are no real examples.

Main advantages: Gives interviewers an idea of how the candidate would respond in a real situation and can be scored to offer a more systematic way of comparing candidates.

Main disadvantages: It’s also possible to predict, practise and even fabricate answers for these questions.


Knowledge Questions

What it is: Whether written or oral, these questions are very similar to those found in a test or exam and are intended to determine candidates’ knowledge around specific subjects.  Examples include:

  • What is the Agile Manifesto?
  • What is regression testing?
  • Name the layers of the test automation pyramid

Main advantages: Similar to “straightforward questioning” described above, interviewers can be direct in finding out where candidates’ knowledge lies; written tests can be easily scored and used to rank candidates.

Main disadvantages: Many things in testing are very complex and cannot be reduced to a “right” or “wrong” answer; even where facts are available, the ability to memorise and recite these is not related to candidates’ testing skills.


Industry and Community Awareness

What it is: Questions designed to determine how invested candidates are in developing as testers.  Examples include:

  • How do you keep up with the latest developments in the testing and software industry?
  • What testers do you admire?
  • What testing events have you attended recently?

Main advantages: Helps interviewers to identify candidates who engage in testing-related activities outside of their normal roles and responsibilities.

Main disadvantages: Lack of community involvement does not necessarily indicate lack of interest or competency; candidates also may be restricted to the time and money they can invest outside of work (be careful not to discriminate).





For the purposes of this post, “practical” refers to interview techniques that typically require interviewees to test in some way.


At Home vs. On Site

What it is: Tasks or exercises that candidates are asked to complete either at home or as part of a face-to-face interview.  As well as testing tasks, this can include personality or general intelligence assessments.

Main advantages: Candidates might feel more relaxed completing tasks at home and so perform better, but interviewers can gain more insight by asking candidates to “think out loud” while running through exercises face-to-face.

Main disadvantages: Candidates might not have time to complete tasks at home (be careful not to discriminate) and could “cheat”.  Performing tasks during interview increases the time needed and candidates may be unable to get adequate time away from their current job or commitments in order to attend.


Critical Thinking Games

What it is: Problem solving or strategy games that are not necessarily directly linked to testing, such as the dice game or questions and assumptions; designed to demonstrate candidates’ critical thinking and problem solving skills.

Main advantages: As games may not be directly linked with testing, candidates may be more comfortable in showing their creativity and ability for abstract thought; may be particularly effective for junior candidates with limited practical testing experience.

Main disadvantages: The unfamiliar format may throw off some candidates; difficult to assess.


Testing Requirements

What it is: Candidates are asked to study a list of requirements and encouraged to ask questions and identify risks and gaps.  Candidates might also be asked to describe how they would test that the software meets these requirements.

Main advantages: Interviewers can gain an understanding of how candidates might test during the conception phases (shift left*), without needing to see the system under test; good if the successful candidate will have to explain their testing as part of the role.

Main disadvantages: This kind of scenario might not be a true reflection of the environment in which these skills are needed; it’s more likely that testers are not prompted for their input and need to be able to raise their concerns effectively, even when not invited to.


* I read a really good article on this a while back, but I’m having trouble finding it now and don’t want to link to Wikipedia 🙂


Three Amigos

What it is: Role-playing exercise based on the Three Amigos technique involving a tester (candidate) and two others playing the product owner and developer.  All three participants discuss requirements, user stories, and share ideas and / or concerns.

Main advantages: This exercise is likely to be closer to a real scenario than the “testing requirements” task described above, with the potential for other “amigos” to add personality challenges and counter-arguments; allows candidates to show how they participate in a group discussion and make their voice heard.

Main disadvantages: More challenging than some other tasks and candidates may underperform due to nerves or unfamiliarity with the format.


10 Minute Test Plan

What it is: Candidates are asked to create a test plan in ten minutes.  It could be written or drawn; on paper or whiteboard.  The time constraint is designed to force candidates to include only the most important aspects and see how they work under pressure.

Main advantages: Interviewers get a glimpse into how candidates create test plans and what they deem important to include; knowledge of test heuristics and mnemonics might also come to light.

Main disadvantages: Testers in different organisations might be required to include different information in test plans, rather than feel certain elements are less important; some candidates might never have been required to create test plans before, and so lack the necessary knowledge / experience.


Testing Example Software

What it is: Candidates are asked to test a publicly available application, or purpose built “dummy” software, as opposed to “real” software that the hiring company tests.

Main advantages: Interviewers can witness how candidates actually test software; “dummy” software can even be prepared with bugs or issues for candidates to find and investigate.

Main disadvantages: Example software used might be too basic or fundamentally different from the software that will be tested on the job to meaningfully predict performance.


Testing “Real” Software

What it is: Candidates are asked to test the same software that they would be testing if successful.

Main advantages: Interviewers can see how candidates interact with the software they’d actually be testing on the job, and identify approaches or skills that the existing team is lacking; candidates might find real bugs that were previously unidentified.

Main disadvantages: “Real” software might be deemed too complex or unfamiliar to use in an interview situation; it might be necessary to restrict candidates to certain areas of the application or workflow.



What it is: Candidates engage in pair testing with an interviewer or team member; instead of testing alone and being asked to “think out loud”, candidates are required to to constantly communicate and work with their testing partner.

Main advantages: Interviewers and testing partners can see how candidates interact and work with others; some candidates might feel more comfortable having a working conversation with someone about testing if “thinking out loud” makes them feel self-conscious.

Main disadvantages: Some participants might be distracted by how to pair “properly”, as opposed to focussing on testing; some candidates might shrink back to give their partner room, while others might rely too much on theirs.



My Recommendations and a Pinch of Salt


The comments on each of the techniques and tasks above are, of course, purely a reflection of my own experiences and perceptions.  Others may have a different opinion, based on their own experiences.  There are also a number of other techniques that I haven’t mentioned, so this list is by no means the “be all and end all”.


When it comes to deciding which are best for your own interviews, I would always encourage you to think about your own context in the business, including the team hiring and the position you’re recruiting for.  What kind of skills and experience do you need the successful candidate to have?  Which of these techniques will help identify these most effectively?


Not all interviews must (or should) follow the same structure, and it’s fine to experiment until you find something that works well for you, in your context.  Just make sure that candidates interviewing for the same position have a similar experience, in order to keep things fair.  You should try different methods during the next round of recruitment, as opposed to subjecting directly competing candidates to different processes.


Generally speaking, I’d recommend using a mixture of techniques and tasks from both the “theory” and “practical” groups, as it’s important to understand candidates’ motivations and team fit, as well as their abilities and potential.  Different candidates will also be comfortable with different methods, so including a variation will provide more opportunities for candidates to shine in different areas, which you might not see otherwise.


I would discourage from only using “theory” techniques, as I think it’s better to let candidates show what they can do, rather than relying on what they can tell you about it.  I’ve heard  some refer to this as “interviewing vs auditioning”.


Not everyone is comfortable boasting about their good qualities, so some candidates might not do themselves justice when questioned, while others might exaggerate their abilities.  There are even suggestions that traditional interview techniques lead to worse decisions.


There are also a growing number of claims that interviews don’t work, so please take everything with a pinch of salt during the recruitment process.  Although practical tasks help, it’s impossible to accurately predict a person’s job performance based on interviews alone, no matter how many stages or tasks you put them through.  Of course, we’d all like to make the perfect hire first time around, but that’s what probation periods are for – to see how candidates actually perform on the job.  You’ll never know until you let someone try.



What do you think about the techniques and tasks in this post?  Please share your stories about what has and hasn’t worked for you – either on the interviewer or interviewee side – in the comments.

11 thoughts to “Tester Interviews: Techniques and Tasks”

  1. Perhaps this was assumed somewhere, but I guess “tester” may be intended to mean people who perform testing activities after development level testing? If not, I was just wondering why there were no references to a tester knowing about statement testing vs path vs decision vs condition vs multiple-condition as well as boundary testing, etc?

    1. Hi Scott,

      Thanks for your comment.

      With this post, I tried not to concentrate on interviewing techniques for any particular kind of testing role or specific testing skill. Instead, I wanted to concentrate on the different types of interview methods themselves.

      That’s why I equally don’t reference user acceptance testing, accessibility, performance testing, etc. Any examples I give are only to illustrate how techniques might be applied, for clarity on the method.

      I don’t see any reason why the things you’ve mentioned couldn’t be interviewed for using some of the interview techniques described but, as noted, this is by no means an exhaustive list.

      Are there any good techniques you would recommend for these?



  2. Thank you Cassandra for this great write up.

    At my company we’ve recently revamped the interview proces. We noticed that the old interview was mostly focused on ‘traditional’ testing skills, but we are actually looking for testers that have a solid technical background and programming affinity.

    In order to better gauge candidate skills we decided to include an at home coding assignment, of which the candidate presents the results during the interview. This opens up all sorts of opportunities to have a discussion about their approach and decision making. It also shows you how they handle themselves when talking about their work.

    Something I would like to add is that it is important to continually review and improve your interview process, which is why we sent out a questionnaire to all candidates, asking them about their experience during the interviews, if they felt the assignment allowed them to showcase their abilities, etc. etc. Very valuable information in further improving your interviews.

    As a candidate, if you don’t make the cut, it can be very valuable to ask for some feedback afterwards, to see where you can improve.

    1. Hi,

      Thanks for your kind comments and sharing your own experiences.

      Great point about feedback! There’s always room to improve and different roles might call for a different approach. And what used to work might have an even better alternative.

      Equally, it’s useful for candidates to get feedback too. I have another piece in the making that covers these other areas 🙂



    2. I’m curious why you need your testers to have such good coding skills. Don’t you have programmers already? I can see the value of having these take-home “projects”. On the other hand, it’s asking a lot of someone to spend hours of their own time with no guarantee of employment. I recently spent 4 days on site at a prospective employer – but they paid me for my time. I did some coaching and training for them, as well as being interviewed and getting a chance myself to talk with many teams. That was fair – I was paid for my time. I didn’t accept the job, but there were no bad feelings either way.

      I’d rather pair with the person during work time and see how they interact with me and with other team members, than have them do a solo project. They might have awesome technical and coding skills, but if they aren’t good at communicating and collaborating, and don’t show a “I want to learn and contribute” mindset, I don’t want to hire them.

    3. @Lisa: Automation is a big part of what we do at the company where I’m working and projected to become even more important in the future. This means that our testers need to have a broad set of skills. That is why we increased the focus on automation in our interviews, while also looking at testing skills. So the focus didn’t so much shift to coding, but it expanded to include more.

      Unpaid assignments for interviews are not uncommon in my experience (Europe), but I realize its not for everyone. It could even be a two edged sword, some candidates might drop out of the procedure, but those that continue are motivated to work with us. I must say that I haven’t noticed people dropping out because of the assignment.

      I’ve toyed with the idea of pairing during interviews, but haven’t implemented it yet. Perhaps in the next iteration, because I do see the value.

      Thanks for your comment, it was a perspective I hadn’t considered yet.

  3. Wow, you really have put together a comprehensive list of interviewing techniques, I think the pros and cons are helpful.

    I hire for mindset and attitude, and as you point out, it’s hard to evaluate those with tricky games or knowledge questions. I’ve had good results with the behavioral type questions. I heard one on Twitter the other day that I plan to use – “Tell me about someone that you helped and how you helped them”.

    But my best results have come from pairing with the candidate. Even if they aren’t used to pairing, their willingness ot jump in and give it a try says something about them. I’m mostly interested in the questions they ask, and whether they can explain what they’re doing as they explore something. I can get an idea of how they learn. Our team needs people who are able to “pull” the information they need. We support them with a training plan, but we need people who aren’t afraid to ask for help. That’s just our environment. Many techniques you list would work well in other environments, I expect.

    1. Hi Lisa,

      Yeah, the article kind of grew and grew as I thought of more to include!

      That’s a great question. I like how it’s about helping. I’d be interested to learn what kind of answers that gets.

      Yes, I think it’s important to find something that works in your environment and it’s great to hear that your chosen techniques are working well for you.

      Thanks for sharing your thoughts!


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