Analyst/Medical Writer applicants have rated the interview process at Costello Medical with 3.8 out of 5 (where 5 is the highest level of difficulty) and assessed their interview experience as 50% positive. To compare, the company-average is 50% positive. This is according to Glassdoor user ratings.
Candidates applying for Analyst/Medical Writer roles take an average of 21 days to get hired, when considering 4 user submitted interviews for this role. To compare, the hiring process at Costello Medical overall takes an average of 27 days.
Common stages of the interview process at Costello Medical as a Analyst/Medical Writer according to 4 Glassdoor interviews include:
Group panel interview: 33%
Skills test: 33%
One on one interview: 17%
Presentation: 17%
Here are the most commonly searched roles for interview reports -
I applied online. The process took 6 weeks. I interviewed at Costello Medical (London, England) in Mar 2020
Interview
Very long interview process including submitting CV and cover letter, and completing an assignment involving 5 short questions and an essay question. There was then an interview that included giving a presentation that had been prepared prior to the interview and answering questions on the presentation. This was followed by an interview with 2 managers and then the department head. After the interview I had to do a proof reading exercise.
Overall a very long process, and with no offer, and no offer of feedback, I have been left feeling it was a very long process and a waste of time. The company should consider having their HR department conduct phone interviews with candidates earlier on in the process to determine suitability for the role.
I passed CV screening and went about the first round (proofreading + writing assessment). They gave me a week for that; the writing assessment involved answering some questions based on a research article, and the proofreading assessment involved making 50+ edits to an article and writing a 300 word summary of an article in 1 hour.
The recruiter + some others review it, and I was then invited to the final stage interview in Boston. It was further away, so I did it virtually -- 15 min presentation w/ questions to an analyst + senior analyst, you present on a report with a similar topic to the writing assessment, and 45 min behavioral interview with a more senior leader. Interview ran long (they ask a lot of presentation followups) and I ended 25 minutes past the timeframe haha, but all good I hope. Interviewers were all sweet and gave gentle feedback/broadened some of your responses in the moment, if needed. It was a bit tough, but make sure to prepare well, and you got this! Still waiting to hear back and will update the result later.
Interview questions [1]
Question 1
Tell me about yourself/why this role? Why Costello specifically?
What would you do if a client told you that you made a mistake in your work?
What kind of culture are you looking for in your workplace?
A time you managed multiple deadlines?
Your background in science and/or writing?
Make sure to ask your interviewers some good questions!
I applied through an employee referral. I interviewed at Costello Medical (London, England) in Feb 2026
Interview
1st stage: submitting CV
if you pass the CV screen: Timed proofreading test and an assessment on a paper on drug discovery
The timed proofreading test was very challenging and required attention to detail and staying cool underpressure.
I applied through an employee referral. I interviewed at Costello Medical in Nov 2025
Interview
Starts with CV and Cover letter. Then a scientific writing and timed proofreading assessment. Finally, a presentation and Behavioural + Technical interview, followed by an interview with the Head of Department.
Interview questions [1]
Question 1
Why Costello? Why are you a good candidate? How would you handle conflicting feedback? How do you deal with mistakes? Do you have experience with scientific communication?