Fidelity Investments Intern Software Full Stack Engineer Interview Questions (2026)
United States·12 interview reviews·Medium difficulty
Co-op Software Full Stack Engineer Interview Reviews
12One round with two problems in 45 min. If you've practiced patterns you're fine — narrate your approach before you code.
“Merge Intervals - Merge all overlapping intervals”
Recruiter screen, then a 45-minute coding round. Friendly interviewer. Results in a few days.
“Longest Substring Without Repeating Characters - Find the length of the longest substring without repeating characters”
Straightforward — two medium leetcode-tagged problems in 45 minutes. Very fast paced so watch the clock. Short behavioral at the end.
“Describe a time when you had to learn something quickly to complete a project”
Recruiter screen, then a 45-minute coding round. Friendly interviewer. Results in a few days.
“Two Sum - Given an array of integers and a target, return indices of the two numbers that add up to target”
Online assessment was tough, but the onsite technical was two standard LC-style problems. Interviewer wanted clear communication before coding.
“Hash map + interval or sliding window style”
Online assessment was tough, but the onsite technical was two standard LC-style problems. Interviewer wanted clear communication before coding.
“Hash map + interval or sliding window style”
One round with two problems in 45 min. If you've practiced patterns you're fine — narrate your approach before you code.
“BFS/graph or linked list manipulation”
Straightforward — two medium leetcode-tagged problems in 45 minutes. Very fast paced so watch the clock. Short behavioral at the end.
“Array or string manipulation + one follow-up”
The process was pretty straightforward. It started with an online assessment, followed by a phone screen, and concluded with a final round that had two LeetCode medium difficulty problems.
“LeetCode medium — tree / graph style problem”
Straightforward — two medium leetcode-tagged problems in 45 minutes. Very fast paced so watch the clock. Short behavioral at the end.
“Array or string manipulation + one follow-up”
Straightforward — two medium leetcode-tagged problems in 45 minutes. Very fast paced so watch the clock. Short behavioral at the end.
“Array or string manipulation + one follow-up”
The process was pretty straightforward. It started with an online assessment, followed by a phone screen, and concluded with a final round that had two LeetCode medium difficulty problems.
“LeetCode medium — tree / graph style problem”
About This Role
Frequently Asked Questions
How hard is it to get hired as a Co-op Software Full Stack Engineer at Fidelity Investments?
The interview difficulty is rated 2.9/5 by candidates. 60% report a positive experience. Emphasize JavaScript and React in your prep.
How long does the Fidelity Investments Co-op Software Full Stack Engineer hiring process take?
The process typically takes 2–6 weeks from application to final decision, depending on the hiring cycle and team availability.
What is the interview process like?
Most candidates go through a recruiter screen, followed by technical coding rounds, and a final interview loop. 52% of candidates applied online.
What questions are asked in a Fidelity Investments Co-op Software Full Stack Engineer interview?
Common topics include data structures & algorithms, system design for some teams, and behavioral STAR stories. Practice with our AI voice interviewer to tighten delivery.
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