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Fidelity interview questions

45 questions29 coding1 system design15 behavioral5 freeUpdated

This is every question in the Fidelity guide, in one list: 29 coding problems, 1 system design and 15 behavioral questions, drawn from what candidates report about Fidelity interviews.

Each row shows the round it comes from and links to the lesson that works through it. 5 are free to read in full. The other 40 are Premium, and here you still see their round, difficulty and topic, so you know what you're walking into.

Open the Fidelity guide Unlock all 45

Fidelity coding interview questions

29 problems, in the order the guide teaches them. The 6 tagged OA are covered in the online assessment lessons. Each lesson gives the full problem, a worked solution and the follow-ups interviewers tend to add.

1Kth Nearest Prime to NFreeOAMediumJava Fundamentals & the OA
2Coin Change: Minimum CoinsFreeOAMediumJava Fundamentals & the OA
3BST Boundary TraversalFreeOAMediumJava Fundamentals & the OA
4Premium medium problemOAMediumCampus OA Problems
5Premium easy problemOAEasyCampus OA Problems
6Premium medium problemOAMediumCampus OA Problems
7Premium easy problemCodingEasyString Basics
8Premium easy problemCodingEasyString Basics
9Premium easy problemCodingEasyString Basics
10Premium easy problemCodingEasyString Basics
11Premium easy problemCodingEasyString Basics
12Premium easy problemCodingEasyLoops, Recursion and Lists
13Premium easy problemCodingEasyLoops, Recursion and Lists
14Premium easy problemCodingEasyLoops, Recursion and Lists
15Premium easy problemCodingEasyLoops, Recursion and Lists
16Premium easy problemCodingEasyLoops, Recursion and Lists
17Premium easy problemCodingEasyHash Maps and Arrays
18Premium medium problemCodingMediumHash Maps and Arrays
19Premium easy problemCodingEasyHash Maps and Arrays
20Premium easy problemCodingEasyHash Maps and Arrays
21Premium medium problemCodingMediumSearching, Sorting and Paths
22Premium easy problemCodingEasySearching, Sorting and Paths
23Premium medium problemCodingMediumSearching, Sorting and Paths
24Premium hard problemCodingHardSearching, Sorting and Paths
25Premium medium problemCodingMediumRunning Sums, Grids & SQL
26Premium medium problemCodingMediumRunning Sums, Grids & SQL
27Premium medium problemCodingMediumRunning Sums, Grids & SQL
28Premium medium problemCodingMediumRunning Sums, Grids & SQL
29Order ledger: submit orders and fold fills exactly onceFreeSystem designMediumDesign a Trading Platform

Fidelity system design interview questions

1 design, worked end to end in its own lesson, from requirements to the architecture and its trade-offs.

#Question
1Design a Trading PlatformFree

Fidelity behavioral interview questions

15 questions, grouped by what the interviewer is testing. The lesson explains why each one gets asked and what a strong answer covers.

Why Fidelity, and meaning it (3)

All 3 are Premium

Customer-first over real money (3)

All 3 are Premium

Ownership you can point to (3)

All 3 are Premium

Collaboration inside large systems (3)

All 3 are Premium

Ambiguity and legacy systems (3)

All 3 are Premium

Read the Fidelity behavioral questions

See all 45 Fidelity questions by name

Premium opens the 40 locked questions on this page, each with the full prompt and a worked answer, and every other lesson in all 100 company guides.

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Common questions

How many questions are in the Fidelity interview guide?

45: 29 coding problems, 1 system design and 15 behavioral questions. The guide was last updated in November 2026.

Which rounds do these Fidelity interview questions come from?

Of the 29 coding problems, 6 come from the online assessment, 22 from the coding rounds and 1 from the system design lessons. The one system design and 15 behavioral questions come from the system design and behavioral rounds. Every row in the list carries its round, so you can start with the one you have booked.

Which Fidelity interview questions are free?

5 of the 45 are free to read in full, marked Free in the list. The other 40 come with Premium, which also opens all 100 company guides.