BT Group SWE interview questions - full 2026 list
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Behavioral
- 70
System Design
- 41
Technical Discussion
- 37
Coding
- 34
Product Architecture
- 13
Decomposition
- 6
Bug squash / Bugfixing
- 2
Technical
- 1
Software Engineer
Role: System Design
Time Frame: 2 months ago
Question: Develop a service for filtering and moderating content.
Company: BT Group
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Software Engineer
Role: System Design, Technical Discussion
Time Frame: 2 months ago
Question: Can you sketch out the logic for a Least Recently Used cache from the ground up
Company: BT Group
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Software Engineer
Role: System Design, Technical Discussion, Product Architecture
Time Frame: 2 months ago
Question: Contrast the responsibilities of a standard load balancer with those of an API gateway
Company: BT Group
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Software Engineer
Role: Coding
Time Frame: 2 months ago
Question: Longest Consecutive Sequence Determine the length of the longest consecutive elements sequence.
Company: BT Group
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Software Engineer
Role: Technical Discussion
Time Frame: 3 months ago
Question: Break down the benefits of a non-blocking architecture compared to traditional thread per request models
Company: BT Group
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Software Engineer
Role: System Design, Product Architecture, Decomposition, Technical Discussion
Time Frame: 3 months ago
Question: Sketch out a global directory system that allows users to filter local results by category and precise distance
Company: BT Group
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Software Engineer
Role: System Design, Technical Discussion
Time Frame: 4 months ago
Question: Relational schemas offer safety while document stores offer flexibility so where do you draw the line
Company: BT Group
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Software Engineer
Role: System Design, Technical Discussion
Time Frame: 4 months ago
Question: Design a system to count the number of hits received in the past 5 minutes.
Company: BT Group
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Software Engineer
Role: System Design, Technical Discussion
Time Frame: 4 months ago
Question: Contrast the architecture of an AP system with a CP system using real-world examples
Company: BT Group
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Software Engineer
Role: Coding
Time Frame: 5 months ago
Question: Find the K closest points to the origin. Given an array of points where points[i] = [xi, yi] represents a point on the X-Y plane and an integer k, return the k closest points to the origin (0, 0).
Company: BT Group
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Note
*All interview questions are submitted by recent BT Group Software Engineer candidates, labeled and categorized by Prepfully, and then published after being verified by Software Engineers at BT Group.