BrowserStack.
A cloud testing platform giving instant access to 3,500+ real browsers and real iOS and Android devices for manual and automated testing.
its questions lean on
- machine coding from scratch
- streaming and push updates
- browser and OS internals
- networking
- database design
The rounds, as candidates describe them
- Online assessmentDSA problems; one candidate says two full solutions and one partial were needed to pass.source ↗
- Machine coding1.5 to 3 hours building a working program with no off-the-shelf libraries, most often a real-time log watcher like tail -f.source ↗
- Engineering manager / Director of EngineeringDeep dive on your current project, its architecture, scaling and fault tolerance.source ↗
- HRBehavioural questions and culture.source ↗
Reported by candidates
From public interview write-ups; each links its source.- Build a Real-Time Log Watcher like tail -f (Machine Coding)Low-level designW03 · DAY 03 · Backpressure and Flow Control →W00 · PART 4 · Networking Fundamentals for System Design →W00 · PART 5 · Operating System Concepts for System Design →reported in:LeetCode Discuss · BrowserStack Interview Experience, SDE 1 (2025) ↗LeetCode Discuss · BrowserStack SDE 2, India, August 2024 ↗LeetCode Discuss · BrowserStack SDE 1, Remote, April 2022 ↗
- Build a Web Service that Controls Browsers (Machine Coding)Low-level designW00 · PART 5 · Operating System Concepts for System Design →reported in:GeeksforGeeks · BrowserStack (Mumbai) Interview Experience, Software Engineer (2024) ↗GeeksforGeeks · BrowserStack Interview Experience, Senior Software Engineer (updated 2025) ↗GeeksforGeeks · BrowserStack Interview Experience Set 7, Fresher (updated 2025) ↗
- Design a Browser Automation System without SeleniumLow-level designW00 · PART 4 · Networking Fundamentals for System Design →reported in:LeetCode Discuss · BrowserStack Tech Lead, Mumbai (2022) ↗
- Design a Round-Robin Reverse ProxyLow-level designW00 · PART 2 · Infrastructure Building Blocks →IP-02 · Design a Rate Limiter →reported in:GeeksforGeeks · BrowserStack Interview Experience, Fresher (2024) ↗
- Design a Social Media Site and Its DatabaseSystem designIP-07 · Design a News Feed →SQ-21 · Instagram Feed and Stories →reported in:LeetCode Discuss · BrowserStack SE, Remote, April 2022 ↗
- Design the Database Schema for TwitterSystem designSQ-10 · Twitter/X →W01 · DAY 01 · Partitioning Deep-Dive →reported in:LeetCode Discuss · BrowserStack SDE 1, Remote, April 2022 ↗
- Write a Client Library Wrapping the BrowserStack REST APILow-level designW02 · DAY 01 · Timeout Hell →W02 · DAY 02 · Idempotency in Practice →reported in:GeeksforGeeks · BrowserStack Interview Experience Set 6, On-Campus (updated 2025) ↗
- How would you count the words in a very large file efficiently?ConceptW08 · DAY 02 · Streaming vs Batch Processing →W00 · PART 5 · Operating System Concepts for System Design →reported in:LeetCode Discuss · BrowserStack SE, Remote, April 2022 ↗
- How would you host a website without any external service?ConceptW00 · PART 4 · Networking Fundamentals for System Design →W00 · PART 2 · Infrastructure Building Blocks →reported in:LeetCode Discuss · BrowserStack SE, Remote, April 2022 ↗
Likely, from what they build
Our pick, not a report: questions that fit BrowserStack's products.- Design a Cloud Device Farm that Allocates Real Browsers and Phones to Test SessionsSystem designW09 · DAY 02 · Noisy Neighbor Prevention →IP-17 · Design a Distributed Job Scheduler →W01 · DAY 05 · Session Store Design →
- Design Live Streaming of a Remote Browser Session to the UserSystem designW03 · DAY 03 · Backpressure and Flow Control →W00 · PART 4 · Networking Fundamentals for System Design →
- Design a Test Logs and Results PipelineSystem designW08 · DAY 01 · Event Ingestion at Scale →W10 · DAY 02 · Observability →SQ-08 · AWS S3 →
Study path
Every lesson the questions above point to, once, in order.
- 01W03 · DAY 03Backpressure and Flow Control
- 02W00 · PART 4Networking Fundamentals for System Design
- 03W00 · PART 5Operating System Concepts for System Design
- 04W00 · PART 2Infrastructure Building Blocks
- 05IP-02Design a Rate Limiter
- 06IP-07Design a News Feed
- 07SQ-21Instagram Feed and Stories
- 08SQ-10Twitter/X
- 09W01 · DAY 01Partitioning Deep-Dive
- 10W02 · DAY 01Timeout Hell
- 11W02 · DAY 02Idempotency in Practice
- 12W08 · DAY 02Streaming vs Batch Processing
- 13W09 · DAY 02Noisy Neighbor Prevention
- 14IP-17Design a Distributed Job Scheduler
- 15W01 · DAY 05Session Store Design
- 16W08 · DAY 01Event Ingestion at Scale
- 17W10 · DAY 02Observability
- 18SQ-08AWS S3
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