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Prep/Companies/BrowserStack

SaaS & dev tools · Mumbai (with a Dublin office)

B

BrowserStack.

A cloud testing platform giving instant access to real browsers and real iOS and Android devices (its site now cites 35,000+ real 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 design
W03 · 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 design
W00 · 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 design
W00 · PART 4 · Networking Fundamentals for System Design →reported in:LeetCode Discuss · BrowserStack Tech Lead, Mumbai (2022) ↗
Design a Round-Robin Reverse ProxyLow-level design
W00 · 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 design
IP-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 design
SQ-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 design
W02 · 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?Concept
W08 · 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?Concept
W00 · 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 design
W09 · 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 design
W03 · DAY 03 · Backpressure and Flow Control →W00 · PART 4 · Networking Fundamentals for System Design →
Design a Test Logs and Results PipelineSystem design
W08 · 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

Company names and logos are trademarks of their owners, shown only to identify each company. This course isn't affiliated with or endorsed by any of them.

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