Lyft·Software Engineer·Onsite - System Design / Architecture
Jun 2026
Lyft system design round for a software engineering role. The main question was a distributed web crawler, and the follow-ups kept coming in waves, coordination, fault tolerance, load balancing. Left feeling like I covered the basics but probably didn't go deep enough on the trickier parts.
- Design a distributed web crawler that starts from a single seed URL and spreads the work across 1,000 machines. Walk through coordination between nodes, load balancing, fault tolerance, and how the system scales.
“I started with a URL frontier and a central queue, which felt right, but then they pushed on what happens when a node dies mid-crawl and I kind of stumbled.” The rest of the author's notes on Software Engineer interview at Lyft, Onsite - System Design / Architecture round, covers how they worked through the question, what the panel pushed back on, and what they would do differently.
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