Senior Software Engineer, Ads Platform at Roblox — build ads infrastructure serving hundreds of millions of users

Interview for Roblox's Ads Platform team, where you'd architect backend systems for ads serving and delivery at massive scale, working across ML, backend, and analytics engineers. This role expects 5+ years shipping complex production systems and hands-on depth in distributed systems, messaging, and storage technologies.

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What this interview tests

Distributed systems design for high-scale ads serving
Kafka/Flink-based streaming pipelines
Distributed SQL/NoSQL data modeling
REST/gRPC microservices and containerized architecture
Technical leadership and cross-team collaboration (ML, backend, analytics)

Common question themes

System design: build an ads serving/delivery pipeline that scales to hundreds of millions of users

Deep dive on a production system you built with Kafka/Flink/Redis — what broke and how you fixed it

How you've mentored engineers and led technical direction without formal authority

Tradeoffs in distributed systems: correctness vs. latency vs. reliability at scale

Coding/proficiency check in a systems language (C#, Go, Rust, Java, C++, or Python)

How candidates describe it

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