Braze is the leading customer engagement platform — focuses on mobile marketing, push notifications, in-app messages. Public since 2021. The interview emphasizes high-throughput message delivery, ML-driven personalization, and the unique scale challenges of consumer messaging.
Process
Recruiter screen → 60-minute coding phone (DSA medium) → onsite virtual: 2 coding, 1 system design, 1 craft deep-dive, 1 behavioral. Cycle: 3–4 weeks.
What they actually ask
- Design a push notification platform handling billions of sends per day. Interviewers probe how you fan out a single campaign to millions of devices without overwhelming APNs and FCM — expect queueing, batching, retries, and delivery guarantees. Decouple campaign ingestion from delivery workers with a message queue, and be ready to explain how you’d rate-limit per provider so you don’t get throttled.
- Design segmentation and audience targeting at scale. The hard part is evaluating segment membership — users matching a set of attribute and behavior filters — across hundreds of millions of profiles fast enough to launch a campaign. Be ready to weigh precomputed segments against real-time evaluation, and to discuss indexing the attributes you filter on and how you’d shard the profile store.
- Design A/B testing for marketing campaigns. Focus on assigning users to variants deterministically (consistent hashing, so a user always lands in the same bucket), tracking exposures and conversions, and measuring statistical significance before you call a winner. A common follow-up is holdout groups and keeping a user in one experiment from being skewed by another.
- Coding: medium DSA, often with stream processing framing — for example, computing a rolling count of events per user over a time window or deduplicating a stream of messages. Drill the sliding window and hash-map patterns so a stream-shaped prompt maps onto something you already know cold.
- Behavioral: customer focus, ownership, and working in a mature SaaS org. Expect a time you dug into a customer problem or owned an incident end to end; structure answers with the STAR method and lead with business impact, since Braze is heavily customer-driven.
Levels and comp (2026)
- SE II: $155K–$195K total
- Senior SE: $225K–$295K
- Staff: $325K–$430K
- Principal: $460K–$610K
Prep priorities
- Be fluent in Java or Scala (bulk of the codebase). Write idiomatic code in an interview rather than pseudocode, and know your collections, concurrency primitives (threads, executors, futures), and the JVM memory model well enough to reason about a high-throughput service.
- Understand stream processing (Kafka, Flink) and high-throughput pipelines. Be able to explain partitioning, consumer groups, offset management, and how you’d handle backpressure from a slow consumer. A likely question is guaranteeing at-least-once versus exactly-once delivery when a worker crashes mid-batch.
- Brush up on push notification protocols (APNs, FCM). Know how device tokens are registered and rotated, how payload size limits and priority flags work, and what happens when a token goes stale — including how provider feedback on bounces and uninstalls loops back into cleaning your audience.
Frequently Asked Questions
Is Braze remote-friendly?
Hybrid in NYC (HQ), London, Tokyo. Many engineering roles fully remote within US.
How does Braze compare to Customer.io or Iterable?
Braze is largest by enterprise customers. Iterable is comparable. Customer.io is more developer-friendly. Braze pays comparable to mid-tier SaaS.
What is the engineering culture?
Mature, customer-driven, mid-stage. Strong work-life balance.
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