Design a real-time chat application like Slack or WhatsApp — PayPal interview
Reported in PayPal USA engineering loops. Mid-to-senior design spanning WebSockets, message storage, and presence.
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Reported in PayPal USA engineering loops. Mid-to-senior design spanning WebSockets, message storage, and presence.
Reported in PayPal USA engineering loops. Caching patterns for system design and backend performance tuning.
Reported in PayPal USA engineering loops. Infrastructure design question covering L4/L7 balancers and health checks.
Reported in PayPal USA engineering loops. Frequently asked in US system design rounds for CDN, cache, and sharding topics.
Reported in PayPal USA engineering loops. Product + system design hybrid common at Meta, Twitter/X, LinkedIn, and Reddit US offices.
Reported in PayPal USA engineering loops. Senior system design combining sharding, eviction, consistency, and observability.
Reported in PayPal interview loops. System design problem testing reliability, fan-out, and channel abstraction.
Reported in PayPal interview loops. System design interview around indexing, ranking, and freshness.
Reported in PayPal interview loops. Critical design topic focused on correctness under retries and failures.
Reported in PayPal interview loops. Observability architecture interview question for platform roles.
Reported in PayPal interview loops. System design exercise emphasizing control plane and low-latency reads.
Reported in PayPal interview loops. System design topic around edge caching, invalidation, and latency.
Reported in PayPal interview loops. Object model design for template rendering and channel-specific formatting.