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Distributed systems
Consistency, messaging, failure modes, retries, event-driven architecture, and boundaries between services.
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Database internals
Indexes, query planning, locking, isolation levels, transactions, and diagnosing database performance.
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Delivery and operations
CI/CD architecture, deployment strategies, infrastructure, observability, and production ownership.
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CRUD
When simple create, read, update, and delete operations are enough, and when domain operations are clearer.
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gRPC
Protocol Buffers, contract evolution, streaming calls, retries, deadlines, and service boundaries.
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Technical communication
Explaining architecture, system behaviour, and trade-offs clearly without losing important details.
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Interview readiness
Refreshing backend fundamentals and practising concise explanations of technical decisions.