DeepRound field notes
Practical guides for tech interviews, from runtime fundamentals to explaining production trade-offs clearly.
A backend interview study map for 2027: where to go deeper in databases, concurrency, reliability, performance, architecture, and security.
A simple purchase query stalls while another transaction stays open. Follow the blocker and see why fast SQL can still mean a slow API.
Diagnose connection pool contention in Go with database/sql metrics, PostgreSQL observations, and a reproducible comparison of larger pools and shorter transactions.
Trace N+1 queries from SQLAlchemy models to the SQL they emit, compare selectinload with joinedload, and see how relationship loading affects pagination.
Investigate a slow PostgreSQL query with EXPLAIN ANALYZE, test a composite index, then compare deep OFFSET and cursor pagination in a reproducible SQL lab.
Practice 10 PHP backend interview questions with answers and code examples covering PHP-FPM, strict types, Composer, SQL, queues, and application security.
Go interview topics and questions covering strings, slices, maps, interfaces, goroutines, channels, context, synchronization, and backend reliability.
Representative Node.js backend interview questions covering the event loop, TypeScript boundaries, streams, concurrency, memory, and reliable production systems.
A practical preparation plan for backend interviews: what to study, how to practice explaining trade-offs, and what to do in the final week.
A reusable framework for giving clear, senior-level answers when an interview question has no single correct solution.
Representative Python backend interview questions with the concepts, trade-offs, and follow-ups a strong answer should address.
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