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Backend

Java Socket Programming: Build a Client-Server Chat App

A step-by-step guide to Java socket programming: ports and TCP, ServerSocket and Socket, sending chat messages with object serialization, and a multi-client server with a thread per client.

Sep 24, 202610 min read

Backend

Java OOP: The Four Pillars Explained With Examples

Learn the four pillars of Java OOP with working examples: encapsulation and access modifiers, inheritance with extends and super, overriding vs overloading, and abstraction with interfaces.

Sep 24, 20269 min read

Backend

Java Class vs Object: Constructors, References and Equality

Learn how a Java class and object relate: constructor rules, what new does, references, == vs equals, toString, pass by value, overloading, and abstract classes vs interfaces.

Sep 24, 202610 min read

Backend

Redis Caching: Data Structures, TTL and Persistence

A practical guide to Redis caching: the cache-aside pattern in Go, data structures and their use cases, TTL and eviction policies, why single-threaded Redis is fast, RDB vs AOF, and Pub/Sub basics.

Sep 24, 202610 min read

Backend

RabbitMQ Exchange Types and Reliable Messaging

Learn the four RabbitMQ exchange types (direct, fanout, topic, headers) with Go examples, plus publisher confirms, durable quorum queues, manual acks, dead letter exchanges and prefetch.

Sep 24, 202610 min read

Backend

Preventing Race Conditions in Payment Systems

A practical guide to preventing race conditions in payment systems: atomic conditional updates, SELECT FOR UPDATE, optimistic locking, multi-row rules, and idempotency keys that stop double charges.

Sep 24, 202610 min read

Backend

Transaction Isolation Levels, Write Skew and SSI

Learn what each transaction isolation level allows, how PostgreSQL implements Read Committed and Repeatable Read, why write skew slips past row locks, and how SSI makes SERIALIZABLE safe.

Sep 24, 202610 min read

Backend

Hexagonal Architecture in Go: Ports and Adapters Explained

Learn hexagonal architecture (ports and adapters): keep the domain at the center, define driving and driven ports, write HTTP and Postgres adapters in Go, test with fakes, and know when it's overkill.

Sep 24, 202610 min read

Backend

Go Quickselect and Sorting: slices.Sort to Top-K in O(n)

Learn sorting in Go with sort and slices, frequency counting with maps, Lomuto partition and quicksort, then Go quickselect to find the k-th element and top-k frequent values in O(n) average time.

Sep 24, 202610 min read

Showing 10-18 of 35 articles

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