backend

Understand ProxySQL hostgroups: what they are, how they route MySQL traffic, common use cases, pitfalls, Galera cluster integration, and running multiple ProxySQL instances across data centers.

Learn how to use ProxySQL as a connection pooler between PHP applications and MySQL, dramatically reducing connection overhead and improving database scalability.

A deep dive into the new APIs and libraries in Java 25, including Scoped Values, the Key Derivation Function API, Stable Values, PEM Encodings, and the Vector API.

Real senior Python interview questions from a top outsourcing company in Vietnam — covering data structures, memory management, async concurrency, database optimization, and code quality.

Learn how NestJS modules work: feature modules, shared modules, global modules, dynamic modules, and how the module system organizes your application architecture.

Understand Docker images and containers from scratch. Learn what they are, how they differ, and run your first container with hands-on examples in under 30 minutes.

Learn how to handle two of the most common Docker production failures: image pull errors on deploy and database connection failures on startup. Practical patterns with healthchecks, retry logic, and rollback strategies.

Microservices promise scalability and independence, but they come with a hidden complexity tax that teams pay in distributed tracing, operational overhead, and cognitive load. Here's what the tutorials skip.

Compare Redis, Memcached, and local in-process caching solutions. Learn when to use each, their strengths and trade-offs, architecture patterns, and practical implementation examples for building high-performance applications.

Learn how to design and build ingestion APIs for IoT systems — handling high-throughput device data, batching, validation, backpressure, and storage strategies with practical examples.