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Kafka RabbitMQ Courses 2026: Yandex vs Slerm

https://sudonull.com/kafka-rabbitmq-courses-2026-yandex-vs-slerm

Comparison of Yandex Praktikum and Slerm courses on Kafka, RabbitMQ. KRaft, highload, Docker stands, reviews. Choose format for middle/senior devs and start learning.

Coexistence of legacy code in high-load systems

https://sudonull.com/coexistence-of-legacy-code-in-high-load-systems

Learn why removing legacy code is risky and how to apply feature toggles for safe coexistence in Spring Boot. Strategies for middle/senior dev without refactoring risks. Practical examples.

Fastify Optimization: Bloom Filters and Scalable Backends

https://sudonull.com/fastify-optimization-bloom-filters-and-scalable-backends

Explore practical solutions for creating a high-load backend on Fastify: custom IDs, Bloom filters for users and images, loginless authorization, asynchronous DB writes, API protection, and TypeScript typing.

QR Ticket Validation Design for Cinemas

https://sudonull.com/qr-ticket-validation-design-for-cinemas

Breakdown of System Design for QR Ticket Validation: offline signature, idempotency, atomic updates. Solving timeouts and HoL blocking for high-load. Practical SQL examples.

Kafka Safety Window: retention monitoring

https://sudonull.com/kafka-safety-window-retention-monitoring

Learn how to prevent data loss in Kafka due to retention.bytes. Implement Data Safety Window in Grafana with PromQL. Tuning case for high-load topics — instructions for Platform Engineers.

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