https://ozgurgurcan.com/blog Ozgur Gurcan's personal website & engineering blog — deep dives into backend systems, distributed architectures, and pragmatic tooling. en-us ozgurgurcan1996@gmail.com (Ozgur Gurcan) ozgurgurcan1996@gmail.com (Ozgur Gurcan) Thu, 17 Sep 2026 00:00:00 GMT https://ozgurgurcan.com/blog/ditching-paas-self-hosting-my-stack-with-coolify https://ozgurgurcan.com/blog/ditching-paas-self-hosting-my-stack-with-coolify Why and how I migrated my personal projects to a self-hosted Coolify instance, setting up multi-stage Docker builds, automated SSL via Traefik, and Git push-to-deploy. Thu, 17 Sep 2026 00:00:00 GMT ozgurgurcan1996@gmail.com (Ozgur Gurcan) coolifyself-hostingdockerdevopsnextjs https://ozgurgurcan.com/blog/building-an-autonomous-code-review-bot-with-mcp-and-n8n https://ozgurgurcan.com/blog/building-an-autonomous-code-review-bot-with-mcp-and-n8n How we automated contextual merge request reviews by combining Model Context Protocol (MCP), vector embeddings over our documentation, and Slack workflows. Tue, 10 Feb 2026 00:00:00 GMT ozgurgurcan1996@gmail.com (Ozgur Gurcan) aimcpn8nautomationproductivity https://ozgurgurcan.com/blog/java-25-and-spring-boot-4-virtual-threads https://ozgurgurcan.com/blog/java-25-and-spring-boot-4-virtual-threads Lessons from upgrading 16+ production microservices to Java 25 and Spring Boot 4: diagnosing carrier thread pinning, tuning HikariCP connection pools for virtual threads, and achieving SonarQube Grade A. Wed, 05 Nov 2025 00:00:00 GMT ozgurgurcan1996@gmail.com (Ozgur Gurcan) javaspring-bootvirtual-threadsperformancejvm https://ozgurgurcan.com/blog/multi-datacenter-active-active-at-scale https://ozgurgurcan.com/blog/multi-datacenter-active-active-at-scale Architectural breakdown of running checkout services active-active across two datacenters at 7M RPM: XDCR conflict resolution, Kafka mirroring, progressive zone shutdowns, and holding p99 at 63ms under chaos testing. Thu, 18 Sep 2025 00:00:00 GMT ozgurgurcan1996@gmail.com (Ozgur Gurcan) distributed-systemsmulti-datacenteractive-activekafkacouchbasechaos-engineering https://ozgurgurcan.com/blog/zero-downtime-database-migration-couchbase-to-postgresql https://ozgurgurcan.com/blog/zero-downtime-database-migration-couchbase-to-postgresql How we migrated a critical production service from Couchbase to PostgreSQL with zero downtime, dual-write synchronization, and automated consistency verification. Wed, 14 May 2025 00:00:00 GMT ozgurgurcan1996@gmail.com (Ozgur Gurcan) architecturepostgresqlcouchbasedatabase-migrationzero-downtime https://ozgurgurcan.com/blog/dynamic-limit-allocation-on-32tb-data-with-bigquery https://ozgurgurcan.com/blog/dynamic-limit-allocation-on-32tb-data-with-bigquery How querying a 32 TB coupon analytics dataset in BigQuery exposed massive promotional waste, unmasked a silent country-level zero-coupon script bug, and inspired an automated dynamic allocation algorithm. Wed, 22 Jan 2025 00:00:00 GMT ozgurgurcan1996@gmail.com (Ozgur Gurcan) bigquerydata-engineeringalgorithmsoptimizationbackend https://ozgurgurcan.com/blog/taming-the-n-plus-1-problem-at-scale https://ozgurgurcan.com/blog/taming-the-n-plus-1-problem-at-scale Redesigning our core domain data model: embedding related entities into single documents to eliminate up to 200 DB reads per request and saving 780 GB of disk. Wed, 20 Nov 2024 00:00:00 GMT ozgurgurcan1996@gmail.com (Ozgur Gurcan) system-designperformancedistributed-systemshigh-throughput https://ozgurgurcan.com/blog/resilience-patterns-for-event-driven-architectures https://ozgurgurcan.com/blog/resilience-patterns-for-event-driven-architectures Lessons learned from peak campaign traffic: implementing transactional outbox, idempotent consumers, circuit breakers, and bulkhead isolation in Spring Boot. Thu, 12 Oct 2023 00:00:00 GMT ozgurgurcan1996@gmail.com (Ozgur Gurcan) kafkaspring-bootresilienceevent-drivendistributed-systems