https://varnaudov.com/en/blog/ Articles on backend architecture, e-commerce SaaS and production systems. en Mon, 21 Sep 2026 17:22:32 GMT https://varnaudov.com/en/blog/multi-tenant-ecommerce-saas-go/ https://varnaudov.com/en/blog/multi-tenant-ecommerce-saas-go/ Mon, 21 Sep 2026 00:00:00 GMT Architecture notes on building a multi-tenant e-commerce SaaS with Go, PostgreSQL, Redis and NATS — tenant isolation, request flow and lessons learned. https://varnaudov.com/en/blog/background-workers-go-nats/ https://varnaudov.com/en/blog/background-workers-go-nats/ Mon, 14 Sep 2026 00:00:00 GMT How to move email, imports, exports and integrations off the HTTP request path using Go workers and NATS — retries, idempotency and graceful shutdown. https://varnaudov.com/en/blog/reliable-payment-integrations/ https://varnaudov.com/en/blog/reliable-payment-integrations/ Mon, 07 Sep 2026 00:00:00 GMT Production lessons for payment integrations — checkout flow, webhooks, signature verification, duplicates, idempotency and payment state machines. https://varnaudov.com/en/blog/redis-in-production/ https://varnaudov.com/en/blog/redis-in-production/ Mon, 31 Aug 2026 00:00:00 GMT Real Redis usage in production — cache invalidation, TTL, locks, rate limiting, memory and what happens when Redis goes down. https://varnaudov.com/en/blog/scalable-product-import-ecommerce/ https://varnaudov.com/en/blog/scalable-product-import-ecommerce/ Mon, 24 Aug 2026 00:00:00 GMT How to design product imports for large catalogs — CSV/XML/JSON/XLSX, mapping, validation, workers, batching, progress and memory-safe processing. https://varnaudov.com/en/blog/idempotent-apis/ https://varnaudov.com/en/blog/idempotent-apis/ Mon, 17 Aug 2026 00:00:00 GMT Practical idempotency for APIs — double clicks, duplicate webhooks, worker retries, idempotency keys and unique constraints. https://varnaudov.com/en/blog/postgresql-at-scale/ https://varnaudov.com/en/blog/postgresql-at-scale/ Mon, 10 Aug 2026 00:00:00 GMT PostgreSQL performance lessons — EXPLAIN ANALYZE, indexes, N+1, pagination, locking, pooling and real before/after cases. https://varnaudov.com/en/blog/multi-provider-shipping-architecture/ https://varnaudov.com/en/blog/multi-provider-shipping-architecture/ Mon, 03 Aug 2026 00:00:00 GMT How to design a multi-courier shipping layer — provider interface, adapters, labels, tracking and pickup points without breaking the core system. https://varnaudov.com/en/blog/scalable-monolith-vs-microservices/ https://varnaudov.com/en/blog/scalable-monolith-vs-microservices/ Mon, 27 Jul 2026 00:00:00 GMT When a modular monolith plus workers beats premature microservices — boundaries, events, deployment simplicity and when to extract a service. https://varnaudov.com/en/blog/years-of-backend-development/ https://varnaudov.com/en/blog/years-of-backend-development/ Mon, 20 Jul 2026 00:00:00 GMT Reflections from 16 years of backend work — what compounds: debugging, databases, APIs, simplicity, monitoring, communication and trade-offs.