Designing a Multi-Tenant B2B SaaS Without Microservices
How to build high-scale multi-tenant applications using a unified modular monolith with PostgreSQL Row-Level Security, connection pooling, and background worker queues.
Demonstrating how I think about systems, concurrency, data isolation, and trade-offs before writing a single line of code.
Anyone can assemble a stack from trendy framework tutorials. But production systems fail at the boundaries: race conditions, unindexed queries, cascading API timeouts, multi-tenant data leaks, and fragile state synchronization.
Below are real architectural breakdowns from systems I have designed and deployed. For every system, I explicitly answer:
How to build high-scale multi-tenant applications using a unified modular monolith with PostgreSQL Row-Level Security, connection pooling, and background worker queues.
Handling millions of concurrent incoming financial transactions and cross-border webhooks with sub-millisecond ingestion, strict deduplication, and zero message loss.
Architecting browser-based CAD and inspection mapping for non-destructive testing (NDT), processing 100,000+ ultrasonic wall-thickness data points without UI freezing in zero-connectivity environments.
Engineering mobile applications that work with zero latency in subways, airplanes, and rural areas, synchronizing automatically without race conditions or data loss.
Moving beyond naive prompt chaining. How to engineer reliable, deterministic AI systems with structured JSON schemas, semantic caching, token budget guards, and circuit breakers.
Architecting e-commerce infrastructure supporting 500,000+ SKUs with multi-attribute faceted filtering, sub-30ms search response times, and zero database lockups during flash sales.
From multi-tenant data partitioning to high-throughput webhook ingestion, I partner with founders as a Fractional CTO or Lead Architect.