Technical Guides & Engineering Knowledgebase

Production engineering guides on .NET, ASP.NET Core, SQL Server performance, AI agents, and enterprise architecture by Abdur Rahim.

• Redis Caching Patterns in ASP.NET Core: Cache-Aside, Stampede Protection & Distributed Locking — A practical, production-tested guide to Redis caching in ASP.NET Core — cache-aside with IDistributedCache, jittered TTLs, cache stampede prevention with distributed locks, and cache invalidation strategies that don't leave stale data behind.
• PostgreSQL vs SQL Server Indexing & Query Plans: A Field Guide for .NET Developers — A practical comparison of indexing strategy, execution plans, and EF Core behavior across PostgreSQL and SQL Server — for .NET teams migrating between engines or running both, with real EXPLAIN and execution-plan output.
• .NET 9/10 Performance Deep Dive: Span<T>, Memory Pooling, AOT & GC Tuning — A production-grade tour of .NET 9/10 performance engineering — Span<T> and stack allocation, ArrayPool and object pooling, Native AOT compilation, Server GC tuning, and a repeatable BenchmarkDotNet methodology for proving every claim.
• How to Deploy ASP.NET Core to IIS & Troubleshoot 502 / 500.30 Startup Errors — Production guide for configuring IIS, the ASP.NET Core Hosting Bundle, In-Process hosting, AppPool permissions, and diagnosing 502 / 500.30 startup errors.
• Building Production AI Agents & LLM Tool Calling in .NET with C# — Designing resilient AI agents in C# with Semantic Kernel, OpenAI & Claude APIs, strict JSON schema enforcement, and deterministic tool execution pipelines.
• Clean N-Tier Architecture in ASP.NET Core: Decoupling Domain, Data, & WebApp — Decoupling Core domain logic, Infrastructure, and WebApp presentation in enterprise ASP.NET Core applications for testability and maintainability.
• High-Performance SQL Server Workloads with C# & SqlBulkCopy — How to eliminate ORM overhead and stream bulk inserts, updates, and merges past 100,000 rows/sec in SQL Server using C# and SqlBulkCopy.
• Integrating Nafath Identity & Biometric Verification in ASP.NET Core — Architectural guide to integrating Nafath National SSO into .NET backends — asynchronous verification state machine and biometric prompt handling.
• Securing ASP.NET Core Web APIs: Rate Limiting, JWT Hardening, & Defense in Depth — Hardening ASP.NET Core Web APIs against DDoS and auth flaws using PartitionedRateLimiter, strict JWT validation, and defense-in-depth middleware.