C# & .NET 8 Architect Mastery
1. Memory Management & Performance
The CLR Deep Dive: Stack, Heap, and Garbage Collection (GC) Value Types vs Reference Types: Structs, Records, and Classes Span<T> and Memory<T>: Zero-copy high-performance code Benchmarking with Benchmark.DotNet: Measuring nano-seconds
2. Advanced Asynchronous Programming
Async/Await Internals: The State Machine and TaskContext ValueTask vs Task: Avoiding allocation in hot paths Task.WhenAll vs Parallel.ForEachAsync: Concurrency at scale Thread Safety & Multi-threading: Locks, Semaphores, and Interlocked
3. Modern C# 12+ Features
Primary Constructors & Collection Expressions Pattern Matching: Switch expressions and Recursive patterns Required Members & Init-Only properties Native AOT (Ahead of Time): Deployment for serverless/edge
4. Enterprise Design Patterns in .NET
Dependency Injection (DI): Lifetime management and Captive Dependencies The Options Pattern: Type-safe configuration management The Factory & Builder Patterns in Modern .NET Middleware Architecture: Building custom ASP.NET Core pipelines
5. Dynamic Programming & Reflection
Reflection & Attributes: Building custom frameworks Expression Trees: Building dynamic LINQ queries Source Generators: Compile-time code generation for speed Dynamic Types & ExpandoObject: When and when not to use them
6. Testing & Quality Architecture
Unit Testing Patterns: xUnit, Moq, and FluentAssertions Integration Testing with WebApplicationFactory Mutation Testing: Testing the quality of your tests TDD (Test Driven Development) for Senior Architects
7. Modern Web API Architectures
Minimal APIs vs Controllers: Choice of architecture Rate Limiting & Throttling in ASP.NET Core Versioning Strategies: URL vs Header vs Media Type Real-time Web with SignalR and WebSockets
8. FAANG .NET Architect Interview
Case Study: Designing a High-Throughput Payment Gateway in .NET Case Study: Solving Memory Leaks and CPU Spikes in Production
C# & .NET 8 Architect Mastery

Rate Limiting & Throttling in ASP.NET Core

1 Views Updated 5/4/2026

Protecting the API: Rate Limiting

An unprotected API is a target for Denial of Service (DoS) attacks. You must implement Rate Limiting to ensure that a single user cannot crash your server by sending 10,000 requests a second.

1. Fixed Window vs Sliding Window

  • Fixed Window: "100 requests per 1 minute." Simple, but users can 'Burst' at the boundary and double their limit if they time it right.
  • Sliding Window: More accurate. It calculates the limit based on the exact last 60 seconds, preventing boundary bursts.

2. Token Bucket Algorithm

This is the most flexible approach. You give each user a 'Bucket' of tokens. Every request consumes a token. The bucket 'Refills' at a steady rate. This allows users to burst occasionally but prevents sustained high-volume abuse.

3. Global vs User-Specific

Always implement **Global Throttling** to protect your database, and **User-Specific Throttling** (based on API Key or IP) to ensure fair usage among your customers.

4. Interview Mastery

Q: "What is 'Distributed Rate Limiting'?"

Architect Answer: "Memory-based rate limiting only works if you have 1 server. If you have 10 servers behind a Load Balancer, a user could send 100 requests to EACH server, bypassing your limit. We solve this by using **Redis** to store the rate limit counters centrally. All 10 servers check the same Redis key, ensuring the user is capped at 100 total requests regardless of which server they hit."

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C# & .NET 8 Architect Mastery
1. Memory Management & Performance
The CLR Deep Dive: Stack, Heap, and Garbage Collection (GC) Value Types vs Reference Types: Structs, Records, and Classes Span<T> and Memory<T>: Zero-copy high-performance code Benchmarking with Benchmark.DotNet: Measuring nano-seconds
2. Advanced Asynchronous Programming
Async/Await Internals: The State Machine and TaskContext ValueTask vs Task: Avoiding allocation in hot paths Task.WhenAll vs Parallel.ForEachAsync: Concurrency at scale Thread Safety & Multi-threading: Locks, Semaphores, and Interlocked
3. Modern C# 12+ Features
Primary Constructors & Collection Expressions Pattern Matching: Switch expressions and Recursive patterns Required Members & Init-Only properties Native AOT (Ahead of Time): Deployment for serverless/edge
4. Enterprise Design Patterns in .NET
Dependency Injection (DI): Lifetime management and Captive Dependencies The Options Pattern: Type-safe configuration management The Factory & Builder Patterns in Modern .NET Middleware Architecture: Building custom ASP.NET Core pipelines
5. Dynamic Programming & Reflection
Reflection & Attributes: Building custom frameworks Expression Trees: Building dynamic LINQ queries Source Generators: Compile-time code generation for speed Dynamic Types & ExpandoObject: When and when not to use them
6. Testing & Quality Architecture
Unit Testing Patterns: xUnit, Moq, and FluentAssertions Integration Testing with WebApplicationFactory Mutation Testing: Testing the quality of your tests TDD (Test Driven Development) for Senior Architects
7. Modern Web API Architectures
Minimal APIs vs Controllers: Choice of architecture Rate Limiting & Throttling in ASP.NET Core Versioning Strategies: URL vs Header vs Media Type Real-time Web with SignalR and WebSockets
8. FAANG .NET Architect Interview
Case Study: Designing a High-Throughput Payment Gateway in .NET Case Study: Solving Memory Leaks and CPU Spikes in Production