Santosh Kumar Singh

Santosh Kumar Singh

Principal Software Engineer with 17+ years of experience architecting scalable systems and leading high-performing engineering teams. I specialize in translating complex business requirements into robust, maintainable software solutions that drive measurable impact.

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Pages

Posts

Real-Time Systems in .NET: SignalR Architecture and Scaling

1 minute read

Published:

This post covers real-time systems in .NET using SignalR. SignalR lets servers push messages to connected clients over WebSockets and fallback transports. It is useful for notifications, dashboards, collaborative features, chat, live status updates, and workflow monitoring.

Multi-Tenancy Patterns in ASP.NET Core

2 minute read

Published:

This post covers common multi-tenancy patterns in ASP.NET Core. Multi-tenancy means one application serves multiple customers, organizations, or logical tenants while keeping their data and configuration separated. The hard parts are tenant identification, data isolation, configuration, security, and operations.

Deploying ASP.NET Core Apps: Docker, Linux Hosting, Nginx, and Health Checks

2 minute read

Published:

This post covers practical deployment patterns for ASP.NET Core apps: Docker images, Linux hosting, reverse proxies such as Nginx, and health checks. Deployment is part of application design. An app that cannot start, stop, report health, and receive traffic cleanly is not production-ready.

gRPC in .NET: Contracts, Streaming, and Interop

2 minute read

Published:

This post introduces gRPC in .NET: contract-first service definitions, generated clients, streaming calls, and interop considerations. REST and JSON are still excellent for many APIs, but gRPC is useful when strongly typed contracts and efficient service-to-service communication matter.

Security Deep Dive for .NET APIs: OWASP, Rate Limiting, Headers, and CORS

2 minute read

Published:

This post covers practical security controls for ASP.NET Core APIs: OWASP API risks, rate limiting, security headers, CORS, authentication, authorization, and input handling. Security is not one feature. It is a set of controls that reduce the chance and impact of abuse.

Performance Tuning in .NET: Kestrel, GC, Allocations, and BenchmarkDotNet

3 minute read

Published:

This post covers practical performance tuning in .NET: Kestrel configuration, garbage collection, allocation reduction, and benchmarking with BenchmarkDotNet. Performance work should start with measurement. Guessing usually leads to busy code that is not actually faster.

Observability in .NET: OpenTelemetry Traces, Metrics, and Logs

2 minute read

Published:

This post covers observability in .NET using traces, metrics, logs, and OpenTelemetry. Logging tells you what happened. Observability helps you understand how a system behaves across services, dependencies, and time.

Outbox Pattern in .NET: Reliable Messaging and Eventual Consistency

3 minute read

Published:

This post covers the outbox pattern, one of the most important patterns for reliable messaging. The problem is simple: your application needs to save data and publish a message, but the database and message broker do not share one transaction. The outbox pattern solves this by storing messages in the database first and publishing them later.

Messaging and Event-Driven Design in .NET: MassTransit, RabbitMQ, and Kafka Basics

2 minute read

Published:

This post covers the basics of messaging and event-driven design in .NET. When systems grow, not every operation should be a direct HTTP call. Messaging lets services communicate through commands, events, queues, topics, and streams so work can happen asynchronously and systems can be less tightly coupled.

Domain Modeling in .NET: Aggregates, Value Objects, and Invariants

3 minute read

Published:

This post covers practical domain modeling in .NET using aggregates, value objects, and invariants. The goal is not to turn every app into a textbook DDD system. The goal is to put important business rules in places where they are hard to bypass.

Clean Architecture vs Vertical Slice in .NET: Pragmatic Guidance

3 minute read

Published:

This post compares two popular ways to structure .NET applications: Clean Architecture and Vertical Slice Architecture. Both can produce maintainable systems, and both can become over-engineered if applied mechanically. The useful question is not “which one is best?” The useful question is “which structure reduces change friction for this codebase?”

Resilience in .NET: HttpClientFactory, Polly Policies, Retries, and Timeouts

3 minute read

Published:

This post covers how .NET applications should call external services safely using HttpClientFactory, timeouts, retries, and resilience policies. Distributed systems fail in ordinary ways: networks pause, DNS changes, services restart, and dependencies return temporary errors. Resilience design assumes those failures will happen.

API Documentation in .NET: OpenAPI, Swagger, Examples, and Versioning

3 minute read

Published:

This post covers how to document ASP.NET Core APIs using OpenAPI, Swagger UI, examples, and version-aware contracts. Good API documentation is not decoration. It is how frontend developers, mobile teams, integration partners, and future maintainers understand what your API promises.

Caching in .NET: IMemoryCache, Distributed Cache with Redis, and Response Caching

3 minute read

Published:

This post covers the main caching options in .NET applications: in-memory cache, distributed cache, Redis, and HTTP response caching. Caching can reduce latency and database load, but it also introduces correctness questions. The hard part is not storing data. The hard part is knowing when cached data is valid.

Background Jobs in .NET: HostedService, BackgroundService, and Worker Services

3 minute read

Published:

This post covers the background processing options built into modern .NET applications. Web APIs handle request/response work, but real systems also need jobs that run outside a single HTTP request: queue consumers, scheduled cleanup, report generation, synchronization, and long-running workers.

Testing ASP.NET Core Apps: xUnit and Integration Tests with WebApplicationFactory

4 minute read

Published:

This post covers the two testing layers most .NET teams rely on heavily: unit tests with xUnit and integration tests with WebApplicationFactory. Unit tests give you fast feedback on isolated logic. Integration tests prove that your application actually boots, routes requests, resolves dependencies, and returns the expected HTTP responses.

EF Core Performance: AsNoTracking, Compiled Queries, and Split Queries

5 minute read

Published:

This post covers some of the most useful EF Core performance techniques you will apply in read-heavy applications: disable tracking for read-only queries, project only the data you need, use compiled queries for hot paths, and understand when split queries help avoid large join explosions. Performance work starts with measurement, but these patterns are worth knowing early.

EF Core Fundamentals: DbContext, Migrations, Tracking, and Relationships

4 minute read

Published:

This post covers the pieces of Entity Framework Core you need before building real data-backed applications. The essential model is: your entities represent data, DbContext coordinates access to that data, migrations evolve the schema, and change tracking decides what EF Core will insert, update, or delete.

Authorization in ASP.NET Core: Policies, Roles, Claims, and Resource-Based Access

3 minute read

Published:

This post covers the part of security that decides what an authenticated user is allowed to do. In ASP.NET Core, authorization usually builds on roles, claims, named policies, and sometimes resource-specific checks performed in code. If authentication answers “who are you?”, authorization answers “may you do this?”.

Authentication Basics for .NET APIs: Cookies vs JWT vs OAuth2/OIDC

4 minute read

Published:

This post gives an overview of the most common authentication approaches you will see in .NET applications: cookies, JWT bearer tokens, and OAuth2/OIDC-based sign-in flows. The important thing is not memorizing every protocol detail. The important thing is understanding what each approach is for and when it fits.

Error Handling in ASP.NET Core: Middleware, Exception Filters, and ProblemDetails

5 minute read

Published:

This post covers how to handle failures in an ASP.NET Core API without leaking stack traces or returning random error shapes. The goal is not to prevent every exception. The goal is to catch failures at the right level, log them, and return a consistent response contract such as ProblemDetails.

Model Binding and Validation in ASP.NET Core: DataAnnotations and FluentValidation Basics

5 minute read

Published:

This post covers two important jobs the framework performs for you: model binding and validation. Model binding turns incoming HTTP data into .NET values. Validation checks whether those values satisfy your rules. If you understand where each responsibility begins and ends, your endpoints become much easier to reason about.

Building Your First Web API in .NET 8: Controllers, Minimal APIs, and Routing

5 minute read

Published:

This post shows how to build your first ASP.NET Core Web API and, more importantly, how to think about the choices you make along the way. The two main styles are controllers and minimal APIs, and both rely on the same routing system underneath. Once you understand those pieces, building new endpoints stops feeling mysterious.

Logging and Diagnostics in .NET 8: ILogger, Structured Logging, and Log Levels

6 minute read

Published:

This post covers the logging and diagnostics features you should understand before running a .NET application in any real environment. The short version is: use ILogger everywhere, log structured data instead of string-concatenated messages, and configure log levels deliberately so production logs remain useful instead of noisy.

C# Essentials for .NET Developers: Types, LINQ, and Async/Await

7 minute read

Published:

This post covers the C# features every .NET developer uses daily. You do not need to master every corner of the language on day one, but you do need a solid grip on how types behave, how LINQ transforms data, and how async/await keeps your application responsive. These three areas show up in almost every code review, bug report, and production service.

Project Structure in .NET 8: Solutions, .csproj, NuGet, and Build Outputs

6 minute read

Published:

This post covers how a typical .NET codebase is organized. New developers often focus on Program.cs and controllers, but production projects are shaped just as much by how solutions are split, how project files are configured, how packages are restored, and where compiled artifacts are written. If you understand those four pieces, you can navigate almost any .NET repository with less guesswork.

.NET 8 Web API Fundamentals: Routing, Models, Validation, and the Request Pipeline

7 minute read

Published:

This post covers the fundamentals of building a Web API with .NET 8 (ASP.NET Core). If you’re new to the ecosystem, your goal isn’t to memorize every feature—it’s to understand the core mechanics: how requests flow through your app, how endpoints are defined, how data is validated, and how responses are shaped. Once these pieces click, everything else becomes “just configuration”.

portfolio

AI Articles

Published:

In this section, I share technical deep dives on Artificial Intelligence systems, covering model integration, production deployment patterns, performance considerations, and architectural trade-offs. The articles explore how AI capabilities are engineered into scalable, distributed systems, focusing on real-world implementation rather than theory. Explore the posts by clicking on AI Articles above.

Clouds Articles

Published:

This section documents architectural patterns and engineering practices across modern cloud ecosystems. Topics include distributed system design, scalability strategies, resilience patterns, and cloud-native implementation models. The articles emphasize real-world trade-offs and production considerations for building robust, enterprise-grade platforms. Explore the posts on clicking on Clouds Articles above.

publications

Paper Title Number 4

Published in GitHub Journal of Bugs, 2024

This paper is about fixing template issue #693.

Recommended citation: Your Name, You. (2024). "Paper Title Number 3." GitHub Journal of Bugs. 1(3).
Download Paper

talks

teaching

Teaching experience 1

Undergraduate course, University 1, Department, 2014

This is a description of a teaching experience. You can use markdown like any other post.

Teaching experience 2

Workshop, University 1, Department, 2015

This is a description of a teaching experience. You can use markdown like any other post.