Juan David Roa Valencia, MSc

Entity Framework Core is a popular ORM for .NET apps. It lets you work with databases using .NET objects. In this course, Beau teaches you how to use it with MongoDB. You'll learn the basics and solidify your skills by building a restaurant app. https://lnkd.in/gftWmXX3

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🚀 Angular Signal Forms – Nested Validation Made Easy  Angular’s new Signal Forms make validation type-safe, composable, and reactive.   Instead of spreading Validators.required everywhere, you can build modular schemas.  Example:   - ✅ Reusable tagSchema   - ✅ Composable contactSchema   - ✅ Nested userSchema  const tagSchema = schema<ContactTag>((f) => {  required(f, { message: 'Tag is required' });  minLength(f, 2, { message: 'Tag must be at least 2 characters' }); }); const contactSchema = schema<Contact>((f) => {  required(f.type, { message: 'Contact type is required' });  required(f.value, { message: 'Contact value is required' });  applyEach(f.tags, tagSchema); }); const userSchema = schema<User>((f) => {  required(f.name, { message: 'Name is required' });  emailValidator(f.email, { message: 'Invalid email' });  required(f.address.street, { message: 'Street is required' });  applyEach(f.address.contacts, contactSchema); }); userForm = form(this.user, userSchema); ✨ Benefits:   - Composable & modular   - Type-safe with models   - Reactive with Angular Signals   - Scales to nested & complex forms  🔥 Exploring Angular Signals Forms features?    👉 Follow Sonu Sindhu for more Angular Signal tips & deep dives!  #Angular #Signals #Angular18 #WebDevelopment #Frontend

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🚀 Spring Boot Annotations Cheat Sheet – With Real-World Examples! If you're working with Spring Boot, understanding its powerful annotations can supercharge your development and improve code readability. I’ve put together a visual one-sheet covering: ✅ Core annotations for configuration & bootstrapping ✅ Dependency Injection (@Autowired, @Qualifier) ✅ MVC & REST (@RestController, @RequestMapping, etc.) ✅ JPA, Transaction Management ✅ Async, Caching, Testing & more Perfect for: 🔹 Interview preparation 🔹 Writing clean, enterprise-level code 🔹 Getting up to speed on new Spring Boot projects Whether you're a beginner or a seasoned developer, this quick reference will help you recall and apply annotations effectively. #SpringBoot #Java #Microservices

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🔥 Angular Dev Tip: Send the Last Beacon! Just like Pippin lighting the beacon to save Gondor, your Angular app can send a final signal before the user leaves 🏰✨ Thanks to navigator.sendBeacon, you can make sure that last API call—logging actions, analytics, or “farewell” messages—actually reaches your server, even if the user closes their browser. 💡 Bonus: The Beacon API is now available as Baseline in almost every browser, so you can rely on it widely not only in Angular! So go ahead, light your beacon and save the day! ⚡ #Angular #WebDevelopment #FrontendMagic #JavaScript #Beacons

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How to Avoid Common EF Core Performance Pitfalls. Entity Framework Core is one of the most popular ORMs in the .NET ecosystem, for good reason. It abstracts away the complexity of working with databases, allowing developers to focus on business logic rather than SQL queries. But here's the catch: The abstraction is only helpful until it gets in your way. Understanding how EF Core works under the hood becomes essential when things go wrong, like performance issues. This Friday in the .NET Pulse newsletter, we'll examine common EF Core performance pitfalls, why they happen, and, most importantly, how to avoid them. Don't miss it and subscribe now! Subscribe: https://lnkd.in/eZgHCEiR

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🧵 Want to learn .NET in 2025? Here’s a robust, practical roadmap for absolute beginners I often get this question in DMs: “Where should I start if I want to learn .NET today?” Here’s a more complete and proven path — filled with trusted global resources👇 🔹 Step 1 – Master C# basics • 📘 Microsoft Learn – C# for beginners • 🎥 Brackeys-inspired YouTube tutorial – C# Fundamentals Start with variables, conditionals, loops, functions. The goal? Write clear logic without stress. 🔹 Step 2 – Understand the .NET ecosystem • 📘 .NET Fundamentals – framework vs runtime • 🧠 Read: “Why Microsoft switched from .NET Framework to .NET Core” – many blog posts explain the vision 🔹 Step 3 – Build your first Web API with ASP.NET Core • 📘 Microsoft tutorial – Build your first ASP.NET Core Web API • 🎥 YouTube – “ASP.NET Core Web API Crash Course” (Tech With Tim) Try creating endpoints, model binding, validation, and swagger documentation. 🔹 Step 4 – Connect with EF Core • 📘 EF Core documentation • 📚 Udemy – EF Core by Mosh Hamedani (Clean Code Academy) • 📘 Read: “Best Practices for EF Core Performance” Understand Migrations, DbContext, relationships, and performance gotchas. 🔹 Step 5 – Explore software architecture Focus on these: ApproachWhen to use itLayered/N‑TierGreat for small apps, easy to followClean ArchitectureIdeal when you want a maintainable and testable domain layerModular MonolithUseful when you want structure without microservice complexity • 📘 .NET Architecture guide • 📘 Clean Architecture repository by Jason Taylor • 📘 Modular Monolith by Jimmy Bogard (blog) 🔹 Step 6 – Start system design basics • 📘 System Design Primer – GitHub • 🎥 ByteByteGo YouTube channel • 📗 Designing Data-Intensive Applications by Martin Kleppmann Map out diagrams, understand message queues, caching, consistency, and real-world trade-offs. 🔐 Pro Tip – Containerize your app Create your own Docker containers for the projects above. It’s essential for modern development: – Learn containerized workflows – Build deployment confidence – Prepare yourself for CI/CD pipelines • 📘 Docker’s official getting started guide • 🎥 YouTube – Docker for Beginners (Academind) ✅ Final thoughts • Learn step by step, no rush • Build small real projects and deploy them • Share your progress — engage on forums and LinkedIn • Ask questions and persist — learning takes time Save this post as your learning map, and follow me for more .NET insights, architecture deep dives, and system design breakdowns. Let’s grow together! 🚀 #dotnet #csharp #softwarearchitecture #dotnetcore #aspnetcore #EFCore #systemdesign #docker #selftaught #backenddev

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❄️ Frozen Collections in C# 12: Ultra-Fast Lookups Are Here C# 12 / .NET 8 introduced FrozenSet<T> & FrozenDictionary<TKey,TValue> and they're game changers for read-heavy scenarios. ⚡ Why They Matter Significantly faster lookups (up to 30% performance boost) Immutable by design - no accidental modifications Thread-safe for reads - perfect for concurrent scenarios Optimized memory layout for blazing-fast reads 🔧 Quick Example using System.Collections.Frozen; // Fast lookup tables var validCountries = new[] { "US", "CA", "UK" }.ToFrozenSet(); var statusCodes = new Dictionary<int, string> { [200] = "OK", [404] = "Not Found" }.ToFrozenDictionary(); // Lightning-fast queries bool isValid = validCountries.Contains("US"); // ⚡ 🌐 Real-World Impact At a fintech API serving 10K+ requests/minute, switching permission validation from HashSet<string> to FrozenSet<string> reduced response time by 20%. The lookup table for user roles was loaded once at startup and queried millions of times - perfect frozen collection scenario! 🚀 The Bottom Line If your app does lots of lookups on static data, Frozen Collections can dramatically boost performance with minimal code changes. Question: Have you tried FrozenSet in your projects yet? What's your biggest lookup bottleneck? #DotNet #CSharp #Performance #DotNet8 #Programming

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