Dev.to·Tuesday, December 23, 2025

Dev.to - Tuesday, December 23, 2025

10 stories~15 min

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Stories Covered

Beyond CRUD: Designing a Multi-Tenant Data Isolation Architecture in Java

PharmVault System Architecture PharmVault is a centralised digital vault designed for managing sensitive personal notes and confidential data. Unlike standard CRUD applications, this system was architected with a security-first mindset. It operates on a Zero-Trust principle, assuming that the network layer may be compromised. Consequently, the application enforces strict data isolation per user, encrypts all content at rest, and allows access only via authenticated, stateless protocols. *Technic

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C# Architecture Mastery — Clean Architecture in ASP.NET Core: Minimal APIs vs MVC (Part 4)

Clean Architecture is framework-agnostic. ASP.NET Core is framework-heavy. So the real question is not “Which framework should I use?” but: How do I apply Clean Architecture without letting the framework leak inward? In this Part 4, we’ll compare Minimal APIs vs MVC through the lens of Clean Architecture, not personal preference. Frameworks are details. ASP.NET Core is an outer-layer concern. If your domain or application layer knows about: Controllers HTTP attributes Model binders IActionResult

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C# Architecture Mastery — Dependency Injection, Lifetimes & Composition Roots (Part 3)

Most developers use Dependency Injection. Few truly understand its architectural role. In this Part 3, we go beyond syntax and focus on why DI exists, how lifetimes affect correctness, and why the composition root is one of the most important (and misunderstood) concepts in modern .NET systems. Dependencies → Lifetimes → System Assembly This is where architecture becomes real. Dependency Injection (DI) solves one problem: Removing hard dependencies between high-level policies and low-level detai

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Building Custom Voice Profiles in VAPI for E-commerce: A Developer's Journey

Building Custom Voice Profiles in VAPI for E-commerce: A Developer's Journey TL;DR Most e-commerce voice agents sound robotic because they use default voices. Custom voice profiles in VAPI let you match brand personality, reduce customer friction, and increase conversion rates. You'll configure voice synthesis with provider-specific parameters, handle real-time voice switching mid-call, and integrate Twilio for PSTN delivery. Result: voice AI that feels human, not generic. API Keys

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Building an IDE in Flutter, for Flutter

I'm trying to build an IDE specifically for Flutter, this is similar to VSCode, but with some Flutter specific features. The catch? I'm using Flutter to build the IDE itself! So now, you can compile your Flutter projects, inside a Flutter app. There are 2 specific features that I've worked on till now: A seperate folder structure for Flutter projects. This might look similar to you if you've used Android Studio. A dedicated tab to search for pub.dev packages and directly add them to your appli

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C# Architecture Mastery — From OOP to SOLID to Clean Architecture (Part 2)

Most developers learn OOP syntax early. Few learn how OOP decisions scale into architecture. In this Part 2, we move deliberately: Objects → Principles → Architecture This is the path senior .NET engineers follow—whether they name it or not. OOP gives us: Encapsulation Abstraction Inheritance Polymorphism But OOP alone does not guarantee good design. Bad OOP still exists: God classes Tight coupling Inheritance abuse Anemic domain models OOP is the toolset—not the blueprint. SOLID exists because

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Ship Faster: The Complete Asset Optimization Reference

The Complete Guide to Web Asset Optimization A comprehensive reference for loading, optimizing, and delivering every type of web asset. The ultimate guide for system design interviews and production applications. Critical Rendering Path Scripts Stylesheets Fonts Images Videos Resource Hints Third-Party Scripts & Analytics Caching Strategies Compression HTTP/2 & HTTP/3 Core Web Vitals Impact Priority Hints Service Workers & Offline CDN & Edge Optimization Loading Order Cheatsheet The browser mu

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AI Made Me More Productive — and Less Sure Why I Code

It's been a while since my last post. One thing that has been occupying my mind lately is AI. I think this post won't have much structure — just some ramblings about AI. In 2017 — almost ten years ago, how time flies — I did some further education in AI. At that time, deep learning was the big thing. Hardware advances allowed for deep neural networks with multiple hidden layers, the way it had been imagined since the 50s and 60s, starting with the perceptron. I was fascinated — by the possibili

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C# Fundamentals Mastery — From Quiz Answers to Production-Grade .NET Mental Models

Most C# exams and bootcamp quizzes don’t ask you to design a full system. Instead, they quietly test whether you understand the mental models behind the language: What really is an algorithm? Why does long occupy 8 bytes? When should you use for vs foreach? What problem does OOP actually solve? Why does var not make C# dynamically typed? In this article, we’ll take real quiz-style questions and turn them into production-ready reasoning patterns you can reuse in: Technical interviews Code reviews

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