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Migrated a 100k-row legacy system with zero downtime. Here's what actually worked.
A client's ASP.NET WebForms app was crawling — pages taking 8+ seconds to load under real production data.
The problem wasn't the framework. It was unindexed queries and client-side pagination trying to handle six-figure row counts.
What I did:
Migrated the backend to .NET 8 Core in phases, not a big-bang rewrite
Rebuilt pagination server-side with proper SQL indexing and query profiling
Kept the app live for users the entire time — zero downtime
Result: load times dropped from 8s to under 1s, and the client's support tickets for "slow dashboard" complaints disappeared entirely.
The lesson? Full-stack developer work isn't just writing React components — it's knowing when the real fix lives in the database layer.
If you're dealing with a legacy .NET system that's aging badly, or a React frontend that feels fast until real data hits it, I'd love to compare notes.
What's the oldest legacy stack you've had to modernize — and what broke first?
More on how I approach these migrations is on my profile 👇
asp.net
ASP.NET Core | Open-source web framework for .NET
Build web apps and services that run on Windows, Linux, and macOS using C#, HTML, CSS, and JavaScript. Get started for free on Windows, Linux, or macOS.
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I’m Talha, a Full-Stack Engineer specializing in Three.js, WebGL, React Three Fiber, and high-performance Web Development.
I build browser-native 3D product configurators, interactive BIM/IFC viewers, and custom WebGL applications that bring desktop-grade spatial experiences straight into the web browser.
As I’m new to Contra, I’d love to learn from experienced freelancers here: What strategies or workflows worked best for landing your very first client on Contra?
Any quick tips on proposal outreach, portfolio structuring, or client discovery on the platform would be super helpful!
Looking forward to connecting with fellow builders and clients here! 🚀
Strong showcase; combining Three.js, WebGL, and full-stack expertise makes the work feel both technically impressive and visually polished.
Offline-First Healthcare PWA (Clinic Management)
Developed a multi-tenant Progressive Web App (PWA) handling 100+ daily patients.
Key Features:
Engineered an offline-first architecture using IndexedDB for uninterrupted token generation without internet.
Background synchronization via Supabase when connectivity is restored.
Built a real-time TV display syncing architecture with Next.js.
IndexedDB for offline token generation + background sync to Supabase once connectivity returns is exactly the right call for a clinic that can't afford downtime. The conflict-resolution side of that sync is usually the hard part — how are you handling it if two devices generate...
not every saas landing page needs gradients, dashboards and floating cards.
