You will get .NET Developer + Full Stack Developer for Legacy Migration
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Project details
Your .NET Framework app still runs — but it's getting harder to deploy and extend, and the team is afraid to touch it.
I'm a .NET Developer and Full Stack Developer specialising in legacy .NET migrations: Framework 4.x → .NET 6/8, monolith → microservices, NHibernate → Entity Framework. No big-bang rewrites, no extended downtime.
What I deliver:
Migration audit: map dependencies, identify risk zones, estimate effort per module
Incremental plan: phased delivery so your system stays in production throughout
.NET Framework → .NET 6/8 upgrade with full test coverage
Monolith decomposition into services where it makes sense — not as a default
Frontend alignment: Angular or React UI updated to match new backend contracts
Handoff: architecture docs, CI/CD pipeline, and deployment runbook
Done = your app runs on .NET 6/8 in staging, CI/CD passes, and your team has a clear map of what changed.
Past results: modernised a 20+ year banking platform across 15+ SaaS products — .NET 4.6 → .NET 6, stabilised in under 3 months; zero downtime migration for a UK affiliate platform at scale.
Still on Framework, or already partially migrated?
I'm a .NET Developer and Full Stack Developer specialising in legacy .NET migrations: Framework 4.x → .NET 6/8, monolith → microservices, NHibernate → Entity Framework. No big-bang rewrites, no extended downtime.
What I deliver:
Migration audit: map dependencies, identify risk zones, estimate effort per module
Incremental plan: phased delivery so your system stays in production throughout
.NET Framework → .NET 6/8 upgrade with full test coverage
Monolith decomposition into services where it makes sense — not as a default
Frontend alignment: Angular or React UI updated to match new backend contracts
Handoff: architecture docs, CI/CD pipeline, and deployment runbook
Done = your app runs on .NET 6/8 in staging, CI/CD passes, and your team has a clear map of what changed.
Past results: modernised a 20+ year banking platform across 15+ SaaS products — .NET 4.6 → .NET 6, stabilised in under 3 months; zero downtime migration for a UK affiliate platform at scale.
Still on Framework, or already partially migrated?
Web Programming Project
Blockchain Development, Browser Extension, API Development, API Integration, Data DashboardProgramming Languages
ASP.NET, Java, C#Coding Expertise
Cross Browser & Device Compatibility, Performance Optimization, SecurityWhat's included
| Service Tiers |
Starter
$500
|
Standard
$2,500
|
Advanced
$5,000
|
|---|---|---|---|
| Delivery Time | 5 days | 21 days | 30 days |
Number of Revisions | 1 | 2 | 5 |
Source Code |
Optional add-ons
You can add these on the next page.
Additional Revision
+$50
12 reviews
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Oleksandr S.
May 22, 2026
Full Stack Developer & .NET Developer help with API Integration issues
Really impressed with Daria's expertise. She spotted the root cause of our API issues within the first 30 minutes and explained everything clearly. Highly recommend for any .NET or Full Stack Developer consultation
OK
Olha K.
Feb 11, 2026
Full Stack .NET Developer Needed to Help With Payment Integration
Daria did a great job helping us fix our Stripe integration in a .NET app. She quickly found why webhooks weren’t updating the order status and guided us through a clean solution. Clear communication, fast turnaround, and very easy to work with. Would definitely hire again.
BL
Bartosz L.
Jun 2, 2023
.NET Developer needed to develop Blazor application (PART TIME)
Daria is great for her excellent work, communication, availability, and technical skills in .NET. Her coding proficiency, clear communication, prompt availability, and strong technical abilities have been instrumental in the success of your project. She is a valuable asset to your team.
SW
Stuart W.
Apr 3, 2021
.Net Full stack developer
Dari was easy to communicate with and an excellent and talented developer
SM
Stuart M.
Jul 6, 2020
Seeking Experienced Vue.js & Typescript Developer for Ongoing, Remote, Team-based work.
I have no hesitation in recommending Daria and her team.
Honest, hard working, skilful, communicative and keen.
The work done for me was exactly as I requested and they were able to solve problems along the way. It was a big bit of work (6+ months) and they fitted into my team well.
I would definitely use Daria again.
Honest, hard working, skilful, communicative and keen.
The work done for me was exactly as I requested and they were able to solve problems along the way. It was a big bit of work (6+ months) and they fitted into my team well.
I would definitely use Daria again.
About Daria
.NET Developer | Full Stack Developer | C# Development | Angular Blazo
100%
Job Success
Zaporozhye, Ukraine - 5:49 pm local time
As a Full Stack Developer, .NET Full Stack Developer, and experienced Web Developer, I help companies build scalable SaaS platforms, CRM systems, and enterprise-grade solutions. Over the past 10+ years, I’ve worked as a React Developer, WordPress Developer, and Mobile App Developer, delivering production-ready systems across fintech, e-commerce, healthcare, and AI-driven platforms.
During my career as a Full Stack Developer and .NET Developer, I’ve built and scaled 10+ complex web platforms. I’ve also worked as a Python Full Stack Developer on data-heavy projects and as a Full Stack Developer AI, integrating AI services into enterprise systems.
🔴 I’ve built Norwegian E-learning web application and online training software - a place where businesses, employees, and organizations of all sizes can come together to learn, grow, and succeed. As a Tech Lead, Full Stack Developer and .NET Developer I leveraged microservices architecture with Vue.js, ASP.NET, SQL, Azure App, and multiple APIs. The Vignita platform reached 2,500 companies and 100,000+ upskilled employees nationwide, introducing e-learning solutions in 10+ local university programs.
🟠 Affiliate B2B platform “Affaim” – built as a .NET Full Stack Developer and Python Full Stack Developer, integrating APIs, handling high-load databases, and delivering secure partner portals. My role as a Web Developer and Full Stack Developer Shopify included complex integrations and multi-tenant structures.
🟡 Global financial service “WorldRemit” – worked as a .NET Developer, .NET Full Stack Developer, and Full Stack Developer AI, migrating legacy systems to modern microservices and integrating global payment APIs.
🟢 AI-powered arbitrage platform “Sellerbility” – delivered as a Full Stack Developer AI, building automation logic and AI integrations. As a Full Stack Developer and React Developer, I implemented analytics dashboards and API-driven modules.
🔵 Multi-platform Telemedicine system – developed as a Mobile App Developer, Full Stack Developer, and Web Developer, using .NET Core, Xamarin, Vue.js, and secure API integrations. My experience as a Mobile App Developer includes cross-platform apps and enterprise-grade mobile systems.
As a professional Full Stack Developer, I prefer long-term cooperation and full-time engagement. However, I am also open to handling ad-hoc tasks or specific roles such as .NET Developer, Backend .NET Developer, Angular Developer, or Senior Web Developer. I also build .NET MAUI cross-platform apps that share a single C# codebase for iOS, Android, and desktop. In addition, I’ve worked as a WordPress Developer on custom business platforms and as a Full Stack Developer Shopify, building scalable e-commerce integrations. I also act as a Full Stack Developer React, focusing on dynamic dashboards and frontend performance optimization.
As a Full Stack Developer, I have used a wide range of technologies to design, build, and scale complex software systems for both startups and enterprises.
As a Full Stack Developer, I’ve worked with C#, .NET, .NET Core, ASP.NET, ASP.NET MVC, ASP.NET Web API, ASP.NET Web Forms, LINQ, Entity Framework, .NET Framework, WPF, WCF, OAuth, Auth0, Elasticsearch, and numerous API integrations including AI-driven services.
For frontend development, I’ve used Angular, jQuery, TypeScript, Vue.js, React.js, and Blazor to build interactive, responsive user interfaces fully integrated with .NET-based architectures.
Throughout my 10+ years in development, I’ve also worked with major databases like MsSQL (EF), MySQL, PostgreSQL, MongoDB, Redis, and Azure SQL Database, as well as cloud platforms such as Microsoft Azure, Azure Containers, Azure App Services, and Azure Data Factory.
In addition, I have strong experience in AI and automation, working with OpenAI API and Dify AI to create smart, data-driven software solutions.
As a Full Stack Developer, I also specialize in API development and integration: ChatGPT API, Stripe API, RevenueCat API, Crypto Payments API, Crypto Exchange API, PayPal API, Zendesk, Dify, IronPDF, Google Maps, SendGrid (both REST and RPC), RESTful, GraphQL, and gRPC.
I’ve also worked with mobile technologies such as Flutter, Dart, FlutterFlow, Supabase, Firebase Auth, Android, iOS, and general mobile app development.
My core expertise remains as a Full Stack Developer and .NET Developer, designing clean architectures (MVC, Microservices, Event-Driven), integrating AI tools as a Full Stack Developer AI, and delivering reliable cross-platform systems as a Mobile App Developer.
If you're searching for a Web Developer, React Developer, WordPress Developer, Python Full Stack Developer, Full Stack Developer Shopify, or .NET Full Stack Developer, I’m ready to collaborate
Steps for completing your project
After purchasing the project, send requirements so Daria can start the project.
Delivery time starts when Daria receives requirements from you.
Daria works on your project following the steps below.
Revisions may occur after the delivery date.
Codebase audit & dependency mapping
I review your solution structure, NuGet packages, ORM, and third-party dependencies — and deliver a risk map with effort estimate per module.