You will get .NET Bug Fix Consultation | Full Stack Developer | C# .NET
Top Rated
Project details
Your .NET application is slow, crashing, or behaving unpredictably — and your team cannot pinpoint why. A senior perspective often finds in one hour what takes days alone.
I am a .NET Developer and Full Stack Developer who has diagnosed production issues across FinTech, HealthTech, SaaS, and EdTech — C# .NET Core bugs, EF Core problems, ASP.NET timeouts, SQL slow queries, and memory leaks.
In this consultation we cover:
Bug diagnosis: reproduce the issue, read the stack trace, and identify root cause — not just symptoms.
Performance bottlenecks: N+1 queries, missing indexes, blocking async calls, memory pressure, payload size.
.NET Core Developer issues: middleware, DI lifetime mismatches, C# async/await bugs, EF Core queries.
Full Stack Developer issues: API mismatches, CORS errors, auth token expiry, and caching gaps.
Fix roadmap: what to fix, in what order, and what to monitor after to confirm it worked.
Done = root cause identified, fix approach agreed, written diagnosis notes within 24 hours.
Senior .NET Developer · C# Developer · .NET Core Developer · Full Stack Developer · ASP.NET.
What is breaking — and when did it start?
I am a .NET Developer and Full Stack Developer who has diagnosed production issues across FinTech, HealthTech, SaaS, and EdTech — C# .NET Core bugs, EF Core problems, ASP.NET timeouts, SQL slow queries, and memory leaks.
In this consultation we cover:
Bug diagnosis: reproduce the issue, read the stack trace, and identify root cause — not just symptoms.
Performance bottlenecks: N+1 queries, missing indexes, blocking async calls, memory pressure, payload size.
.NET Core Developer issues: middleware, DI lifetime mismatches, C# async/await bugs, EF Core queries.
Full Stack Developer issues: API mismatches, CORS errors, auth token expiry, and caching gaps.
Fix roadmap: what to fix, in what order, and what to monitor after to confirm it worked.
Done = root cause identified, fix approach agreed, written diagnosis notes within 24 hours.
Senior .NET Developer · C# Developer · .NET Core Developer · Full Stack Developer · ASP.NET.
What is breaking — and when did it start?
Programming Languages
Python, ASP.NET, C#Coding Expertise
Cross Browser & Device Compatibility, Localization, Performance OptimizationWhat's included
| Service Tiers |
Starter
$49
|
Standard
$99
|
Advanced
$149
|
|---|---|---|---|
| Delivery Time | 2 days | 3 days | 5 days |
Number of Revisions | 0 | 0 | 1 |
Design Customization | - | - | - |
Content Upload | - | - | - |
Responsive Design | - | - | - |
Source Code | - | - | - |
Frequently asked questions
13 reviews
(11)
(2)
(0)
(0)
(0)
This project doesn't have any reviews.
DG
Dmitry G.
Jul 9, 2026
.NET Developer / Full Stack Developer Needed for Auth Session Issues
Quickly grasped a complex problem, proposed a solid technical solution, and delivered results without unnecessary delays or back-and-forth.
OS
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
About Daria
Full Stack Developer | .NET Developer | C# Developer Angular Blazor
100%
Job Success
Zaporozhye, Ukraine - 3:34 pm local time
8+ years as a Full Stack Developer and .NET Developer, 60+ web apps shipped for US, UK and EU clients $60k+ earned on Upwork as a C# Developer and .NET Developer, 100% Job Success Score
As a Full Stack Developer, I've shipped 40+ releases combining React, Angular and ASP.NET Core
As a C# Developer, I cut API response times by 45% and infrastructure costs by 30% for a fintech client As a .NET Developer, I migrated 3 legacy monoliths to .NET Core microservices, +70% deployment speed
💥 Recent win — as a Full Stack Developer and C# Developer, I rebuilt a logistics platform using .NET Core, Angular and MySQL, cutting order processing time by 55% and lifting client retention by 22%.
🟢 Most business platforms are slow, hard to scale and expensive to maintain. With 8+ years as a .NET Developer, C# Developer and Full Stack Developer, I architect scalable web developer solutions on .NET, Angular, React and Python stacks that turn technical debt into growth 🟢
⭐️⭐️⭐️⭐️⭐️ "She's an outstanding .NET Developer and Full Stack Developer. Reliable, communicative, and delivers clean, production-ready C# code every time."
🎯 WHY CLIENTS CHOOSE ME AS A FULL STACK DEVELOPER
I'm a Full Stack Developer, .NET Developer and C# Developer with full-cycle ownership — from database architecture and API design to pixel-perfect frontends. As a C# Developer, I write clean, testable code following SOLID principles, and as a Full Stack Developer I make sure the entire product actually works for your users.
✔️ .NET Core & C# — as a .NET Developer and C# Developer: scalable ASP.NET Core APIs, background services, .NET MAUI apps
✔️ Frontend — React, Angular, Vue.js, jQuery, built for speed and clean UX
✔️ Full Stack Development — as a Full Stack Developer, connecting .NET, Node.js and Python backends to JavaScript frontends
✔️ Web Developer Services — as a web developer, WordPress, Laravel and PHP sites alongside custom .NET apps
✔️ Database Architecture — MySQL, SQL Server, API Integration for data-heavy systems
✔️ Cloud & DevOps — Azure, AWS, Docker, CI/CD, supporting .net full stack developer and full stack developer react deployments
📊 RESULTS
🔶 Fintech Platform: as a .NET Developer and C# Developer, -60% transaction errors, 99.9% uptime via a full .NET Core rebuild
🔶 E-commerce Marketplace: as a Full Stack Developer, React + .NET Core APIs, +28% checkout conversion, 3x page load speed
🔶 Healthcare SaaS: as a senior .net developer, HIPAA-compliant rebuild, -40% manual admin work
⚙️ TECH STACK
C#, .NET, .NET Core, .NET Framework, .NET MAUI, ASP.NET, React, Angular, Vue.js, Node.js, JavaScript, TypeScript, Python, PHP, Laravel, WordPress, HTML5, CSS 3, jQuery, Bootstrap, MySQL, SQL Server, Git, Azure, AWS, Docker, Software Architecture & Design, Agile Software Development, Desktop Application development
💼 EVERY PROJECT AS A FULL STACK DEVELOPER INCLUDES
▪️ Clean, well-documented C# and .NET code with automated testing
▪️ Direct communication, just a senior C# Developer / .NET Developer working on your project
▪️ Ongoing support after launch as your long-term Full Stack Developer and .NET Developer partner
🏭 INDUSTRIES
Fintech · Healthcare · E-commerce · Logistics · SaaS · Real Estate · EdTech
🔎 ALSO EXPERIENCED AS
react developer · python developer · java developer · blockchain developer · mobile app developer · wordpress developer · full-stack web developer · python full stack developer · wordpress full stack · full stack developer react · c# .net developer · senior fullstack developer · .net full stack developer · senior .net developer · .net core developer · c developer · cs cart developer · qnap integration · c# wpf · c# angular · c# unity · javascript fullstack · fullstack web developer · full stake developer · c# game developer · full-stack development
Each project covers a real client engagement, twice over: react developer dashboard + rebuild; python developer API + script; java developer module + fix; blockchain developer audit + integration; mobile app developer release + update; wordpress developer site + migration; full-stack web developer scope; python full stack developer work; wordpress full stack rebuild; full stack developer react integration; c# .net developer contract; senior fullstack developer judgment; .net full stack developer discipline; senior .net developer oversight; .net core developer debugging; c developer fixes; cs cart developer migrations; qnap integration fixes; c# wpf builds; c# angular dashboards; c# unity prototypes; javascript fullstack proofs of concept; fullstack web developer delivery; full stake developer projects; c# game developer credits; full-stack development results.
🚀 LOOKING FOR A RELIABLE FULL STACK DEVELOPER OR .NET DEVELOPER?
👉 Hire a proven .NET Developer, C# Developer and Full Stack Developer.
📅 Last updated: 10.07.2026
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.
You share logs and context
I review your issue description, error messages, and stack details before the call so we can start diagnosing immediately.
Bug diagnosis and performance consultation
We go through the issue — stack trace, query plans, memory usage, configuration. I identify root cause and fix approach.