๐ป Expert 11+ years of commercial experience as Full Stack Developer
๐ป I have a reliable team that is helping me to fill any role that is needed on a project. Any level of expertise, any budget
Need a C# .NET Developer who owns delivery end to end? I've shipped 6 production platforms used by 120,000+ people, 98% of my milestones landed on or before the agreed date, and 12 of my 13 Upwork reviews are 5 stars.
I'm a .NET Full Stack Developer, so full-stack development means one person answers for the whole project instead of you managing five freelancers. My own hands stay on ASP.NET Core, ASP.NET MVC and C# .NET delivery, and I own the architecture decisions, not just a spec: 3+ years of event-driven microservices on MassTransit and RabbitMQ, 14 services, 1.2M+ messages a day, 99.95% uptime.
As a C# .NET Developer I've shipped 250+ RESTful API endpoints on ASP.NET Core, .NET Core, ASP.NET MVC, ASP.NET Web API, .NET Framework and Entity Framework, 35+ third-party API integration jobs for payment, carrier and CRM systems, and SignalR real-time features for 8,000+ concurrent users. I've worked as a C# Developer (C sharp) for 11+ years, and the data side comes with it: databases up to 600 GB and 900M rows on Microsoft SQL Server, PostgreSQL, CosmosDB and MongoDB, 1,200+ stored procedures, 40+ slow queries brought under 1s.
On an existing ASP.NET MVC web application I improved performance 30-80% through tuning, indexing and caching: the heaviest report page from 3.4s to 0.7s, API p95 from 900ms to 180ms, SQL Server CPU down 45%. I've found the root cause of 60+ production issues nobody could reproduce, and I've taken over 9 existing codebases as the incoming C# .NET Developer, the oldest a Classic ASP one from 2008.
I've spent 3+ years as a Full Stack Web Developer on the front end too: Full Stack Developer React and C# React work, Angular, jQuery, TypeScript, JavaScript, HTML, HTML5, CSS and Bootstrap, 4 SPAs delivered, 300+ UI components, responsive web design, Lighthouse above 90. A backend developer who hands off the UI creates a second integration problem, so as an ASP.NET Web Developer I own both sides, Node.js tooling included.
Cloud and DevOps come with the C# .NET Developer role, not as a separate hire: 3 years on Azure plus AWS, GCP, Docker, Kubernetes and 20+ Git based Azure DevOps CI/CD pipelines, release time from 4 hours to 25 minutes, Azure spend cut 30%. On security I run OAuth 2.0 and JWT, 5 Fortify pen-test cycles, every critical finding closed in 1 sprint, and 80%+ unit-test coverage on my last 3 projects.
PROJECTS from 11+ years of web development as a Full Stack Developer and C# .NET Developer
1. Business management platform, Full Stack Developer SaaS for 1,200+ businesses and franchise sites on ASP.NET MVC and ASP.NET Core, SignalR messaging to 8,000+ concurrent employees.
2. Commodity trading portal, Full Stack Developer fintech work as Technical Lead on ASP.NET Core and Angular with a 9-person team for 18 months, 600+ pull requests reviewed, 0 lost transactions.
3. Healthcare portal, Full Stack Developer healthcare work leading an 11-person team, performance up 30-80%, slowest queries from 18s to under 1s.
4. Enterprise feedback system, ASP.NET Core microservices built from scratch in 12 months for 25,000+ employees across 40 countries, on time and 8% under budget.
5. Warehouse logistics, Team Lead on ASP.NET MVC, ASP.NET Web API and React for 3 years, 400+ trucks tracked daily across 3 sites, 99.9% uptime.
6. Social network for car drivers, ASP.NET MVC for 45,000+ drivers and 1M+ real-time notifications a month.
Full Stack Developer marketplace, Full Stack Developer ecommerce and Full Stack Developer CRM builds are the same shape: catalogue, checkout, payments, carriers and back office.
I've been Top Rated on Upwork as a C# .NET Developer across 27 contracts with 5 long-term clients, the longest running 4 years, and I overlap 6+ hours with US and EU time. Certified MCSD and Microsoft Exam 486 (ASP.NET MVC).
ALSO EXPERIENCED AS
C# Developer on desktop application work: WPF, .NET MAUI and Blazor, 3 shipped apps, plus C and C++ software development early on; my core is ASP.NET Core on the web. For anything outside my stack I bring in the right person from my team, under my supervision: a Java developer and a Python developer for shared APIs, a designer for UI UX work, a second React developer when the front end is large, a Flutter and Ionic mobile app developer, a WordPress developer and a Laravel developer for PHP builds, a Sitefinity specialist for .NET CMS work, an Azure data engineer for pipelines, and a teammate who takes Full Stack Developer AI, Full Stack Developer LLM and Full Stack Developer Twilio integrations while I keep the C# .NET Developer side.
If you need a Full Stack Developer who owns the whole build, C# .NET backend, Angular or React front end, SQL Server and Azure, send me your scope. You get an answer within 1 business hour and an estimate in 24 hours.
Vadym K.
Full Stack .NET Developer | ASP.NET Core | SaaS Software Developer
Lviv, Ukraine
$35/hr$35 per hour5.0 (33) 56 jobs $1M+ total earnings
Hi, I see you're looking at my profile, so nice to meet you!๐ I'm a Full Stack .NET Developer with more than 8 years of experience. I work with a reliable team, so we can fill any role on your project and become long-term partners. I'll help you clarify requirements, spot risks early, and outline the fastest path to production!
With 8+ years in software development and 35+ delivered projects across fintech, healthtech, energy, industrial, maritime, defense, real estate, asset management, e-commerce, and SaaS, I build web applications, backend systems, RESTful APIs, desktop apps, and internal platforms that handle real production load. I own delivery end-to-end, from database design to deployment, release, and new features after launch.
๐ฃ๐ฅ๐ข๐ฉ๐๐ก ๐๐จ๐ฆ๐๐ก๐๐ฆ๐ฆ ๐๐ ๐ฃ๐๐๐ง
โ 35% faster order processing and near-zero packing errors on an e-commerce fulfillment platform with barcode scanning, inventory management, and multi-carrier shipping API integration
โ 70% less manual reporting after rebuilding a legacy asset management system for enterprise & defense clients (ASP.NET MVC, SQL, Entity Framework) with real-time tracking
โ 60โ80% faster query execution through Microsoft SQL Server & PostgreSQL optimization on reporting-heavy systems
โ Up to 50% shorter release cycles with a microservices architecture on Microsoft Azure and automated CI/CD pipelines
โ 10+ hours saved per week by a SaaS fleet & asset management system (.NET Core, Angular) with automated reporting
โ Hours of manual processing removed per case on a lending & compliance platform with CRM, pricing, and compliance API integrations
โ Centralized labor-cost tracking in a B2B SaaS suite (time tracking, project management, CRM) with approval workflows, analytics, and AI-assisted insights
๐๐จ๐๐-๐ฆ๐ง๐๐๐ & ๐ฆ๐๐๐ฆ ๐๐๐ฉ๐๐๐ข๐ฃ๐ ๐๐ก๐ง
Frontend: React, Angular, and Next.js interfaces, including real-time monitoring dashboards for industrial hardware that replaced delayed manual checks
Backend: ASP.NET Core Web API, microservices, Node.js, and Java services with clean, maintainable architecture
SaaS software development: multi-tenant B2B platforms, approval workflows, role-based access, analytics
AI integration: OpenAI / Azure OpenAI features like smart search, summarization, and workflow automation, added to existing .NET systems when they bring real value
๐๐๐๐๐๐ฌ ๐ ๐ข๐๐๐ฅ๐ก๐๐ญ๐๐ง๐๐ข๐ก
Undocumented code and daily production fires? I migrate .NET Framework and ASP.NET MVC systems to modern .NET Core, and I stabilize them with code review, sprint planning, better navigation, and responsive design across devices.
๐๐ข๐ ๐๐๐ก ๐ฆ๐ฃ๐๐๐๐๐๐ง๐๐๐ฆ
FinTech: lending, compliance, and CRM-integrated workflows
Asset & Fleet Management: tracking, reporting, sensitive operational data
E-commerce: fulfillment, inventory, shipping integrations
Industrial & Energy: real-time monitoring and data visualization
HealthTech, Real Estate, Defense, Enterprise Workplace Platforms
๐ง๐๐๐ ๐ฆ๐ง๐๐๐
โ Backend: .NET/C#, ASP.NET Core, ASP.NET MVC, ASP.NET Web API, .NET Framework, Java, Python, Node.js
โ Frontend: Angular, React, Next.js, TypeScript, JavaScript, HTML, SCSS
โ Database: Microsoft SQL Server, PostgreSQL, Entity Framework Core
โ Cloud & DevOps: Microsoft Azure, Azure SQL, Azure Key Vault, Docker, Microservices, CI/CD, Git
โ Other: RESTful APIs, API Integration, AI Integration, Agile, Clean Architecture, SOLID
โก ๐ช๐๐๐ง ๐ ๐๐๐ก ๐๐จ๐๐๐ ๐๐ข๐ฅ ๐ฌ๐ข๐จ
- Custom web application development and SaaS MVP development, from idea to launch
- CRM systems, internal business tools, admin panels, and dashboards
- RESTful API development and third-party API integration (CRM, shipping, compliance services)
- Windows desktop applications and .NET backend development
- Database design, SQL query optimization, and data migration
- Cloud migration to Microsoft Azure, Docker containerization, and CI/CD setup
- Code review, refactoring, bug fixing, and performance optimization of existing .NET applications
- Software architecture and technical consulting for startups and enterprise teams
๐ค ๐ช๐๐ฌ ๐๐๐๐๐ก๐ง๐ฆ ๐๐ข๐ ๐ ๐๐๐๐
I ask the right questions before writing the first line of code, flag problems early, and keep projects moving even when requirements shift. I also work with a reliable team, so we can cover any role on your project as long-term partners.
๐ฉ Whether you need a C# developer, ASP.NET Core developer, .NET backend developer, SaaS software developer, or full stack web developer for a long-term project, I'm ready to help. Feel free to invite me to an interview!
Vasyl K.
.NET Developer
Rudnyky, Ukraine
$25/hr$25 per hour5.0 (1) 2 jobs $5K+ total earnings
๐ฆ๐ฒ๐ป๐ถ๐ผ๐ฟ .๐ก๐๐ง ๐๐ฒ๐๐ฒ๐น๐ผ๐ฝ๐ฒ๐ฟ | ๐# | ๐๐ฆ๐ฃ.๐ก๐๐ง ๐๐ผ๐ฟ๐ฒ | ๐๐ฆ๐ฃ.๐ก๐๐ง ๐ ๐ฉ๐
I am a Senior .NET Developer specializing in C#, ASP.NET Core, ASP.NET MVC, ASP.NET Web API, .NET Framework, SQL, Microsoft SQL Server, React, Angular, JavaScript, and Node.js.
I build SaaS platforms, enterprise applications, business systems, REST APIs, Web APIs, backend systems, scalable web applications, database-driven applications, and enterprise software.
๐#
C# Developer, C# Development, C# Backend Development, C# Software Development, C# API Development, C# REST APIs, C# Enterprise Applications, C# Business Applications, C# Architecture, C# Database Integration.
๐๐ฆ๐ฃ.๐ก๐๐ง ๐๐ผ๐ฟ๐ฒ
ASP.NET Core Developer, ASP.NET Core Development, ASP.NET Core APIs, ASP.NET Core REST APIs, ASP.NET Core Backend Development, ASP.NET Core Web Applications, ASP.NET Core Microservices, ASP.NET Core SaaS Platforms, ASP.NET Core Enterprise Systems, ASP.NET Core Architecture.
๐๐ฆ๐ฃ.๐ก๐๐ง ๐ ๐ฉ๐
ASP.NET MVC Developer, ASP.NET MVC Development, ASP.NET MVC Applications, ASP.NET MVC Web Applications, ASP.NET MVC Backend Development, ASP.NET MVC Enterprise Development, ASP.NET MVC Business Systems, ASP.NET MVC Architecture, ASP.NET MVC Maintenance.
๐๐ฆ๐ฃ.๐ก๐๐ง ๐ช๐ฒ๐ฏ ๐๐ฃ๐
ASP.NET Web API Developer, ASP.NET Web API Development, ASP.NET Web API Services, ASP.NET Web API Integration, ASP.NET Web API Backend Systems, ASP.NET Web API Architecture, ASP.NET Web API Enterprise Systems, REST API Development, API Integration.
.๐ก๐๐ง ๐๐ฟ๐ฎ๐บ๐ฒ๐๐ผ๐ฟ๐ธ
.NET Framework Developer, .NET Framework Development, .NET Framework Applications, .NET Framework Maintenance, .NET Framework Modernization, .NET Framework Integration, .NET Framework APIs, .NET Framework Backend Development, .NET Framework Enterprise Systems.
๐ฆ๐ค๐ / ๐ ๐ถ๐ฐ๐ฟ๐ผ๐๐ผ๐ณ๐ ๐ฆ๐ค๐ ๐ฆ๐ฒ๐ฟ๐๐ฒ๐ฟ
SQL Developer, SQL Development, SQL Database Design, SQL Optimization, SQL Performance Tuning, SQL Queries, SQL Stored Procedures, SQL Data Modeling, SQL Reporting, SQL Integration, Microsoft SQL Server Development, Microsoft SQL Server Optimization, Microsoft SQL Server Architecture.
๐ฅ๐ฒ๐ฎ๐ฐ๐ / ๐๐ป๐ด๐๐น๐ฎ๐ฟ
React Developer, React Development, React Applications, React Frontend Development, React SPA Development, React Dashboard Development, React Enterprise Applications, Angular Developer, Angular Development, Angular Applications, Angular Frontend Development, Angular SPA Development, Angular Dashboard Development, Angular Enterprise Applications.
๐๐ฎ๐๐ฎ๐ฆ๐ฐ๐ฟ๐ถ๐ฝ๐ / ๐ก๐ผ๐ฑ๐ฒ.๐ท๐
JavaScript Developer, JavaScript Development, JavaScript Frontend Development, JavaScript Backend Development, JavaScript APIs, JavaScript Integration, Node.js Developer, Node.js Development, Node.js Backend Development, Node.js APIs, Node.js REST APIs, Node.js Services, Node.js Architecture.
๐ฆ๐ผ๐ณ๐๐๐ฎ๐ฟ๐ฒ ๐๐ฒ๐๐ถ๐ด๐ป
Software Design, Software Architecture, Software Design Patterns, Enterprise Software Design, SaaS Software Design, Backend Architecture, API Architecture, Scalable Systems, Business Applications.
Other skills: Desktop Application Development, Git, HTML, Bootstrap.
I can help with C# development, .NET development, ASP.NET Core development, ASP.NET MVC development, ASP.NET Web API development, SQL development, Microsoft SQL Server development, React development, Angular development, JavaScript development, Node.js development, backend development, API development, SaaS development, enterprise software development, maintenance, modernization, optimization, and integrations.
C# Software Development, C# Backend Development, C# API Development, C# Enterprise Development, ASP.NET Core Development, ASP.NET Core Backend Development, ASP.NET Core API Development, ASP.NET Core Web Development, ASP.NET MVC Development, ASP.NET MVC Web Applications, ASP.NET Web API Development, ASP.NET Web API Integration, .NET Framework Development, .NET Framework Maintenance, .NET Framework Modernization.
SQL Development, SQL Server Development, Microsoft SQL Server Development, SQL Database Development, SQL Optimization, SQL Performance Tuning, SQL Integration, SQL Architecture.
React Development, React Frontend Development, React Web Applications, Angular Development, Angular Frontend Development, Angular Web Applications, JavaScript Development, JavaScript Frontend Development, JavaScript Backend Development, Node.js Development, Node.js Backend Development, Node.js API Development.
Software Design, Software Architecture, Backend Architecture, API Architecture, SaaS Development, SaaS Platforms, Enterprise Applications, Enterprise Software, Business Applications, Business Systems, REST API Development, API Integration, Backend Development, Web Application Development, Scalable Software Development.
Artem K.
Senior Full Stack Developer .NET Software Engineer Solution architect
I'm a Top-Rated Upwork freelancer
Are you ready to start working with me?
Iโm not just a programmer. I take the time to understand your business domain, how your processes actually work, and what your users need. This allows me to create a strong connection between your business requirements, our collaboration, and the software we build.
For 17+ years, Iโve been building software professionally, including 13+ years working on real products across multiple companies and industries โ from ERP and education to monitoring, healthcare, SaaS, and enterprise systems.
Iโve worked on products throughout their lifecycle โ understanding business requirements, designing architecture, writing code, integrating systems, optimizing performance, fixing legacy problems, and continuously improving software used by real businesses and users.
At the same time, Iโve built a strong freelance career, delivering 66+ successful software projects worldwide and maintaining a 100% Job Success Score on Upwork. My clients have consistently been satisfied with the results, and many projects have grown into long-term cooperation.
This combination gives me two perspectives that are valuable to my clients:
As a product engineer, I understand what it means to work on a product every day, deal with real users, business processes, technical debt, architecture, and long-term product evolution.
As a freelancer, I understand that your time and money matter. I take responsibility for understanding the problem, communicating clearly, and delivering a solution that actually works for your business.
How I Work With Clients
โญ I donโt simply wait for specifications โ I dive into the business domain and ask questions when something doesnโt make sense.
โญ I provide a transparent real-time development process with active Kanban tasks, planning, progress tracking, and continuous communication.
โญ You can always understand what Iโm working on now, what is planned next, and how the product is progressing.
โญ I use AI-powered development tools for research, coding, debugging, refactoring, documentation, and problem-solving to make development faster and more efficient.
Why Clients Hire Me
โญ 17+ years of professional software development experience
โญ 13+ years working on real products across multiple companies and industries
โญ 66+ successful freelance projects delivered worldwide
โญ Top Rated Upwork Developer with a 100% Job Success Score
โญ Senior C# / .NET Full Stack Developer experienced in SaaS, enterprise software, ERP systems, complex business logic, and legacy modernization
โญ Experience building and maintaining software used by 250,000+ users
โญ Led development for enterprise SaaS platforms with 20+ engineers
โญ Reduced page load time from 30 seconds to 1 seconds
โญ Reduced deployment time from several minutes to under one second
โญ Optimized high-load systems and reduced infrastructure costs by 66%
โญ Strong expertise in software architecture, backend, frontend, databases, cloud integrations, and system optimization
My goal is not simply to write code that matches a specification.
My goal is to understand your business, your product, and the problem we are solving โ and then work with you to build the right solution.
Full Stack .NET Development Services
SaaS Development
โข Full Stack SaaS Development
โข Senior .NET Developer for startup MVPs and enterprise platforms
โข Multi-tenant SaaS architecture
โข REST APIs
โข Authentication & Authorization
โข Subscription systems
โข Admin dashboards
โข Cloud-ready applications
Full Stack Development
โข Full Stack .NET Development
โข C# Development
โข ASP.NET Core
โข Blazor Server
โข Blazor WebAssembly
โข Razor Pages
โข SQL Server
โข Entity Framework Core
โข JavaScript
โข HTML
โข CSS
โข API integrations
Software Engineering
โข Software Architecture
โข System Design
โข Domain-driven application design
โข Performance optimization
โข Refactoring
โข Code reviews
โข Technical leadership
โข Scalable software solutions
Legacy Modernization
โข ASP.NET WebForms โ ASP.NET Core
โข WinForms โ Blazor
โข .NET Framework โ .NET
โข ASP.NET MVC โ Razor Pages
โข Database modernization
โข Performance optimization
โข Cloud migration
Desktop Application Development
โข WinForms
โข Windows Services
โข Enterprise desktop software
โข Background services
โข Hybrid desktop/web solutions
Workflow
Discovery
โข Analyze business requirements
โข Review existing systems
โข Define scalable architecture
Architecture
โข Design maintainable software
Development
โข Senior C# Development
โข Full Stack Engineering
โข Backend development
โข Frontend development
โข API integrations
โข Database design
Optimization
โข Performance tuning
โข SQL optimization
โข Infrastructure optimization
โข Cost reduction
Technologies
C# .NET
ASP.NET Core
Blazor
Blazor Server
Blazor WebAssembly
Razor Pages
Entity Framework Core
SQL Server
JavaScript
TypeScript
HTML5
CSS3
REST API
Microservices
Azure
WinForms
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