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I’m a .NET Developer and C# Developer with 13+ years of experience working on production systems built in C#/.NET.
Most of my work is focused on helping teams make their existing software more stable, scalable, and easier to evolve without risky rewrites.
I’ve worked in long-term roles as a C#/.NET developer, often joining projects where the codebase already exists and needs structure, performance improvements, or careful modernization.
🧠 How clients usually come to me
Very often, teams reach out to me as a .NET developer when they already have a product written in C#/.NET, but something isn’t working as it should.
Changes are slow, bugs appear in unexpected places, or the architecture feels fragile. In those cases, I step in as a C# .NET Developer who understands how real systems grow over time and how to improve them without breaking production.
Depending on the scope, I work either as a backend developer focused on logic and performance, or as a .NET Full Stack Developer when both backend and UI decisions need to be handled together.
⚙️ What I do in real projects
Day to day, my work as a .NET Developer is very practical.
I write and refactor C#/.NET, clean up .NET architecture, improve async flows, and make sure the application behaves predictably in production.
In many projects, this naturally turns into .NET full stack work handling backend services, APIs, and UI integration where I step in as a .NET Full Stack Developer.
When teams want a modern .NET Full Stack direction without splitting the codebase, I build new features or full applications using .NET MAUI/WPF/WinForms. I’ve worked with .NET apps both for new products and for migrations from older stacks like, where stability matters more than speed.
🧩 Types of systems I’ve worked on
Over the years, I’ve worked as a .NET Developer, across different environments:
💻 Desktop software written in C#/.NET
🌐 Web platforms where I worked as a full stack developer on .NET backends
📱 Cross-platform apps built with .NET MAUI (Windows & Android only)
🧱 Larger products that required a true full stack developer approach
🔗 Mixed systems where .NET AI integration was part of the stack
🎮 Internal tools and simulators developed with C#
🤖 Careful use of .NET AI where it actually added value
In several projects, I worked in React .NET setups, connecting React frontends to .NET backends while keeping responsibilities clean and clear.
🛠️ How I work with teams and data
I’m comfortable joining existing teams and reading unfamiliar C#/.NET codebases. I focus first on understanding why decisions were made, then improving things step by step.
I regularly work with SQL server, collaborate with Azure Data Engineer roles, and support data-heavy systems where performance & reliability are critical.
This mix of responsibilities often places me in a .NET Full Stack Developer role even when the original task starts as pure backend work.
🛠️ Tech Stack
.NET Framework, .NET 6 / 8 / 9 / 10
App Development - WPF, WinForms, WinUI, Blazor, .NET MAUI, MVVM
Concurrency & Performance - Multithreading, async/await, Task Parallel Library
Hardware & Protocols - Serial, Bluetooth LE, TCP/IP, UDP, RS232, RS422
Architecture & Quality - Clean Architecture, OOP, refactoring, performance tuning
Security & Testing - Unit testing, Polaris, Coverity, SAST, DAST, threat modeling
Data & Cloud - SQL Server, Azure
Tooling - Visual Studio, VS Code, GitHub, GitHub Actions, Docker
✅ Why clients choose to work with me
✨ I think like a long-term .NET Developer, not a short-term task runner
✨ I write C# code that other C# developers can actually maintain
✨ I’m comfortable owning systems as a .NET Full Stack Developer
✨ I communicate clearly and avoid surprises
✨ I leave .NET full stack codebases cleaner and more stable than I found them
📌 Availability
✅ Available now
🌍 Remote-only
⏱️ Open to long-term collaboration
If you’re looking for a .NET Developer, who can step into an existing system and improve it safely let’s chat.
👉 Send a message and we’ll review your setup together.
Windows Presentation Foundation
.NET Framework
Universal Windows Platform
Windows Forms
Standalone Application
Desktop Application
Application Improvement
C#
Python
Microsoft Visual C++
Docker
Ubuntu
GitHub
Android App Development
Bash Programming
Microsoft Windows PowerShell
Prototyping
Microsoft Azure
PostgreSQL
Angular
Igor B.
Novi Sad, Serbia
$45/hr
5.0
4 jobs
- 8+ years of experience in C++, C#
- Windows services, Desktop app development
- Expertise in RPC, SOCI, SQLite, MySQL, Postgres
- Skilled in multithreading, IPC, and performance optimization
- Development of scalable backend services and distributed systems
- Proficient in CMake
- Strong debugging skills with GDB, Valgrind
- Unit & integration testing using GTest
- Experience in industrial automation, including .NET-based systems communicating with PLCs, OPC servers, and ERP environments, as well as serialization/aggregation solutions for packaging lines
- Industrial automation (PLC, OPC UA, MQTT)
Automation
Automotive
Fortran
C++
Appium
.NET Core
C#
Linux
Git
Energy & Utilities
Desktop Application
SQLite
MySQL
PostgreSQL
Power Systems Engineering
Arduino
MQTT
Venugopal J.
Leander, Texas
$50/hr
5.0
27 jobs
Okta Certified Professional and Administrator.
Experienced Technical Architect with domain expertise in e-
commerce, health care and financial. experienced in developing
web and portal applications using various skills Java, J2ee, Spring,
hibernate, SOAP, REST, Angular, React, NodeJs, typescript, Rest API, Google Analytics and Power BI.
Good experience in Identity and Access management (IAM/IDM)
solution using several products: Okta, Azure AD, B2C, PING, PINGONE, Davinci, OIM, SAML, OIDC, Jumpcloud, SailPoint, Saviynt, SSO (Single sign on) and Hubspot.
Google analytics (GAIQ).Have worked for several private and gov clients.
RESTful API
Microsoft Power BI
Angular
OAuth
OKTA
Java
Microsoft Azure
API Integration
jQuery
Microsoft Active Directory
Single Sign-On
Spring Boot
SailPoint Technologies IdentityIQ
React
Auth0
Maroof K.
Shahjahanpur, India
$30/hr
5.0
9 jobs
I help businesses build enterprise-grade .NET desktop and integration solutions that connect software with healthcare systems, industrial hardware, and complex document standards.
With over 15 years of professional experience, I have successfully delivered Windows desktop applications, enterprise web portals, workflow automation, and high-performance backend systems for clients in the USA, UK, and Australia.
My primary areas of specialization include:
✔ .NET Desktop Development
C#
WPF
WinForms
.NET MAUI
Windows Services
Windows API
Driver communication
Hardware integration
✔ Healthcare EDI Integration
ANSI X12
EDI 837P
EDI 837I
EDI 835
EDI 277
EDI 999
Clearinghouse integrations
Healthcare billing workflows
✔ S1000D / DITA Technical Publications
XML processing
BREX
Data Modules
Descript
Proced
IPD
Fault Isolation
Schema validation
XSLT
Publishing automation
✔ Biometric & Device Integration
ZKTeco
eSSL
Mantra
Cogent
Suprema
Safran
Fingerprint SDKs
Attendance systems
USB and serial device communication
I also develop secure backend services and modern web applications using ASP.NET Core, Blazor, Entity Framework Core, SQL Server, REST APIs, GraphQL, Azure, and cloud-native architectures.
Beyond software development, I have implemented intelligent automation using AI technologies including Retrieval-Augmented Generation (RAG), Large Language Models (LLMs), Azure OpenAI, Semantic Search, MCP, OCR, document processing, and workflow automation.
Clients hire me because I focus on solving complex integration challenges that many developers avoid—whether it's communicating with specialized hardware, processing EDI transactions, implementing S1000D publishing workflows, or modernizing legacy Windows applications.
If your project involves enterprise software, healthcare integrations, industrial devices, or mission-critical desktop applications, I'd be happy to discuss how I can help.
C++
Microsoft SQL Server
.NET Core
Software Architecture & Design
.NET Framework
ASP.NET Web API
C#
ASP.NET MVC
Blazor
Windows Presentation Foundation
Windows Forms
VB.NET
Git
Visual Basic
React
Oscar P.
Santo Domingo Oeste, Dominican Republic
$30/hr
5.0
66 jobs
Top-Rated Plus Freelancer | Senior .NET Engineer | API Integrations | Legacy Modernization | AI-Assisted Automation
I am a Senior Software Engineer with over 20 years of professional experience helping companies modernize legacy systems, build reliable APIs, and integrate complex business platforms.
I started my career working with Visual FoxPro and desktop-based enterprise applications, and later transitioned to the .NET ecosystem, where I have spent many years building scalable backend systems using C#, ASP.NET, and SQL Server. This background allows me to work comfortably with both legacy and modern technologies, acting as a bridge between old systems and new architectures.
In recent years, I have also incorporated AI-assisted tools and platforms into my workflow to improve automation, data analysis, and development efficiency, including experience with Abacus.AI for AI-driven insights and process optimization.
What I specialize in
Legacy system modernization (Visual FoxPro, Delphi → .NET / ASP.NET Core)
API development and system integrations (REST & SOAP)
ERP and HR system integrations (Epicor, ADP, Workday, SAP)
Database-driven applications (SQL Server, Oracle, MySQL)
Automation and productivity solutions (AutoIT)
AI-assisted automation and data analysis
How AI adds value to my work
AI-assisted development for faster debugging, refactoring, and optimization
Using AI tools to improve reporting, data interpretation, and business insights
Supporting automation workflows with AI-driven analysis
Enhancing legacy systems with modern, intelligent components
Recent work highlights
Migrated legacy Visual FoxPro applications to C# and ASP.NET with SQL Server backends
Integrated payroll and HR platforms (ADP, Workday) with custom ERP systems
Designed and implemented RESTful APIs for multi-system environments
Applied automation and AI-assisted tools to reduce manual processes
Led small development teams on long-term enterprise projects
Technical Skills
Languages & Frameworks: C# (.NET, ASP.NET, ASP.NET Core, WinForms, WPF), Visual FoxPro, Delphi, Angular, AutoIT, Java
Databases: SQL Server (T-SQL), Oracle (PL/SQL), MySQL
APIs & Integrations: REST, SOAP, third-party and internal systems
Reporting: SSRS, Crystal Reports
ERP & Business Systems: Epicor, SAP, ADP, Workday
AI & Automation: Abacus.AI, AI-assisted development, automation workflows
Tools: SSIS, Inno Setup, InstallShield
I am a reliable, detail-oriented professional who values clean code, clear communication, and long-term collaboration.
If you need help modernizing a legacy system, integrating APIs, or enhancing your applications with automation and AI-assisted solutions, I’d be glad to work with you.
SQL
C#
Data Migration
Autoit
Windows App Development
Visual FoxPro
ASP.NET
FoxPro Programming
Inno Setup
Angular 4
Desktop Application
Oracle PLSQL
Microsoft Windows
Android
Database Integration
Ghulam M.
Lahore, Pakistan
$60/hr
4.9
241 jobs
I'm a Full-Stack Developer & Solutions Architect with 12+ years of experience building secure Identity & Access Management (IAM) solutions, AI-powered automation, enterprise SaaS applications, and Microsoft 365/Google Workspace integrations.
I help businesses improve security, automate workflows, reduce operational costs, and build scalable software that delivers measurable business results.
Core Expertise
✅ SSO & Identity & Access Management (SAML, OAuth 2.0, OpenID Connect, SCIM)
✅ AI Automation & Workflow Development using n8n and Large Language Models
✅ Microsoft 365 & Google Workspace Add-in Development
✅ Enterprise SaaS Development & API Integrations
✅ Full-Stack Development with modern cloud technologies
Business Results
✅ Reduced login friction and authentication support requests by up to 80% through secure SSO, Multi-Factor Authentication, Passwordless Authentication, and Zero Trust architecture.
✅ Reduced user onboarding from days to minutes using Identity Federation, automated SCIM provisioning, and role-based access management.
✅ Automated end-to-end business workflows using n8n, AI services, CRMs, webhooks, and third-party integrations, reducing operational overhead by up to 60%.
✅ Increased team productivity by up to 40% through custom Microsoft Office and Google Workspace add-ins that automate repetitive tasks and integrate business systems.
✅ Improved security and compliance with SOC 2, ISO 27001, GDPR, PKI, and enterprise identity management best practices.
✅ Built highly scalable multi-tenant SaaS platforms supporting thousands of organizations with high availability and fast authentication performance.
Selected Experience
✅ Delivered 100+ SSO and IAM integrations across Okta, Auth0, Microsoft Entra ID, Google Workspace, AWS Cognito, Ping Identity, ADFS, and Salesforce.
✅ Designed and built a multi-tenant Identity Broker allowing customers to connect multiple identity providers in minutes.
✅ Developed 30+ AI automation workflows integrating OpenAI, Claude, enterprise APIs, webhooks, and business applications.
✅ Built 15+ Microsoft Office and Google Workspace Add-ins using Office.js, VSTO, SharePoint Framework, Microsoft Graph, and Google Apps Script.
✅ Developed 20+ SaaS applications from MVP to enterprise scale with AI automation, API orchestration, and cloud-native architecture.
✅ Implemented secure PKI, digital signatures, and blockchain-based document verification solutions.
Technical Skills
Identity & Access Management:
SAML • OAuth 2.0 • OpenID Connect (OIDC) • SCIM • JWT • MFA • Zero Trust • RBAC • ABAC • Identity Federation • CIAM
AI & Automation:
n8n • OpenAI • Claude • LangChain • RAG • Prompt Engineering • Workflow Automation • Zapier • Make
Microsoft & Google:
Office.js • VSTO • SharePoint Framework • Microsoft Graph • Google Apps Script • Google Workspace APIs
Frontend:
React • Next.js • Angular • Vue • TypeScript
Backend:
.NET / C# • Node.js • Python • PHP • Laravel • Django
Cloud & DevOps:
AWS • Azure • Docker • CI/CD • Microservices • Serverless Architecture
Databases:
MySQL • Oracle • MongoDB
Security:
PKI • Cryptography • Digital Signatures • Blockchain Document Security
Why Work With Me?
✅ 12+ years of professional experience
✅ 200+ successful projects delivered
✅ Business-focused solutions that improve security, productivity, and automation
✅ Clean, scalable, and maintainable code
✅ Reliable communication and long-term technical partnership
If you're looking for an expert in Identity & Access Management, AI automation, Microsoft 365 development, Google Workspace integrations, or enterprise SaaS development, I'd be happy to discuss your project and help you build a secure, scalable, and future-ready solution.
C#
D3.js
ASP.NET MVC
Vue.js
AngularJS
CSS 3
React
Node.js
React Native
JavaScript
Python
Single Sign-On
Office 365
User Authentication
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