- 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
Junian T.
Surabaya, Indonesia
$30/hr
4.9
175 jobs
• Also known as Windows and macOS App Developer Expert
• I use AI, obviously. I mean, who doesn't?
• 5+ years of experience
• I work on backend, frontend, databases, and Linux server administration
• Main stack: .NET (C# / Visual Basic) and TypeScript / JavaScript
• I build web and multi-platform desktop/mobile applications
📚 Technologies
• My main tech stack is .NET (C# or Visual Basic .NET) and TypeScript / JavaScript
• For .NET, I work with ASP .NET, Blazor, WPF, Windows Forms, MAUI (formerly Xamarin), Avalonia UI, and more
• For TypeScript / JavaScript, I prefer React, but I can also work with Angular, jQuery, or vanilla JS
• I can also develop macOS and iOS apps using Swift and Objective-C
🗼 Server Administration and DevOps
• Familiar with Debian-based Linux distributions like Ubuntu
• Able to handle VPS baremetal or Docker-based setups
• Able to automate workflows using Bash, Python, GitHub Actions, and similar tools
• Experienced with cloud services such as AWS and Azure
📊 Database
• Microsoft SQL Server
• MySQL / MariaDB
• SQLite
• PostgreSQL
• Microsoft Access
💡 Skills
• Strong in algorithm design and analysis
• Great ability to solve programming and system trouble
• Great at optimizing software performance
• Flexible work style
• Adaptive team player
📖 Self-Update
• I regularly study new technologies to stay up to date.
🕰️ Flexible Availability
• Open to collaborate across multiple time zones (US, CA, UK, EU, APAC, etc.)
✅ I’m not a robot.
• I’m a real human and a solo freelancer, not an agency
🙌 Let’s Connect!
• My name is Junian and I’d love to help bring your ideas to life
• Feel free to reach out so we can discuss how I can support your project
• Not a Vibe Coder, but use AI-Assisted Programming tools to solve problems
• Linus Torvalds once said, “Talk is cheap. Show me the code.” So go ahead and check out my GitHub code.
🛠️ Common Tasks and Roles
• Known as the Apple / macOS / iPhone guy
• Build Windows app with .NET Framework & Windows Forms (WinForms) / Windows Presentation Foundation (WPF) / WinUI / Avalonia UI / MAUI / Xamarin
• Build Windows Installer MSI / EXE from existing Windows App by using Wix / WixSharp
• Build macOS app with Swift UI or .NET & Avalonia UI / MAUI / Xamarin
• Build, sign, and notarize macOS app installer (PKG / DMG / ZIP)
• Build web app with ASP .NET & Blazor / React / Angular / Vanilla JavaScript
• Deploy and configure existing web apps by using Docker container to VPS / Cloud providers like AWS, Azure, or GCP
• Ethical decompile / reverse engineer / source code retrieval / deobfuscation of existing .NET EXE / DLL / MSI or NinjaTrader Trading Indicator / strategy
• Automate Windows UI tasks
• Web scraping to retrieve online data / PDF / Images / any other files
• Expert macOS system and app troubleshooting
🙋♂️ What I'm not
• I'm not a Vibe Coder. Don't get me wrong, I use AI to build software, but I don't solely rely on it.
.NET Framework
C#
Desktop Application
Docker
JavaScript
macOS
Windows Presentation Foundation
Windows Forms
Windows App Development
ASP.NET
Database
TypeScript
Node.js
Linux System Administration
Web Development
.NET Core
ASP.NET Core
iOS Development
Flutter
Xamarin
Rahul M.
Pune, India
$55/hr
5.0
38 jobs
Need a secure, seamless Single Sign-On (SSO) solution for your business? I can help.
I’m a Senior IAM Consultant with 8+ years of experience specializing in Identity and Access Management (IAM). I design and implement robust authentication systems using Okta, Microsoft Entra ID (Azure AD), Keycloak, Shibboleth, OneLogin, Auth0, OpenFGA, and custom SAML 2.0, OAuth 2.0, and OpenID Connect (OIDC) providers. I also have expertise in LDAP, WS-Fed, RADIUS, JWT, and other authentication protocols to simplify access control and safeguard critical data.
My Expertise:
✅ SSO & Authentication Solutions – Implementing SAML 2.0, OAuth 2.0, JWT-based logins, API key-based security, and server-to-server authentication.
✅ IAM Integration & Setup – Configuring Okta, Microsoft Entra ID, Keycloak, ADFS, OneLogin, Auth0, Identity Server 8, and other IAM providers, Simple SAML PHP.
✅ Troubleshooting Authentication Issues – Resolving login-related issues for SAML, OAuth, and custom identity providers.
✅ Fine-Grained Authorization – Deploying reverse proxy and bridge solutions, OpenFGA, and custom authorization mechanisms.
✅ User Provisioning & Governance – Secure provisioning/de-provisioning of users, groups, and resources via SCIM, custom scripts, or scheduled sync with databases, Active Directory, or other identity sources.
✅ Multi-Factor Authentication (MFA) & Identity Governance – Enhancing security with strong IAM policies.
Technical Skills:
I am proficient in PHP, Java, JavaScript, Python, Golang, Shell Scripting, and various frameworks, including Spring, Spring Boot, Node.js, React, Angular, Django, WordPress, CodeIgniter, Symfony, Laravel, Gin, and more.
DevOps & Cloud Security:
✅ Cloud & On-Prem Infrastructure – Hands-on experience with AWS, EKS, EC2, Kubernetes (K8s), Docker, KAAS, SAAS, and on-prem deployments.
✅ Application Deployment & Security – Securing and deploying applications in cloud and on-prem environments.
🛠️ Identity Providers I’ve Worked With (100+):
✅ Google SSO login
✅ Microsoft Entra ID (Azure AD) SSO
✅ Okta SSO Integration
✅ Keycloak SSO
✅ Oracle IAM – OCI IAM, OAM, OIM
✅ Oracle Student Financial Aid (SFA)
✅ GitHub SSO
✅ Ping Federate SSO Login
✅ Auth0 Universal Login Setup
✅ OneLogin SSO Integration
✅ Shibboleth IdP/SP
✅ JumpCloud SSO Login
✅ ForgeRock IAM
✅ IdentityServer4/8
✅ WSO2 Identity Server
✅ SimpleSAMLphp
✅ Custom SAML SPs
✅ AWS Cognito SSO
✅ Salesforce SSO
✅ G Suite Login
✅ Apple & Facebook OAuth
✅ Slack / Zoom OAuth Integration
✅ ADFS (Active Directory Federation Services)
✅ LDAP & RADIUS Authentication
✅ CyberArk Identity
✅ Centrify (now Delinea)
✅ IBM Security Verify / Tivoli Access Manager
✅ NetIQ Access Manager / Micro Focus
✅ Bitwarden SSO / Enterprise Login
✅ Duo SSO (Cisco Secure Access)
✅ VMware Workspace ONE Access (formerly vIDM)
✅ Zoho Directory / SSO
✅ Atlassian Access (Jira, Confluence SSO)
✅ SAP IAS / IPS
✅ Azure B2C & B2B Flows
✅ Facebook Workplace SSO
✅ Moodle SSO (via SAML / OIDC plugins)
✅ Canvas LMS SSO Integration
✅ OpenAM (legacy Sun Access Manager)
✅ FreeIPA / Red Hat SSO
✅ Ory Hydra / Kratos
✅ FusionAuth
✅ Gluu Server / Janssen Project
✅ NetIQ eDirectory SSO
✅ Apache Knox (for Hadoop ecosystem)
✅ IBM ISAM / ISVA
✅ Citrix Gateway (SSO via SAML/OAuth)
✅ Palo Alto Prisma Access (SAML Integration)
✅ CrowdStrike Falcon Identity
✅ BeyondTrust Identity Security
✅ Keeper Enterprise SSO
✅ Zoho One / Zoho Directory
✅ Freshworks SSO (Freshservice, Freshdesk)
✅ ServiceNow SSO Integration
If you're looking for an IAM expert who can secure your authentication workflows, integrate IAM solutions, and troubleshoot identity-related challenges, let's connect!
Single Sign-On
Security Assertion Markup Language
OAuth
OKTA
Auth0
OneLogin
Linux
NGINX
User Authentication
Web Proxy
LDAP
Multi-Factor Authentication
Active Directory Federation Services
Shopify
Shopify Development
Goodson Nyasha M.
Harare, Zimbabwe
$25/hr
4.4
62 jobs
Senior .NET Developer C#, .NET 8, Blazor, ASP.NET Core, WPF, Azure. 7+ years' experience, 11,000+ hours on Upwork, 100% long-term client retention on enterprise web and desktop applications.
I help companies build and modernize business-critical software: web apps in Blazor and ASP.NET Core, desktop apps in WPF and WinForms, and cloud deployments on Azure — as a solo contributor or embedded in your remote team.
Results clients hired me for:
Built a large-scale enterprise file management platform (Blazor + Syncfusion) integrating Azure Blob, SharePoint, OneDrive, Google Drive, and SMB
Cut UI response times 30% with rich interactive Blazor components for a financial market analytics app
Improved data processing efficiency 20% via secure REST APIs, Odoo ERP integrations, and React/TypeScript components
Maintained 99.9% uptime on Azure-hosted production systems with robust monitoring and CI/CD
Core stack:
C#, .NET 8, ASP.NET Core MVC, Blazor (Server & WebAssembly), WPF, MAUI, WinForms, Entity Framework, Dapper
SQL Server, PostgreSQL, MySQL, Oracle, SQLite
Azure (Blob Storage, Functions, DevOps, CI/CD), Docker, IIS, Git
Syncfusion, DevExpress, Crystal Reports, RDLC, Bold Reports
Clean Architecture, Microservices, REST APIs, JWT/OAuth2, Swagger
I use AI-assisted development (GitHub Copilot, Claude) to ship faster without compromising quality. Message me about your project and I respond within a few hours.
Microsoft SQL Server
.NET Framework
C#
Database Development
Xamarin
ASP.NET MVC
XAML
ASP.NET Web API
Blazor
Azure DevOps
Windows Presentation Foundation
Desktop Application
Model View ViewModel
.NET Stack
Enterprise Software Development
AI Consulting
AI Development
AI Video Generation
AI Model Integration
AI Data Analytics
Shyam Sundar S.
Kathmandu, Nepal
$35/hr
4.9
356 jobs
🏆 10+ Years Experience | ⏱️ 12,000+ Upwork Hours | ⭐ 100% JSS | 🏅 AWS Certified Developer – Associate | 🏅 Microsoft Certified: Azure Fundamentals (AZ-900) | 🏅 Microsoft Certified: Azure Data Fundamentals (DP-900) | 🤖 AI Agent Development (OpenAI • Claude) | 🚀 300+ Projects Delivered
I engineer secure, enterprise-grade Microsoft ecosystems. I specialize in bridging corporate data with modern workflows—transforming legacy infrastructures into intelligent environments using Microsoft 365 Copilot, Azure OpenAI, Semantic Kernel, and advanced AI Agents.
If your enterprise needs to automate complex workflows, securely integrate custom AI tools, or modernize legacy systems without risking data leaks, I provide the senior architectural oversight to deliver.
Enterprise Copilot & AI Integration
Custom AI agents (Copilot, Claude, OpenAI APIs), Copilot Studio plugins connecting M365 Copilot to external databases, and secure Azure OpenAI / Semantic Kernel deployments — built to pass enterprise security review, not just demo well.
Microsoft 365 & Graph API Architecture
Deep Graph API integrations across Teams, Outlook, and SharePoint. Modern Office.js add-ins and legacy VSTO development for Excel/Word/Outlook. Power Automate workflows and custom connectors for teams retiring manual processes.
Cloud Backend & Identity Security
ASP.NET Core APIs and Azure Functions on .NET 8/9. OAuth2, OpenID Connect, and Microsoft Entra ID SSO. Legacy .NET Framework → modern .NET migrations. Cross-platform desktop via WPF, WinForms, and .NET MAUI.
Availability: Europe time zone, with daily overlap into EST — real-time collaboration for US and EU teams.
CERTIFICATIONS & TRUSTED CREDENTIALS
• Microsoft Certified: Azure Fundamentals (AZ-900)
• Microsoft Certified: Azure Data Fundamentals (DP-900)
• AWS Certified Developer – Associate
I work directly with enterprise stakeholders and technical teams to deliver clean architecture, strict data compliance, and long-term maintainability. Let’s connect to build your next-generation Microsoft ecosystem.
C#
Windows Presentation Foundation
ASP.NET Core
Microsoft Azure
Entity Framework
Windows App Development
Microsoft Outlook Development
Google Chrome Extension
Microsoft Power Automate
Node.js
REST API
React
AWS Development
Angular
Claude
Javed K.
Mahuva, India
$25/hr
5.0
88 jobs
🚀 Senior .NET & Mobile App Architect (10+ Years Experience)
Specialized in .NET MAUI, React Native, Xamarin-to-MAUI Migrations, Hardware/IoT Integration & High-Performance APIs, Web and Backend development.
Are you looking to modernize legacy Xamarin apps to .NET MAUI, integrate specialized third-party hardware (NFC, MagStripe, BLE, Medical Devices), or engineer robust backend APIs and SQL databases or looking for Mobile Application Developer?
I specialize in building high-performance, maintainable, and enterprise-grade software using the modern Microsoft .NET ecosystem. Over the past decade, I have delivered scalable solutions for global clients, including successfully migrating 10+ mission-critical Xamarin apps to .NET MAUI and integrating complex external hardware and health sensor protocols.
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💡 CORE SPECIALIZATIONS & SERVICES
━━━━━━━━━━━━━━━━━━━━━━━━━━━━
🔹 Xamarin to .NET MAUI Modernization:
• 10+ successful legacy migrations from Xamarin.Forms/Native to .NET 8 / .NET 9 / .NET 10 MAUI.
• Complete migration of legacy Xamarin.Forms / Native codebases to .NET 8 / .NET 9 / .NET 10 MAUI.
• Refactoring legacy architectures to modern MVVM with CommunityToolkit and Dependency Injection.
• Custom handlers, third-party plugin upgrades, and multi-targeting (iOS, Android, Windows, macOS).
🔹 Cross-Platform Mobile & Desktop (.NET MAUI / Xamarin / WPF / React Natvie):
• Production-ready .NET MAUI, Xamarin, and WPF/Desktop enterprise solutions.
• Clean XAML design, smooth rendering, custom controls, and platform-native API bridges.
• Modern MVVM architecture (CommunityToolkit.Mvvm), Dependency Injection, and custom handlers.
• Cross-platform desktop solutions (WPF, MAUI Windows/macOS) with responsive XAML layouts.
• Complete App Store and Google Play deployment, provisioning, SDK target compliance, and CI/CD pipelines.
🔹 Third-Party Hardware, Sensors & Health Device Integration:
• Point-of-Sale / Card Hardware: Native integration with Magnetic Stripe Readers (MagStripe), NFC tags, and mobile card readers.
• Health & Medical Tech: Real-time integration and data synchronization with Continuous Glucose Monitoring (CGM) devices, BLE medical sensors, and health telemetry.
• Low-level Bluetooth Low Energy (BLE), USB, and Serial communication pipelines.
🔹 Backend, Databases, Cloud & API Architecture:
• High-throughput RESTful Web APIs and Microservices using ASP.NET Core / C#.
• Database design, performance tuning, and ORM integration (MS SQL Server, Entity Framework Core, SQLite).
• Secure authentication (JWT, OAuth2), real-time sockets, and background telemetry processing.
• Database architecture, indexing, and query optimization on Microsoft SQL Server and SQLite.
• Clean Architecture, Domain-Driven Design (DDD), and SOLID design principles.
🔹 Full-Stack Web Development (.NET + Angular):
• Modern Single Page Applications (SPAs) built with Angular and TypeScript.
• High-performance, clean RESTful APIs and Microservices using ASP.NET Core / C#.
• State management, reusable UI components, role-based security (JWT/OAuth2), and seamless backend integration.
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🛠️ TECHNICAL EXPERTISE
━━━━━━━━━━━━━━━━━━━━━━━━━━━━
• Languages & Frameworks: C#, .NET 8 / .NET 9 / .NET 10, .NET MAUI, Xamarin (Forms/Native), React Natvie, ASP.NET Core, WPF
• Web & Frontend: Angular, TypeScript, HTML5, CSS3, JavaScript
• Hardware & Protocols: NFC, MagStripe, Continuous Glucose Monitors (CGM), BLE (Bluetooth Low Energy), USB/Serial APIs
• Backend & APIs: ASP.NET Core, C#, Web API, Microservices, SignalR
• Architecture & Patterns: Clean Architecture, MVVM, SOLID Principles, Repository Pattern, Dependency Injection
• Databases & ORM: MS SQL Server, SQLite, Entity Framework Core, Dapper
• Tooling & Cloud: Azure DevOps, Git, Visual Studio, Docker, CI/CD, Native SDK Bindings
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⭐ WHY WORK WITH ME?
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✔ 10+ Years of proven software delivery across startups and enterprises.
✔ End-to-end fluency across all .NET platforms (Mobile, Web, Desktop, Cloud, Backend).
✔ Proven track record interfacing .NET MAUI with external sensors, medical tech, and payment hardware.
✔ Clean, modular, and self-documenting code built for long-term maintainability.
✔ Transparent communication, proactive problem-solving, clear milestone tracking, and dependable turnaround.
Let’s discuss your project requirements. Click "Invite" or "Send Message" to schedule a brief consultation!
Mobile App Development
Infovisa MAUI
Xamarin
.NET Stack
SaaS
Model View ViewModel
iOS Development
Android App Development
C#
React Native
Azure DevOps
SQL
Angular
ASP.NET
MVC Framework
Web API
TypeScript
Bluetooth LE
NFC
Desktop Application
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Summa Linguae
At A Glance: WinAutomation Scripting
In today’s fast-paced world, time is a precious commodity. For the majority of contemporary individuals, each day is filled with tasks, from the menial to the vitally important. In business, as in personal life, it’s essential to keep focused and prioritize in order to maintain stability and obtain success. WinAutomation is a computer application that automates repeatable tasks that can otherwise be quite time-consuming. WinAutomation can automatically fill and submit web forms with data from local files, and pre-record keystrokes and mouse clicks. It can scrape and extract data from web pages, importing it to Excel or text files. In addition, it can retrieve and parse emails, and update and maintain a database containing information contained in emails. WinAutomation can also rename, edit, copy, move, compress, and manage files and folders, and it’s capable of downloading and uploading files or folders on a schedule, launching applications, taking screenshots, and manipulating or moving windows. Any task can be automated with the advanced task scheduler, and tasks can be converted into applications that can be easily shared with colleagues.
On Upwork, you can post your WinAutomation project for free, and browse the profiles of numerous qualified and experienced freelance professionals who can assist you. He or she will evaluate your specific needs in order to customize your WinAutomation system. The experts on Upwork’s global marketplace are in tune with the quickly-evolving technology world, and understand the importance of efficiency, accuracy, and time management. These professionals offer flexible schedules and quick turnaround times, and will be available to support you through each stage of the process.