You will get a complete Microsoft 365 Outlook calendar sync built into your app
Top Rated
Top Rated
Project details
You will get a production-ready Microsoft 365 Outlook calendar integration built into your .NET application by a UK developer with 8+ years of experience and 100% Job Success on Upwork.
Most recently shipped the full Outlook integration for Chronicle, a UK workforce management SaaS. Users connect their Outlook account once via OAuth, and absences, holidays and sick days created in the app push straight into their personal calendar with create, update and delete all flowing through cleanly. Happy to share a short Loom of it running before you buy.
What separates this from a quick Graph API wire-up is how token refresh, throttling and duplicate prevention get handled. Calendar integrations break in subtle ways months after launch when tokens expire silently, Graph hits a 429 mid-sync, or duplicate events pile up after a redeploy. The integration uses scheduled jobs for token and calendar refresh, stable event IDs to prevent duplicates, and exponential backoff on throttling so it stays reliable at scale.
Comfortable across .NET Framework, .NET Core, Blazor Server, ASP.NET MVC, Web API and SQL Server or PostgreSQL.
Most recently shipped the full Outlook integration for Chronicle, a UK workforce management SaaS. Users connect their Outlook account once via OAuth, and absences, holidays and sick days created in the app push straight into their personal calendar with create, update and delete all flowing through cleanly. Happy to share a short Loom of it running before you buy.
What separates this from a quick Graph API wire-up is how token refresh, throttling and duplicate prevention get handled. Calendar integrations break in subtle ways months after launch when tokens expire silently, Graph hits a 429 mid-sync, or duplicate events pile up after a redeploy. The integration uses scheduled jobs for token and calendar refresh, stable event IDs to prevent duplicates, and exponential backoff on throttling so it stays reliable at scale.
Comfortable across .NET Framework, .NET Core, Blazor Server, ASP.NET MVC, Web API and SQL Server or PostgreSQL.
Programming Languages
JavaScript, ASP.NET, C#Coding Expertise
Cross Browser & Device Compatibility, Performance Optimization, SecurityWhat's included
| Service Tiers |
Starter
$800
|
Standard
$1,600
|
Advanced
$2,600
|
|---|---|---|---|
| Delivery Time | 5 days | 10 days | 18 days |
Number of Revisions | 2 | 3 | 5 |
Number of Pages | 1 | 2 | 4 |
Design Customization | - | - | - |
Content Upload | - | - | - |
Responsive Design | - | ||
Source Code | - |
Optional add-ons
You can add these on the next page.
Two-way sync from Outlook back to app
(+ 3 Days)
+$500
Meeting invites and attendee management
(+ 3 Days)
+$500
Teams calendar integration
(+ 3 Days)
+$500Frequently asked questions
About EHTISHAM
Full Stack| ASP.NET Core | C# | MAUI | Blazor | Angular | SQL | Azure
100%
Job Success
Newcastle upon Tyne, United Kingdom - 12:49 am local time
**ASP.NET CORE | WEB API | C# | MICROSERVICES | DOCKER | BLAZOR | MAUI | SQL SERVER | AZURE | ANGULAR**
Looking for someone who doesn’t just code, but thinks through problems and delivers solutions that actually work? You’ve found the right developer.
📊 Track Record That Speaks:
🏅 TOP-RATED PLUS
🏆 100% Job Success Rate
⭐ 5-Star Client Reviews
💰 $100k+ Platform Earnings
🔥 40+ Successful Projects
⚡ 4k+ Upwork Hours
🎯 Zero Failed Deliveries
🛠️ Core Tech Stack:
Backend: .NET 9, ASP.NET Core 8, C#, Web API, Microservices
Frontend: Blazor (Server/WASM), Angular 17, JavaScript/TypeScript, Html5, CSS3, Jquery
Database: SQL Server, PostgreSQL, MongoDB, Azure Cosmos DB,Firebase
Cloud: Azure, AWS, Docker, Kubernetes
Payments: Stripe, PayPal, Square, Authorize.Net, Braintree
APIs: REST, GraphQL, SOAP, OAuth 2.0, JWT
Tools: Visual Studio 2022, Git, Azure DevOps, Jira
💡 What Sets Me Apart:
I don’t just write code - I architect solutions. When you’re dealing with complex business requirements, you need someone who can translate abstract concepts into robust, scalable systems.
Recent Wins:
- Built secure payment processing system with Stripe (handling $50k+ monthly)
- Migrated legacy .NET Framework app to .NET 8 (40% performance boost)
- Integrated multi-vendor marketplace with PayPal, Stripe & bank transfers
- Implemented real-time analytics dashboard with SignalR
- Designed Azure-native solutions reducing infrastructure costs by 35%
🎯 Specialized In:
✅ Enterprise Web Applications
✅ Payment Gateway Integration (Stripe, PayPal, Square)
✅ Third-Party API Integration & Development
✅ REST/GraphQL API Development
✅ Cloud-Native Architecture
✅ Database Optimization & Design
✅ Legacy System Modernization
✅ Performance Tuning & Scaling
💳 Payment & Integration Expertise:
-Payment Gateways:Stripe Connect, PayPal Express, Square APIs, Authorize.Net
- Financial APIs: Plaid, Dwolla, banking integrations, cryptocurrency payments
- Third-Party Services: Twilio, SendGrid, AWS SES, Google Maps, social logins
- E-Commerce: Shopping cart integration, subscription billing, marketplace commissions
- Security: PCI compliance, fraud detection, secure tokenization
🏭 Industry Experience:
E-Commerce • FinTech • Healthcare • Real Estate • SaaS • Logistics • Marketplaces
⚡ My Process:
1. Deep Dive - I actually read your requirements (shocking, right?)
2. Smart Planning - Break complex problems into manageable pieces
3. Agile Delivery - Regular updates, no surprises
4. Quality Focus** - Clean code, proper testing, documentation
🌍 Availability:
📍 UTC+1 Timezone
⏰ 30-40 hrs/week
🗣️ Fluent English
📞 Flexible communication
Why Choose Me?
I’ve been where you are. Tight deadlines, complex requirements, budget constraints. I get it. That’s why I focus on delivering solutions that work reliably, scale properly, and don’t break the bank.
Every project gets:
- Detailed technical documentation
- Clean, maintainable code
- Comprehensive testing
- Post-delivery support
- NDA protection
Ready to build something amazing? Let’s talk about your project.
Ehtisham Zaki
Senior .NET Architect & Full-Stack Developer
-----
*Keywords: ASP.NET Core, C#, Blazor, Microservices, Azure, SQL Server, Web API, Angular, Docker, DevOps, Cloud Architecture, Enterprise Applications, Stripe Integration, PayPal API, Payment Processing, Third-Party APIs*
Steps for completing your project
After purchasing the project, send requirements so EHTISHAM can start the project.
Delivery time starts when EHTISHAM receives requirements from you.
EHTISHAM works on your project following the steps below.
Revisions may occur after the delivery date.
Kickoff call and Azure AD app registration
Quick call to walk through your existing app, confirm sync scope and direction. Azure AD app registration created or reviewed, with Graph API permissions and redirect URLs configured.
OAuth connect flow and token storage
Microsoft 365 sign-in flow added to your app so users can connect their Outlook in one click. Access and refresh tokens stored securely against the user record.