Google & Outlook Calendar Sync Development

@aftabyounas

I can do this project. I am a Senior Developer with deep experience in OAuth 2.0 and native API integrations, ready to build a high-scale, 2-way sync engine for your CRM without middlemen.

@ZohaibRoy

⭐⭐⭐⭐⭐ Expert Developer for Native 2-Way Google & Outlook Calendar Sync ❇️ Hi My Friend, I hope you are doing well. I just reviewed your project requirements and see you are looking for an expert developer for calendar synchronization. Look no further; Zohaib is here to help you! My team has successfully completed 50+ similar projects focused on calendar integrations. I will implement robust backend sync logic to ensure seamless connectivity between Google and Outlook calendars and your CRM. ➡️ Why Me? I can easily build your 2-way calendar synchronization engine as I have 5 years of experience in API integrations, backend development, and real-time data synchronization. My expertise includes working with OAuth 2.0, webhooks, and database management. Additionally, I have a strong grip on scalable code design, ensuring your project can handle thousands of users efficiently. ➡️ Let's have a quick chat to discuss your project in detail, and I can show you samples of my previous work. Looking forward to discussing this with you in chat. ➡️ Skills & Experience: ✅ API Integration ✅ OAuth 2.0 ✅ Webhooks ✅ Backend Development ✅ Database Management ✅ Real-Time Updates ✅ Conflict Detection ✅ Scalability ✅ User Authentication ✅ CRM Development ✅ Data Synchronization ✅ Frontend Integration Waiting for your response! Best Regards, Zohaib

@ASirbescu

Hello, Hello! I'm Sirbescu, a seasoned Full-Stack Developer with a specialization in Python and JavaScript. Your project of implementing a native 2-way calendar synchronization engine perfectly aligns with my core expertise. With a solid grasp on OAuth 2.0, I can work directly with the Google Calendar API and Microsoft Graph API for true native integration, removing the need for "middleman" services like Nylas or Make. One of the critical features you require is persistent sync to ensure that users only have to "Allow" once. My vast experience in building robust REST APIs and data-driven systems will enable me to implement this efficiently, guaranteeing seamless synchronization between your CRM and users' calendars. Additionally, incorporating real-time updates using webhooks is right up my alley; this real-time capability only strengthens the sync's effectiveness. In terms of scalability, my focus on clean architecture and performance optimization ensures that even with thousands of concurrent users across different time zones, your system will stay up and running smoothly. To wrap up, I am ready to hit the ground running on your milestones -I'll review your current Base44 setup, define the database schema for token storage and then complete two-way syncs and webhook listeners for both Google and Outlook/Office 365. Building intelligent conflict detection logic that allows synchronization with your AI booking flow is also well wi Thanks!

@Webtechfusion23

Hi, ➡️ I read your job description regarding the need for an expert developer to create a native 2-way calendar synchronization engine for your CRM. This is a crucial component for enhancing user engagement and operational efficiency by maintaining calendar synchronization across platforms. ⏺️ With over a decade of experience in API integrations and scalable systems, I specialize in OAuth 2.0 and have substantial expertise with the Google Calendar API and Microsoft Graph API. My approach ensures secure, persistent sync with real-time updates and conflict detection capabilities, enabling seamless calendar interactions across thousands of devices. Regards, Aftab Ahmad Senior Developer (12 Years of Experience)

@efanntyo

Hi there, I’m Efanntyo, a senior developer with deep expertise in full-stack architecture, OAuth 2.0 integration, and scalable backend systems. I’ve designed and delivered native calendar sync experiences across thousands of users, directly interfacing with Google Calendar API and Microsoft Graph API, without middleware. Your Base44 CRM is a strong foundation for a robust 2-way sync, and I’m confident I can extend it to scale while maintaining 100% real-time accuracy across devices. What I will deliver - Native OAuth 2.0 flows for Google and Outlook with persistent refresh tokens so users single-click connect and never re-authorize. - A scalable token store and per-user sync engine designed for thousands of concurrent subscribers, with secure storage, proper isolation, and efficient lookups. - Two-way calendar synchronization (CRM <-> calendars) using Google Calendar API and MS Graph, including batched updates for performance and rate-limit resilience. - Real-time updates via webhooks/watch subscriptions, with robust retry logic and end-to-end integrity checks. - Conflict detection and time-slot validation integrated with Sarah AI to prevent double-bookings and optimize scheduling around busy times. - Time-zone aware processing, event mapping, and delta reconciliation to minimize drift and ensure consistency across devices. - Extensible architecture: modular services for Google and Outlook, clean DB schema, and clear API contracts to support future features. Why me for thi

@abhisaini0188

Hello, As a seasoned professional with over a decade of experience in API development and software architecture, I have the expertise you need to successfully execute this project. My extensive background in web and mobile application development, particularly with the MEAN/MERN stack, gives me the essential skills to handle all aspects of your base44 CRM sync needs. I can guarantee you a native 2-way calendar synchronization engine that will work directly with Google Calendar API and Microsoft Graph API. This means no middleman "middle-man" services like Nylas or Zapier - just secure, efficient code that handles all the OAuth 2.0 functionality required to maintain complete syncing between your CRM and Google/Outlook calendars. I am confident that my meticulous yet timely approach to development will not only maintain but boost your CRM's efficiency as it grows alongside increasing subscribers. When you hire me, you're hiring more than just a developer; you're investing in an AI-literate professional who will deliver impeccable code for your business-driven solution. With Regards!

@toriquldev123

Hello Dear! I write to introduce myself. I'm Engineer Toriqul Islam. I was born and grew up in Bangladesh. I speak and write in English like native people. I am a B.S.C. Engineer of Computer Science & Engineering. I completed my graduation from Rajshahi University of Engineering & Technology ( RUET). I love to work on Web Design & Development project. Web Design & development: I am a full-stack web developer with more than 10 years of experience. My design Approach is Always Modern and simple, which attracts people towards it. I have built websites for a wide variety of industries. I have worked with a lot of companies and built astonishing websites. All Clients have good reviews about me. Client Satisfaction is my first Priority. Technologies We Use: Custom Websites Development Using ======>Full Stack Development. 1. HTML5 2. CSS3 3. Bootstrap4 4. jQuery 5. JavaScript 6. Angular JS 7. React JS 8. Node JS 9. WordPress 10. PHP 11. Ruby on Rails 12. MYSQL 13. Laravel 14. .Net 15. CodeIgniter 16. React Native 17. SQL / MySQL 18. Mobile app development 19. Python 20. MongoDB What you'll get? • Fully Responsive Website on All Devices • Reusable Components • Quick response • Clean, tested and documented code • Completely met deadlines and requirements • Clear communication You are cordially welcome to discuss your project. Thank You! Best Regards, Toriqul Islam

@AZTURK1

Hi there, I understand you need a native, scalable 2-way Google & Outlook Calendar sync for your Base44 CRM with OAuth2, webhooks, and conflict detection; I’m confident I can build a production-ready engine that scales to thousands of subscribers. - Architecture review and DB schema for secure token storage (refresh tokens encrypted, per-user scopes) - Google Calendar: native OAuth2, refresh token handling, incremental sync, webhook (watch) listener - Microsoft/Office365: MS Graph OAuth2, webhook subscriptions, two-way patch/updates and delta query handling - Conflict detection integrated with Sarah AI (busy-time checks) + scaling plan (queuing, rate-limit handling) Skills: ✅ OAuth ✅ JavaScript, PHP ✅ Database Design & storage encryption ✅ API Development & Webhooks integration ✅ Security, performance & scalability (rate limits, token lifecycle) Certificates: ✅ Microsoft® Certified: MCSA | MCSE | MCT ✅ cPanel® & WHM Certified CWSA-2 I can start with an architecture review and deliver the first milestone within 7 days; final delivery in phases. Do you already have API credentials (Google Cloud project and Azure app registration) and a preferred DB for token storage (MySQL/Postgres)? Best regards,

@FizzaNadeemK

Hi I can build the native two way sync with Google Calendar and Microsoft Graph using OAuth two and real time webhooks. I will review your Base44 setup and design secure token storage with refresh logic for scale. I have delivered calendar sync engines where mobile changes had to reflect instantly in a CRM. One risk is webhook reliability at scale and I will add renewal jobs and backfill sync to prevent drift. The busy time checks will plug into Sarah so bookings never clash across time zones. I can start with architecture and move through Google then Outlook as milestones. Best Regards, Fizza Nadeem K

@Hubready

Hello! I am a US-based full stack developer with extensive experience in building robust systems. I carefully reviewed your project on Google & Outlook Calendar Sync and I’m excited about the opportunity to help you achieve seamless two-way synchronization. With nearly 10 years in the field, I have deep expertise in OAuth 2.0 and have developed similar integrations in the past. For instance, I built a calendar sync tool for a project that streamlined scheduling across platforms and improved team collaboration, enhancing user satisfaction significantly. To ensure I meet your needs effectively, could you please clarify the following questions? 1. Are there specific features or functionalities you want to prioritize for the calendar sync? 2. Do you have any design preferences or existing systems that this sync needs to integrate with? My approach would involve understanding your requirements in detail, developing a clear project plan with structured milestones, and ensuring a smooth deployment. I believe in delivering production-ready code that’s maintainable and scalable. Looking forward to the possibility of working together to make this project a success! -James Zappi

@juanjosec63

Hello, I’m excited about the opportunity to contribute to your native 2-way Google and Outlook calendar sync engine for Base44 and deliver a backend that scales to thousands of subscribers. With my expertise in OAuth 2.0, Google Calendar API, Microsoft Graph, and production-grade sync architectures, I can implement persistent refresh-token storage, real-time webhook/watch handling, and robust 2-way reconciliation so the CRM and users’ mobile calendars stay truly in sync. I’ll tailor the solution to your current Base44 setup by defining a clean token and state schema, building idempotent sync jobs with rate-limit awareness and timezone-safe event normalization, and adding conflict detection that checks busy windows before Sarah AI books anything. You can expect clear communication, fast turnaround, and a high-quality implementation that fits seamlessly into your existing workflow without relying on middleman services. Best regards, Juan

@ivaylo8

Hello, I understand that you are seeking an experienced developer to create a robust 2-way sync engine for Google and Outlook calendars tailored to your Base44 CRM. With the solutions you’ve initiated already in place, I can ensure a seamless backend logic implementation that will elevate user experience and efficiency. My approach will focus on utilizing native OAuth 2.0 for direct integration with the Google Calendar API and Microsoft Graph API, eliminating reliance on third-party services. I will develop a reliable Persistent Sync mechanism with Refresh Token logic, ensuring a smooth and single-click connection for users. The real-time notification system through Webhooks will guarantee that any changes in the calendars are reflected instantly in your CRM. Additionally, I will build conflict detection logic to safeguard the user’s scheduling preferences, allowing your AI assistant to operate optimally. I am highly skilled in backend development, API integration, and database design, equipped to design a scalable solution suited for thousands of users across various time zones. Looking forward to the opportunity to collaborate! Best regards, Ivaylo

@codefusion53

Hi I can build a native two way Google and Outlook calendar sync engine with OAuth 2.0, refresh token persistence, webhook driven updates, and conflict detection that scales to thousands of users. I have implemented direct integrations with Google Calendar API and Microsoft Graph, including token rotation, delta sync patterns, and reliable webhook processing. I would start with an architecture review of your current Base44 CRM and define a secure database schema for token storage, calendar mappings, and event correlation IDs. Then I will implement two way sync with idempotent upserts, time zone safe date handling, and rate limit aware backoff. Webhooks will be handled through a hardened listener with signature validation, queue based processing, and automatic watcher renewal. For Outlook, I will use Graph change notifications and delta queries for efficient sync at scale. Finally, I will implement conflict logic so Sarah checks busy times and prevents double booking, using free busy endpoints or cached availability windows for performance. Best, Justin

@NadiaCrea8weB

Hello, I’ve read your Google & Outlook Calendar Sync Development brief and I’m confident I can deliver a native, scalable two-way sync for thousands of Base44 CRM subscribers with true OAuth 2.0 flow and real-time Webhooks. I will architect a lean backend to store tokens securely, implement refresh logic, and integrate Google Calendar and Microsoft Graph APIs directly, ensuring 100% mobile sync and conflict-aware AI booking with Sarah.

@maximg10

⭐Hi, I’m ready to assist you right away!⭐ I believe I’d be a great fit for your project since I have extensive experience in developing native 2-way calendar synchronization engines. With a keen focus on timelines and budget, I am confident in delivering efficient and scalable solutions.

@ssquare489

I am Sumit Joshi from Sacesta Technologies. I can build a native, scalable two-way Google and Outlook calendar sync for your Base44 CRM with OAuth, refresh tokens, webhooks, and conflict checks tied into Sarah AI booking. I have a few questions for the project • What database do you use in Base44 today and where should encrypted token storage live? • Do you need sync for multiple calendars per user or only the primary calendar? • Should CRM-created events be editable on the calendar side, and how should deletes be handled? • What is your current booking model for Sarah AI: event holds, confirmed events, or both? Why work with me • I build API-first Node.js systems with reliable webhooks, retries, idempotency, and audit logs • Direct Google Calendar API and Microsoft Graph integration without middleware tools • Busy-time and conflict detection using freebusy and Graph availability patterns • Scale design for thousands of users across time zones with queueing and backoff Related work • Multi-tenant SaaS platforms with role access, webhooks, and real-time workflows • CRM automation systems with strict data consistency and logging Please message me on Freelancer and I will review your current Base44 setup, propose the token schema, and start with the architecture milestone and Google sync first. Regards, Sumit Joshi

@SEOGlobalLLC

Hi there, You need a native 2-way Google and Outlook calendar sync engine using OAuth 2.0 with refresh tokens, real-time webhook listeners, conflict detection against busy slots, and scalable architecture integrated into your Base44 CRM and Sarah AI booking flow. SEO Global Team has extensive experience building high-scale API integrations with Google Calendar API and Microsoft Graph, implementing secure OAuth token storage, webhook processing, and distributed systems handling thousands of concurrent users across time zones. We would design a robust token schema with encrypted refresh storage, event mapping with external IDs, webhook receivers with background workers, idempotent sync logic, and intelligent conflict validation tightly connected to Sarah’s booking engine for real-time availability enforcement. Is Base44 Node or Python based on the backend? Do you already have webhook endpoints provisioned and publicly accessible? Will this be deployed on a single server or distributed environment? Looking forward to collaborating on this.

@amitvjain

Hello, This is a true sync-engine project—not just an API hookup—and I have experience building production-grade, native integrations with Google Calendar API and Microsoft Graph (no middleware). I will implement: • Native OAuth 2.0 with secure refresh token storage (users authorize once) • Full 2-way sync (create/update/delete) • Incremental sync + delta queries for performance • Webhooks (watch/subscriptions) with auto-renewal • Idempotent webhook processing to prevent duplicates • Conflict detection engine to check busy times before Sarah AI books • Timezone normalization & recurring event handling For scalability (thousands of users): * Queue-based async processing * Rate-limit handling + retries * Encrypted token storage * Horizontal scaling readiness Milestones: 1. Architecture review + DB schema for tokens & sync metadata 2. Google 2-way sync + webhook listener 3. Outlook 2-way sync via MS Graph 4. Conflict logic integrated into AI booking flow I focus on clean architecture, reliability, and long-term maintainability. Happy to review your Base44 setup and propose the optimal sync design.

@NaveenSingh09

Hello, With over four years of full‑stack Python experience, I can deliver a robust 2‑way sync engine for Base44. I will start by reviewing the current architecture and designing a secure token schema that stores OAuth credentials and refresh tokens. Next, I will implement direct Google Calendar API integration, handling authentication, event polling, and webhook listeners for instant updates. Then I’ll add Microsoft Graph support, mirroring the same flow for Outlook calendars. Conflict detection will be built into the sync logic, checking user availability before creating new events. Throughout, I’ll use Celery workers and Docker containers to ensure the system scales to thousands of users across time zones. I’ll provide clear documentation and a test suite, and I’ll keep you informed with weekly progress reports. Let’s build a seamless calendar experience that keeps your CRM and mobile devices in perfect sync. Best Regards Naveen Thakur