Cairo Airport App

Cairo International Airport App is an application aimed at providing flight schedules to different countries with the ability to book tickets at discounted prices and take advantage of offers.
Fazkrony App

Fazkrony App is an application aimed at easy access to morning and evening supplications and all the essential supplications that Muslims need in their daily lives. It also allows users to perform daily tasbeeh easily.
Hajj Guide App

Hajj Guide App is an application aimed at understanding the rituals of Hajj and Umrah with simplified audio and visual explanations. It also helps you access most of the Kingdom’s services and everything you need during the Hajj and Umrah period, in addition to other services like prayer times and a compass.
Hassan App

Hassan App is an application aimed at making it easier to find technicians in various fields to fix any malfunction at home or work with the ability to track the technician and repair steps at the best competitive prices. You can also schedule and determine the appropriate times for the maintenance tasks to be carried out.
Enaba App

Enaba App is an application dedicated to performing Umrah on behalf of others. The app is designed for those who cannot perform the Umrah ritual for their deceased relatives, and it provides verified individuals to perform Umrah on their behalf at a nominal cost. The app also allows tracking the pilgrim on the map for reassurance.

Tuesday,10 Mar 2026

Secrets to programming synchronous collaboration features (like Google Docs) within your application

Open Communication Channel: Unleashing the Power of WebSockets and gRPC

At Grand, we know that traditional protocols (HTTP) are unsuitable for collaborative work because they rely on a "request-return" system, which causes latency. The secret lies in using Full-Duplex Communication via WebSockets. We establish a continuous, open data "tunnel" between the mobile device and the server, allowing any changes made by the first user (like deleting a word or changing a color) to be sent to the server in milliseconds. In the massive systems of 2026, we also use gRPC Streams because they rely on binary data, resulting in very small message sizes and incredibly fast transmission. This ensures that your colleague's cursor moves seamlessly in front of you, as if they were sitting right next to you on the same device.

The Conflict Problem: The Genius of CRDTs and OT Algorithms

The biggest engineering challenge arises when two programmers edit the same line of text simultaneously. If the system isn't intelligent, one edit will override the other. In Grand, we utilize Conflict-free Replicated Data Types (CRDTs). The idea is to assign each character or element in the application a unique ID and a very precise time stamp. When data arrives at the server from multiple users, the algorithm can intelligently merge these edits without needing a central server to determine the correct one. The second alternative is Operational Transformation (OT), the same technology used in Google Docs. OT recalculates the position of each character based on previous operations, ensuring that the final text appears identical for everyone, regardless of their internet speed.

3. Real-Time Feedback (Optimistic UI & State Sync)
For the user to feel that the application is "on the fly," they shouldn't have to wait for the server's response to see what they typed. We program what's called Optimistic UI Update; this means the application displays the change immediately on the user's screen, "assuming" the server will approve it, while the process happens in the background. The challenge here is in managing "shared state" (Shared State Management). We use advanced libraries that perform partial synchronization; meaning if a file is large, we don't send the entire file every time, we only send the "delta" or the change that occurred. This reduces internet bandwidth consumption and makes the application very stable, even with a weak signal, because the amount of data exchanged is very small.

4. Server Architecture and Scalability (Scalable Pub/Sub Infrastructure)
When you have thousands of users working in groups, the server can become overwhelmed by the volume of messages. At Grand, we're building an infrastructure based on a Pub/Subscriber (Publisher/Subscriber) system using tools like Redis or Apache Kafka. The server acts as a "smart distributor," taking the edit from one user and "publishing" it only to users who have the same file open at that moment. We also use Horizontal Scaling, so if the load increases, we distribute users across dozens of servers that communicate with each other in the background at lightning speed. Controlling latency and securing end-to-end encryption during transmission is what differentiates a hobbyist application from the professional platform Grand is building for the future.