WHO THIS IS FORCurious beginners, students and aspiring developers
01EVERYDAY APPS · INVISIBLE SYSTEMS
How Everyday Apps Work
Build system-design intuition by tracing what happens after you tap Send, Pay, Track, Play or Navigate in apps you already use every day.
Connected learning pathBeginner-friendlyReal project scenarios
Start with Byte 01 SendPayTrackPlayNavigate
HANDBOOK OVERVIEW
See the whole system.
Then master each decision.
This is a connected learning path—not a collection of isolated tips. Every Byte builds the mental model, makes the workflow visible and applies it to a situation you could meet in a real project.
Designed for practical understandingFinish ready to recognise, apply and explain the concept.
STARTING POINTNo coding or system-design background required
02WHAT YOU WILL BUILDA tap → service journey → system decision → user outcome mental model
03THE MAANAVAN LEARNING METHODOne clear progression in every Byte
Move from first understanding to confident explanation.
UNDERSTANDBuild the mental modelStart with plain language and a familiar analogy.VISUALISEFollow the workflowSee how each component connects and why it matters.APPLYEnter a real scenarioUse the concept in a practical project situation.EXPLAINMake the decision clearFinish with mistakes, takeaways and an interview answer.
CONNECTED LEARNING PATH
Learn in the order the work happens.
Complete one focused concept at a time. Every chapter includes practical guidance you can use immediately.
START5 guided BytesPRACTICAL OUTCOME
CHAPTER 01 · Everyday App Systems
beginner · 22 minWhat Happens When You Send a WhatsApp Message?
Follow a WhatsApp message from your phone through routing, delivery, offline queues and status acknowledgements.
CHAPTER 02 · Everyday App Systems
beginner · 23 minWhat Happens When You Complete a UPI Payment?
Trace a UPI payment across the app, NPCI and two banks—and understand pending, failed and reversed transactions.
CHAPTER 03 · Everyday App Systems
beginner · 24 minHow Does Live Food-Delivery Tracking Work?
See how rider GPS updates travel through real-time services and reach the moving map on your phone.
CHAPTER 04 · Everyday App Systems
beginner · 23 minHow Does Netflix Stream Without Constant Buffering?
Understand video renditions, short chunks, CDNs, buffers and adaptive bitrate decisions during playback.
CHAPTER 05 · Everyday App Systems
beginner · 24 minHow Does Google Maps Find and Update Your Route?
Follow route selection and live rerouting through road graphs, historical patterns, current traffic and ETA prediction.