Author & Publications

Books & Publications

Technical engineering playbooks, system design blueprints, and children's book series by Rohail Ahmad.

🎨 Children's Series Ages 1 · 2 · 3 Amazon Paperbacks

"Little hands first coloring book" Series

Gentle, screen-free coloring books designed for tiny hands. Each book features extra-bold lines to help toddlers stay inside shapes, single-sided pages with no distractions, and names underneath every illustration for early vocabulary and first words.

My Little Hands Coloring Book Cover by Rohail Ahmad
Series · Book 1 Ages 1 · 2 · 3 Amazon Paperback 42 Big Illustrations

My Little Hands Coloring Book

Book 1 · Hours of Happy Coloring & First Words for Toddlers

A gentle first coloring book made just for little hands. Every page features one big, simple picture with thick, extra-bold outlines—easy for tiny fingers to color without distractions. Say the words underneath together to build vocabulary and fine-motor confidence.

🖍️ Extra-Bold Lines 🗣️ Learn First Words 📖 One Picture Per Page 🐱 Friendly Animals 🍎 Yummy Food
View Book Details & Sample Pages Buy on Amazon
Things That GO! Coloring Book Cover by Rohail Ahmad
Series · Book 2 Ages 1 · 2 · 3 Amazon Paperback 40 Big Vehicles

Things That GO! — My Little Hands

Book 2 · Vroom into Coloring & First Words for Toddlers

A first coloring book for little ones who love things that go! Every page has one big vehicle with a thick, bold outline—easy for tiny fingers to color—and its name underneath, so coloring time turns into first-words time. 40 cars, trucks, diggers, trains & planes.

🖍️ Extra-Bold Lines 🗣️ Learn First Words 🚜 40 Vehicles 🚒 Fire Trucks & Diggers ✈️ Planes & Boats
View Book Details & Sample Pages Buy on Amazon
Technical Playbooks & Guides
Cracking the Android FAANG Interview Cover
Available on Gumroad Architecture & System Design FAANG Vault

Cracking the Android FAANG Interview

Modern Architecture • Jetpack Compose • FAANG Vault

The definitive insider masterclass on Android system design, Jetpack Compose internals, Kotlin Coroutines pitfalls, and curated live coding challenges asked at top tech companies.

Kotlin Jetpack Compose System Design Concurrency Live Coding Vault
View Book Details & Chapters Buy on Gumroad
Back to all books
Cracking the Android FAANG Interview Cover
Published & Ready Gumroad Edition Architecture & FAANG Vault Instant Download

Cracking the Android FAANG Interview

Modern Architecture • Jetpack Compose • FAANG Vault

Distilled from 8+ years of engineering experience and rigorous interviews across top-tier tech companies. This comprehensive guide equips senior and staff Android engineers with battle-tested system design blueprints, Jetpack Compose performance internals, concurrency pitfalls, and high-frequency FAANG interview questions.

FAANG Android System Design frameworks
Jetpack Compose recomposition & internals
Coroutines, Flow & threading traps
Curated FAANG live coding questions & solutions
Buy on Gumroad — Instant Access View Curriculum
Curriculum & FAANG Vault

What's Inside The Book

Structured around real interview evaluation rubrics used by Meta, Google, Amazon, Uber, and Netflix.

Part 01

Mobile System Design & Architecture Rounds

End-to-end blueprints for designing Instagram Feed, WhatsApp Messaging, Uber Driver Tracking, and Netflix Offline Video Download on Android.

System Design API Pagination Data Layer Caching
Part 02

Jetpack Compose Internals & UI Architecture

Deep-dive into Slot API design, Snapshot state system, side-effects (LaunchedEffect, rememberCoroutineScope), and debugging unstable recomposition.

Jetpack Compose Stability & Metrics Custom Layouts
Part 03

Concurrency, Coroutines & Memory Mastery

Structured concurrency, CoroutineScope lifecycle bindings, Flow backpressure operators, race condition mitigation, and LeakCanary memory profiling.

Kotlin Flow Thread Safety Memory Profiling
Part 04

The FAANG Live Coding Vault

Common live coding challenges: custom thread-safe LRU cache, diff algorithms, reactive search autocomplete, and asynchronous task coordinators.

Live Coding LRU Cache Data Structures
Part 05

Offline-First, Network Resilience & Security

Room DB encryption with SQLCipher, WorkManager resilient sync heuristics, certificate pinning, biometric cryptography, and battery efficiency.

WorkManager Biometrics Cert Pinning
Part 06

Staff Level Leadership & Behavioral Frameworks

Navigating cross-functional conflict, technical design reviews (RFCs), mentorship metrics, and answering STAR behavioral questions like a Lead.

STAR Method Tech Lead Craft RFC Reviews
Target Audience

Who Is This Book Built For?

Engineers preparing for Senior, Lead, or Staff Android interviews who want to pass with confidence.

Senior Android Engineers

Ace complex system design and live coding rounds. Learn what FAANG interviewers specifically look for in high-signal answers.

Tech Leads & Architects

Demonstrate architectural maturity, cross-module dependency management, build optimization, and scalable technical vision.

Modern Native Developers

Gain deep conceptual clarity across declarative UI, unidirectional data flows, memory leak diagnostics, and production telemetry.

Instant Access via Gumroad

Ready to Land Your Dream Android Role?

Get immediate access to the full book, code templates, architecture diagrams, and the FAANG interview vault.

Get the Book on Gumroad
Questions

Frequently Asked Questions

Everything you need to know about purchasing, formats, and updates.

How do I access the book after purchasing on Gumroad?
Immediately after checkout on Gumroad, you will receive instant download links to the PDF version and companion resources, as well as an email receipt with lifetime access to all future revisions.
Does this book cover both System Design and Coding rounds?
Yes! The book is comprehensively divided into Mobile System Design architectures, Jetpack Compose deep-dives, Kotlin Concurrency pitfalls, and hands-on live coding algorithms commonly asked in FAANG interviews.
Will I receive future updates and errata?
Yes. All future updates, added interview questions, and revisions are delivered free of charge directly through your Gumroad library.
My Little Hands Coloring Book Cover by Rohail Ahmad
Little Hands First Coloring Book · Book 1 Ages 1 · 2 · 3 Amazon Paperback Prime Delivery

My Little Hands Coloring Book

Book 1 · Hours of Happy Coloring & First Words for Toddlers

A gentle first coloring book made just for little hands. Every page has one big, simple picture with a thick, bold outline — easy for tiny fingers to color and impossible to get lost in. Say the word underneath together, and coloring time becomes first-words time!

42 familiar pictures: friendly animals, yummy food, things that go & everyday objects
Extra-bold lines that help toddlers stay inside the shape
One picture per page — no clutter, no distractions
Builds vocabulary, color recognition & fine-motor skills
Order on Amazon Explore Book 2: Things That GO! →
Things That GO! Coloring Book Cover
Next in the Series · Book 2

Things That GO! — My Little Hands

Love vehicles? Explore Book 2 with 40 big cars, trucks, diggers, fire engines, trains, planes and rockets for vehicle-mad toddlers.

View Book 2
Look Inside & Cover Spread

Created for Joy, Discovery & First Words

Designed with love to give young children a calming, screen-free creative adventure.

My Little Hands Coloring Book Full Cover Spread with Front, Back and Featured Illustrations
✏️ Extra-bold lines 🗣️ Learn first words 📖 One picture per page 👶 Perfect for toddlers ages 1, 2 & 3
Why Toddlers & Parents Love It

What Makes This Coloring Book Special

Thoughtfully engineered page-by-page to maximize fun and early childhood learning.

Feature 01

42 Big & Familiar Toddler Pictures

Featuring beloved friendly animals (kittens, fish, ducks, butterflies), delicious foods (apples, snacks), vehicles, sun, flowers, balloons and everyday items toddlers recognize immediately.

Animals Food Everyday Life
Feature 02

Thick, Extra-Bold Outlines

Extra-wide black borders help little hands stay inside shapes easily, giving toddlers a sense of accomplishment and boosting their motor-control confidence.

Tantrum-Free Confidence Boost Motor Skills
Feature 03

First Words & Speech Development

Each illustration includes a bold word label underneath. Parents and caregivers can read and point aloud, turning fun coloring sessions into interactive language practice.

Early Vocabulary Speech Milestones Bonding Time
Feature 04

One Picture Per Page — Zero Clutter

Single-sided printing prevents marker bleed-through and eliminates confusing backgrounds so young toddlers can focus entirely on the subject without distractions.

No Bleed-Through Single Sided Zero Visual Noise
Feature 05

Screen-Free Creative Calm

The ideal healthy alternative to tablets and phones. Perfect for quiet playtime at home, cozy afternoons, restaurant entertainment, and traveling.

Screen-Free Mindful Play Travel Friendly
Feature 06

The Perfect Gift for 1–3 Year Olds

A wonderful present for first birthdays, toddler holidays, baby showers, preschool classrooms, and daycare starter packs.

Birthday Gift Holiday Present Preschool
Book Specifications

Publication & Format Details

Series Little Hands First Coloring Book (Book 1)
Author Rohail Ahmad
Target Age Group Ages 1, 2 & 3 (Toddlers & Preschool)
Format High Quality Paperback
Illustration Count 42 Big & Simple Pictures
Distribution Worldwide via Amazon
Prime Delivery via Amazon

Give Your Toddler Hours of Joyful Coloring

Order Book 1 today and start creating unforgettable first-words and coloring memories together.

Buy Book 1 on Amazon — Fast Delivery
Parent FAQs

Frequently Asked Questions

Helpful info for parents, teachers, and gift buyers.

What age range is this book best suited for?
The book is crafted specifically for toddlers aged 1 to 3 years old. The extra-thick outlines and clean single illustrations are easy for small hands to grasp and color with confidence.
What coloring materials work best with this book?
Jumbo triangular crayons, washable toddler markers, dot markers, and chunky colored pencils all work wonderfully! Because each illustration is on its own page, you can easily color with markers without ruining the next page.
How can I order and how fast is delivery?
You can order directly on Amazon via mybook.to/MyLittleHands. The link automatically opens your regional Amazon store with Amazon Prime delivery options.
Things That GO! Coloring Book Cover by Rohail Ahmad
Little Hands First Coloring Book · Book 2 Ages 1 · 2 · 3 Amazon Paperback 40 Big Vehicles

Things That GO! — My Little Hands

Book 2 · Vroom into Coloring & First Words for Toddlers

A first coloring book for little ones who love things that go! Every page has one big vehicle with a thick, bold outline — easy for tiny fingers to color — and its name underneath, so coloring time turns into first-words time. Packed with 40 favorite vehicles from fire trucks to rockets.

40 favorite vehicles: cars, trucks, diggers, fire trucks, trains, boats, planes, rockets & more
Extra-bold lines that help toddlers stay inside the shape
One vehicle per page — no clutter, no distractions
Builds vocabulary, color recognition & fine-motor skills
Order on Amazon ← View Book 1 in Series
My Little Hands Coloring Book Cover
Part of Series · Book 1

My Little Hands Coloring Book

Start the series with Book 1! 42 familiar pictures of friendly animals, yummy food, and everyday objects with extra-bold lines.

View Book 1
Look Inside & Cover Spread

Vroom Into Coloring & First Words

Perfect for vehicle-mad toddlers who love cars, construction trucks, trains, planes and rockets.

Things That GO! Coloring Book Full Cover Spread with Front and Back Cover
✏️ Extra-bold lines 🗣️ First words 🚜 40 vehicles 👶 Perfect for toddlers ages 1, 2 & 3
Vehicle Categories Inside

40 Favorite Vehicles to Color & Learn

Carefully selected to spark excitement, build vocabulary, and encourage imaginative play.

Category 01

Cars, Taxis & City Cruisers

Classic cars, city taxis, delivery vans, and everyday vehicles that toddlers see when out on walks with mom and dad.

Cars Taxis City Life
Category 02

Fire Trucks, Police & Rescuers

Big fire engines with rescue ladders, hospital ambulances, and hero emergency vehicles with bold siren outlines.

Fire Trucks Emergency Heroes
Category 03

Diggers, Dump Trucks & Bulldozers

Heavy machinery loved by toddlers! Excavators scooping dirt, dump trucks tipping rocks, bulldozers and farm tractors.

Excavators Tractors Construction
Category 04

Trains, Tracks & Locomotives

Steam engines, freight cars, high-speed passenger trains, and cabooses riding along clickety-clack railway lines.

Choo Choo Railroads Engines
Category 05

Planes, Helicopters & Space Rockets

Airplanes gliding through clouds, whirly-bird helicopters with big rotors, and tall space rockets blasting off to the stars.

Airplanes Helicopters Rockets
Category 06

Boats, Ships & Ocean Sailing

Breezy sailboats, sturdy tugboats, ferry boats and majestic ships sailing across calm blue waters.

Sailboats Tugboats Water Life
Book Specifications

Publication & Format Details

Series Little Hands First Coloring Book (Book 2)
Author Rohail Ahmad
Target Age Group Ages 1, 2 & 3 (Toddlers & Preschool)
Format High Quality Paperback
Vehicle Count 40 Favorite Vehicles
Distribution Worldwide via Amazon
Prime Delivery via Amazon

Give Your Little Vehicle Fan Hours of Joy

Order Book 2 on Amazon today and enjoy hours of creative coloring and first-words fun together.

Buy Book 2 on Amazon — Fast Delivery
Parent FAQs

Frequently Asked Questions

Helpful info for parents, teachers, and gift buyers.

How does Book 2 fit with Book 1 in the series?
Both books are part of the "Little hands first coloring book" series! Book 1 introduces 42 general first words and familiar objects (animals, food, home items), while Book 2 focuses specifically on 40 exciting vehicles that toddlers love (cars, diggers, fire trucks, planes, and boats). Both share the same toddler-tested extra-bold outlines and single-sided layout.
Are pages printed on both sides or single-sided?
Every single illustration is printed on its own separate page (one picture per page). This completely prevents bleed-through from markers, dot pens, or crayons onto the next drawing.
Where can I buy the book?
The book is available worldwide on Amazon via Amazon.com/dp/B0HJVW4Q3Y with fast Prime delivery options in your region.