PrepPal: Engineering Gym
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About this app
Your AI agent writes the code. Do you understand the trade-offs?
PrepPal is the daily gym for software engineers who refuse to let their skills atrophy.
In just 5 minutes a day, you train the architectural intuition that separates feature builders from system designers.
THE PROBLEM YOU ALREADY FEEL
You ship features. You rely on modern tooling.
But when production breaks at 3 AM, can you explain what the system is actually doing?
When someone asks:
Why WebSockets instead of polling?
Do you answer with confidence, or freeze?
This is skill atrophy.
And it accelerates when AI makes more decisions for you.
WHY PREPPAL EXISTS
PrepPal was built for experienced software engineers (2-6 years) who are:
• Worried about becoming AI wrapper engineers
• Stuck shipping features without architectural ownership
• Too busy for long system design books
• Burned out on video courses and passive learning
PrepPal uses active recall, not passive consumption.
HOW IT WORKS
Every day you get 5 minutes of scenario-based drills, such as:
• Your API hits 10k concurrent connections and crashes. What failed?
• Rank caching strategies by latency impact
• This distributed transaction will break. Tap the failure point
No syntax quizzes.
Just engineering judgment under pressure.
THE 3-PHASE DEPTH MODEL
Each module (Authentication, Caching, Performance, and more) goes deep:
Phase 1 - Fundamentals (Free)
Learn the vocabulary and core concepts.
Phase 2 - Internals (Free)
Understand how systems work under the hood and why they fail.
Phase 3 - Architecture (Pro)
Make real trade-offs across scale, cost, reliability, and latency.
GAMIFIED, BUT NOT CHILDISH
You earn XP.
You unlock modules.
You maintain streaks.
This is not entertainment.
The drills are hard. The scenarios are real.
If you answer incorrectly, we explain which mental model failed and why.
WHO PREPPAL IS FOR
Software engineers who:
• Write production code daily
• Want confidence in system design discussions
• Need to practice trade-offs like CAP, consistency, and scaling
• Aspire to Staff or Principal roles
WHO IT IS NOT FOR
• Beginners learning to code
• Syntax-only practice
• Casual or “easy” learning apps
PREPPAL PRO - UNLOCK PHASE 3
Free includes Phases 1 and 2 across all modules.
Upgrade to Pro for:
• Architecture and system design scenarios
• AI-powered weak spot detection
• Targeted drills for stale or unstable skills
• Unlimited daily practice
START DAILY MAINTENANCE
Download PrepPal.
Pick your stack.
Complete your first drill.
Five minutes is enough when you train the right things.
Skills do not disappear overnight.
They decay quietly.
PrepPal fights back.
PrepPal is the daily gym for software engineers who refuse to let their skills atrophy.
In just 5 minutes a day, you train the architectural intuition that separates feature builders from system designers.
THE PROBLEM YOU ALREADY FEEL
You ship features. You rely on modern tooling.
But when production breaks at 3 AM, can you explain what the system is actually doing?
When someone asks:
Why WebSockets instead of polling?
Do you answer with confidence, or freeze?
This is skill atrophy.
And it accelerates when AI makes more decisions for you.
WHY PREPPAL EXISTS
PrepPal was built for experienced software engineers (2-6 years) who are:
• Worried about becoming AI wrapper engineers
• Stuck shipping features without architectural ownership
• Too busy for long system design books
• Burned out on video courses and passive learning
PrepPal uses active recall, not passive consumption.
HOW IT WORKS
Every day you get 5 minutes of scenario-based drills, such as:
• Your API hits 10k concurrent connections and crashes. What failed?
• Rank caching strategies by latency impact
• This distributed transaction will break. Tap the failure point
No syntax quizzes.
Just engineering judgment under pressure.
THE 3-PHASE DEPTH MODEL
Each module (Authentication, Caching, Performance, and more) goes deep:
Phase 1 - Fundamentals (Free)
Learn the vocabulary and core concepts.
Phase 2 - Internals (Free)
Understand how systems work under the hood and why they fail.
Phase 3 - Architecture (Pro)
Make real trade-offs across scale, cost, reliability, and latency.
GAMIFIED, BUT NOT CHILDISH
You earn XP.
You unlock modules.
You maintain streaks.
This is not entertainment.
The drills are hard. The scenarios are real.
If you answer incorrectly, we explain which mental model failed and why.
WHO PREPPAL IS FOR
Software engineers who:
• Write production code daily
• Want confidence in system design discussions
• Need to practice trade-offs like CAP, consistency, and scaling
• Aspire to Staff or Principal roles
WHO IT IS NOT FOR
• Beginners learning to code
• Syntax-only practice
• Casual or “easy” learning apps
PREPPAL PRO - UNLOCK PHASE 3
Free includes Phases 1 and 2 across all modules.
Upgrade to Pro for:
• Architecture and system design scenarios
• AI-powered weak spot detection
• Targeted drills for stale or unstable skills
• Unlimited daily practice
START DAILY MAINTENANCE
Download PrepPal.
Pick your stack.
Complete your first drill.
Five minutes is enough when you train the right things.
Skills do not disappear overnight.
They decay quietly.
PrepPal fights back.
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What’s new
Onboarding bug fixes
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About the developer
שרון מישייב
info.preppal@gmail.com
הראה 73
רמת גן, 5240133
Israel