What is FrontendCheck?

FrontendCheck is a frontend learning platform that teaches enterprise architecture patterns through domain-adaptive challenges. Instead of building another todo app, you choose your domain (cat fashion store, meditation app, etc.) and learn the same professional patterns while building something unique.

How is FrontendCheck different from Frontend Mentor?

Frontend Mentor focuses on pixel-perfect implementation of provided designs. FrontendCheck focuses on architecture and system design, teaching patterns like multi-tenancy, permissions, and real-time collaboration while letting you bring your own creative ideas.

Is FrontendCheck free?

The SaaS Pivot Challenge is completely free - 10 self-paced stakeholder emails teaching multi-tenant architecture, role-based permissions, dynamic theming, and internationalization. Additional challenges are $39 each.

What technologies does FrontendCheck teach?

FrontendCheck teaches enterprise frontend patterns including multi-tenant data architecture, role-based access control (RBAC), dynamic theming, internationalization (i18n), real-time collaboration with WebSockets, offline-first PWA development, and e-commerce patterns.

Who is FrontendCheck for?

FrontendCheck is designed for junior to mid-level frontend developers preparing for senior roles, bootcamp graduates bridging the gap to employment, freelancers wanting to build SaaS products, and anyone tired of building generic todo app tutorials.

Build your unique SaaS in 10 days

Cat fashion stores. Ex-tracking CRMs. Plant care apps. Pick your own unique idea, and we'll teach you the enterprise architecture to make it real. We handle the backend — you focus on the frontend.

See How It Works

bandpractice.app

🎸

Band Practice Portal

🎤 The Procrastinators

Tonight's Setlist

Smells Like Teen Spirit✓

Enter Sandman🔄

Back in Black❌

🎸

Jake

🥁

Sam

🎤

Alex

🎹

Chris

meowdrobe.app

🐱

Meowdrobe

New Collection: Summer Whiskers

Lightweight looks for the hottest days

🐱

Bestsellers

View All →

Bat Sweater

$34

Knitted Santa Hat

$18

Plaid Shirt

$42

extracker3000.io

💔

Ex Tracker3000

Total Exes

High Threat

89%

Over Them

Jake from State Farm

Last seen: Your favorite bar · 2 days ago

High

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Last seen: LinkedIn · 1 week ago

Medium

Summer Camp Steve

Last seen: Moved to Alaska · 3 years ago

Low

You've built 32 todo apps. Your portfolio looks like everyone else's. It's time to build something actually interesting — with the same architecture that powers production apps you use every day.

How it works

From unique idea to deployed SaaS in 10 days.
Here's the journey.

We simulate the backend for you

Learning complex frontend patterns is hard without a real API. Each challenge comes with a fully simulated backend — you focus 100% on the frontend.

Select challenge

Browse our curated collection of challenges, each designed to teach different architectural patterns. From multi-tenancy and permissions to real-time collaboration and e-commerce scale.

Multi-tenancyPermissionsThemingReal-time synci18nPerformance

Pick your domain

Building an inventory system? A CRM? A notes app? Pick your domain and the challenge adapts — same architecture patterns, but all the terminology, examples, and API data match YOUR app idea.

Tasks

CRM

Notes

Shop

Name it something unique

ChoreQuest. Meowdrobe. Fridge Forensics. Your domain + your name = a portfolio piece that's actually yours, not another generic tutorial clone.

Task Manager

→ "ChoreQuest" (gamified chores)

CRM

→ "Meowdrobe" (cat fashion store)

Navigate the chaos

Stakeholder emails drop daily with real pivots. "We need multi-tenancy." "Permissions changed." Just like work.

Marco Caceres (Product Manager)

URGENT: Requirements changed again...

Daniel Torres (Lead Engineer)

We need multi-tenant by Friday

Cecilia Lin (Backend Engineer)

API changes — heads up

Build real architecture

Multi-tenancy. Role-based permissions. Dynamic theming. i18n. The patterns that power real SaaS.

const tenant = useTenant();

const { can } = usePermissions();

const theme = useTheme();

const { t } = useTranslation();

if (can('plants:edit')) {

updatePlant(tenant.id, data);

}

Deploy it

Day 10: your unique app is live. Add a real database when you're ready to launch for real.

Live

5 architecture
challenges

Each challenge teaches a different enterprise pattern. Build something unique with each one.

Challenge 01Free

The SaaS Pivot Challenge

Build a multi-tenant SaaS from scratch. Learn the architecture patterns that power Notion, Linear, and every serious SaaS product.

Multi-tenancyPermissionsDynamic Theming

Challenge 02$39

The E-commerce Scale Challenge

Build a store that handles carts, inventory race conditions, complex pricing, and checkout flows that don't break under load.

Cart ArchitectureInventory SyncPricing Rules

Challenge 03$39

The Real-time Collaboration Challenge

Build multiplayer features with WebSockets, presence indicators, conflict resolution, and offline-first architecture.

WebSocketsCRDTsPresence

See All Challenges

Simple pricing.
No subscriptions.

Start with the free challenge. Buy more when you're ready. Each challenge is yours forever.

First Challenge

Free

Forever. No catch.

Each Challenge After

$39

Lifetime access

Build something unique.
Learn something real.

Same enterprise patterns as production apps you use every day. Your unique, hilarious app.

View Challenges