Build the mental model in order.
Each path progresses through different products so the pattern stays connected to its domain constraints.
Backend Foundations
Transactions, APIs, data models, and practical background work.
E-commerce Platform
Catalog, inventory, checkout, fulfillment, and returns without overselling.
Appointment SaaS
Multi-tenant scheduling with availability rules, holds, reminders, and calendar sync.
Project Management Platform
Tenant-safe projects, tasks, comments, permissions, activity, and collaborative updates.
Distributed Systems
Retries, ownership, asynchronous convergence, and failure recovery.
Payment Platform
Safely orchestrate provider payments, idempotency, ledger entries, webhooks, and reconciliation.
Ride Hailing Platform
Match riders and drivers under location churn and acceptance races.
Video Streaming Platform
Ingest, transcode, package, authorize, and deliver on-demand video globally.
Realtime Systems
Location streams, live collaboration, fan-out, and stale state.
Ride Hailing Platform
Match riders and drivers under location churn and acceptance races.
Social Network
Create social graphs and feeds while controlling fan-out, abuse, and privacy.
Project Management Platform
Tenant-safe projects, tasks, comments, permissions, activity, and collaborative updates.
SaaS Architecture
Tenant isolation, roles, scheduling, and operational workflows.
Appointment SaaS
Multi-tenant scheduling with availability rules, holds, reminders, and calendar sync.
Hotel PMS
Property operations, room inventory, reservations, folios, and housekeeping across time zones.
Project Management Platform
Tenant-safe projects, tasks, comments, permissions, activity, and collaborative updates.