Payment Processing. Transaction Handling. Enterprise Integration.

IV: Business & Transaction Systems

When money moves, a wrong design is not a bug: it is a double charge. AI writes the integration code; the skill that matters is judging whether the design is correct, which of the seven building blocks a payments, commerce, or CRM system actually needs. This course builds that judgment on how Stripe, Shopify, and Salesforce were designed.

Apply the seven building blocks from Course I to systems where correctness is non-negotiable. You will study how Stripe, Shopify, and Salesforce were designed across 4 progressive case studies, from peer-to-peer payments to dynamic-pricing marketplaces, so the patterns behind every transactional system become clear.

7-day money-back guarantee · Lifetime access

Prerequisites: Courses I, II, & III (required)

Course Preview

Course at a Glance

4
Case Studies
10+
Video Lessons (in production)
2
Interactive Labs
1
Comprehensive Assessment
3
Challenge Parts

Four Progressive Case Studies

Course IV completes your transformation with business-critical patterns. You'll master transaction processing, payment integration, and enterprise system patterns.

1. Financial Services Platform: Compliance by Design

Building Blocks:  Service+ Relational Database+ Worker+ Time+ External Service

Learn: Immutable audit-log architecture, identity and transaction-monitoring pipelines, retention and regulatory-reporting strategies (regulated fintech-style systems)

  • Immutable audit-log architecture (append-only, hash-chained)
  • Identity, monitoring, and reporting Worker pipelines
  • Retention-policy enforcement design, with Time as the clock

Note: We focus on compliance architecture and audit-log patterns, not specific regulatory bodies or compliance software.

2. Online Store Platform: E-Commerce at Scale

Building Blocks:  Service+ Relational DB+ Queue+ Worker+ External Service

Learn: Inventory management patterns, order fulfillment architectures, payment integration strategies (Shopify-style systems)

  • Shopping cart and checkout flow design
  • Inventory tracking and update patterns
  • Order processing pipeline architectures

Note: We focus on e-commerce architecture and fulfillment patterns, not specific inventory systems or payment gateways.

3. Auction-Based Marketplace: Real-Time Bidding

Building Blocks:  Service+ Relational DB+ Queue for bid processing

Learn: Concurrent bidding architecture, transaction isolation strategies, winner determination patterns (eBay-style systems)

  • Real-time bid processing design
  • Transaction isolation architectural strategies
  • Winner selection algorithm patterns

Note: We focus on auction architecture and concurrency patterns, not specific database transaction mechanisms.

4. Dynamic Pricing Marketplace: AI-Driven Decisions

Building Blocks:  Service+ Relational DB+ External Service

Learn: Real-time pricing architecture, demand prediction patterns, dynamic adjustment strategies (Uber surge pricing-style systems)

  • Dynamic pricing architectural strategies
  • AI-powered demand forecasting patterns
  • Real-time price adjustment design

Note: We focus on pricing architecture and AI integration patterns, not specific ML models or forecasting algorithms.

Why This Course Series?

There's plenty of free content on system design. Here's why this is different.

The Framework Is Free. The Judgment Is Earned.

The seven building blocks are free to learn. Knowing which ones a transactional system needs, where a single wrong call costs real money, is the part that takes reps, and reps come two ways. You study how Stripe, Shopify, and Salesforce were designed across four progressive case studies. Then you get hands-on practice designing your own systems, in graded designs and a three-part challenge where you make every correctness and integration decision yourself, with no walkthrough to lean on.

Feedback On Your Design Decisions

Free resources teach you the concepts. They do not tell you whether you applied them correctly.

Here you submit your designs and get specific feedback on the decisions you made: which ones held up, and which ones a senior engineer would have questioned. When the system handles payments and orders, those are the decisions you cannot afford to get wrong.

A Rare Combination

20+ years building commercial software at scale.
10+ years teaching at the university level.

Most practitioners can't teach. Most teachers haven't built. This course is designed by someone who's done both.

Let's Talk About Value

What others charge:

  • Interview prep courses: $500–$2,000
  • Bootcamps: $10,000–$20,000
  • 1-on-1 coaching: $200/hour

What this course series gives you:

  • Complete framework across 4 domains
  • AI feedback on your work
  • Portfolio-ready design challenges

Start with Course I for $99. Build your foundation first.

EARLY BIRD

Course IV at $114

Content, labs, assessments, and challenges are live. $35 off until the videos are recorded.

$114 $149

Early-bird discount while videos are in production

✓ Lifetime access   ✓ 7-day money-back guarantee

Start Your Journey Now

Course IV requires completing Courses I, II & III first.
Course I is self-paced. Start any time, take it on your schedule.

Start with Course I

7-day money-back guarantee on Course I

Why Business Integration Domain Expertise Completes Your Transformation

Business systems are career-critical: Stripe's payment processing, Shopify's e-commerce platform, Salesforce's CRM integration, Uber's dynamic pricing. Understanding business patterns gives you architectural fluency in revenue-generating and enterprise systems.

What You'll Master

These patterns apply whether you're building a payment platform, online marketplace, or enterprise system. Master business integration, and you'll have architectural expertise across all business-critical domains.

Complete Your Transformation - The Final Course

Systems Thinking in the AI Era is a 4-course comprehensive transformation program. Course IV completes your journey, giving you pattern mastery across all major system domains.

✅ Course I: Universal Building Blocks (Required Foundation)

Master the 7 building blocks + 3 external entities. Develop pattern recognition, trade-off analysis, and architectural decision-making.

✅ Course II: Content Systems (Required)

Apply building blocks to Instagram, Netflix, YouTube patterns. Master read-heavy workloads, caching strategies, and global content delivery.

✅ Course III: Real-Time Systems (Required)

Learn Slack, Discord, WhatsApp patterns. Master real-time messaging, WebSocket patterns, presence systems, and low-latency communication.

📍 Course IV: Business & Transaction Systems (This Course)

Master Stripe, Shopify, Salesforce patterns. Learn payment processing, transaction handling, compliance automation, and enterprise integration. Completes your transformation.

Complete all four courses to become a Senior Systems Thinking Architect - with architectural expertise across every domain.

Complete the Full Course Series

Course IV will be available soon. Start with Course I to begin building the architectural thinking skills that matter in every domain.

Start with Course I

Four courses. Complete transformation. Architectural mastery.