Domain Knowledge Learning Path

Great engineers do more than write code. They understand the business domain behind the code.

Domain knowledge helps you design better systems, ask better questions, communicate with product teams, and make stronger architecture decisions. A developer who understands both technology and business context becomes much more valuable in real projects.

This learning path covers the domains most commonly seen in enterprise software:

• Banking
• Insurance
• Payments
• E-Commerce
• Healthcare
• Capital Markets
• SaaS and AI Platforms

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How to Study Domain Knowledge

For each domain, learn in this order:

Step	Focus Area	What You Should Understand
1	Business fundamentals	What the domain does and who uses it
2	Core systems	Main applications, services, and data flows
3	Transactions	How money, orders, claims, or records move
4	Risk and compliance	Security, fraud, regulations, and audit needs
5	Architecture	How real systems are designed at scale

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Domain Learning Flow

flowchart TD

A["1️⃣ 🏦 Banking Domain"]
--> B["2️⃣ 🛡️ Insurance Domain"]
--> C["3️⃣ 💳 Payments Domain"]
--> D["4️⃣ 🛒 E-Commerce Domain"]
--> E["5️⃣ 🏥 Healthcare Domain"]
--> F["6️⃣ 📈 Capital Markets & Trading"]
--> G["7️⃣ 🤖 SaaS & AI Platforms"]

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Recommended Learning Plan

Phase	Domain	Why It Matters
Phase 1	Banking	Teaches accounts, money movement, fraud, loans, and core banking systems
Phase 2	Insurance	Teaches policy, claims, underwriting, fraud, and risk management
Phase 3	Payments	Teaches payment gateways, cards, settlement, reconciliation, wallets, and UPI
Phase 4	E-Commerce	Teaches catalog, cart, order, inventory, warehouse, recommendations, and returns
Phase 5	Healthcare	Teaches patient systems, EHR, claims, compliance, interoperability, and telemedicine
Phase 6	Capital Markets	Teaches trading, market data, risk, clearing, settlement, and portfolio systems
Phase 7	SaaS and AI Platforms	Teaches multi-tenancy, billing, identity, AI products, RAG, agents, and observability

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Complete Domain Knowledge Article Order

Banking Domain

No	Article
01	Banking Domain Fundamentals
02	Core Banking Systems
03	Checking vs Savings Accounts
04	Payment Processing Systems
05	ACH, Wire, and SWIFT
06	Credit Card Processing
07	Digital Banking Architecture
08	Fraud Detection Systems
09	Loan Management Systems
10	Banking Architecture Overview

Insurance Domain

No	Article
11	Insurance Domain Fundamentals
12	Life Insurance Systems
13	Health Insurance Systems
14	Auto Insurance Systems
15	Policy Administration Systems
16	Claims Management Systems
17	Underwriting Process
18	Insurance Fraud Detection
19	Reinsurance Overview
20	Insurance Architecture Overview

Payments Domain

No	Article
21	Payment Domain Fundamentals
22	Payment Gateway Architecture
23	Credit Card Transaction Flow
24	Visa and Mastercard Networks
25	Settlement and Reconciliation
26	UPI Architecture
27	Payment Fraud Systems
28	Digital Wallet Architecture
29	POS Systems Overview
30	Payment Architecture Overview

E-Commerce Domain

No	Article
31	E-Commerce Domain Fundamentals
32	Product Catalog Systems
33	Shopping Cart Architecture
34	Order Management Systems
35	Inventory Management Systems
36	Warehouse Management Systems
37	Recommendation Systems
38	Return and Refund Systems
39	Supply Chain Overview
40	E-Commerce Architecture Overview

Healthcare Domain

No	Article
41	Healthcare Domain Fundamentals
42	Electronic Health Records
43	Hospital Management Systems
44	Patient Management Systems
45	Healthcare Claims Processing
46	HIPAA Compliance Overview
47	Healthcare Interoperability
48	Telemedicine Architecture
49	Pharmacy Systems
50	Healthcare Architecture Overview

Capital Markets Domain

No	Article
51	Capital Markets Fundamentals
52	Stock Market Architecture
53	Trading Platforms Overview
54	Order Management Systems for Trading
55	Risk Management Systems
56	Market Data Systems
57	Clearing and Settlement
58	Portfolio Management Systems
59	Algorithmic Trading Overview
60	Capital Markets Architecture

SaaS and AI Platform Domain

No	Article
61	SaaS Domain Fundamentals
62	Multi-Tenant Architecture
63	Subscription Billing Systems
64	Identity and Access Management
65	AI Product Architecture
66	RAG Systems Overview
67	AI Agent Platforms
68	LLM Operations Overview
69	AI Observability Systems
70	AI Platform Architecture

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What to Focus on as a Developer

When learning any domain, pay attention to:

• Important business entities
• User roles and responsibilities
• Critical workflows
• Data ownership
• System boundaries
• Integration points
• Security and compliance needs
• Reporting and audit requirements
• Failure scenarios
• Scalability and performance expectations

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Architecture Thinking Checklist

Before designing a domain system, ask:

1. Who are the users?
2. What are the main business processes?
3. What data must be protected?
4. Which operations must be real-time?
5. Which operations can be asynchronous?
6. What regulations or audit rules apply?
7. What are the most common failure points?
8. What systems must integrate with this domain?

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Final Advice

Framework knowledge helps you build applications. Domain knowledge helps you build the right applications.

Learn one domain at a time. Understand the business flow. Then connect it to architecture, data models, APIs, security, and production operations.