Bank Stack
Discord - discord.gg/TMDgWtEn
We are now on Udemy -
www.udemy.com/course/building-real-world-banking-s…
We build a Digital Bank MVP the practical way—feature first. From customer onboarding, accounts & ledger, transactions, internal/external transfers, bill pay and settlement, to a clean Angular UI, secure login/authorization ( PKCE), and real-world ops with Kubernetes/Helm and CI/CD.
Bank Stack
www.udemy.com/course/building-real-world-banking-s…
2 months ago | [YT] | 0
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Bank Stack
From an idea… to learners across 42 countries 🌍
and 9 languages 🗣️
“Spring Boot Microservices: Banking & Payment System Design”
reaching engineers worldwide.
Just getting started 🚀
#Udemy #SoftwareArchitecture #SpringBoot
www.udemy.com/course/building-real-world-banking-s…
3 months ago | [YT] | 0
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Bank Stack
Proud to share that my course
“Spring Boot Microservices: Banking & Payment System Design”
is now part of the Udemy Business collection.
Grateful. Onward.
#UdemyBusiness #SystemDesign
3 months ago | [YT] | 2
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Bank Stack
Scenario
Your banking system exposes an API:
POST /payments
User initiates a payment of $100 from their account.
Due to poor network or UI retry, the same request is sent multiple times:
{
"fromAccount": "ACC123",
"amount": 100
} Problem
System processes both requests:
First request → Debit $100 ✅
Second request → Debit $100 ❌
User is charged $200 instead of $100. Question
How would you design the system so that:
1 The same request is processed only once
2 Duplicate API calls return the same response, not a new transaction
3 months ago | [YT] | 1
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Bank Stack
discord.gg/TMDgWtEn
3 months ago | [YT] | 0
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Bank Stack
A good architect knows what to build.
A better architect knows what not to build.
I removed my custom auth-core service and switched to Auth0.
Identity is a solved problem.
Banking systems should focus on payments, ledgers, and reliability. www.udemy.com/course/building-real-world-banking-s…
3 months ago | [YT] | 0
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Bank Stack
In my course we don’t build “Todo Apps”.
We build:
• Account Services
• Payment Orchestration
• Event-Driven Debit Flows
• Auth0 + JWT Security
• Kafka-based Payment Status Handling
If you can design a banking system,
you can design anything.
Stop building CRUD.
Start building systems. 🚀
www.udemy.com/course/building-real-world-banking-s…
3 months ago | [YT] | 0
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Bank Stack
We devs learn CRUD apps.
But very few of us learn how real banking systems actually work.
In my course, we build:
• Microservices-based banking core
• Event-driven payment flows
• Secure APIs with real auth
• Production-ready architecture
No toy projects.
We build systems that feel real.
If you want to think like a fintech architect — this is for you.
udemy.com/course/building-real-world-banking-syste…
#springboot #udemy #kafka #micorservices #Java
3 months ago | [YT] | 3
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Bank Stack
In a payment system:
Orchestrator
Accounts
Worker
Settlement
Could this be a monolith? Yes.
Did we split it? Yes.
Why?
To demonstrate:
• async flows
• failure isolation
• scaling differences
• distributed consistency
Education ≠ blind production advice.
udemy.com/course/building-real-world-banking-syste…
#udemy #springboot #monolith #microservices
3 months ago | [YT] | 1
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Bank Stack
Interview Question:
“In Zero Trust, how do microservices authenticate when calling each other?”
If your answer is “they’re inside the cluster so it’s safe” ❌
Correct answer:
→ Forward user JWT
→ Validate in every service
→ No implicit trust
This is how real banking systems work.
I break this down practically in my Spring Boot Banking Systems course.
www.udemy.com/course/building-real-world-banking-s…
3 months ago | [YT] | 2
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