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Kelvin Hung

@hungmanhdev

theengineeringjourney

Joined January 2026

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Kelvin Hung's blogs

The Engineering Journeyengineeringjourney.hashnode.dev6 posts

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KHKelvin Hungengineeringjourney.hashnode.dev

Bean Scope in Spring

Mar 1 · 3 min read · In the previous articles Understand Spring Dependency Injection, we talked about how Spring builds and wires your object graph. Now there’s another piece that quietly affects how your application beha

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KHKelvin Hungengineeringjourney.hashnode.dev

Understand Spring Dependency Injection

Feb 22 · 5 min read · In the previous article, we explored Dependency Injection in plain Java — no framework, no annotations, just constructor injection and a manually written composition root. We saw that DI is not about

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KHKelvin Hungengineeringjourney.hashnode.dev

Understanding Dependency Injection in Java

Feb 22 · 5 min read · Dependency Injection (DI) is one of those concepts every Java developer has heard of. Many associate it immediately with Spring. But DI is not a framework feature — it’s a design principle. If you rem

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KHKelvin Hungengineeringjourney.hashnode.dev

Where To Securely Store Tokens In Client Application?

Feb 10 · 4 min read · Storing tokens on the client side is one of those topics that repeatedly sparks debate among frontend and backend engineers. Ask different developers and you’ll likely hear completely different answers: localStorage, cookies, memory-only… The confusi...

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KHKelvin Hungengineeringjourney.hashnode.dev

Designing a Secure Authorization Architecture: Do You Really Need OAuth2?

Feb 9 · 7 min read · Authentication and authorization are fundamental parts of any modern application—but choosing the right strategy is not a one-size-fits-all decision. This also a common misunderstanding topic in technical interview. In this article we’ll explore: Au...

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Kelvin Hung

About

Available for

Kelvin Hung's blogs

Recently published

Bean Scope in Spring

Understand Spring Dependency Injection

Understanding Dependency Injection in Java

Where To Securely Store Tokens In Client Application?

Designing a Secure Authorization Architecture: Do You Really Need OAuth2?

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Kelvin Hung

About

Available for

Kelvin Hung's blogs

Recently published

Bean Scope in Spring

Understand Spring Dependency Injection

Understanding Dependency Injection in Java

Where To Securely Store Tokens In Client Application?

Designing a Secure Authorization Architecture: Do You Really Need OAuth2?