Kaloyan Dimitrov

Java • Spring Boot • Distributed Systems.
Sharing what I learn while building real systems.
Here to learn, share & connect

[Kaloyan Dimitrov @kaloyancodes]

When I started with Kubernetes, I literally kept a cheat sheet next to me (like GTA San Andreas codes 😅).

Now kubectl is one of my core tools — pods, logs, rollouts, scaling, debugging.

Dropping the cheat sheet that helped me a lot 👇

#kubernetes #backend #springboot #kubectl

[Kaloyan Dimitrov @kaloyancodes]

Spring looks easy… until you realize how much magic these annotations hide. 😅

- Configuration
- ComponentScan
- Autowired
- Lazy
- Profile

Understanding how Spring creates and manages beans was a huge level-up for me as a backend dev.

Which annotation is the most underrated?

[Kaloyan Dimitrov @kaloyancodes]

@Marcilenyaraa Sites

[Kaloyan Dimitrov @kaloyancodes]

@yourtechgirl24 SEND

[Kaloyan Dimitrov @kaloyancodes]

Curious to hear from others:

What’s the HARDEST part of microservices in real life?

For me:
Understanding failures between services
retries, timeouts, circuit breakers, tracing…

The code is the easy part.
The reliability is the fight.

What’s yours?

[Kaloyan Dimitrov @kaloyancodes]

How would you architect a *centralized Kafka publisher* that accepts messages from many services (different payloads) and forwards to multiple topics?

Looking for real-world setups & trade-offs. What worked, what hurt?
#kafka #architecture #microservices #devops

[Kaloyan Dimitrov @kaloyancodes]

The real skill in software isn’t just writing code.

It’s staying curious.
Learning continuously.
And staying calm when things break.

Code is technical.
Growth is personal.

#devlife #backend

[Kaloyan Dimitrov @kaloyancodes]

In simple terms: change the factory → the whole product family changes.

[Kaloyan Dimitrov @kaloyancodes]

Abstract Factory = create related objects as a family, without tying your code to concrete classes.

Good for:
• Consistent variants
• Swappable implementations
• Cleaner architecture

Use it when you need interchangeable “themes”.

[Kaloyan Dimitrov @kaloyancodes]

@EOEboh I use both of this. Debugging skills are essential in our work.

But still nothing makes a day better when you see the random log you have put like "I am here" in order to check if block of code is called🥲

[Kaloyan Dimitrov @kaloyancodes]

Everything passed in QA, yet production went down for 1 hour.

Why? No alerts. No exception spike monitoring. No visibility.

The code was fine — our observability wasn’t.

Shipping code is easy.
Keeping systems alive is engineering.

#devops #backend #softwareengineering

[Kaloyan Dimitrov @kaloyancodes]

@livingdevops DevOps is 90%:
“Why is this broken?”
"Wait, I didn’t touch anything."

[Kaloyan Dimitrov @kaloyancodes]

@brankopetric00 So true. The hardest part isn’t writing the services — it’s debugging the spaces between them.

Without tracing + retries + circuit breakers + clear ownership, you’re basically chasing invisible failures.

[Kaloyan Dimitrov @kaloyancodes]

@_trish_xD Totally agree — performance is architecture first.

But inside that flow, memory allocation, data structures and Big O decisions add up fast.

Flow + internals = real performance.

[Kaloyan Dimitrov @kaloyancodes]

If you want, I can share a small Java / Resilience4j example.

[Kaloyan Dimitrov @kaloyancodes]

Last week a downstream dependency slowed down and our service couldn’t start.

Solution: Circuit Breaker.

Fail → open → pause → recover → retry.

This prevented a cascading failure.

Microservices need resilience, not just more services.

#microservices #backend #java

[Kaloyan Dimitrov @kaloyancodes]

Source that helped me visualize the flow:
https://t.co/0l5ygdcn2S
Credits to the author 👏

[Kaloyan Dimitrov @kaloyancodes]

@vibingmonk Fair point. But today’s systems move fast.
We don’t need to be experts in every layer, just aware enough to work effectively and ship reliable products.

[Kaloyan Dimitrov @kaloyancodes]

@systemdesignone In Java services I treat idempotency as “the same request = the same result, no side effects.”
Often ends up being a combination of request IDs + database checks + safe retry logic.

[Kaloyan Dimitrov @kaloyancodes]

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[Kshitij Mishra | AI & Tech @DAIEvolutionHub]

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