KoladeBuilds

KoladeBuilds KoladeBuilds is the tech platform of Kolade Oluwadare, a Software Engineer focused on reliable mobile and backend systems.

I share insights on scalable architecture, engineering trade-offs, and real-world system design.

There are some bugs that don’t just break systems, they break trust.Earlier this week, I heard about a case where a paym...
14/04/2026

There are some bugs that don’t just break systems, they break trust.

Earlier this week, I heard about a case where a payment system double charged users. Not small amounts.

Same request. Processed twice.

No retries gone wrong. No obvious crash. Just a silent failure, the kind that looks perfectly fine on the surface until money starts missing. That’s what makes idempotency such an underrated concept in engineering.

Because in real systems, things will fail:
- Networks glitch
- Requests timeout
- Clients retry

And when they do, your system has to answer one simple question consistently: Have I already processed this?

If the answer isn’t airtight, you don’t just get duplicate logs, you get duplicate transactions.

The scary part is everything can look successful in your logs.

No red flags. No alarms.
Just incorrect outcomes… at scale.

This is why treating APIs as stateless endpoints without safeguards is risky. Real-world systems need memory, not just of data, but of actions already taken.

Engineering isn’t just about building features. It’s about preventing the kinds of failures that never announce themselves.

Have you ever seen (or caused 👀) a failure that didn’t look like a failure at all?

This is how Rate limiting affects your systems!
11/04/2026

This is how Rate limiting affects your systems!

I heard about an engineer who was easily one of the smartest people on the team. The kind of person who could look at a ...
10/04/2026

I heard about an engineer who was easily one of the smartest people on the team. The kind of person who could look at a broken system for five minutes and tell you exactly where the bug was hiding. When it came to raw technical skill, he was untouchable.

But year after year, everyone around him kept moving up. New titles. Bigger responsibilities. Broader impact.

And somehow, he stayed exactly where he was.

It wasn’t because he wasn’t good. It was because he was only good at code.

He didn’t document anything, he avoided discussions like they were traps. He treated every suggestion as an attack. He solved problems beautifully, but only the ones he personally felt like solving.

At some point, the team realized something:
You can’t promote someone who works alone, even if they’re brilliant.

A promotion isn’t a reward for being the smartest. It’s a signal that the company can trust you with people, decisions, chaos, and direction.

And that’s where he struggled.

He delivered features, but not clarity.
He wrote great code, but nobody could rely on him under pressure.
He fixed things, but didn’t help anyone else grow.

Years later, I realized something important. Your career doesn’t stall because you’re not skilled. It stalls when your skill doesn’t scale.

The engineers who move forward aren’t always the ones who write the cleanest code, they’re he ones who can influence, simplify, communicate, and bring others along.

Technical skill gets you in the room.
How you work with people determines how far you go.

Most engineering teams don’t actually have a rate limiting problem they have a problem of not planning for a real scale....
06/04/2026

Most engineering teams don’t actually have a rate limiting problem they have a problem of not planning for a real scale.
Rate limiting usually becomes a priority only when something starts exposing the gaps everyone quietly ignored. Your architecture isn’t as cloud-ready as the pitch deck claims, your infrastructure only looks stable because traffic is low, and your APIs start suffocating the moment real-world load shows up. And right there, the default solution becomes: Let’s just add rate limiting.

But here’s the uncomfortable truth, rate limiting shouldn’t be your shield. It should be your last line of defense. If adding a simple rate limit suddenly breaks the user experience or slows the whole system down, that’s not a traffic issue. That’s an engineering maturity issue. It means the system wasn’t designed with resilience in mind, and now the limits are exposing what the architecture was hiding.

Sometimes the real story is this: your system isn’t being protected by rate limiting, it’s being exposed by it. In a world where every app wants to claim scalability, rate limiting has become the band-aid we apply when deeper issues are too expensive or too inconvenient to address. But long-term scale doesn’t come from restrictions. It comes from designing with growth in mind from day one.

Do you think teams rely too heavily on rate limiting as a quick fix, or is it simply a necessary survival tool in today’s environment?

03/04/2026

Your Code Runs... But Do You Understand It?

One underrated benefit of Vibe Code–style challenges is that you’re not just asked to produce the answer, you’re forced to walk through your reasoning. And that requirement alone separates engineers from coders instantly.

A lot of developers can write code that works.
But ask them why they chose that approach, or what the trade-offs are, or how the solution behaves under stress, and you’ll quickly see whether they understand what they just wrote.

These challenges shows real engineering far more than people realise. In real systems, you’re not judged by whether you “got it to run.” You’re judged by:
• the assumptions you made
• the risks you ignored
• the failure points you anticipated
• the simplicity or complexity you introduced
• and whether the solution can scale beyond your laptop

That’s why I like problems that force you to talk through your thinking.
If your solution falls apart the moment someone asks a follow-up question, you didn’t engineer, you just coded.

Vibe Code challenges aren’t about showing off.
They’re about sharpening the mental tools that make you a reliable engineer under pressure.

Why Vibe Code Problems Expose Your Real Engineering LevelOne thing I’ve noticed with Vibe Code–style problems is that th...
02/04/2026

Why Vibe Code Problems Expose Your Real Engineering Level

One thing I’ve noticed with Vibe Code–style problems is that they expose something most people don’t want to admit: you can write code for years and still struggle to think like an engineer.

These problems look simple on the surface, but they test the parts of your mind that tutorials can’t teach.
You’re forced to slow down, reason from first principles, question your assumptions, and explain your thought process clearly. And that’s the real engineering muscle not just typing code quickly.

When you attempt one of these problems, you immediately see where your gaps are:
• Do you understand the constraints?
• Can you think in systems and not just functions?
• Can you reduce a messy problem into something predictable?
• Can you defend your solution if someone challenges it?

Real engineering is less about syntax and more about structured thinking.
And that’s why solving Vibe Code problems can be more educational than completing three weeks of random coding tasks.

If you want to grow as an engineer, don’t just solve problems, interrogate them.
The thinking you develop there will show up everywhere else in your work.

I'm KoladeBuilds
Let's talk software, systems and growth in tech.

31/03/2026

Stop watching tutorial over and over again, do the is instead

There’s a quiet moment in every developer’s journey that nobody warns you about.In the beginning, it’s all about surviva...
31/03/2026

There’s a quiet moment in every developer’s journey that nobody warns you about.

In the beginning, it’s all about survival, learning whatever framework they throw at you, shipping features fast, proving you’re not slowing the team down. You judge yourself by how many tickets you close and how quickly you can fix things.

But then one random day, something shifts.

You read a ticket and, for the first time, your instinct isn’t, “Alright, how do I build this?”
It becomes, “Hold on… does this even make sense?”

And suddenly you’re asking questions you never used to ask:
• Is this the simplest way to do it?
• Are we even solving the right problem?
• What’s the hidden cost of doing it like this?
• If this thing fails at 2 a.m., who’s suffering?

That moment is the real promotion. Not the one HR emails you about. Not the one LinkedIn applauds.

It’s the one where your thinking matures.

People will definitely notice it too even if you don’t because, your code reviews hit differently, your standup contributions shift from status updates to actual insights, you also stop being the person who just builds things and start becoming the person who influences how things should be built.

No tutorial teaches this.
Experience does, curiosity does and asking better questions does.

So if you’ve been feeling that shift lately, don’t brush it off.
That’s your engineering brain waking up.

I'm Kolade Oluwadare
Let's talk software, systems and growth in the tech.

Building software from Lagos with unstable power, expensive data, and a lot of daily constraint, and still shipping to t...
28/03/2026

Building software from Lagos with unstable power, expensive data, and a lot of daily constraint, and still shipping to the world.
it's not a disadvantage, it is a different kind of toughness.

Where are you building from?

Building software from Lagos comes with its own unique reality, you'll have to face unstable power, expensive data, unex...
28/03/2026

Building software from Lagos comes with its own unique reality, you'll have to face unstable power, expensive data, unexpected disruptions, and the kind of daily constraints that test your patience and discipline. But somehow, we still show up. We still build. We still ship to the world.

Over time, I’ve realised that this isn’t a disadvantage.
It’s a different kind of toughness.

It teaches you how to think on your feet, how to stay resourceful, and how to keep moving even when conditions aren’t perfect. It forces a level of grit and creativity that you can’t learn from any book or course.

And honestly, there’s something powerful about knowing your work is reaching global users despite all the odds stacked against you.

So let's converse.

Where are you building from, and what has it taught you?

And lastly, how are you dealing with the current light situation?

Java programming language is not dead
27/03/2026

Java programming language is not dead

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