The trick to making your app feel instant is prefetching aggressively and applying optimistic updates where applicable. Really sweetens the user experience.
Stop writing logic in your controllers!.
Stop writing logic in your controllers!!.
Stop writing logic in your controllers!!!
That’s exactly why the service layer exists.
Controllers should mainly handle the HTTP layer: receiving requests, validating inputs, calling the appropriate service, and returning responses.
Business logic belongs in the service layer.
Keep your controllers clean.
The problem
Most notification systems start simple: user does X, and send them a push/email/SMS.
Works fine at 1,000 users.
At 5 million users, that same code brings down your database, floods your SMS provider, and gets your domain blacklisted for spam.
Here's how to actually build one that scales.
So that was the problem Tunde was staring at on a Monday morning, after his "send welcome email" function took down the entire user service during a signup spike.
A Nigerian healthtech/fintech startup built an app that processes patient medical records plus financial and payment data.
They hit 18k users fast and raised decent pre-seed funding.
Then NDPC and NCC both came knocking for overlapping violations on data protection, telecom rules, and health data handling.
The company is now stuck in audits, facing massive exposure in 2026.
Here’s how multiple regulators overlap and why most founders get blindsided:
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Now people don’t even know what Lorem Ipsum is and their first website is a SaaS product hosted on Netlify with Google auth, stripe payment and Resend . 😂
Interesting times.
I have used AI consistently to code for the past 2 years.
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Red flags I ignored as a freelancer… and how they cost me money
If you’re just starting out, read this carefully.
I learned these lessons the hard way 🧵
FINTECH TIPS
If you’re building a fintech app, logging is not optional it’s a core security feature.
One of the strongest fraud detection mechanisms is detailed activity logging for your back-office admins.
Track everything:
• Login and logout activity
• Failed login attempts
• Password resets
• User creation and role changes
• Data updates, deletions, and new records
• Payment approvals or reversals
• Account status changes
• Permission changes
• Sensitive data access
You should always know:
Who did it
What was changed
When it happened
From where (IP/device/location if needed)
Without proper audit trails, fraud investigations become guesswork.
Good logging protects your customers, your business, and your compliance posture.
In fintech, if it’s not logged, it didn’t happen.