Cornelius Mark

Hello, I craft macOS and iOS apps that scale, perform, and delight users. From modular architectures to bug-free code, I deliver solutions that grow with your vision. Let’s chat about your next project! Here’s what clients say about my work: ⭐⭐⭐⭐⭐ "Mark is a guru in everything MacOS and app store related. A pleasure to work with!" – Safari extension for a search engine. ⭐⭐⭐⭐⭐ "Great communication, fluent English, quick action, knows exactly what he's doing." – macOS taskbar app. ⭐⭐⭐⭐⭐ "Mark was great to work with and is an expert at his craft." – WidgetKit widgets for Big Sur. DM me let's build something amazing! Best, Mark

@Jesse_can_code Agreed. Don't use Floats use Decimals instead.

Stop Vibe coding Fintech Apps Stop Vibe coding Fintech Apps Stop Vibe coding Fintech Apps Stop Vibe coding Fintech Apps

Think twice before adding deep customization too soon. It feels smart, but it builds technical debt fast. Keeping the experience simple and reliable gives you speed to grow. Most people value basics that work every time over personalized extras.

@tsybalab @iyoushetwt Test it.

@corneliusmark @iyoushetwt User also expected to be high to match frequency?

Serious question: What is this block on laptop chargers for?

@tsybalab @iyoushetwt Yes, and that's not the only possible reason of a high frequency in the grid.

@corneliusmark @iyoushetwt 5G?

The crowd shouts "personalize or die." Real winners ignore that in the beginning. A standard, clean app lets you ship much faster and scale without pain. Users mostly want things that just work, not niche extras that complicate everything.

@Tech_girlll Yes, I've used it for several projects in the past.

@corneliusmark Is it good enough?

Any alternative to GitHub?

Describe this in your own words

@haha_girrrl You spelled passkey wrong.

Hot take: The username field is pointless. Change my mind.

@hernandoabella Create lots of small NGO's to influence public opinion in your favor?

After getting rich, what next?

@Layton_Gott Build in silence and launch it in public.

Build in Public? Or Build in silence and launch? Which side are you on?

Not hating but Apple needs to fix this ..

@benkimbuilds No, it's not. What are you stuck on?

mobile app distribution is 100x harder than building the app

@piyush784066 Neither. I would never use a "non pro" device for professional activities.

If you had to choose a laptop for coding… MacBook Neo or MacBook Air, which one would you choose?

@NoahKingJr Back to pigeons.

WhatsApp can't be trusted. Signal can't be trusted. Telegram can't be trusted. Instagram can't be trusted. Then what is the solution?

@yossabourne Agreed. Both work really good together.

SwiftUI vs UIKit in 2026? Unpopular opinion (and friendly reminder): You can use both in one app. 😅

@2sush @grok answer this with really bad grammar.

Bad grammar is thhe new proof of being human

Everyone pushes heavy personalization from day one. But the apps that scale quickly stay simple and clean early. Data proves most users prefer solid basics over fancy tweaks. Over-customizing is usually ego in disguise, and it quietly stops your growth.

@codewithpri People skills.

One tech skill that paid off the most?