JExcellence and Once UI: Turning experiments into enterprise apps

Justin

At JExcellence, I transform side projects into enterprise-ready applications, leveraging the Once UI framework to build intuitive, scalable, and modern solutions.

What began as side projects has grown into JExcellence—a journey of crafting enterprise-grade applications with the power of Once UI.

Justinjexcellence.de

Experience10+ years

FocusEnterprise-grade apps

Can you tell a bit about yourself and how you got into coding?

I’m Justin, 25, from Germany. By day, I work as a full-stack developer at a company that builds web-based financial software for municipalities. Right now, I’m part of the automatic testing team, making sure everything we ship is reliable and solid. But really, my journey with code started way before that. I’ve been programming for over a decade — first as a hobby, and for the last couple of years more officially through my own company.

4-6 hoursSpent coding after work

It all began with Minecraft. I was following tutorials, tinkering around, until I noticed a plugin nobody had ever built properly. That challenge kept me busy for six years. I even ran a full Minecraft server powered entirely by plugins I wrote myself. My very first website came out of that too: a trading auction system connected to the server. From there, things slowly grew. I picked up my first contract doing WordPress sites, then got curious about new frameworks and tried out everything I could — Vue, Angular, React, and more. Somewhere along the way, I realized I was spending 80% of my day coding. Sometimes I built useful tools; sometimes I just experimented with random ideas. I made plenty of mistakes, fixed them, and kept going. That’s still how I approach programming today: with curiosity, a willingness to try new things, and the drive to turn side projects into something bigger.

What kind of side projects did you first use Once UI for?

I first came across Once UI while building a simple

beauty site

for a client. I wanted the design to look clean and professional without spending weeks reinventing layouts and components. Once UI made that process smooth — I could focus on content and flow instead of pixel-perfect styling.

That project gave me the confidence to rework my own company site,

JExcellence

. It felt natural to apply the same design system to present my work in a polished way. From there, my projects kept getting bigger. Right now, I’m working on ABD Quality, a testing platform where Once UI really shines. The platform handles secure logins, dashboards, and transforming massive datasets — think 50,000+ lines of JSON — into something human-readable. It also allows running automated tests via REST APIs, all within a streamlined interface. I’m also building Klyck, a no-code Linktree-style tool that lets anyone design custom landing pages using Once UI components, without writing a single line of code. On the fun side, I’m planning to rebuild a Minecraft website, where Once UI will power the frontend for exploring server data — player stats, inventories, and more — directly in the browser. What started as a quick way to design a beauty page has turned into the foundation for everything I build, from small freelance projects to large-scale enterprise apps. Once UI has become the bridge between my creative ideas and real, usable products.

What's your favorite component?The Background — I’ve already added new features to it, and I can’t wait to extend it further!

What made you decide to bring Once UI into your company’s workflow?

Honestly, it was the people behind it. The creators genuinely understand developers’ needs. They’re always friendly, and it’s clear they’re not just in it for the money — they’re building tools to help people who aren’t deep into web development, especially design. That mindset clicked with me, so I gave it a try.

How did Once UI help in building internal tooling at your company?

I started using it for a testing platform I was building. With Once UI, I could move incredibly fast while keeping everything clean and professional — which is essential for business tools. It allowed me to focus on logic and workflows, not just design.

What was the reaction from your team when you introduced it?

It was honestly insane. People kept asking how long it took me to get the project to its current state and what I was using. From the outside — especially for teammates unfamiliar with Once UI — it looked like I had pulled off something huge in almost no time.

Did using Once UI at work change the way you think about your own projects?

Definitely. Once UI showed me how much speed and structure matter when building something new. It made me rethink the balance between experimenting endlessly and actually finishing a project.

What’s one challenge you faced when moving from hobby building to professional use?

Documentation. I’ve always hated it, but in a professional setting, you can’t avoid it. I also had to stop rewriting entire projects just to make them “perfect.” When you’re building for yourself, that’s fine, but with customers waiting, you have to ship. The hardest lesson: improvements are great, but if you keep perfecting while trying to release, you’ll never finish. My advice: Keep your code clean, but don’t chase perfection before launch. Finish the first version, get it out there, and then improve it. Otherwise, you’ll be stuck rewriting instead of shipping.

"Justin’s journey with Once UI showed me that design struggles are more about tools than competence. Industry standards give toolkits; Once UI gives solutions."

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Lorant

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