mhj.digital (@mhjDigital) header
mhj.digital (@mhjDigital) profile picture

Design Engineer, design that compiles. 15 yrs product design → now shipping it myself. React/TS · design systems · DeFi & AI. Building in public.

Brussles, wish it was elswere
Joined December 2021
I used to hate (re)doing my portfolio, but I had so much fun with this one! Works like a small desktop with eight projects in the dock, case studies open as separate windows. (Had to think about an adaptation for mobile) I'm connecting product strategy, design leadership and working code. A look at how I work as a design engineer with AI in the loop. Now live: mhj.digital Have a play. I’d love your feedback.
1
6
644
Wild times… Im on holiday in Japan, with just my phone. Ive created a complex full stack web app, in a couple of days. Used Grok Bot, Codex and Claude. Made them collaborate via GitHub and deploy to Vercel. Im almost finished, the results are as good as if I had access to an actual computer… From idea, to prototypes, interaction studies, PRs, strategies… barely typing a word, just from my voice. I’m mind blown. I hate to say it but, I might have to create a YT channel and show my process, and most importantly the result. But don’t believe the hype, you CANT one-shot great designs.
51
Ive been using both Grok bot and OpenAI Dot while on holiday to work on projects. And holy fuck. Grok MOGS Dot. The speed is just insane.
2
4
367
The only thing that sucks ball on Grok is the dictation feature, it crashes the app all the time. Can you fix this @romanugarte_
2
29
I’ve been building City Network Defense, a tower defence game for iPhone and iPad. The beta is open and I’d love some fresh eyes on it. Fancy giving it a try? Feedback on what’s fun or confusing would be really helpful 🙂 testflight.apple.com/join/ed…
2
3
85
Built a whole tool because two rounded corners looked slightly wrong. Concentric shows the fix: inner radius = outer radius minus padding. Circular corners, live preview, copyable CSS. mathieuhj.github.io/tiny-des…
1
3
221
The most useful tower in my tower defence game doesn't fire. It powers the others and helps them work as a network. A small systems-design obsession that escaped Figma.
1
2
72
I turned squinting at a design into a tiny tool. Drop in a screenshot, blur it, see what survives. Export both versions so "I can't see the button" comes with a receipt. mathieuhj.github.io/tiny-des…
1
3
112
One photo. Six formats. Easy to lose the subject in one of them. I made Crop Proof to move one focal point across six crops, then export the sheet and copy the CSS. mathieuhj.github.io/tiny-des…
19
I rebuilt my brand agent skills. Nine now, brief to QA: art direction, tokens, naming, identity, voice, claims. Each returns JSON against a schema. The model judges; small scripts check contrast, totals, claims and verdicts. github.com/MathieuHJ/brand-a…
3
82
Cooked and deployed a website for my brother's business in 1h. All via Codex. Prompt with reference → fix 2x → OpenAI Sites for QA → Domain and hosting → Deployment Kinda nuts how high the bar is today.
2
47
One avatar, one banner, four platforms, several opportunities to crop it badly. I made Profile Kit to preview the crops, bio and feed, then export the files. Approximate layouts, all local. mathieuhj.github.io/tiny-des…
1
3
142
I keep making tiny tools to avoid doing tiny tasks by hand. Five so far: crop checks, hostile copy, the squint test, nested corners and profile previews. Free, open source, in your browser. No account or upload. mathieuhj.github.io/tiny-des…
3
61
Another day, another 2000 startups die
GPT-6 and Intelligent UI, now rolling out in ChatGPT for everyone. Intelligent UI in ChatGPT delivers fast, interactive answers that make everyday questions more visual, complex topics easier to grasp, and interactive tools for your task available on the spot.
2
53
You feel overwhelmed and cant keep up but you are so early. 80% of the world population has never even used AI yet…
1
2
66
mhj.digital retweeted
An actual OG list, not regurgitated TikTok slop
1
3
357
mhj.digital retweeted
the best part about vibe coding is i’ve spent my entire career in a structured process, coordinating feedback and now i can just make design decisions impulsively and intuitively. and, this is the crazy part, i don’t have to justify them to anyone.
21
1
95
4,417
Exploring has never been so much fun 😂
6
351