Abuja, Nigeria · 0xTMN8R

I build software.

I'm Dr. Osi-Okeke Ugochukwu. I ship offline-first web applications that run with no server, no accounts and no build step — and I practise medicine, which is where the habit of examining a problem before treating it came from. I design brands too.

  • JavaScript · Python
  • Offline-first PWAs
  • Brand identity
Portrait of Dr. Osi-Okeke Ugochukwu

Software

Four applications, all live. A recurring constraint runs through them: no server, no accounts, no build step — your data stays in your browser, and the thing still works with the network off.

afa

Live

Privacy tool · single HTML file

Scoped, expiring contact links. Linktree is a broadcast — one public page, identical for everyone. afa is the inverse: you choose which fields to share, how each is exposed, and when each expires. Button-only mode fires a real tel: or mailto: without ever rendering the value, so there is nothing on screen to photograph.

No server, no accounts. Payload rides in the URL fragment as packed binary — a number plus expiry costs ~55 characters instead of ~170 as JSON. Named for the Igbo word for name.

Offline-first PWA · single HTML file

A habit, workout and quest tracker built as a co-pilot rather than a dashboard. It ranks what deserves attention, names one next action, and stays quiet when nothing qualifies — saying why it is quiet, because an empty panel is indistinguishable from a broken one.

Six engines: attention ranking, a lifecycle state machine, and a quality gate that visibly rejects its own recommendations. Structurally cannot invent a number about you — no evidence renders an em dash and the reason.

Lab Link

Live

Health platform

Book laboratory tests from anywhere and receive results securely online. Built for a market where the friction is rarely the test itself — it is the trip, the queue, and the paper envelope that arrives days later.

The one project where the medicine and the code are the same job: knowing which results matter, and how quickly, is a clinical question before it is a product one.

Financial instrument · single HTML file

Deliberately not a budgeting app. It has one job: keep operational capital alive until a fixed deadline. Log a discretionary expense and it tells you, before you commit, exactly how many days of runway that purchase destroys.

Adversarial by design — a failing discipline score or a RED risk state suspends discretionary logging for 24–72 hours, and the cooling-off period is not negotiable. Runs offline, stores nothing off-device.

Also a doctor, and a designer

The other two practices. They are not a sideline — they are where the engineering habits came from.

Medicine

Clinical practice across internal medicine, general surgery and emergency care. The discipline that taught me to take a history properly before reaching for a treatment — which turns out to be most of debugging.

Design

Logo and identity systems, and how they hold up once they leave the screen — packaging, merchandise, stationery. Every mark below was drawn for a real client and shipped into real use.

Design

Identity and brand systems for three clients, each mark shown as it was delivered.

Lonestone Consult logo: an angular LS monogram in red and black above the company name

Lonestone Consult

Logo & identity

An interlocking LS monogram cut from a single angular path, splitting red into black at the diagonal.

CSZN wordmark in gold on black, split by a fine vertical rule

CSZN

Identity system

Two registers for one name: high-contrast serif capitals in gold, split by a hairline rule — restraint doing the work instead of ornament.

CSZN wordmark drawn as geometric monoline letterforms in a purple gradient

CSZN — monoline

Wordmark variant

The same four letters rebuilt from arcs, a diagonal and a single dot, so the name survives being reduced to geometry.

CSZN monoline logo embossed in purple foil on a matte black gift box

CSZN — packaging

Brand application

The monoline mark as purple foil on matte black — the test of whether a logo drawn on screen survives contact with a physical surface.

Navire logo printed on a white baseball cap

Navire

Identity & merchandise

A stencil-cut wordmark whose V grows into a leaf, tested where it actually lives — on cloth, at small sizes.

What clients said

Very satisfied with the design. It's sophisticated and elegant.
CSZN
Great work. Very satisfied.
Navire

About

I qualified in medicine and never stopped building things. What began as automating my own workflow turned into writing software other people rely on; what began as drawing crests for student bodies turned into identity work for consultancies and startups.

The applications above share a bias I keep coming back to: own your data, and assume the network is not there. No accounts, no servers holding things hostage, no build pipeline between an idea and a working page. It is a constraint, and constraints are what make the work interesting.

Lately most of that building involves AI, which is where the handle 0xTMN8R comes from. The medicine hasn't gone anywhere — it's the reason I'm suspicious of confident answers that haven't been examined.

If you want an application built, a brand designed, or an opinion on something in between, the form below reaches me directly.

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Get in touch

Tell me what you're trying to build. I read everything that comes through here.