I'm Gregory, a software engineer in Nairobi, most recently Chief Software Engineer at Webtech, and a Software Engineering student at USIU, class of 2027. I build impactful systems that organisations run their day on: trust accounting for a law firm, operations for a flower farm, bookings for a safari operator, a point of sale that keeps selling offline.
greg@portfolio:~$ cat about.txt
I started out teaching kids to code at Somo Africa in 2023. Since then I've shipped marketplaces, finance apps, a database engine written from scratch, and systems that real businesses open every morning, while still sitting exams at USIU. I care about the unglamorous parts: the rule enforced in four places, the sale that syncs exactly once, the default that fails safe.
The longer versionSelected work
2026 · Developer (Solo)
A privacy-first caregiving agent for older adults who live alone: it learns a daily rhythm from Ring sensors, never the camera, asks her first when a day breaks pattern, then a neighbour, then family with the evidence, and reports slow drift in plain words.
2026 · Developer (Solo)
A studio for making motion graphics with Claude, where every video is a program: a frame-accurate renderer, synthesized scores, automated checks on every film, a Claude Code skill that runs the whole pipeline, and an eight-lesson course with a companion website.
2026 · Full-Stack & Mobile Developer (Solo)
An offline-first point of sale for a Kenyan liquor store: an Android app that keeps selling with no connection and syncs every sale exactly once, plus an owner dashboard for profit, stock, till shortages, debts and supplier balances.
2026 · Full-Stack Developer (Solo)
A practice management system for a Kenyan law firm (matters, court diary, trust accounting, billing, documents and a client portal), with the domain modelled from actual Kenyan statute and its architecture enforced by the linter.
2025 · Full-Stack Developer (Solo)
An 11-module personal finance suite (transactions, accounts, budgets, bills, savings goals, debts, loans, assets, wishlist and habits) with an analytics dashboard visualizing income and expenses.
Writing
In a caregiving agent, "is something wrong?" is the question that wakes a family at 7am, so a language model never answers it. Robust baselines and a drift test with a guard week decide; Amazon Nova only explains what the tools returned, and every quiet morning keeps its reason.
ReadMy webhook parser and my event simulator were written from the same wrong reading of Ring's payload, so a thousand replayed events were accepted and every test passed. The fix was not more tests but a source of truth neither of them wrote: Ring's documented examples, pasted in verbatim.
ReadOne rule about client money ended up in four places: the domain, a database trigger, a repository translation, and the ordering of two writes. Each answers a different question, and removing any one leaves a system that passes its tests and is wrong on a busy afternoon.
ReadKeep going
The home page is the trailer. These are the director's cut. Or press ? and drive with the keyboard.
Every job, project and post, year by year
49 milestones since 2023
What has my attention this month
Last updated October 2026
The stack and tools behind the work
From Postgres to the font on this page
Experiments you can poke at
Break an offline sync queue on purpose
Notes from shipping real systems
5 essays · RSS available
greg@portfolio:~$ ls -a
Some things here aren't linked anywhere. Open the devtools console, or switch tabs and come back.
Now
Currently building
End-to-end SaaS for a real safari operator: bookings, costing engine, CRM, itinerary builder, invoicing and supplier management, with AI-driven automation (WhatsApp concierge replies, passport and receipt OCR, itinerary drafting) and nine scheduled jobs.
Read the case studyLatest commit
feat(blog): add a test that shares your assumption cannot catch it
Myportifolio ·
Recently active
Get in touch
A system that has to stay up, a product that needs shipping, or a role on your team. A few lines about the problem is plenty; I reply within a day, from Nairobi (EAT, UTC+3).