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HalxDocs

Product Engineer · Systems Builder · Full-Stack Infrastructure

I build backends and web products that actually ship.

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I work with founders and growing teams to design, architect, and ship production-grade software — backend systems, APIs, fintech infrastructure, full-stack web products, and developer tooling.

I don't just close tickets. I think about the system, make the hard call early, and build things that hold up when real users show up.

Build fast. Build clean. Build systems that last.


What I actually do

  • Design and build production backend systems from scratch — auth, wallets, ledgers, payment flows
  • Architect APIs that scale with traffic and stay maintainable as teams grow
  • Ship full-stack web products end to end — frontend, backend, database, deployment
  • Debug and stabilise existing codebases that are falling over in production
  • Build developer tooling that solves real workflow problems
  • Make sound technical decisions early — so you don't pay for them later

Tech stack

Frontend

React Remix TypeScript JavaScript Tailwind CSS Three.js HTML CSS

Backend & Infrastructure

NestJS Node.js Go Express

Databases

MongoDB PostgreSQL MySQL Firestore

Cloud & Deployment

Vercel Render Firebase GitHub Actions

Mobile

Flutter


Selected work

Project Description Link
contextpack CLI that bundles any codebase into a single LLM-ready file. Stop copy-pasting files into Claude or ChatGPT one by one. npm npm · github
lazydb Keyboard-driven terminal UI for databases — like lazygit but for SQL. Supports Postgres, MySQL, SQLite. Built in Go with bubbletea + lipgloss. github
Fintech Banking Backend Production NestJS backend for a Nigerian mobile banking app — phone-number-first auth, OTP with brute force lockout, atomic wallet creation, full ledger system split into focused modules. Strict TypeScript throughout. private
Wedding Invitation App Full web app with animated envelope opening, personalised guest links, live RSVP dashboard, WhatsApp sharing, and CSV export. Built for a real wedding. private
Norah's Beauty Hub Full-stack Nigerian e-commerce platform — live debounced search, Cloudinary uploads, responsive admin dashboard with analytics, full auth system. private
BiblePlus Backend Node.js/TypeScript backend for a Bible quiz app. Rebuilt the daily quiz service with a deterministic seed algorithm — same question for every user on the same day, zero database dependency for selection. Fixed two production crashes on Render. private
JSONStack High-performance JSON processing tool. Handles 400k+ lines with optimised parsing and rendering. jsonstack.dev
Cortex Extensible AI-powered analysis platform for structured processing and intelligent workflows. corte-x.vercel.app
AIDevHelper Chrome extension that improves developer workflow speed without context switching. github
Email Verifier API Lightweight, production-ready email validation API built in Go. render

How I think about production systems

Things I've learned from actually shipping and maintaining systems under real conditions:

  • Validate environment variables at startup. Not buried in a function — at boot. If something is required, the service should tell you exactly what's missing, not die with a cryptic trace.
  • Never rely on files for secrets in PaaS deployments. Render, Vercel, Railway — they don't have your gitignored files. Serialise secrets to environment variables.
  • Determinism is a feature. For scheduled jobs, daily content, seeded selection — design for it explicitly. Don't rely on the runtime to give you consistency it was never designed to provide.
  • Store money in the smallest unit. Kobo, cents, pence. Never floats.
  • Atomic operations for anything financial. MongoDB transactions exist for a reason. Use them.
  • Split services by responsibility, not by size. A ledger service that does money movement, querying, reconciliation, and helpers in one file is a liability. Split it early.

Engineering philosophy

Great products are systems, not features.

Clean foundations > flashy launches. Long-term value > short-term hacks.

The best time to make the right architectural call is before you have 50k users and a deadline. I try to make those calls early.


Availability

Open to backend contracts, full-stack product builds, fintech engineering, and startup partnerships.

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