Nelson Odo
Senior software engineer. Payments, POS and AI-powered products.
I've spent nine years building web, mobile and backend systems. At Habaripay (Squad, a GTCO company) I went from mobile to frontend to backend to team lead, and led the POS platform that processes over $3M a day. Today I build the hiring product at a Berlin startup, and I take on a small number of freelance and contract projects.
Chibbaa.
An online store platform for merchants: storefront, orders, delivery and team in one place, on web, iOS and Android.
Everything a shop needs to sell online
Merchants pick a template, list products with video, and take orders. Customers share wishlists and pay through multiple gateways or an in-app wallet.
The whole thing, end to end
- Storefronts and store templates
- Orders, delivery and team roles
- Split payments and wallet
- Vendor and admin tools
- iOS and Android apps
Production stack
- React and TypeScript
- Node.js APIs
- Flutter mobile apps
- Payment gateway integrations
Other things I've shipped
Squad POS platform
The POS platform behind Squad's card terminals, processing over $3M a day. I led it from the first commit.
- Card processing over NIBSS (ISO 8583, EMV) on Topwise and Morefun terminals
- Processor failover and double-debit prevention
- Fixed webhook delivery when ~47% of dispatches were failing
- Self-hosted realtime messaging: p99 8 ms across 10k terminals
- SDKs, WordPress plugins and npm packages for partner integrations
Squad Merchant App
The merchant app for the Squad gateway: transfers, airtime and data, KYC, payment links and NFC contactless payments. I created it and wrote nearly all of it.
iClass
A learning app for primary, secondary, JAMB and SSCE students, with encrypted lesson delivery and a CBT exam engine holding 40,000+ questions.
Gateway dashboard & API
The Squad merchant dashboard, admin console and public developer API (refunds, disputes, virtual accounts, payment links), plus an e-commerce platform that grew to 2,500+ vendors and 100,000+ customers.
Where I've worked
AMA
Senior Frontend Engineer. Building the core product for a Berlin hiring startup: talent discovery, pipeline tracking and outreach. Leading frontend architecture and performance work.
Habaripay
Team Lead / Senior Software Engineer. Mobile → frontend → backend → team lead. Led the Squad POS platform ($3M+ a day), built the merchant app, dashboard and developer API, reviewed 835+ merge requests and mentored junior engineers.
Oozou
Fullstack Developer. Refactored 70% of a legacy codebase and added Elasticsearch for complex search, cutting response times by 15%.
Eazzy Eats, Pacuss Global
Web and mobile developer. A food delivery app with live order tracking, and a school management system used by 8+ schools.
What I work with
- React, Next.js
- TypeScript
- Remix, Vue, Svelte
- Tailwind CSS
- Flutter
- React Native
- Kotlin
- Electron
- Node.js
- Go, PHP, Python
- REST, GraphQL
- Microservices
- PostgreSQL, MySQL
- MongoDB, Firebase
- Elasticsearch
- CI/CD, Jest
Tell me about your project.
A new build, a feature that's stuck, or an app that needs to be faster. Send a few lines and I'll reply within a day.
Prefer LinkedIn? Message me there.