Closed testing on Google PlayA super-app for Guinea: payments, chat, rides, shopping and more in one app, for people and for the businesses that serve them.
For the people using it
OMNIA was made for a major client in Guinea as one app for daily life: a wallet linked to local banks, chat and calls, rides and parcels, bills, a shop, gold and metals, EV charging, and a way to invest in the company. Businesses run on it too, with their own tools for merchants, distributors and selling points.
Where I came in
The Android app had grown with API calls, logic and UI in the same files. I joined SDLC Corp as a Kotlin developer to help turn it around while features kept shipping: split it into modules, make it more secure, improve the UI and UX, and bring Claude into the project.
A wallet tied to real bank accounts has to know who is paying. KYC had to be strict without losing people at sign-up.
An individual and four business roles each need their own screens and rules, inside one app.
Delays and crashes are seen at the very top.
Download size and stability decide whether people keep an app like this installed.
Individuals, merchants, distributors, sub-distributors and selling-point managers each get their own home and navigation.
A team effort: the release went from over 350 MB to under 110 MB.
A team effort across low-end and current phones.
English, French and Chinese throughout the app.
Sign in
The role picked at sign-up decides the navigation you get.
Sign in with a mobile number, with Guinea's +224 ready by default and a PIN for every payment after that. Choosing a role at sign-up decides which app you get.
KYC
Liveness runs on the phone with ML Kit before the selfie is matched to the ID.
Upload an ID card, passport or licence, then take a selfie with random live challenges: blink, turn your head, smile. Business roles can't enter the app until both steps are done.
Wallet
Card top-ups go through Stripe; balances are in Guinean francs.
Link a local bank, top up, pay anyone by phone, wallet ID or QR, request money and withdraw to an account, with every transaction filterable.
Pay
The fee is shown before you pay, never after.
Type the amount, add a note, see the fee before you confirm, then enter your PIN. The receipt shows who was paid and when, with a button to pay again.
Chat
Each message gets its own AES-256 key, wrapped with the recipient's RSA key.
One-to-one and group chat with photos, documents, location and contacts, voice and video calls, and money sent inside the conversation. Chats back up to Google Drive.
Omniia Brain
Voice in, voice out, and real actions in the wallet.
Ask by text or voice and Omniia Brain sends money, requests it, withdraws to your account or pays a bill, confirming each step in the conversation.
Rides
One booking flow for rides, parcels and reservations.
Choose a ride, a parcel or a reservation, see the fare, and pay in cash, by QR or from the wallet. Drivers take the trip in their own app.
Invest
Each round has its own price, bonus and lock-in.
Buy OMNIIA, the company's own token, straight from the wallet. Each round has its own price, bonus and lock-in, and a short tour explains holding and quarterly returns before anyone invests.
Layer 1
Jetpack Compose screens in OMNIA's own design system, with a separate navigation graph for each role.
Layer 2
Each service is its own feature with data, domain and presentation layers, wired with Hilt, so the wallet and chat can change without touching each other.
Layer 3
REST APIs for the money, sockets for anything live, a media server for calls, and Stripe and Maps for the rest.
Live rates and charts, buy and sell gold at a locked price, track a portfolio, and pay for a ride with it.
Gold, silver, bauxite, iron, nickel and more, each with its own live chart.
Find a station, pick a connector, charge by time or by percentage and pay from the wallet.
One-to-one and group calls, voice or video, from any chat.
Send or receive a package: addresses, type, weight and delivery instructions.
Prepaid and postpaid electricity, by tapping or by asking Omniia Brain.
The largest feature in the code: a store for customers, and sales and products for merchants.
A short tour, then buy the company's token from the wallet, round by round.
Phone recharge, and a virtual debit card linked to the wallet.
OMNIA also runs at the counter. A point-of-sale app on an Android POS device pairs with an infrared palm-vein camera: the shop rings up the sale, the customer holds out a hand, and the payment comes from their wallet.
Parcels take the same path, from the pickup address to the door.
Wallet, chat, calls, taxi, shop, KYC and the rest each live in their own folder with data, domain and presentation layers, so one team can work on chat without breaking payments.
The RSA key pair is made on the phone and only the public half is shared. Each message is sealed with a fresh AES-256-GCM key, and both people can verify the encryption with a QR code or a 60-digit number.
RSA-2048 + AES-256-GCMML Kit checks for a live face on the phone, with random challenges, before the selfie is sent to be matched against the ID.
The role chosen at sign-up picks the navigation graph and the bottom bar, so each business sees only what it needs, and business roles must finish KYC first.
OMNIA is in closed testing on Google Play, with iOS and the web alongside it.
Wallets, bank top-ups, PIN-protected payments and KYC with a liveness check.
Chat, calls and live updates over sockets, encrypted where it matters.
Help splitting it into clean features without stopping the work that keeps shipping.
Modern Kotlin, Jetpack Compose and clean architecture, at super-app scale.