Payments
3+Years in banks
- Rails
- Instant payments, RTGS, mobile money
- Hubs
- Bills, utilities, school fees
- Also
- Central-bank reporting, loans
By day I connect Tanzanian banks to the national payment rails. I also set up the servers, the pipelines and the monitoring behind them, and I stay until they run. After hours I run Kemosabe, whose app Swala Kazi is live in Dar es Salaam.
- 3+
- years in production
- 23
- systems built or shipped on teams
- 3
- countries with users of my work
- 1
- company founded, product live
Three jobs. One person.
Most teams hire these separately. I do all three, so nothing falls between them.
Operations
OpsI run what I ship
- DevOps
- Containers, pipelines, releases
- Admin
- Linux servers, databases, access
- Watch
- Monitoring, backups, alerts
Products
1Company, live
- Mine
- Swala Kazi, home services
- Schools
- Student, staff and fee systems
- Also
- Property, inventory, parking
Swala Kazi is live in Dar es Salaam.
My company’s app for booking a vetted cleaner, cook or nanny. You pay by mobile money, and the money waits until you confirm the job is done.
- Find a helper near you
- Pay into escrow
- Confirm, then the money is released
Price a booking.
Type a job the way you’d say it, in English or Kiswahili. This is Swala Kazi’s real pricing: 30-minute steps, a TZS 6,000 minimum and a 15% service fee.
Usafi · Cleaning · 4 h at TZS 8,000 an hour
- Helper’s time
- TZS 32,000
- Service fee, 15%
- TZS 4,800
- You pay
- TZS 36,800
Held by a licensed payment partner until you confirm the job is done.
The receipts.
Selected work from 23 systems. Clients are described rather than named, because that’s part of the job.
Add yoursC. MATABA
DAR ES SALAAM, TANZANIA
Swala Kazi
2026Kemosabe, my company
Book a vetted cleaner, cook or nanny in Dar es Salaam, pay by mobile money, money held until the job is done.
Instant payments gateway
2024A Tanzanian commercial bank
Customers send money to any bank or wallet in seconds through the national switch.
RTGS message translation
2024A Tanzanian commercial bank
High-value transfers move between core banking and national settlement without rekeying.
Production operations
OngoingBanking and my own company
Servers, deployment pipelines, monitoring and administration for systems that cannot go down.
School and university management
2026Institutions abroad, on a team
Students, staff, classes and records in one platform for schools and universities.
School fee payments
2026School service providers
Parents pay fees through the channels they already use, and schools see it reconciled.
Loan platform
2023A tier-1 East African bank, through a consultancy
Applications, approvals and recovery in one place instead of spreadsheets and email.
e-Parking
2023A national parking programme, on a team
Plate recognition and automated gates at malls, markets and transport hubs.
Traffic enforcement
2023A Southern African traffic authority
Maintained the camera-based system officers use on the road.
Property and inventory apps
2025Kemosabe, my company
Rent and tenants on the phone, stock and sales on the desktop.
TOTAL SYSTEMS23
STATUSSTILL RUNNING
ASANTE. KARIBU TENA.
Still shipping.
6,184contributions on GitHub in the last twelve months.
See my GitHub- November 2025: 98 contributions
- December 2025: 67 contributions
- January 2026: 110 contributions
- February 2026: 24 contributions
- March 2026: 63 contributions
- April 2026: 110 contributions
- May 2026: 54 contributions
- June 2026: 64 contributions
- July 2026: 109 contributions
- August 2026: 36 contributions
- September 2026: 1225 contributions
- October 2026: 3982 contributions
- November 2026: 242 contributions
Next stop, everywhere.
My goal is to work with teams in many more countries. Money crosses borders now, and so do the schools, shops and companies that depend on it.
I work remotely from Dar es Salaam, in English and Kiswahili, and from UTC+3 I share a working day with Africa, Europe, the Gulf and India. My work already has users in three countries.
Dark tiles are in working hours right now, and they move with the clock. Orange is home.
Bring me to your countryYour working day, next to mine
- Go
- Java
- Spring Boot
- TypeScript
- NestJS
- Next.js
- React
- Flutter
- Django
- Laravel
- PostgreSQL
- Linux
- Docker
- CI/CD
- Monitoring
Questions.
Who is Chrisostome Mataba?
A software engineer in Dar es Salaam, Tanzania, who builds payment integrations for banks, runs production systems, and founded Kemosabe, the company behind the Swala Kazi app.
What does Chrisostome build?
Bank payment integrations (instant payments, RTGS, bill payments, central-bank reporting), school and university management systems, mobile apps in Flutter, and back-office platforms.
Can Chrisostome run the system after building it?
Yes. DevOps and administration are part of the work: servers, deployment pipelines, monitoring, backups and access control.
Does Chrisostome work with teams outside Tanzania?
Yes. The goal is to work with teams in many more countries, remotely from Dar es Salaam (UTC+3), which shares a working day with Africa, Europe, the Gulf and India.
Is Chrisostome available for work?
Yes, for payment integrations, platforms, school systems and apps. Email [email protected].
Karibu.
Tell me what you need built, or what you need kept running.
[email protected]- Based in
- Dar es Salaam (UTC+3)
- Speaks
- English, Kiswahili