kloysoft

Okai Yeboah Software Engineer

I build backend systems and mobile applications, from interest-rate derivative platforms to cross-platform mobile apps. Open to freelance work and consulting.

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Okai Yeboah

Okai Yeboah

Software Engineer

Now
CalBank · Accra
Focus
Backend & mobile app development
Previously
Turntabl → Morgan Stanley
Since
2020

Where I focus

ARCHITECTURE
01

Backend systems

Backend services and data flows for banking and trading systems, similar to the interest-rate derivatives technologies I worked on at Morgan Stanley. I build for correctness, reliability, and security compliance.

Scala Kafka Git
dns
MIDDLEWARE 02

Data integrity

Managing data change requests in compliance with privacy and data quality policies to keep systems secure.

Zero-compromise migration
speed 03

Workflow debugging

Troubleshooting and resolving system integration and workflow errors to minimize downtime and disruptions.

Minimized downtime
SYSTEM_INTERFACE 04

End-to-end delivery

I take responsibility for features from the database to the screen. I ship mobile applications alongside the backend services that support them.

north_east

Products

What I'm building

KloySoft isn't only client work. I design, build and operate my own products — the same rigor, from domain model to deployed service.

hub

Live · gracegraph.kloysoft.com

GraceGraph.

Relationship-first church management. Your membership list becomes a living relationship graph — directory, groups, check-in and care follow-up in one place, so no one slips through the cracks between Sundays.

  • Fast Sunday check-in — first-time guests are captured the moment they walk in.

  • Care that closes the loop — an explainable follow-up queue: who needs a visit, why, and who is making it.

  • One living graph — people, groups and attendance connected, insight with evidence attached.

Open GraceGraph Book a demo

Care · Follow-up queue

Demo data
AM

Ama Mensah

Due today
KO

Kwabena Osei

Scheduled
EB

Efua Boateng

Queued
Every guest followed up within the week
school

Early access

Adesua.

Fast, reliable school operations for Ghanaian basic schools — daily attendance, assessment entry and absence follow-up, optimized for the teacher's day.

  • Registers in seconds — mark, submit, done, with every class still outstanding visible live.

  • Corrections done properly — absences and fixes flow through a structured correction workflow, never overwritten silently.

  • Trusted learner records — enrolment, classes and guardians, with privacy consent built in.

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Attendance · Today

Sample data
B7

Integrated Science

Submitted
B9

Mathematics

Not submitted
B4

Creative Arts

Submitted
Registers, learners and corrections — one system
Get in touch

Have a project in mind?

Tell me what you are building. It can be a core banking backend, an integration, or a mobile application.

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