Kobo Ledger
Rebuilt the balances engine from a fragile MySQL trigger stack into a Go service backed by Postgres and a Kafka event log. Introduced deterministic reconciliation, per-currency accounts, and a settlement engine that closes books in under 4 minutes at day end.
What you'll leave with.
Zero unreconciled cents across 14 months of production
Books close in <4 min at day end (down from 3 hours)
Dropped a 22-service microservices sprawl to 6 well-owned services
Migrated 190M rows with zero downtime and no double-charges
How the engagement unfolds.
Audit
Two weeks reading the code and the incident post-mortems before touching anything.
Strangler
Wrote the new balances engine alongside the old one; ran them in parallel for 6 weeks.
Cut-over
Migrated one wallet type at a time. Rollback plan for each. Zero rollbacks used.
Handover
Runbooks, on-call rotation, a 3-day workshop for the internal team.
You'll get the most from this if…
- Payments and lending teams with an accounting subsystem you're scared to touch
- Series-A/B fintechs where the ledger is now the bottleneck
Every engagement includes.
- Full ownership of the ledger subsystem
- Weekly demo · monthly written report
- Runbooks and on-call handover at end of engagement
What clients say after.
“Chinedu rewrote our ledger without a single reconciliation error in production. That has never happened before, or since.”
Answers before you book.
It always starts with a 30-minute intro call — free, no pitch. I use it to see if the work you need lines up with what I do. If we're a fit, I send a written scope within 3 days.
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One-Week Architecture Review
A structured week reviewing your codebase, incidents and roadmap — you leave with a 30-page report and a 90-day plan.
Fractional Tech Advisory
A monthly retainer for founders and CTOs who want a senior engineer on tap between the big decisions.
Start with a 30-minute call.
Contract-to-hire, embedded, or advisory. Full ownership handover with runbooks.