Leandro Magbanua

LT

A sensor on our rooftop water tank that warns the family group chat before the tank runs dry mid-shower, which used to happen every long weekend.

TS

An Elo ladder for my in-laws' Sunday mahjong table, built to settle who is actually the best — it settled that argument and started four new ones.

A COBOL interpreter that implements just enough of the language to run our nightly batch's programs on my laptop — written so I could finally read them properly.

A post-authorization rules service and review queue that lets a card operations team change fraud checks the same day instead of waiting for a release.

Two years as designated custodian of a COBOL nightly batch that posts branch transactions — documenting it, watching it, and changing as little as possible.

Built the partner-facing API a Singapore remittance company uses to onboard payout partners, working from Manila on a team spread across three time zones.

Put a web intake front end on a 2003 loan admin system whose database schema was frozen until fiscal year-end — without touching a single existing table.

Moved monthly account statements off an RPG job on an AS/400 the vendor had stopped supporting — with a parallel run that took three attempts to pass.

Replaced a spreadsheet-and-stored-procedure reconciliation process at a mid-size bank with a service that matches switch settlement files against core postings overnight.