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Yerikho William Tasilima

Projects / evidence index

Engineering decisions, constraints, and proof.

01 published

Case studies are published only when their claims, limitations, and evidence boundary are explicit.

OhMyPos cashier interface showing branch selection, product cards, an active two-item order, and payment-method controls.
Cashier workflow with branch-scoped availability, active order detail, and payment-method selection.
Published case study/ohmypos

OhMyPos

30 concurrent settlement requests against a single payable resolved into exactly 15 successes and 15 conflicts — final balance Rp0.00, zero server errors.

A multi-branch POS system built to keep sales, inventory, and financial ledgers consistent under concurrent transactions.

  • TypeScript
  • NestJS
  • Prisma
  • PostgreSQL
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