Backend engineer, 13 years, most of it on payment systems a country runs on. Node.js and TypeScript. Ulaanbaatar, UTC+8. Remote as a contractor or through an EOR.
Almost all of it is in employer repos. The contribution graph counts those commits without naming them. The public part:
- UN-OCHA/hpc-api and hpc-api-core: the API behind FTS, the UN's public record of humanitarian funding. Two years, 2023 to 2025, remote contractor.
- Qpay Mongolia, 2019 to 2022: one of the tech leads who rebuilt the country's largest payment processor from a Java and Oracle monolith into 40+ Node.js services on Kubernetes, 2M users, 70,000 merchants. Card vault on our own HSM, PCI-DSS Level 1. Private repos.
- A QR payment switch between banks and wallets, 2022 to 2023: ISO 8583 codec written from the spec, live pilot in 14 months. Private repos.
TypeScript, Node.js, PostgreSQL, Redis, Kubernetes, React. Python and Java where the work needs them. ISO 8583, EMVCo QR, PCI-DSS.