## Company Overview ONSQUARE INC is a Korea-based Fintech and AI-based SaaS startup. It develops payment infrastructure and AI Agent-based user tools for the global market, operating with a distributed team structure across Korea, Canada, and Vietnam. ## Responsibilities - Design and develop international payment and remittance infrastructure - Implement escrow payment systems with milestone-based settlements - Build KYC/AML systems - Integrate payment gateways (Stripe, Toss Payments, Airwallex, etc.) - Handle compliance requirements for international remittance services - Manage payment security and fraud/anomaly detection systems ## Requirements - Minimum 5 years of senior backend development experience - Hands-on experience with Node.js / NestJS or equivalent backend frameworks - Experience in PostgreSQL-based data modeling - Experience operating AWS-based infrastructure - Mandatory experience in fintech/payment system development - Ability to read and write technical documentation in English - Currently residing in Ho Chi Minh City or willing to relocate