We are looking for a Senior Backend Engineer to join our Card Issuing Team, which builds the APIs and infrastructure that let businesses launch and manage their own card programs across Southeast Asia. You will take ownership of a core domain within our live production platform, setting the technical direction and raising the engineering bar. This role suits someone who has run high-stakes production systems and is comfortable making architectural decisions with incomplete information.
What You Will DoLead the technical design (writing RFCs) for high-availability money-moving systems, making critical decisions on scalability, consistency, and failure handling.
Take full technical ownership of a core domain (e.g., authorization, settlement), balancing new product features with technical debt and reliability.
Build and scale RESTful microservices, ensuring strict idempotency, reconciliation correctness, and security (PCI DSS) in every financial flow.
Drive technical integrations with card networks, payment processors, and third-party providers.
Partner with Product, QA, and Ops to break down ambiguous problems into deliverable work, while mentoring junior/mid-level engineers.
Pioneer the use of AI tools and agents to safely automate engineering and operational workflows within a regulated payments environment.
5+ years of backend engineering, with a strong track record of designing, launching, and operating high-scale or financial production systems.
Expert-level Golang with deep experience building microservices deployed on modern cloud infrastructure (Docker, Kubernetes, CI/CD).
Advanced SQL skills (MariaDB/MySQL), including query optimization, transactions, locking, and live schema migrations.
Excellent debugging skills, sound judgment on technical trade-offs, and the ability to write clear technical documents to drive team alignment.
Hands-on experience using AI-assisted development tools (like Claude or Cursor) to accelerate delivery without compromising code quality.
Domain Knowledge (Bonus): Prior experience with payments, card issuing, settlement systems, network integrations (Visa/Mastercard, ISO 8583), or PCI DSS compliance is a strong plus.
Skills Required
- 5+ years of backend engineering experience
- Experience designing, launching, and operating high-scale or financial production systems
- Expert-level Golang experience
- Deep experience building microservices on modern cloud infrastructure
- Experience with Docker, Kubernetes, and CI/CD
- Advanced SQL skills with MariaDB or MySQL
- Experience with query optimization, transactions, locking, and live schema migrations
- Excellent debugging skills and sound judgment on technical trade-offs
- Ability to write clear technical documentation and RFCs
- Hands-on experience with AI-assisted development tools such as Claude or Cursor
- Payments, card issuing, settlement systems, network integrations, or PCI DSS compliance experience
What We Do
Based in Singapore, StraitsX provides regulated stablecoin payment infrastructure and solutions, issuing XSGD, XUSD, and XIDR. It enables secure, compliant, and programmable cross-border transactions and settlement for financial institutions, fintechs, and exchanges, leveraging blockchain technology to drive payment interoperability and bridge the gap between traditional finance and the digital economy.
