Senior Software Engineer - Backend
Global payments company providing localized payment methods and merchant payment services.
About Boku, Inc.
Boku, Inc. operates a global payment network connecting merchants with localized payment methods. Its network reaches more than 7 billion consumer payment accounts in over 90 countries.
Skills
Candidate Availability
Required and preferred rules are kept separate and reflect the wording in the original posting.
About the Role
Design and build greenfield, production-grade backend services for payment, payout, card processing, FX, and treasury products. Develop APIs and resilient distributed systems, optimise performance and data access, and build observability, CI/CD, container configuration, and security controls. Contribute React components for operational and merchant-facing interfaces when required.
Requirements
- 5+ years of backend engineering experience
- Deep expertise in Java and Spring Boot, including Spring MVC, Spring Data, and Spring Security
- Experience building and operating high-throughput, high-availability distributed payment or financial-services systems
- Understanding of payment architecture, including idempotency, exactly-once delivery, reconciliation, and settlement
- Experience with PostgreSQL or MySQL and Kafka, RabbitMQ, or equivalent messaging systems
- Familiarity with Docker, Kubernetes or EKS, and CI/CD tooling such as GitHub Actions
- Experience with PCI DSS-compliant system design and secure coding practices
- Experience with LLM-powered production features, prompt engineering, tool or function calling, and structured API outputs
- Experience with agentic workflows, including retries, failure handling, and human-in-the-loop checkpoints
- Familiarity with MCP or similar tool-use frameworks
- Bachelor's degree in Computer Science, Engineering, or equivalent practical experience
Responsibilities
- Design and build production-grade Java and Spring Boot services with high throughput, low latency, and high availability
- Implement and evolve RESTful, gRPC, MCP, and event-driven APIs for payment initiation, callbacks, reconciliation, and settlement
- Build resilient services using circuit breakers, retries, idempotency, graceful degradation, observability, and telemetry
- Optimise service performance through profiling, load testing, and SQL and NoSQL data-access design
- Provide code reviews and guidance to colleagues and offshore development teams
- Build new payout, card processing, FX, treasury orchestration, and cash forecasting components
- Contribute to PCI DSS-compliant design, sensitive-data handling, audit logging, and access control
- Contribute React components for internal tooling, operational dashboards, and merchant-facing interfaces
- Integrate FX data sources and contribute to cash-position and FX-exposure monitoring where required
- Implement structured logging, distributed tracing, metrics, SLOs, SLAs, and alerting
- Set up CI/CD pipelines, Docker and EKS configuration, and code-quality gates using SonarCloud and SAST