Senior Software Engineer II, Zalopay

Payment Core Platform builds and operates Financial Core of Zalopay, serving as the central component of one of Vietnam's leading Payment Platform. Our primary responsibility is to handle various transaction processing and fund flows, including activities such as top-ups, withdrawals, transfers, and payments. With a focus on meeting stringent technical requirements, our system ensures a seamless and secure payment experience by delivering exceptional performance in terms of throughput, latency, availability, and scalability.

Additionally, our team owns critical financial domains, including Accounting, Finance, and Business Operations. This involves managing user and partner funds, as well as maintaining daily records of Zalopay transactions in accordance with accounting standards.

Through our efforts, Zalopay provides instant payment, money transfers, expedited operations, and top-level security measures. As a result, we play a crucial role in Zalopay's commitment to advancing a cashless society, delivering a wide range of services and enticing offers to our users.

Responsibilities

You will:

- Design, build, and maintain large-scale services, data pipelines, tooling, and systems to ensure a direct business impact in Zalopay’s mission-critical business domains including Product, Merchant, Accounting, Finance, and Business Operations.

- Write clean, efficient, and well-documented code using best practices.

- Debug and resolve complex issues that may arise in the system and address performance bottlenecks.

- Collaborate with cross-functional teams, including product managers, designers, and other engineers to define requirements and deliver high-quality solutions.

- Keep up-to-date with the latest technologies and trends in the industry and identify opportunities for improvement.

- Work in an Agile & collaborative environment involving different stakeholders.

- Be able to work in a high-pressure environment.

- Oversee end-to-end design and integration of our Payment Platform to meet highest standard, ensure application and fund security.

- Eliminate technical debt across core Zalopay system

- Have a Bachelor's or Master's degree in Computer Science, Software Engineering, or a related field.

- Have experience with distributed transaction algorithms such as TCC, SAGA, Two-Phase Commit.

- Have extensive experience working with databases and database transaction.

- Have in-depth knowledge of database design principles and performance optimization techniques.

- Have experience with distributed caching such as Redis, distributed locking such as ZooKeeper, and distributed event streaming platforms such as Kafka.

- Write high-quality & maintainable code. We work mostly in Java. However, languages are tools and we care more about your mindset & general engineering skills.

- Have implemented and delivered distributed systems on a large scale.

- Have experience in tracing system problems.

- Have experience in API design followed wellknown standard such as Google API Design

- Must have experience in state management and apply infinite state machine in practice

### Nice to Have Skills

- Experience with Java technologies: Spring Boot, Reactive Programming, Concurrent/Parallel Programming, Messaging Frameworks, etc.

- Experience in optimizing JVM.

- Experience with financial-related platforms/products is a plus.

- Knowing how to work with K8S or cloud services.

- Have a strong understanding of consensus algorithms, such as Paxos, Raft, or Practical Byzantine Fault Tolerance (PBFT).

- Good at English communication, both verbal and written