Oliver Zou

Experience

1. Sr Full Stack Developer

   Sprint

   Jun 2020 — Present

   Developed Kafka producers and consumers using Spring Kafka and Java 17, enabling real-time event-driven communication across microservices.•Utilized record classes to define concise, immutable Kafka message payloads for better serialization and schema clarity.•Applied pattern matching for instanceof in Kafka consumer handlers to streamline message type resolution and reduce error-prone casting.•Employed sealed interfaces for Kafka event models to enforce strict control over allowed message types in a domain-specific event hierarchy.•Leveraged text blocks for clean and readable Kafka configuration templates and test payloads, improving maintainability.•Ensured robust error handling and retry logic in Kafka consumers, with structured logging and observability powered by Spring Boot Actuator.•Integrated Kafka with PostgreSQL-based services for durable event sourcing and CDC (Change Data Capture) scenarios.•Implemented record classes to simplify immutable data transfer objects (DTOs) and improve code readability.•Adopted switch expressions with multiple case labels and yield, improving control flow clarity and maintainability.•Migrated legacy code using anonymous inner classes to lambda expressions and text blocks for cleaner configuration and SQL queries.•Integrated with Spring Boot 3 and Java 17, ensuring full compatibility with the LTS platform and leveraging the latest language enhancements.•Built real-time streaming features with Flux, enabling efficient backpressure handling and reactive data delivery.•Used Reactor Flux and Mono for composing non-blocking operations in a Spring WebFlux backend.•Designed reactive REST APIs using Vert.x Web with integrated RxJava-style handlers for improved scalability.•Integrated Hibernate/JPA for ORM and optimized SQL queries for performance across PostgreSQL and MySQL databases.interoperability.Containerized applications using Docker and deployed on Kubernetes clusters as part of CI/CD pipeline.