Senior Backend Engineer - Recommendation Systems (Contractor)

Job description

Join OPPO US Research Center’s core team to develop and optimize backend services for high-traffic products (App Store, Global Search, Game Center). You’ll build scalable, reliable systems that serve millions of daily users. Key Responsibilities: - Design and implement backend services for recommendation and search with a focus on low latency and high availability. - Implement multi-level caching and optimize data access patterns. - Build, monitor and tune data pipelines and indices using Redis, Elasticsearch, and Kafka. - Develop production-quality Java services using Spring / Spring Boot and collaborate on deployments and incident response. - Work cross-functionally with MLE, product, SRE, and data teams to deliver features and improvements. Requirements: Minimum Qualifications: - BS or MS in Computer Science or a related field. - 4+ years building backend systems in Java (Spring / Spring Boot). - Solid knowledge of multithreading, caching strategies, and distributed systems. - Hands-on with Redis, Elasticsearch, and Kafka. - Good communication, problem solving and teamwork skills. Preferred Qualifications: - Experience in recommender or search system backends. - Experience opera...