Senior Backend Engineer - Recommendation Systems (Contractor)

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 operating high-traffic, high-concurrency services.

Benef