Senior Backend Engineer - Recommendation Systems (Contractor)

OPPO; Palo Alto (CA); On-site; USD 82,656 - 165,312; Full time

Job summary

OPPO US Research Center is seeking an experienced backend engineer to design and optimize backend services for high-traffic applications such as the App Store, Global Search, and Game Center. You will build scalable, reliable systems that serve millions of daily users.

The role focuses on Java-based services (Spring / Spring Boot), multi-level caching, and data pipelines with Redis, Elasticsearch, and Kafka.

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.

Responsibilities

• Design and implement backend services for recommendation and search with 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.

Skills

Java

Spring Boot

Distributed systems

Caching

Redis

Elasticsearch

Kafka

Multithreading

Teamwork

Communication

Education

BS/MS in CS

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 operating high‑traffic, high‑concurrency services

Benefits

OPPO is proud to be an equal opportunity workplace. We are committed to equal employment opportunity regardless of race, color, ancestry, religion, sex, national origin, sexual orientation, age, citizenship, marital status, disability, gender identity or Veteran status. We also consider qualified applicants regardless of criminal histories, consistent with legal requirements.

The US base salary range for this contractor position is 60-120/hour. Our salary ranges are determined by role, level, and location.