Surya Sikha Rej

Software Engineer at OLX Indonesia working on search, discovery, and relevance systems using Elasticsearch/OpenSearch.

Experienced in building scalable backend services with Java and Spring Boot, improving search performance, relevance, and monetization. Interested in search engineering, distributed systems, and solving large-scale backend challenges.

Software Engineer OLX Indonesia (Search, Discovery and Relevance)

• Optimized end-to-end search performance and ranking pipelines for OLX Indonesia, improving relevance while scaling high-

volume query traffic across Elasticsearch/OpenSearch based systems.

• Designed and implemented premium ad slot placement for paid dealers within search results, directly contributing to monetization growth and increased platform revenue.
• Owned and maintained the complete search backend ecosystem, ensuring highly relevant, location-aware ad retrieval and ranking for millions of user searches.
• Led backend modernization initiatives by migrating multiple production microservices from Dropwizard to Spring Boot,

improving maintainability, scalability, and developer productivity.

• Built and optimized scalable backend services and microservices using Spring Boot, focusing on performance, reliability, and low-latency distributed systems.
• Worked extensively on search infrastructure using Elasticsearch/OpenSearch, solving complex search relevance, ranking,

indexing, and query optimization challenges.

• Developed an in-house email sending and tracking platform for the marketing team using Gmail OAuth and Google Graph APIs,

enabling campaign automation and tracking capabilities.

• Collaborated closely with product and business teams to enhance search experience, dealer visibility, monetization strategy, and overall platform engagement.