Senior Backend Engineer (Search, Ranking Service)
Core
Designing, serving, and operating backend search systems for diverse domain collections (news, places, stocks, sports, music, movies) to improve search quality and ranking.
Role type
Senior Backend Engineer (Search, Ranking Service)
Builds
Search architecture, indexing/retrieval structures, ranking models, and production backend services for a mobility AI platform.
Domain
Mobility AI / Search & Recommendation Systems
Deliverable
production ML models | product features
Required skills
Python, Java, Kotlin, API/backend service design and operation, search/recommendation/ranking domain expertise, log and metric-based analysis, system architecture design and standardization
Preferred skills
OpenSearch, Elasticsearch, MongoDB Atlas Search, Semantic Search, Embedding, Reranker, Vector Search, Hybrid Search, ranking model development, nDCG/MRR/recall/CTR metric operation, AWS, Kubernetes, Helm, automotive/voice assistant experience
Technologies
OpenSearch, MongoDB Atlas, Python, Java, Kotlin, AWS, Kubernetes, Helm
Responsibilities
Design, develop, and operate backend systems for multi-domain search collections; Design and standardize search architecture and indexing structures; Analyze and improve search accuracy, latency, and failure cases using operational logs and quality metrics; Develop and tune ranking models, rerankers, and recommendation logic; Build stable production backend infrastructure including API contracts, caching, and config registries; Lead technical design reviews and drive complex problem-solving initiatives
Seniority
Senior, hands-on IC with technical leadership