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Senior Backend Engineer (Search, Ranking Service)

Pangyo (Software Dream Center), South Korea💼 Full-time🗓 2026-06-11 → 2026-07-30

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

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