Senior Search Engineer - OpenSearch

Accountabilities:: Design index mappings, analyzers, and sharding strategies suited to large, high-cardinality enterprise catalogs. Build and maintain indexing pipelines that synchronize search data with SAP source systems, including full reindexing and incremental update processes. Design and optimize queries using query DSL, scoring and boosting, synonyms, stemming, fuzzy and typo tolerance, faceting, and aggregations. Develop and apply relevance measurement approaches to demonstrate whether search improvements produce measurable gains. Support customer delivery engagements by profiling catalogs, tuning index and query configurations, and addressing customer-specific relevance requirements. Diagnose and resolve search performance issues involving expensive queries, mapping and analyzer design, sharding decisions, and data modeling. Implement vector and hybrid search alongside lexical search when semantic matching can measurably improve results. Define platform requirements such as cluster sizing, configuration, index lifecycle policies, snapshot strategies, and upgrade requirements. Build clean, reliable, and well-documented search APIs for a TypeScript-based product stack. Define search health, quality, and performance signals that the platform should monitor and surface. Collaborate with product management on search roadmap priorities and with solution engineering on multi-tenant architecture considerations. Document search architecture and relevance decisions so engineering teams can understand and maintain the underlying design. Review search-related work from teammates and contribute to higher standards for query design, relevance engineering, and technical rigor. Requirements: Deep hands-on expertise with OpenSearch or Elasticsearch, ideally including production search systems that you have personally designed and built. Strong command of query DSL, mappings, analyzers, aggregations, and the various mechanisms that influence search relevance. Proven experience in relevance engineering, including the ability to demonstrate and measure improvements in search quality. Strong understanding of how index and cluster architecture affects performance, including sharding, mapping design, query cost, and Lucene fundamentals. Excellent debugging skills for slow or expensive queries, mapping and analyzer issues, and search results that fail to meet user expectations. Experience building high-throughput ingestion and indexing pipelines connected to systems of record. Proficiency in TypeScript, JavaScript, and/or Python for developing services, pipelines, and search tooling. Comfortable working directly with customers and delivery teams to understand requirements and solve search problems. Experience collaborating with separate platform or IT teams by clearly specifying requirements, handing over solutions, and participating in technical diagnosis. Strong written and verbal communication skills, with a habit of documenting technical decisions and relevance trade-offs. Bachelor's degree in Computer Science or a related technical field, or equivalent practical experience. Experience with vector and semantic search, including embeddings, OpenSearch k-NN, hybrid ranking, or learning-to-rank, is preferred. Familiarity with OpenSearch Dashboards, Data Prepper, Logstash, or Kafka-based ingestion is a plus. Experience working with SAP or ERP material master and catalog data, including part numbers, cross-references, and unit-of-measure complexity, is advantageous. Knowledge of query understanding techniques such as entity extraction, intent classification, spell correction, and autocomplete is a plus. Experience designing multi-tenant search architectures and tenant data isolation is preferred. Customer-facing implementation, delivery, or professional services experience is advantageous. Working knowledge of containers and Kubernetes is a plus. Contributions to OpenSearch, Lucene, or other open-source search projects are valued. Benefits: Fully remote working environment. Full-time contractor position. Opportunity to design and build search capabilities used across large-scale enterprise datasets. Combination of product engineering and customer-facing delivery work. Hands-on exposure to OpenSearch, relevance engineering, indexing pipelines, and hybrid search. Opportunity to solve complex challenges involving scalability, performance, data quality, and multi-tenant architecture. Collaboration with product, engineering, implementation, solution engineering, IT, and customer teams. Opportunity to contribute to technical standards and search architecture decisions.