Software Engineer

The Role: As a Senior Software Engineer on a search vertical, you'll help build systems that capture what is true about a domain. You'll work on extracting, connecting, retrieving, and reasoning over knowledge from the web and beyond, turning messy, real-world data into structured, trustworthy knowledge so AI agents can answer questions with precision and completeness. You will optimize the retrieval and knowledge layer for a vertical: how a domain's content is indexed, linked into entities, ranked, and continuously refreshed, then measured and improved against rigorous IR metrics. This is an information-retrieval and systems role spanning indexing internals, hybrid retrieval, and entity resolution, with the goal of making each vertical the best place in the world to search its domain. In this position, your responsibility will be to Design, implement, and operate the retrieval system for a search vertical; Connect and tune the data pipeline, from ingestion to relevance tuning; Build knowledge-graph and entity-resolution layers: entity linking / NER, ontologies, and graph databases (Neo4j or similar); Develop structured-extraction pipelines over messy, unstructured domain data; Reason about freshness and trust: model how confident we are in a fact and how stale it has become before we serve it; Define evaluation and quality metrics for relevance and drive measurable improvements; Collaborate with crawling, indexing, and ML teams to ensure retrieval and ranking requirements are met; Enable safe experimentation with retrieval, ranking, and extraction strategies. You may be a good fit if you: 6+ years of software engineering experience, some of it in search / information retrieval; Strong IR fundamentals: inverted indexes, BM25/TF-IDF, query understanding, ranking, and evaluation (nDCG/MRR/recall@k); Experience with vector & hybrid retrieval: ANN, dense+sparse fusion, embeddings models; Experience building structured extraction over messy/unstructured domain data; Fluent in Python and comfortable with systems-level performance work; Strong candidates may also have experience with: Knowledge graphs: entity resolution, entity linking / NER, graph DBs (Neo4j), ontologies / schema design; Owning relevance / ranking for a real product and improving it against IR metrics; Data quality, truth discovery, or systems that decide how much to trust a piece of information; Published work on IR, ranking, or knowledge graphs;