Hiring: Staff/Senior Software Engineer, Hybrid IR and Systems Company: Helios Location: New York, NY Job Posted Time: 2026-09-11 13:11:58 Employment Type: Full-time / Hybrid Target Skills & Keywords : Datadog, Security Clearance About the job Required Skills: •Own Proxi’s retrieval stack end to end, from corpus onboarding and index design through hybrid retrieval, fusion, reranking, reindexing, and backfills. •Advance our query-understanding and temporal-retrieval capabilities, including intent detection, entity resolution, structured filtering, and jurisdiction-, date-, and version-aware search. •Improve retrieval performance, reliability, and cost through capacity planning, caching, reranker optimization, and safe degradation under load. •Expand federated search across Proxi’s separate data collections, including source-aware query planning, filtering, score calibration, and result merging. •Enhance time as a first-class retrieval concept so users can search the correct version, status, or historical state of a record. •Improve the dynamic connection system to map documents and records to the people, organizations, agencies, events, and relationships they concern. •Expand support for multimodal content searchable through the same retrieval interface as Proxi’s continuously ingested datasets. •Own relevance quality and production performance, including evaluation, indexing, observability, authorization, provenance, and recovery. Qualifications: •Domain adaptation of embedding models through fine tuning, hard negative mining or distillation. •Work on policy, legislative, procurement, legal or healthcare corpora, where traceable information systems are mandatory. •Operating search in classified, air gapped or forward deployed environments. •Open source contributions to search and ranking projects. •This is a full-time, in-person role based in our SoHo office in New York City. Team members are expected to work from the office five days per week when they are not deployed with customers. •Certain customer engagements may require background checks, security reviews, access approvals, or eligibility for a U.S. government security clearance. Some projects may be subject to U.S. citizenship or other customer-specific access requirements. •We're not looking for passengers; we want driven innovators with a hunger to build from the ground up - obsessed with pushing the boundaries of natural language understanding, document processing, and personalized relevance. •Own outcomes, not just assigned tasks. Identify what needs to happen and drive it through completion. •Move quickly without lowering the standard. Speed and rigor are complementary. •Stay close to the mission and the user. The best decisions begin with the real problem. Compensation: •$185,000 - $285,000 / year Interested candidates, please apply directly through the job posting on company's career page or try via AI auto apply on this platform. Don't miss this opportunity to join a forward-thinking team!