Senior Entity Resolution Engineer
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Job Description
Senior Entity Resolution Engineer building production entity-resolution and graph provenance systems. Supporting DEFCON AI’s AI-driven platform for resilient optimization of complex government missions.
Responsibilities:
- Implement and refine entity-level record matching: blocking, candidate generation, pairwise scoring, clustering, and threshold policy
- Reuse one matching engine for record linkage, deduplication, and known-entity checks
- Establish provenance so every node and edge traces back to the source that asserted it
- Own the false-merge versus false-split tradeoff in matching decisions and make it explainable
- Own technical execution of the matching approach against the in-house design, including separate evaluation of the fixed reference dataset, candidate retrieval, and final matching, plus threshold recommendations with evidence for review
- Document matching logic in enough detail to serve as an implementation reference for other engineers
Requirements:
- 5+ years of experience, including shipping production record matching or entity resolution
- Ability to explain the matching tradeoffs you made, including how you handled false merges versus false splits
- Strong Python and SQL, with demonstrated experience on large, messy, real-world data
- Ability to explain a matching decision to a stakeholder who must defend it without understanding its internals
- US Citizenship Required
- Active US Secret clearance required to start
- Direct experience applying probabilistic matching to inconsistent identity data such as names, dates, addresses, and identifiers, and familiarity with the failure modes of each (preferred)
- Familiarity with probabilistic record-linkage frameworks and tooling such as Fellegi-Sunter models, Splink, Dedupe, Zingg, or an in-house equivalent (preferred)
- Record linkage, master data management, or identity management experience (preferred)
- Graph data modeling and graph algorithms applied in production (preferred)
- PostgreSQL and pgvector or comparable (preferred)
- Active Top Secret clearance (preferred)
Benefits:
- A fully remote, results-based environment
- Competitive salary, bonus, and equity package
- 100% employer paid, comprehensive health insurance including medical, dental, and vision for you and your family
- Unlimited PTO, with your manager’s approval
- Flexible work environment where you manage your work day
- 14 weeks of fully-paid parental leave
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