Senior Entity Resolution Engineer

ABOUT DEFCON AI

• RESILIENCE IN THE FACE OF DISRUPTION. DEFCON AI is an insights company that leverages artificial intelligence, mathematical optimization, data analytics, and software engineering for resilient optimization of complex systems.
• In today’s dynamically changing world, DEFCON AI’s technology aligns outcomes with operational goals, better decision making, and empowers customers to anticipate assess, and mitigate the impacts of disruptions.

About the Role

This role sits in one of the most critical parts of the platform: determining when records from dozens of disparate sources represent the same real-world entity. Graph design and matching strategy are developed in-house, and you’ll be the engineer who turns those concepts into production-ready capability. You’ll shape implementation details, but this is first and foremost a builder role.

You’ll join a team building technology that supports real-world government mission needs. The platform ingests and analyzes data from a wide range of sources, applies AI-assisted workflows to surface what matters most, and provides transparent, explainable recommendations that analysts can trust. Every match, merge, and relationship you create helps turn fragmented information into insight.

You’ll own the matching build lifecycle end to end: blocking strategies, candidate generation, pairwise scoring, clustering, threshold policy, and the deduplication and known-entity checks that reuse the same engine. You’ll also build the provenance framework that lets every node, edge, and assertion in the graph be traced to the source that asserted it, so matching decisions are auditable and explainable.

This is a fully remote role with occasional travel to DEFCON AI headquarters, customer sites, and partner facilities as needed.

Key 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: the fixed reference dataset, candidate retrieval and final matching evaluated separately, and threshold recommendations with evidence for review

Document matching logic in enough detail to serve as an implementation reference for other engineers

Required Qualifications

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

Preferred Qualifications

Direct experience applying probabilistic matching to inconsistent identity data such as names, dates, addresses, and identifiers, and familiarity with the failure modes of each

Familiarity with probabilistic record-linkage frameworks and tooling such as Fellegi-Sunter models, Splink, Dedupe, Zingg, or an in-house equivalent

Record linkage, master data management, or identity management experience

Graph data modeling and graph algorithms applied in production

PostgreSQL and pgvector or comparable

Active Top Secret clearance

What Success Looks Like

Matching decisions that can be explained and defended to a non-technical reviewer

A data model and matching pipeline the rest of the team can build on without redesigning it

Provenance intact end-to-end, so every match traces to its source

What We Offer

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

Salary Range: $160,000—$195,000. This represents the typical salary range for this position based on experience, skills, and other factors.

We’re an Equal Opportunity Employer: You’ll receive consideration for employment without regard to race, sex, color, religion, sexual orientation, gender identity, national origin, protected veteran status, or on the basis of disability.

Applicant Data Disclosure

By submitting an application, you acknowledge that Defcon AI uses third-party service providers to facilitate its recruitment and hiring processes. These providers include applicant tracking systems, candidate verification platforms, and fraud detection tools (collectively, "Hiring Platforms"). Your application materials, including your résumé, cover letter, work samples, responses to application questions, and any other information you submit, may be transmitted to and processed by these Hiring Platforms for the following purposes:

Managing and administering your application throughout the hiring process;

Verifying the accuracy and authenticity of application materials, including by cross-referencing information you provide against publicly available sources and proprietary databases;

Identifying indicators of potentially fraudulent, fabricated, or materially misleading application content, including but not limited to discrepancies between submitted materials and publicly available professional profiles, geographic anomalies, and fabricated work histories.

Applications that are flagged through this process as containing indicators of fraud or material misrepresentation may be declined from further consideration. If you have questions about the status of your application or the evaluation process, please contact [email protected] .

Defcon AI requires its Hiring Platform providers to process your information solely for the purposes described above and in accordance with applicable law. Your information will be retained only for as long as necessary to fulfill these purposes and any applicable legal obligations, after which it will be deleted in accordance with Defcon AI's data retention policies.

For more information about how your data is used, please refer to our Privacy Policy and Applicant Privacy Notice .