Mercor logo
Mercor

Cincinnatus is an enterprise staffing company that partners with leading technology companies to source and employ highly skilled professionals for full-time and long-term contingent roles. Cincinnatus serves as the employer of record for these engagements, providing W-2 employment, payroll, benefits, and compliance, while placing employees directly within client teams to work on high-impact initiatives. Roles hired through Cincinnatus are not project-based or freelance engagements. They are structured, role-based positions that typically involve full-time or fixed-term commitments, close collaboration with a client's internal teams, and integration into standard enterprise workflows. Cincinnatus is a legal entity separate from Mercor. While opportunities may be discovered through Mercor's platform, employment, onboarding, payroll, and benefits for these roles are administered by Cincinnatus. Equal Employment Opportunity Cincinnatus is proud to be an Equal Employment Opportunity employer. We do not discriminate based upon race, religion, color, national origin, sex (including pregnancy, childbirth, reproductive health decisions, or related medical conditions), sexual orientation, gender identity, gender expression, age, status as a protected veteran, status as an individual with a disability, genetic information, political views or activity, or any other legally protected characteristic. Cincinnatus is committed to providing reasonable accommodations for qualified individuals with disabilities and disabled veterans throughout the job application process.

Research Scientist – Physicist

Research ScientistResearch ScientistFull TimeRemoteMid Level

Location

United States + 43 moreAll locations: United States, United Kingdom, Germany, France, Estonia, Portugal, Hungary, Poland, Ukraine, Romania, Bulgaria, Czech Republic, Slovakia, Belarus, Moldova, Republic Of, Sweden, Greece, Belgium, Italy, Ireland, Switzerland, Netherlands, Finland, Malta, Denmark, Lithuania, Croatia, Spain, Austria, Bosnia And Herzegovina, Iceland, Luxembourg, Macedonia, The Former Yugoslav Republic Of, Montenegro, Norway, Serbia, Slovenia, Albania, Cyprus, Latvia, Monaco, Canada

Posted

2 days ago

Salary

$73 / hour

Seniority

Mid Level

LLMsRLHFdata annotationmodel evaluationevaluation rubricsstructured review frameworks

Job Description

Role Description

  • Write and refine prompts to guide model behavior in physics contexts.
  • Evaluate LLM-generated responses to physics-related queries for conceptual accuracy and reasoning quality.
  • Conduct fact-checking using authoritative public sources and domain knowledge.
  • Annotate model responses by identifying strengths and areas of improvement.
  • Assess clarity, structure, and appropriateness of explanations for different audiences.
  • Apply consistent evaluation standards by following clear taxonomies and benchmarks.

Qualifications

  • Must-Have:
    • PhD in Physics or closely related field.
    • Deep expertise in Classical Mechanics & Dynamics, Electromagnetism, Thermodynamics, Quantum Physics, or Relativity.
    • Significant experience using large language models (LLMs).
    • Excellent writing skills and ability to explain complex physics concepts.
    • Strong attention to detail and experience reviewing technical writing.
  • Preferred:
    • Experience with RLHF, model evaluation, or data annotation work.
    • Experience teaching or explaining physics concepts to non-experts.
    • Familiarity with evaluation rubrics or structured review frameworks.

Company Description

Mercor connects elite creative and technical talent with leading AI research labs. Headquartered in San Francisco, our investors include Benchmark, General Catalyst, Peter Thiel, Adam D'Angelo, Larry Summers, and Jack Dorsey.

Job Requirements

  • Must-Have:
  • PhD in Physics or closely related field.
  • Deep expertise in Classical Mechanics & Dynamics, Electromagnetism, Thermodynamics, Quantum Physics, or Relativity.
  • Significant experience using large language models (LLMs).
  • Excellent writing skills and ability to explain complex physics concepts.
  • Strong attention to detail and experience reviewing technical writing.
  • Preferred:
  • Experience with RLHF, model evaluation, or data annotation work.
  • Experience teaching or explaining physics concepts to non-experts.
  • Familiarity with evaluation rubrics or structured review frameworks.

Related Categories

Related Job Pages

More Research Scientist Jobs

Full TimeRemoteTeam 501-1,000

The role involves assisting in the computational design of novel protein antigens for vaccine research, applying and evaluating emerging AI/ML approaches like LLMs for protein engineering. Responsibilities also include supporting experimental assessment, analyzing data, and contributing to internal reports.

United States
$21 - $26 / hour
IQVIA logo

Principal Biostatistician FSP, Phase 1 to 3 Safety

IQVIA

Accelerate innovation for a healthier world.

Research Scientist2 days ago
Full TimeRemoteTeam 10,001+H1B Sponsor

The Principal Biostatistician provides statistical support for pharmaceutical clinical trials, collaborating with multi-disciplinary teams to establish objectives and timelines. Responsibilities include authoring statistical sections of protocols and analysis plans, monitoring project activities, and contributing to regulatory documents like NDAs and DSURs.

United States
$96.4K - $294K / year
ŌURA logo

Behavioral Scientist

ŌURA

Better lives through better sleep.

Research Scientist2 days ago
Full TimeRemoteTeam 201-500H1B No Sponsor

The role involves developing new behavioral models and measurement approaches to power AI-driven health guidance, while also partnering closely with product squads to translate behavioral science into impactful, member-facing experiences.

PythonRSQLBehavioral ScienceDigital HealthQuantitative ResearchQualitative ResearchData Science
United States
$127K - $178K / year
Cogstate logo

Principal Scientist

Cogstate

Simplifying brain health measurement.

Research Scientist2 days ago
Full TimeRemoteTeam 51-200Since 1999H1B No Sponsor

Principal Scientist leading clinical trials at Cogstate

United States
$145K - $160K / year