Sign up to access all features of our service.
  • Job search
  • Favorites
  • Create a CV
    New
  • Salaries
  • Subscriptions

Principal Applied Scientist

$224k - $336k

Relativity

Posting Type

Remote/Hybrid

Job Overview

WHO WE ARE
Relativity is a leading legal data intelligence company building technology that helps users organize data, discover the truth, and act on it with confidence. Our AI-powered, cloud platform, RelativityOne, transforms massive volumes of complex information into actionable insights for litigation, investigations, regulatory inquiries, data breach responses, and other highstakes legal work where accuracy, trust, and defensibility are essential.

Relativity aiR is redefining document review through agentic AI systems that reason, cite their decisions, and scale across millions of documents. These systems automate complex legal workflows while keeping humans in the loop, enabling legal professionals to focus on what matters most.

WHAT WE DO
At Relativity, we are building a worldclass Applied Science organization focused on pushing the boundaries of intelligent systems in one of the most demanding and consequential domains: the legal system.

Applied Science Team
The Applied Science team sits at the core of Relativity's AI development. We are responsible for designing, validating, and operating the intelligent systems behind Relativity aiR. Our work goes far beyond simple model integrations. We build agentic systems that reason over documents, validate decisions statistically, remain auditable and defensible, and operate reliably at massive scale. Trust, reliability, and responsibility are foundational to everything we build.
Our team values curiosity, experimentation, rigor, and collaboration. We move quickly, validate assumptions with evidence, and simplify aggressively to deliver systems that are safe, reliable, and impactful in production.

Job Description and Requirements

ABOUT THE ROLE

As a Principal Applied Scientist, Reliability, you will lead the design and validation of intelligent systems that customers can trust in highstakes legal workflows. You will operate endtoend: understanding the problem space, designing solutions, validating them statistically, and bringing them to production in partnership with engineering, product, and customerfacing teams.

This role is ideal for an experienced applied scientist who thrives at the intersection of modeling, experimentation, and realworld system reliability, and who is motivated by building AI systems that are not only powerful, but also defensible, interpretable, and safe by design.

WHAT YOU'LL DO

  • Write productionquality code that solves real customer problems and scales cleanly, with systems designed to be easy to ship, operate, and maintain
  • Collaborate closely with fellow Applied Scientists as well as Engineers, Product Managers, Designers, and Customers
  • Design and execute statistically sound experiments and automate them into reusable benchmarks and evaluation frameworks
  • Rapidly prototype AI and MLpowered solutions and mature them into reliable, scalable production models
  • Select the appropriate modeling approach for each problem, ranging from classical machine learning techniques to frontier large language models
  • Validate model behavior rigorously using evidence, metrics, and experimentation, remaining open to changing course when the data demands it
  • Contribute to building intelligent systems that reason, cite their decisions, and operate defensibly at scale
  • Help push the boundaries of agentic AI while ensuring systems remain auditable, reliable, and responsible

WHAT WE'RE LOOKING FOR

  • 8+ years of professional experience in applied science, machine learning, or a closely related field
  • Master's or Ph.D. in Computer Science, Statistics, Applied Mathematics, or a related quantitative discipline, or equivalent professional experience
  • Proven ability to move quickly from prototype to production, simplifying complex ideas into robust systems
  • Experience reading, validating, and applying research with a healthy level of skepticism
  • Experience across a wide range of modeling techniques, from classical machine learning to largescale generative models
  • Familiarity with modern MLOps tooling and practices, including containers, workflow orchestration, deployment patterns, telemetry, and experimentation systems
  • Strong Python programming skills and experience with common data and ML libraries such as numpy, PyTorch, scikitlearn, and PySpark
  • Strong communication skills, with the ability to explain complex technical concepts clearly to both technical and nontechnical audiences
  • Endtoend ownership mindset, with the ability to understand new problem spaces, design solutions, and bring them to market alongside engineering, product, and support partners
  • A collaborative, curious, and adaptable approach, with comfort leading, questioning assumptions, and learning from failure

WHY WE COULD BE A GREAT FIT

HighImpact Problems

  • Work on intelligent systems that operate in one of the most highstakes domains, where trust, reliability, and defensibility truly matter.

Agentic AI at Scale

  • Build and extend AI systems that reason across millions of documents, cite their decisions, and automate complex legal workflows.

Scientific Rigor and RealWorld Impact

  • Apply deep experimentation and statistical validation to systems that ship to real customers and influence real outcomes.

Leadership and Growth

  • Lead technically while continuously learning in a thoughtful, supportive, and intellectually rich Applied Science organization.

Collaborative Culture

  • Join a team that values kindness, curiosity, technical excellence, and shared ownership of outcomes.

Compensation and Benefits

  • Competitive compensation, health and retirement programs, discretionary time off (DTO), parental leave for primary and secondary caregivers, companywide breaks, wellness resources, and an equity program.

Relativity is committed to competitive, fair, and equitable compensation practices.

This position is eligible for total compensation which includes a competitive base salary, an annual performance bonus, and long-term incentives.

The expected salary range for this role is between following values:

$224,000 and $336,000

The final offered salary will be based on several factors, including but not limited to the candidate's depth of experience, skill set, qualifications, and internal pay equity. Hiring at the top end of the range would not be typical, to allow for future meaningful salary growth in this position.

Required Skills:

Algorithms, Data Analysis, Machine Learning (ML), Natural Language, Python (Programming Language), Reinforcement Learning, Researching, Scientific Writing, Statistical Models, Technical Leadership
Vacancy posted 2 days ago
Similar jobs that could be interesting for youBased on the Principal Applied Scientist in Philadelphia, PA vacancy
  • $193.6k - $340.6k

     ...impact on the company and take ownership of their work. Join the team and create the future of customer experience together. Principal Applied AI Engineer, Finance We are seeking a Principal Applied AI Engineer to lead the design and delivery of next-generation AI and... 
    Principal
    Work from home
    Worldwide
    Flexible hours

    Genesys Cloud Services, Inc.

    Philadelphia, PA
    1 day ago
  •  ...Taxpayer Services - Return Integrity and Compliance Services- Project Analytics & Modeling Consider each location carefully when applying. If you are selected for a location, that location will become your official post of duty. Review the additional information... 
    Suggested

    US Government Jobs

    Philadelphia, PA
    1 day ago
  • $128k - $185k

     ...analytical models. Demonstrated experience with actuarial reserving models or insurance forecasting methodologies. Experience applying machine learning techniques such as regression models, gradient boosting, classification models, or anomaly detection. Ability... 
    Suggested
    Remote work
    Work visa

    Cover Whale Insurance Solutions

    Philadelphia, PA
    3 days ago
  • $80k - $120k

     ...records, including formerly incarcerated individuals, a fair chance at employment. Those with military experience are encouraged to apply. Equivalent expertise demonstrated through a combination of work experience, training, military experience, or education is welcome.... 
    Suggested
    Work experience placement
    Work at office
    Local area
    Remote work

    Indeed

    Philadelphia, PA
    6 days ago
  •  ...and help ensure the highest quality of clinical trial data through expert oversight and training of site raters. Why You Should Apply Flexible part-time consulting opportunity in a fully remote environment Contribute directly to research advancing treatments for... 
    Principal
    Part time
    Remote work
    Flexible hours

    Scientific Search

    Philadelphia, PA
    22 days ago
  •  ...The Associate Scientist will execute in-process analytical testing, assay development, and GMP testing when needed for gene therapy products...  ...organization, equipment upkeep, and inventory management. Apply analytical techniques to evaluate and characterize viral vector... 

    Germer International - Pharmaceutical Recruiting

    Plymouth Meeting, PA
    1 day ago
  •  ...outlets and demonstrated engagement with critical, interdisciplinary, and justice-oriented perspectives. Evidence of theoretical, applied, or critical contributions to philanthropy, nonprofit studies, social policy, social work, economics, or related fields. A... 
    Local area

    University of Pennsylvania

    Philadelphia, PA
    1 day ago
  • $156k - $234k

     ...If you are a current Jazz employee please apply via the Internal Career site. Jazz Pharmaceuticals is a global biopharma company...  ...patients worldwide. Please visit for more information. The Sr. Principal Statistician, Biostatistics will be a lead statistician... 
    Principal
    Work at office
    Remote work
    Worldwide
    Flexible hours

    Jazz Pharmaceuticals

    Philadelphia, PA
    28 days ago
  •  ...(2026-2027) school year: POSITION TITLE: Elementary School Principal (K-5) REPORTS TO: Superintendent and Assistant Superintendent...  ...public groups and board of directors. # Ability to apply advanced mathematical concepts and apply mathematical operations... 
    Principal
    Work at office

    Cheltenham School District

    Elkins Park, PA
    3 days ago
  •  ...innovative research programs in cardiovascular science as the principal focus of their career. Applicants must have an M.D. or M.D./Ph....  ...individuals with disabilities/protected veterans are encouraged to apply. The successful candidate should have demonstrated excellent... 
    Local area

    University of Pennsylvania

    Philadelphia, PA
    4 days ago
  •  ...The Senior Scientist will play a key role in the development, optimization, transfer, qualification, monitoring, and execution of molecular analytical methods supporting gene therapy process development and/or Manufacturing. This individual will provide technical expertise... 

    Germer International - Pharmaceutical Recruiting

    Plymouth Meeting, PA
    1 day ago
  • $43 per hour

     ...analytically, validates results using established indicators, investigates deviations from the norm, recognizes trends or shifts, and applies corrective action. * Performs, reviews and documents all quality control according to established policies and procedures. *... 
    Hourly pay
    Daily paid
    Full time
    Temporary work
    Part time
    Local area
    Remote work
    All shifts
    Flexible hours
    Shift work
    Night shift
    Weekend work

    Virtua, Inc.

    Camden, NJ
    2 days ago
  •  ...recognize the cultural beliefs, values, traditions, language preferences, and health practices of the communities that we serve and to apply that knowledge to produce positive health outcomes. We also recognize that each of us has a different way of thinking and perceiving... 
    Full time
    Part time
    Local area
    Shift work
    Weekend work
    Day shift

    Trinity Health

    Philadelphia, PA
    4 days ago
  •  ...recognize the cultural beliefs, values, traditions, language preferences, and health practices of the communities that we serve and to apply that knowledge to produce positive health outcomes. We also recognize that each of us has a different way of thinking and perceiving... 
    Daily paid
    Part time
    Local area
    Shift work
    Weekend work
    Afternoon shift

    Trinity Health

    Darby, PA
    2 days ago
  •  ...recognize the cultural beliefs, values, traditions, language preferences, and health practices of the communities that we serve and to apply that knowledge to produce positive health outcomes. We also recognize that each of us has a different way of thinking and perceiving... 
    Temporary work
    Part time
    Relief
    Local area
    Immediate start
    Flexible hours
    Shift work
    Night shift
    Rotating shift
    Afternoon shift

    Trinity Health

    Darby, PA
    4 days ago
  •  ...and lucrative signing incentives. If you're looking to take the next step in your career as a laboratory tech, we encourage you to apply! Shift Details: Evening / Nights Job Summary for the Medical Lab Technologist / Technician: Perform various laboratory tests... 
    Relocation package
    Shift work
    Night shift
    Afternoon shift

    MLee Healthcare Staffing and Recruiting, Inc

    Magnolia, NJ
    1 day ago
  •  ...United States of America Nationally ranked, Jefferson, which is principally located in the greater Philadelphia region, Lehigh Valley and...  ...new knowledge through basic/programmatic, clinical and applied research. Thomas Jefferson University, home of Sidney Kimmel Medical... 
    Daily paid
    Full time
    Temporary work
    Part time
    Flexible hours
    Shift work
    Weekend work

    Thomas Jefferson University Hospital

    Philadelphia, PA
    3 days ago
  • $2,660 per week

     ...to quality laboratory services. Ideal for certified Medical Technologists (MT/MLS) seeking short-term hospital laboratory roles. Apply now to be considered for this Meadowbrook, PA Core Lab travel contract. Join our healthcare team today and advance your clinical laboratory... 
    Weekly pay
    Contract work
    Temporary work
    Local area
    Immediate start
    Shift work
    Afternoon shift

    GHR Healthcare

    Abington, PA
    4 days ago
  •  ...including criminal background check. You must be a U.S. Citizen to apply for this job Designated and/or random drug testing may be...  ...will work in the Pathology and Laboratory Medicine Service. Principal responsibilities involve performing testing on blood and body... 
    Full time
    Local area
    Immediate start
    Monday to Friday
    Shift work
    Weekend work
    Day shift
    Afternoon shift

    EGA Associates, LLC.

    Philadelphia, PA
    2 days ago
  •  ...recognize the cultural beliefs, values, traditions, language preferences, and health practices of the communities that we serve and to apply that knowledge to produce positive health outcomes. We also recognize that each of us has a different way of thinking and perceiving... 
    Part time
    Local area
    Shift work
    Day shift

    Trinity Health

    Darby, PA
    2 days ago
  •  ...United States of America Nationally ranked, Jefferson, which is principally located in the greater Philadelphia region, Lehigh Valley and...  ...new knowledge through basic/programmatic, clinical and applied research. Thomas Jefferson University, home of Sidney Kimmel Medical... 
    Shift work

    Thomas Jefferson University Hospital

    Philadelphia, PA
    14 hours ago
  • $180k - $240k

     ...healthcare that offer growth, development, and the chance to positively impact lives every day. Why Vivian Health? Be sure to apply via Vivian Health to increase your chances of landing your perfect job. Just complete your Vivian Health profileonce, and get access... 
    Full time
    Local area
    Shift work

    SpecialtyCare

    Abington, PA
    2 days ago
  • $31 per hour

     ...MICROBIOLOGY IMMUNOLOGY Camden, NJ Job ID 64180 Job Type Part Time Shift Day Specialty Laboratory Apply Transcript Hi everybody. My name is, bob huckle. I'm the senior vice president for hospital operations. I'm very fortunate in my... 
    Hourly pay
    Full time
    Part time
    Shift work

    Cooper University Health Care

    Camden, NJ
    2 days ago
  •  ...non-tenure academic clinician track. Applicants must have an M.D. or equivalent degree. Candidates in mid-career are encouraged to apply. Teaching responsibilities may include teaching residents, students, and fellows at Scheie and the Philadelphia VA. Clinical responsibilities... 
    Local area

    University of Pennsylvania

    Philadelphia, PA
    3 days ago
  •  ...or scholarship is required in the Clinician Educator track. Applicants with National and International reputations are encouraged to apply. Applicants will have demonstrated excellent qualifications in education, research, and clinical care. Specifically, candidates... 
    Local area

    University of Pennsylvania

    Philadelphia, PA
    1 day ago
  •  ..., and more. About the role Eli is looking for an R&D Scientist. You will be a key member of our R&D team, helping to discover...  ...access to the Bota Bota spa in Montreal to recharge. How to apply Sounds like you? Please apply using this link: Please... 
    Work at office

    Eli Health

    Philadelphia, PA
    a month ago
  • $153.36k

     ...American Water on LinkedIn, Facebook, X and Instagram. Primary Role Principal Solution Engineer HTR (multiple openings) American Water Works...  ...of pay: $153,358.00 per year. Interested applicants should apply at amwater.com/corp/careers using Req ID 109786. Competencies... 
    Principal
    Local area
    Remote work

    American Water

    Camden, NJ
    14 hours ago
  •  ...01k, etc) Requirements - ASCP certification required (No MLT's) - Prior laboratory experience and knowledge, including blood bank Click apply or email your resume to ****@*****.***| call or text (***) ***-****! You can also schedule a time to chat here -
    Permanent employment
    Full time
    Bank staff
    Shift work

    National Coalition of Healthcare Recruiters

    Philadelphia, PA
    1 day ago
  •  ...recognize the cultural beliefs, values, traditions, language preferences, and health practices of the communities that we serve and to apply that knowledge to produce positive health outcomes. We also recognize that each of us has a different way of thinking and perceiving... 
    Full time
    Local area
    Shift work
    Night shift
    Weekend work
    Day shift

    Trinity Health

    Philadelphia, PA
    6 days ago
  •  ...recognize the cultural beliefs, values, traditions, language preferences, and health practices of the communities that we serve and to apply that knowledge to produce positive health outcomes. We also recognize that each of us has a different way of thinking and perceiving... 
    Full time
    Temporary work
    Local area
    Immediate start
    Shift work
    Afternoon shift

    Trinity Health

    Darby, PA
    1 day ago

Do you want to receive more vacancies?

Subscribe and receive similar vacancies to Principal Applied Scientist. Be the first to apply!