Full-Time

Principal Scientist

Analytical Chemistry

Updated on 9/3/2026

RA Capital Management

RA Capital Management

Invests in healthcare, life sciences.

Compensation Overview

$160k - $190k/yr

+ Annual bonus + Long-term incentives

Boston, MA, USA

In Person

On-site at the company headquarters in Cambridge, Massachusetts.

Bachelor's, Master's, PhD

Category
Biology & Biotech (1)

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Requirements
  • A PhD in chemistry or a related discipline with 6+ years of experience working with oligonucleotide therapeutics such as siRNA and ASOs in the biopharmaceutical industry, or a BS/MS with 10+ years of experience.
  • Direct experience working on oligonucleotide platforms with a significant background in chemistry or a related discipline.
  • Experience analyzing peptide-, protein-, or antibody-oligonucleotide conjugates.
  • Proficiency with analytical methods including size-exclusion chromatography, ion-exchange chromatography, reverse-phase high-performance liquid chromatography, and mass spectrometry.
  • Experience with bioanalytical assays to determine pharmacokinetic, distribution, and pharmacodynamic profiles of oligonucleotide therapeutics is a plus.
  • Ability to operate independently in a laboratory setting.
  • Ability to contribute to the development of novel delivery systems while maintaining process and detail orientation for release of high-quality oligonucleotide material for in vivo testing.
Responsibilities
  • Define and implement reproducible analytical protocols to characterize oligonucleotides for biological evaluation in the targeted delivery platform.
  • Develop and implement quality-control methods to determine the purity, composition, and concentration of oligonucleotides and conjugates using high-performance liquid chromatography, mass spectrometry, and bioanalytical assays.
  • Develop and implement analytical methods, including mass spectrometry, to determine drug-to-conjugate ratios of antibody-oligonucleotide conjugates.
  • Develop and implement analytical methods to determine the in vitro stability, including serum stability, of oligonucleotides and conjugates.
  • Assist the biology group in developing and implementing analytical methods to determine the pharmacokinetics and distribution of oligonucleotides and conjugates in vivo.
  • Assist with building the internal laboratory, procuring and using analytical equipment to characterize oligonucleotides and antibody- or peptide-oligonucleotide conjugates.
  • Assist conjugation scientists in developing purification methods for oligonucleotide conjugates, including size-exclusion chromatography and ion-exchange chromatography.
  • Interpret complex scientific data and characterize high-quality conjugate materials efficiently and effectively.
  • Interface with the delivery group and cross-functional teams to advance oligonucleotide therapeutic programs.
Desired Qualifications
  • Experience analyzing peptide-, protein-, or antibody-oligonucleotide conjugates in a cross-functional environment.
  • Experience with bioanalytical assays to determine pharmacokinetic, distribution, and pharmacodynamic profiles of oligonucleotide therapeutics.
RA Capital Management

RA Capital Management

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RA Capital Management channels capital and expertise into healthcare, life sciences, and planetary health companies across growth stages. It funds ventures from private seed rounds to public follow-ons and uses evidence-based investing to guide decisions. Its TechAtlas research engine and Raven incubator provide internal data and a collaborative platform for entrepreneurs to develop and commercialize ideas. The firm aims to grow value for its portfolio and stakeholders by supporting companies that advance health outcomes, managing over $10 billion in assets.

Company Size

N/A

Company Stage

N/A

Total Funding

$39.9B

Headquarters

Boston, Massachusetts

Founded

2001

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Simplify Jobs

Simplify's Take

What believers are saying

  • Equillium raised $35 million with RA Capital on March 13, 2026, extending pipeline optionality.
  • RA Capital opened 24 new positions in Q1 2026, showing aggressive deployment.
  • Its portfolio concentration in Ascendis, Septerna, and Vaxcyte creates outsized upside if winners compound.

What critics are saying

  • Biohaven and Yale won a $4 million judgment against RA Capital on August 25, 2026.
  • RA Capital sold $63.45 million of Septerna stock on August 12, 2026, signaling concentrated exit pressure.
  • Its Avilar trade-secret case exposes firm culture, and another verdict could damage dealflow with universities.

What makes RA Capital Management unique

  • RA Capital is evidence-based, multi-stage, and company-building, spanning healthcare and planetary health.
  • It backed 84 public positions and 103 private investments by mid-2026.
  • It still leads oversized financings, including Werewolf Therapeutics' $150 million round in August 2026.

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Benefits

Remote Work Options

Flexible Work Hours

Professional Development Budget

Company News

PR Newswire
Sep 3rd, 2026
Superluminal Medicines raises $60M Series B to advance rare obesity drug into Phase 1 trial

Superluminal Medicines has closed an oversubscribed $60 million Series B financing led by BVF Partners, with participation from Deep Track Capital and Perceptive Advisors alongside existing investors including RA Capital Management, Insight Partners, and NVIDIA. The Boston-based biotechnology company will use the proceeds to advance its lead programme — a selective MC4R agonist for rare genetic forms of obesity and hypothalamic obesity — into a Phase 1 clinical trial by the end of 2026. The funding will also support expansion of its GPCR-focused discovery platform. Superluminal integrates AI, machine learning, and structural biology to develop small-molecule therapies targeting G protein-coupled receptors for endocrine and cardiometabolic diseases. The company maintains a strategic collaboration with Eli Lilly for advancing GPCR-targeted therapeutics.

Morningstar
Aug 31st, 2026
Reframe Systems raises $40M to scale robotic microfactory network delivering homes 3x faster

Reframe Systems, a physical AI company industrialising homebuilding, has raised $40 million in venture-backed equity financing. The round was led by Energy Impact Partners, with participation from Counterpart Ventures, E12 Ventures, Global Brain, Thin Line Capital, Up Partners, LACI Impact Fund, and existing investors including Eclipse and VoLo Earth. The company builds small, highly automated microfactories near communities requiring housing. Its technology delivers homes three times faster and at 35% lower cost than traditional construction. Reframe has completed 10 homes and expects to deliver 114 additional units over the next year. The funding will support expansion of Reframe's microfactory network across North America. The company's new Massachusetts facility, FAB1, is designed to produce up to 500 multifamily units or 250 single-family homes annually with less than $5 million in equipment.

IT桔子
Aug 28th, 2026
Haobao Biopharmaceuticals raises $120M Series C for hepatitis B cure research

Haobao Biopharma, a Chinese biopharmaceutical company focused on developing hepatitis B treatments and oligonucleotide technologies, has secured $120 million in Series C funding. The round was led by a global strategic investor, with participation from new investor RA Capital Management and existing backers including Qiming Venture Partners, 6 Dimensions Capital, and Sherpa Healthcare Partners. The financing will support Phase III registration trials and commercialisation preparations for AHB-137, accelerate development of AHB-171 and next-generation combination therapies, and expand the company's oligonucleotide product pipeline. Haobao utilises its proprietary Med-Oligo platform and targeted delivery technologies to develop treatments across infectious diseases, immuno-oncology, and muscular disorders.

PR Newswire
Aug 28th, 2026
AusperBio raises $120M Series C to advance hepatitis B therapy towards commercialisation

AusperBio Therapeutics has closed a $120 million Series C financing round to advance its lead hepatitis B therapy, AHB-137, towards commercialisation. The financing was led by an unnamed strategic investor, with participation from new investor RA Capital Management and existing backers including HanKang Capital and Qiming Venture Partners. The proceeds will support AHB-137's Phase 3 registrational programme and commercialisation readiness. Funds will also accelerate development of AHB-171, the company's investigational siRNA candidate, and advance combination therapies for chronic hepatitis B. With this round, AusperBio has raised $360 million since 2024. The San Francisco-based biotech is developing oligonucleotide therapeutics targeting chronic hepatitis B, which affects an estimated 254 million people worldwide. AHB-137 is currently being evaluated in a Phase 3 trial in China.

MarketScreener
Aug 21st, 2026
Werewolf Therapeutics secures $150M in oversubscribed private placement led by RA Capital and Janus Henderson

Werewolf Therapeutics has entered into a securities purchase agreement to raise $150 million through a private placement ahead of a planned merger. The oversubscribed financing, scheduled to close on 21 August 2026, is co-led by RA Capital Management and Janus Henderson Investors. Other participants include Aberdeen Investments, Adage Capital Partners, ADAR1 Capital Management, Affinity Asset Advisors, Arkin Bio Capital, Balyasny Asset Management, Patient Square Capital's Enavate Sciences, SilverArc Capital, Sphera Healthcare, and Woodline Partners, alongside other institutional buyers and existing investors. The company will sell common shares and pre-funded warrants with an exercise price of $0.001 per share. The purchase price per share will be determined before closing.