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

Scientist I/II, Protein Expression and Purification

$90k - $120k

San Diego Stealth Startup

Job Description

Job Description

Location: San Diego, CA

Job Type: Full-Time

Compensation: $90,000 to $120,000

Position Overview

We are seeking a Scientist I/II, Enzyme Assay & Characterization to play a key role in developing and executing biochemical assays that support the company's multi-omics platform development. This individual will optimize and implement assays.

The Scientist I/II will contribute directly to enzyme evaluation. This role offers opportunities for broad technical growth, including assay development, molecular biology, protein engineering and integration.

The candidate must be detail-oriented, analytical, and collaborative, thriving in a dynamic environment that values innovation, cross-disciplinary interaction, and scientific rigor.

Key Responsibilities

  • Clone, express, and screen protein constructs in bacterial expression systems.
  • Optimize bacterial expression conditions.
  • Execute purification workflows.
  • Characterize protein quality.
  • Optimize and implement biochemical assays.
  • Develop, optimize, and validate spectroscopic and fluorescence-based assays.
  • Troubleshoot and refine assays for reproducibility, sensitivity, and throughput.
  • Collaborate closely with protein expression/purification, enzymology, protein engineering, and molecular biology teams.
  • Document methods, maintain rigorous records, contribute to SOPs and prepare data summaries and reports.
  • Support lab organization, maintain equipment, and ensure compliance with safety and reproducibility practices.

Qualifications

  • B.S. in Biochemistry, Molecular Biology, Enzymology, or related field with 2–6 years of relevant experience, OR M.S. with 0–4 years of relevant experience. Level of position will depend on educational credential and years of experience.
  • Demonstrated experience optimizing and implementing biochemical assays.
  • Hands-on experience with spectroscopic and fluorescence-based assays.
  • Hands-on experience with gel electrophoresis and gel-based assays.
  • Strong experience with data visualization software.
  • Excellent organizational, problem-solving, and communication skills.
  • Ability to work independently and collaboratively in cross-functional teams.

Why Join Us

  • Influence the foundational technologies and strategies of a company poised to shape the future of clinical genomics and healthcare.
  • Work in a dynamic, collaborative environment where innovation and scientific rigor are deeply valued.
  • Join a seasoned and multidisciplinary team tackling high-impact problems at the intersection of science and engineering.
  • Competitive compensation and equity package, comprehensive benefits, and flexibility to support work-life integration.

We are an equal opportunity employer. We thrive on diversity and collaboration.

Vacancy posted 2 days ago
Similar jobs that could be interesting for youBased on the Scientist I/II, Protein Expression and Purification in San Diego, CA vacancy
  •  ...sciences industry by cultivating and empowering exceptional scientists to deliver specialized laboratory services that advance...  ...clients. We currently have a role available for a Protein Purification/Expression Biochemist to join our San Diego team.   Job duties... 
    Suggested
    Contract work
    Local area
    Relocation package
    Day shift

    Cogent Scientific

    San Diego, CA
    7 days ago
  •  ...AlivaMab Biologics seeks a Scientist to join the Protein Sciences team to design, optimize, and execute transient transfection...  ...for antibodies and proteins in mammalian expression systems. You will drive developability and purification strategies while applying high-throughput... 
    Suggested

    AlivaMab Biologics

    San Diego, CA
    1 day ago
  • We are seeking a Scientist to join our Lead Discovery team with a focus...  ...the Scientist I or Scientist II level based on the selected...  ...lines or using inducible expression systems.Background in molecular...  ...industry leading experts in protein degradation and molecular glues... 
    Suggested
    Summer holiday
    Local area

    Neomorph

    San Diego, CA
    5 days ago
  • $93.6k - $156k

     ...Development in La Jolla, CA is seeking a highly motivated scientist to join the Structural Biology and Protein Sciences (SBPS) Group within the Department of...  ...scientist with deep expertise in protein expression, purification, biophysical characterization, and... 
    Suggested
    Permanent employment
    Full time
    H1b
    Local area
    Worldwide
    Visa sponsorship
    Work visa
    Relocation package

    Pfizer

    San Diego, CA
    5 days ago
  • $52k - $57k

     ...looking to expand its capabilities in protein generation and analytical...  ...protein and other discovery reagents expression and purification, analytical assays of purified proteins...  ...hire, train and manage highly qualified scientists to perform laboratory services using... 
    Suggested
    Full time
    Contract work
    Worldwide

    Eurofins

    San Diego, CA
    3 days ago
  • $108.5k - $201.5k

     ...seeking a highly motivated ADME scientist for a laboratory-based role...  ...drug conjugates, therapeutic proteins, or other targeted delivery...  ...year. Principal Scientist II: $119,700 and $222,300 per year...  ..., gender identity or expression, marital or veteran status, disability... 

    Research

    San Diego, CA
    22 days ago
  • $118k - $145k

     ...seeking a highly motivated and skilled Scientist to join our Protein Sciences team and contribute to both...  ...and protein production in mammalian expression systems. The successful candidate...  ...while advancing developability and purification strategies for novel biologic formats... 
    Full time
    Local area

    AlivaMab Discovery Services

    San Diego, CA
    4 days ago
  •  ...Discovery Chemistry Department as a Senior Scientist I and work as part of a team to drive...  ...Responsibilities:Design, synthesis, purification and analysis of oligonucleotide-conjugates...  ...methods on antibodies (ADC, AOC), proteins, peptides, and other biomolecules.Hands... 
    Full time
    Temporary work
    Work at office
    Local area
    Monday to Friday
    Flexible hours
    Shift work

    ADARx Pharmaceuticals

    San Diego, CA
    4 days ago
  • $110.8k - $151k

     ...Role: We seek a Bioconjugation Sr. Scientist to join our Bioconjugates Research Group...  ...drug conjugates (ADC). Your expertise in protein and antibody conjugation will enable...  ...state-of-the-art bioconjugation methods, purification processes, and biophysical techniques... 
    Full time

    Neurocrine Biosciences, Inc.

    San Diego, CA
    more than 2 months ago
  •  ...collaborating closely with machine learning scientists, medicinal chemists and biologists to...  ...Enchant)Leverage and evolve our proprietary protein-ligand co-folding technology (...  ...ChemistryCompensationResearch Scientist II$124K - $156KSr Research Scientist$137K -... 
    Remote work
    Flexible hours

    Iambic Therapeutics

    San Diego, CA
    1 day ago
  •  ...biotechnology industry! In this position you will perform antibody purification via column chromatography both manually and automatically,...  ...antibodies * Possess both a basic understanding of antibody protein structures and how antibody purification is performed. * Perform... 
    Full time
    Work experience placement

    Planet Pharma

    San Diego, CA
    2 days ago
  • $129.6k - $158.4k

     ...Aspen Neuroscience is seeking a Scientist II, Bioinformatics QC to join our team. In this role you will be taking ownership of a critical...  ...genetics and genomics, including variant analysis, gene expression, and structural variation in applied settings Programming... 
    Full time
    Work at office
    Relocation
    Weekend work

    Aspen Neuroscience

    San Diego, CA
    a month ago
  • $80k - $130k

     ...Overview Research Scientist, Antibody Discovery and Research — Mapp Biopharmaceutical...  ...Optimizes and designs expression constructs for protein stability, solubility and expression...  ...mammalian and insect cell systems Protein purification, including experience with automated... 
    Full time
    Temporary work

    Mapp Biopharmaceutical Inc

    San Diego, CA
    4 days ago
  •  ...San Diego State University Research Foundation Research Scientist II US-CA-San Diego Job ID: 2026-20749 # of Openings: 1 Category: Research/Project Chemical Sciences Laboratory (CSL) Overview Under minimal or general guidance from the principal investigator, the Research... 
    Contract work

    University of Georgia- FACS

    San Diego, CA
    1 day ago
  •  ...biotechnology is seeking an entry-level Biochemist to perform protein conjugation and purification processes. The ideal candidate will have a Bachelor's...  .... Responsibilities include collaboration with scientists to evaluate conjugate performance and effective training... 

    Integrated Resources Inc.

    San Diego, CA
    2 days ago
  • $120k - $150k

     ...present in living cells that inhibits the expression of a specific gene, thereby affecting the production of a specific protein. Arrowhead’s RNAi-based therapeutics leverage...  ...Experience with antibody expression and purification using E. coli, HEK293, and CHO systems.... 
    Full time

    Arrowhead Pharmaceuticals

    San Diego, CA
    3 days ago
  • JOB SUMMARYWe are seeking a highly motivated, hands-on Research Scientist I/II with strong immunology training to join the Biology group and support small-molecule drug discovery programs at Iambic Therapeutics. The successful candidate will design and execute in vitro... 
    Flexible hours

    Iambic Therapeutics

    San Diego, CA
    4 days ago
  • JOB SUMMARYWe are seeking skilled scientists to join our Discovery Machine Learning group at Iambic Therapeutics. In this role, you will be...  ...TypeFull timeDepartmentScienceDiscovery Machine LearningCompensationResearch Scientist II$146.4K - $183KSenior Scientist$162.8K - $203.5K
    Flexible hours

    Iambic Therapeutics

    San Diego, CA
    2 days ago
  • $120k - $150k

     ...talented and committed students and postdocs into leading edge scientists. Leveraging the unique scientific environment of Scripps...  ...our transformative team. POSITION TITLE: Principal Scientist (Protein Immunotherapy) JOB SUMMARY: Calibr is seeking a talented Principal... 
    Flexible hours

    Calibr

    San Diego, CA
    5 days ago
  • $105k - $115k

     ...living cells that inhibits the expression of a specific gene, thereby...  ...production of a specific protein. Arrowhead’s RNAi-based therapeutics...  ...on the design, synthesis, purification, and characterization of...  ...candidate is an independent scientist with strong hands-on... 
    Full time

    Arrowhead Pharmaceuticals

    San Diego, CA
    3 days ago
  • $82.73k - $107.13k

    Overview WuXi Biology at San Diego, a division of WuXi AppTec Company, is seeking a highly motivated and established Scientist II with deep and broad expertise in drug discovery and cutting‑edge technologies in drug delivery with a focus on tLNP (targeted mRNA LNP) generation... 
    Work experience placement
    Work at office

    WuXi AppTec Group

    San Diego, CA
    5 days ago
  • $96k - $120k

     ...SUMMARYWe are seeking a highly skilled and motivated Senior Associate Scientist to join the Chemistry team at Iambic Therapeutics headquarters...  ...TypeOn-siteDepartmentScienceChemistryCompensationSr Associate Scientist I$84K - $105KSr Associate Scientist II$96K - $120K
    Flexible hours

    Iambic Therapeutics

    San Diego, CA
    5 days ago
  • Clinical Lab Scientist II - WD - San Diego, CA, Sunday to Thursday, 9:00 PM to 5:30 AMPay range: $52.55 - $58.40 / hour; employee may be eligible to receive shift differential of 10% for some or all hours worked on second shift and 15% for some or all hours worked on third... 
    Full time
    Part time
    Work experience placement
    Work at office
    Flexible hours
    Shift work
    Afternoon shift

    Quest Diagnostics

    San Diego, CA
    2 days ago
  • $100k

     ...related science field required.Licensure as Clinical Laboratory Scientist by the state of California required.Traveling between sites...  ...origin, disability status, sexual orientation, gender identity or expression, or any other characteristic protected by federal, state, or... 
    Local area
    Flexible hours

    Family Health Centers of San Diego

    San Diego, CA
    2 days ago
  • $93.25k - $112.99k

     ...personal lives. Read more: careers.bms.com/working-with-us . The Protein Homeostasis Thematic Research Center at BMS is a fundamental...  ...deemed undruggable. Position Summary The Associate Scientist will play a critical role in advancing translational research within... 
    Hourly pay
    Full time
    Temporary work
    Part time
    For contractors
    Summer work
    Live in
    Work at office
    Local area
    Remote work
    Flexible hours
    Shift work

    Bristol Myers Squibb

    San Diego, CA
    more than 2 months ago
  • $125k - $135k

     ...participate in assay optimizations, standardizations, and transfers to QC labs. This position will report directly to the Lead Senior Scientist in the Characterization and Flow Analytical Development team.​Duties/Responsibilities:· Contribute to experimental design and... 
    Flexible hours

    Artiva Biotherapeutics

    San Diego, CA
    1 day ago
  •  ...partners. Building on a strong legacy of success, we are currently seeking an outstanding individual to join our team as an Associate Scientist. • The candidate will be a key member of the Ion Channel/GPCR/Transporter Pharmacology group, and provide experimental support for... 
    Work at office
    Immediate start

    Artech

    San Diego, CA
    4 days ago
  • $85.7k - $128.5k

     ...seeks an on-site Principal Research Associate in Analytical Chemistry. The role supports medicinal chemistry through small molecule purification and analytical characterization, emphasizing expertise in HPLC and SFC purification. Ideal candidates will have a Master's with... 

    Vertex Pharmaceuticals

    San Diego, CA
    1 day ago
  • $93.25k - $112.99k

     ...personal lives. Read more: careers.bms.com/working-with-us . The Protein Homeostasis Thematic Research Center at BMS is a fundamental...  ...deemed undruggable. Position Summary The Associate Scientist will contribute to the Protein Homeostasis Thematic Research Center... 
    Hourly pay
    Full time
    Temporary work
    Part time
    For contractors
    Summer work
    Live in
    Work at office
    Local area
    Remote work
    Flexible hours
    Shift work

    Bristol Myers Squibb

    San Diego, CA
    more than 2 months ago
  • $126k - $234k

     ...an exceptional computational scientist like you to join our ranks....  ...Job Title: Senior Expert I/II, Data Science Position Location...  ...molecules, peptides, RNAs, protein degradation, molecular glues,...  ...orientation, gender identity or expression, marital or veteran status,... 

    Research

    San Diego, CA
    a month ago

Do you want to receive more vacancies?

Subscribe and receive similar vacancies to Scientist I/II, Protein Expression and Purification. Be the first to apply!