Job Description

The Microbiologist is responsible for performing microbiological testing accurately, on time, and in compliance with established methods, aseptic practices, and regulatory requirements. The role works across the microbiology workflow - from sample preparation through plating, incubation, reading, and data entry - and contributes to media production, instrument upkeep, and a clean, compliant lab.

Reporting to the Supervisor - Microbiology, the Microbiologist executes routine and more complex microbial testing, prepares media and samples, operates and maintains instrumentation, and records results with strong documentation discipline. This is a hands-on bench role that keeps the workflow moving while upholding the aseptic discipline and timing precision that microbiological testing demands.

We are looking for someone technically capable and detail-oriented - a careful, process-disciplined bench scientist who executes accurately, communicates issues early, supports continuous improvement, and helps develop less-experienced team members.

1. Sample Preparation & Microbial Testing

• Perform sample preparation - homogenization, weighing, and documentation of sample weights - for microbial analysis, following SOPs.
• Prepare media, broths, and agars; perform serial dilutions, inoculate samples, and incubate per method requirements.
• Read and record plating results, count colonies (manually and via plate reader), and calculate CFU/ g.
• Support qPCR/PCR testing preparation and execution.

• Organize, label, and store samples; prioritize preparation and retests based on testing schedules and deadlines.

2. Instrument Operation & Maintenance

• Operate laminar flow hoods, plate readers, incubators, PCR instruments, and related equipment.
• Perform routine maintenance, cleaning, calibration, and diagnostics; record on bench sheets and incubation logs.

• Monitor instrument performance during runs, perform basic troubleshooting, and escalate issues as needed.

3. Data Processing & Documentation

• Enter and track sample data in the LIMS accurately and on time; upload data and confirm retest needs with Data Review.
• Examine blanks and controls for contamination; spot-check calculations for accuracy and data integrity.

• Record retests in the retest log and communicate sample delays to the Supervisor and Client Services.

4. Method Support & Continuous Improvement

• Support the implementation, optimization, and validation of plating and microbial methods under the direction of the Supervisor.

• Contribute to process improvements and testing efficiency.

Secondary Roles & Responsibilities

1. Lab Upkeep & Compliance

• Maintain a clean, sanitary, aseptic workstation; complete daily and weekly cleaning tasks; dump samples and support disposal efforts.

• Uphold environmental controls and contamination-prevention practices.

2. Inventory & Equipment Management

•Monitor and audit stock levels of reagents, consumables, and instrument parts; perform and record routine pipette and dispensette checks; flag discrepancies to the Inventory team.

3. Collaboration & Additional Responsibilities

• Work closely with the Supervisor and team, and mentor and support less-experienced microbiologists.

• Perform additional duties as the role evolves or as directed by the Supervisor - Microbiology or laboratory management.

#LI-CB1

• B.S. in Microbiology, Biology, Medical Laboratory Science, or a closely related science discipline; or equivalent combination of education and relevant laboratory experience.
• Experience with, or strong foundational knowledge of, microbiological testing techniques - aseptic technique, media preparation, plating, serial dilutions, and incubation.
• Familiarity with SOP-driven workflows, LIMS systems, and good laboratory practices (GLP).
• Strong attention to detail, organization, and documentation discipline.
• Ability to manage time-sensitive workflows and meet turnaround targets.

• Strong written and verbal communication skills.

Preferred

• Experience in a contract laboratory or regulated testing environment (dietary supplements, food and beverage, cosmetics, or pharmaceutical).
• Familiarity with compendial microbiological methods (USP <61>, <62>, <2021>, <2022>, AOAC, BAM, ISO, or equivalent).
• Experience with qPCR/PCR methods and plate-reader systems.
• Experience with environmental monitoring programs.

Experience mentoring or training junior team members

With a legacy spanning more than 80 years, NSF leverages science and innovation to improve human and planet health. We provide science-driven, independent testing, inspection, certification, and advisory services and develop the very standards that drive the food, water, and life sciences industries worldwide. We empower our clients to navigate shifting regulations to improve consumer health, safety, and quality of life.

One of our core values is We Are One NSF. This means that while we’re one team, we embrace the cultural, ethnic, language, and demographic diversity that reflects the societies in which we live and work.

Come join a team that makes a difference in the world. More information about NSF can be found at nsf.org.

NSF is an equal opportunity employer. All qualified applicants will receive consideration for employment without regard to, among other things, race, color, religion, sex, sexual orientation, gender identity, national origin, age, status as a protected veteran, or disability.

Notice to Agency and Search Firm Representatives: Please note that NSF is not accepting unsolicited resumes from agencies/search firms for this role. Resumes submitted to an NSF employee by a third-party agency without a valid written & signed search agreement between NSF and said third-party agency will become the sole property of NSF. No fee will be paid if a candidate is hired as a result of an unsolicited agency or search firm referral. Thank you.