
Job description
The Microbiologist III is a senior individual contributor within the Microbiology laboratory and serves as a technical subject matter expert for microbiological testing, method qualification/validation, and aseptic manufacturing support. This role is responsible for independently executing microbiological studies and validations with minimal oversight and providing strong scientific and hands-on support to aseptic operations.
Independently perform and oversee microbiological testing, execute microbiological method qualifications and validations, serve as a technical SME for aseptic processing support, provide hands-on support for aseptic operations, analyze and interpret environmental monitoring and microbiological data, and support regulatory inspections.
This role requires advanced hands-on knowledge of pharmaceutical microbiological testing and aseptic processing principles, strong technical problem-solving skills, and excellent written and verbal communication skills. The ideal candidate will have a strong team-oriented mindset and be able to work effectively in a cross-functional, fast-paced manufacturing environment.
Company

Construction • Design
Siegfried is a leading multidisciplinary design and engineering firm serving Northern and Central California for more than 70 years. Based in Stockton with offices in Modesto, Sacramento, San Jose, and Truckee, the company delivers integrated civil, structural, geotechnical, and landscape architecture solutions, complemented by surveying, project management, sustainable design, and grant writing services. Leveraging deep technical expertise and a collaborative approach, Siegfried helps clients navigate complex projects, supports community growth and resilience, and provides hands‑on management, regulatory guidance, and innovative design backed by advanced technology.
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