Senior Laboratory Technician (Lab Tech Sr.)

Position Overview

Viltis is seeking a Senior Laboratory Technician to support a client’s toxicology laboratory operations in Santa Rosa, CA. The role involves processing GC/MS and/or LC/MS/MS data after instrumental analysis for drugs of abuse, reviewing analytical data, verifying sample and batch accuracy, generating reports, entering results into the Laboratory Information System (LIS), and maintaining appropriate Chain of Custody documentation. This position is ideal for candidates with a bachelor’s degree in chemistry, biology, analytical chemistry, or a related scientific discipline who want hands‑on experience in a regulated analytical laboratory environment.

Key Responsibilities

• Read, understand, and follow established Standard Operating Procedures (SOPs).
• Correctly identify analyzed samples and verify the accuracy of sample sequences for each batch.
• Process acquired GC/MS and/or LC/MS/MS instrument data and generate appropriate reports.
• Conduct the first review of analytical data according to applicable assay SOPs.
• Transcribe or upload analytical results into the Laboratory Information System (LIS) for final review and certification.
• Maintain accurate and complete Chain of Custody batch documentation.
• Communicate effectively with supervisors and promptly escalate emerging issues or challenges.
• Follow laboratory safety requirements and maintain a safe and healthy working environment for yourself and coworkers.
• Work safely with biological specimens, chemicals, laboratory equipment, and analytical instruments.

Required Qualifications

• Bachelor’s degree in Chemistry, Analytical Chemistry, Biology, or a related scientific field.
• Ability to safely work with biological specimens, chemicals, laboratory equipment, and instrumentation.
• Ability to read, understand, and consistently follow written procedures and SOPs.
• Strong attention to detail and ability to accurately document and review laboratory data.
• Availability to work the required Tuesday‑through‑Saturday, 8:00 AM – 4:30 PM schedule.

Preferred Qualifications

• Previous laboratory experience working with biological specimens.
• Experience with analytical laboratory instrumentation.
• Experience with LC/MS/MS and/or GC/MS systems or associated analytical data.
• Familiarity with laboratory information systems (LIS), regulated laboratory documentation, or Chain of Custody procedures.

Pay

$20.00 – $22.50 per hour.

Schedule

Tuesday – Saturday, 8:00 AM – 4:30 PM (40 hours per week). On‑site in Santa Rosa, CA 95403.