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Weekend Stoichiometry Jobs (NOW HIRING)

Weekend Stoichiometry information

See salary details

$81K

$140.1K

$250.5K

How much do weekend stoichiometry jobs pay per year?

As of Aug 16, 2026, the average yearly pay for weekend stoichiometry in the United States is $140,098.00, according to ZipRecruiter salary data. Most workers in this role earn between $98,000.00 and $170,500.00 per year, depending on experience, location, and employer.

What are the most commonly searched types of Stoichiometry jobs?

The most popular types of Stoichiometry jobs are:

Pilot Plant Technician (Weekend Shift)

Mariana Minerals

San Francisco, CA • On-site

Full-time

Posted 15 days ago


Job description

About Mariana Minerals
Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We're reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making.
The Role
Mariana Minerals is looking for a highly motivated technician to join our San Francisco Pilot Plant team. You will support the design, deployment, and operation of first-of-its-kind refining processes for critical minerals, while also supporting development of software for automated plant optimization. This position is highly hands-on and will play a critical role in bridging R&D and Operations, ensuring processes are robust, safe, cost-effective, and suitable for commercial production.
What You'll Do
  • Assist engineers and other technicians to operate and monitor chemical processes such as precipitation, filtration, ion exchange, and membrane concentration.
  • Safely handle chemicals, raw materials, and waste streams in compliance with SOPs and regulations
  • Support sampling, quality checks, and basic laboratory measurements
  • Assist with design, install, startup, and commissioning of new equipment and processes
  • Take ownership of plant cleanliness and organization, ensuring work areas, tools, and equipment are well-maintained and ready for operations
  • Perform routine maintenance, inspections, and basic mechanical repairs; document findings & actions in a Computerized Maintenance Management System (CMMS)
  • Create and maintain procedures, experimental records, shift reports, and other critical operations documents
Shift Schedule
  • Weekend Days: Friday, Saturday, Sunday, and Monday 10 hours shifts: 6AM - 4PM

Desired Qualifications
  • Associate degree, technical certificate, or equivalent experience in chemical technology, process technology, industrial operations, or a related field
  • 3+ years of experience operating pilot plant or commercial scale industrial equipment in the minerals processing, chemicals, specialty materials, oil & gas, biotech, or similar industry
  • Prior exposure to core plant safety work processes such as Lockout/Tagout (LOTO), hot work permitting, confined space entry, and safe work permitting systems
  • Experience using human-machine interfaces (HMIs) and plant software systems to monitor, control, and adjust process operation
  • Experience with hands-on equipment installation, modification, and troubleshooting
  • Basic knowledge of inorganic chemistry, pH, and reaction stoichiometry a plus
  • Experience using engineering documents such as PFDs, control narratives, or P&IDs is a plus
  • Climb stairs, stand for extended periods of time, and safely lift up to 50 lbs
Our culture is built on three principles:
Extreme Ownership - We take full responsibility for outcomes, relentlessly driving toward solutions.
Engineer Out Requirements, then Automate - We simplify, optimize, and then automate for scale.
Share Your Legos - We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.
Join us as we build the future of responsible mineral sourcing and supply.