Mariana Minerals ยท 1 day ago
Senior Process Engineer
San Francisco, CA
Full-time
Onsite
Mid, Senior Level
$85K/yr - $150K/yr
5+ years expMariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. The role involves leading the design, deployment, and operation of innovative refining processes for critical minerals while supporting software development for automated plant optimization.
Mining & Metals
Responsibilities
Work closely with Pilot Plant Technicians to operate, maintain, troubleshoot, and improve pilot-scale processing equipment
Design experiments to evaluate process performance, recovery, throughput, and product quality
Create and maintain key engineering and operational documentation such PFDs, HMBs, P&IDs, Operating Procedures, and Process Control Narratives
Lead equipment design scopes from concept, through procurement, fabrication, installation, commissioning, and handover to Operations
Work closely with cross-functional teams including R&D, commercial plant design engineers, project execution teams, and more to scale designs from lab to the pilot to production scale
Work closely with the software and machine learning teams to develop and implement reactor and plant optimization algorithms
Qualification
Required
B.S., M.S., or PhD in Chemical Engineering or related field
Minimum of 5 years of experience supporting R&D scale up, pilot plant operation, and/or commercial production in minerals processing, chemicals, specialty materials, oil & gas, or similar industry
Strong understanding of reaction engineering, solid-liquid separation, leaching, solvent extraction, and/or similar unit operations
Hands-on experience designing, commissioning, and starting up pilot plant or commercial scale equipment
Ability to design experiments, problem-solve, and analyze complex datasets
Strong commitment to Health & Safety and experience with risk management, management of change, and hazard assessment
Excellent technical writing, communication, and teamwork skills
Comfort working in fast-paced, cross-functional environments
Company
Mariana Minerals
Mariana Minerals is a software-first, vertically integrated minerals company focused on supplying the minerals critical to modern energy, AI, and defense technologies.
11-50 employees
H1B Sponsorship
Mariana Minerals has a track record of offering H1B sponsorships. Please note that this does not
guarantee sponsorship for this specific role. Below presents additional info for your
reference. (Data Powered by US Department of Labor)
Distribution of Different Job Fields Receiving Sponsorship
Represents job field similar to this job
Trends of Total Sponsorships
2025 (7)
Funding
Current Stage
Early StageCompany data provided by crunchbase