# Process Engineer at Mariana Minerals

Process Engineer at Mariana Minerals in Joaquin, TX. On-site, full-time. Posted August 24, 2026.

- Company: Mariana Minerals
- Location: Joaquin, TX
- Workplace: On-site
- Job type: Full-time
- Experience: 3+ years
- Posted: 2026-08-24
- Apply: https://jobs.ashbyhq.com/marianaminerals/a61ece5b-1e04-420e-8504-ae594149be52/application
- Source: https://jobmagic.ai/jobs/process-engineer-mariana-minerals-b8rg8q

## Requirements

- A bachelor’s degree in chemical engineering or a related discipline is required.
- 3-5 years of experience in Chemical Process and/or Development Engineering required.
- Hands-on experience scaling processes from R&D to an operating environment.
- Expertise in process modeling, development, control, and scale-up.
- Coordinate and execute bench-top, pilot, manufacturing scale-up, and verification batches with speed and robustness.
- Proficient in using software for process analysis and modeling.
- Sound understanding of chemical processes and their scale-up.
- Strong leadership and interpersonal skills for implementation of cross-functional process improvements.
- Strong background in analytical & quantitative skills for problem-solving of large/complex problems & proven ability in decision-making

## 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.
**Position Summary:**
We are looking for a Senior Process Engineer to work with our innovative, fast-paced multidisciplinary team. They will be responsible for liaising between R&D and operations, with a focus on chemical process development, successful scale-up of new product execution, and sustaining technology-manufacturing readiness. This person must be flexible, proactive, and professional with experience in scale-up and process development applications such as chemical refining, hydrometallurgy, minerals, and chemical processing.

**Key Responsibilities:**

- Lead the development and scale-up of lab processes on pilot and production scales, with a focus on improving metal recovery and reducing cost and environmental impact.

- Identify potential process risks, and propose, and evaluate solutions to mitigate the risks.

- Evaluate process capability, improve process control, and deliver samples to customers.

- Conduct detailed process simulations and modeling to predict process behaviors under various scenarios.

- Develop, prepare, and provide detailed production and process guidelines, including: standard operating procedures (SOPs), process flow details, safety, and quality standards.

- Improve and troubleshoot products, equipment, and process issues during production.

- Provide technical leadership and mentorship to junior scientists, engineers, and technical staff.

- Guide the R&D team and any external partners in the design and execution of experiments to develop the required base data for chemical process design.

- Drive chemical process design and development from the concept stages to scaled production, ensuring quality is maintained throughout the lifecycle of the project.

- Develop and model potential process designs for scale-up and cost estimating based on lab-scale chemical processes.

- Identify potential process risks, and propose, and evaluate solutions to mitigate the risks.

- Evaluate process capability and improve process control.

**Required Qualifications:**

- A bachelor’s degree in chemical engineering or a related discipline is required.

- 3-5 years of experience in Chemical Process and/or Development Engineering required.

- Hands-on experience scaling processes from R&D to an operating environment.

- Expertise in process modeling, development, control, and scale-up.

- Coordinate and execute bench-top, pilot, manufacturing scale-up, and verification batches with speed and robustness.

- Proficient in using software for process analysis and modeling.

- Sound understanding of chemical processes and their scale-up.

- Strong leadership and interpersonal skills for implementation of cross-functional process improvements.

- Strong background in analytical & quantitative skills for problem-solving of large/complex problems & proven ability in decision-making

**Desired Qualifications:**

- Hydrometallurgy experience

- Mining experience

- Battery material experience

### **Our culture is built on four principles:Everyone Gets Home Safe. **We never put speed or cost ahead of people.
**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!**