Phoenix Tailings · 6 hours ago
2.1 Senior Process Engineer – Extraction
Burlington, MA
Full-time
Hybrid
Senior Level
7+ years expPhoenix Tailings is a rapidly growing clean mining and metals production startup dedicated to sustainable and economic critical metals production. They are seeking a Senior Process Engineer to lead process design and scale-up of mining and metals operations from pilot to commercial production, ensuring reliable and efficient systems for critical metals supply.
Advanced MaterialsCleanTechIndustrialManufacturingMiningSustainabilityWaste Management
Responsibilities
Lead process design and scale-up of mining and metals operations from pilot to commercial production
Own mass and energy balances across complex, multi-step processing flowsheets
Define process architecture, operating envelopes, and design criteria to enable reliable, continuous operation
Drive process optimization to increase throughput, recovery, and overall system efficiency
Identify and mitigate scale-up risks related to materials handling, kinetics, residence time, and process control
Support equipment sizing, selection, and specification for large-scale metals processing systems
Develop and review process flow diagrams (PFDs), design bases, and technical documentation for internal and external stakeholders
Partner with operations and leadership to support commissioning, ramp-up, and steady-state performance
Qualification
Required
Bachelor's or Master's degree in Chemical Engineering, Metallurgical Engineering, or a related discipline
7+ years of experience in process engineering within mining, metals, or extractive industries
Demonstrated experience scaling mineral processing or metallurgical systems from pilot or demonstration scale to commercial operation
Strong command of mass balances, process modeling, and flowsheet development
Experience with hydrometallurgical, pyrometallurgical, or combined processing routes for metals production
Proven ability to diagnose process bottlenecks and implement scalable, data-driven solutions
Comfortable operating in fast-moving environments where process design and execution evolve rapidly
Benefits
100% Medical, dental, and vision coverage
Ownership in a fast-growing venture-backed company.
Parental leave and flexibility for families.
Flexible vacation policy to encourage people to get out and see the world.
Regularly scheduled events, and celebrations.
Learning and development Opportunities to grow your skills and career.
Working with fun, hard-working, kind people committed to making a difference!
We are results-focused. We don’t work at the office every day.
Company
Phoenix Tailings
Phoenix Tailings is a metals-refining company that transforms mining waste (“tailings”) into usable rare earth and critical metals.
51-200 employees
H1B Sponsorship
Phoenix Tailings 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 (1)
2024 (3)
2023 (1)
2022 (1)
Funding
Current Stage
Growth StageTotal Funding
$104.24MKey Investors
ARPA-EEnvisioning PartnersMassVentures
2025-12-25Series B
2025-12-04Grant· $1.6M
2025-04-30Series B· $33M
Leadership Team
Nicholas Myers
CEO & Co-Founder
Anthony Balladon
Chief Commercial Officer & Co-Founder
Recent News
2025-12-30
2025-12-29
Company data provided by crunchbase