7.3. Mechanical Engineer II

Phoenixtailings; Burlington (MA); On-site; USD 90,000 - 120,000; Full time

Benefits offered by this job

100% medical, dental, and vision coverage

Ownership in the company

Unlimited PTO

Learning and development opportunities

Job summary

Phoenixtailings is seeking a Mechanical Engineer II located in Burlington, Massachusetts. You will design and commission innovative processing equipment, driving projects from concept through deployment in a dynamic R&D environment.

Candidates should have a Bachelor’s in Mechanical Engineering, with over 3 years of experience and strong SolidWorks skills. The competitive pay range for this role is $90,000–$120,000, including equity options and benefits such as unlimited PTO and full healthcare coverage.

Qualifications

• 3+ years of mechanical engineering experience designing and commissioning complex equipment.
• Experience developing verification and validation test plans.
• Hands-on experience with mechanical tooling and equipment troubleshooting.

Responsibilities

• Own mechanical systems from concept to deployment.
• Design novel processing equipment for high-temperature technologies.
• Create 3D CAD models and technical documentation.

Skills

Mechanical Engineering

SolidWorks

Hands-on experience

V-Model (V-Diagram)

Data analysis

Education

Bachelor’s degree in Mechanical Engineering or related discipline

Tools

SolidWorks

Job description

Who We Are Looking For

Phoenix Tailings is looking for a Mechanical Engineer II to help take next‑generation processing equipment from concept to deployment. In this role, you will design, build, test, validate, and commission complex mechanical systems that support high‑temperature electrolysis, furnace technologies, and innovative electrochemical and thermal processes. This is a hands‑on engineering role for someone who thrives in a fast‑paced R&D environment and is excited by the challenge of turning ambitious concepts into reliable, deployed hardware. You will work on first‑of‑a‑kind equipment that combines mechanical, thermal, vacuum, and process engineering to solve complex challenges at the forefront of industrial decarbonization, advanced manufacturing, and critical metals production.

Responsibilities

• Own mechanical systems and equipment from early concept development through design, fabrication, testing, commissioning, and deployment.
• Design and develop novel processing equipment for high‑temperature electrolysis, furnace systems, and critical metals production technologies.
• Create 3D CAD models, assemblies, drawings, and technical documentation using SolidWorks to support fabrication, procurement, assembly, installation, and commissioning.
• Select and specify critical mechanical components and mechanisms, including pumps, bearings, lead screws, actuators, seals, thermal components, fixtures, and industrial hardware based on engineering analysis and test data.
• Develop and execute verification and validation plans for components, subsystems, and integrated equipment to prove performance, reliability, and readiness for deployment.
• Use Design of Experiments, structured testing, and data analysis to validate new concepts, troubleshoot equipment performance, and make sound engineering decisions.
• Build, assemble, modify, and commission mechanical tooling, fixtures, prototypes, and pilot‑scale equipment in hands‑on lab, R&D, and production environments.
• Apply V‑Model system development principles to connect requirements, system architecture, detailed design, integration, testing, validation, and deployment.
• Investigate mechanical, thermal, vacuum, and process‑related issues, identify root causes, and implement practical design improvements that move technology forward.
• Drive rapid design‑build‑test iterations with urgency while maintaining sound engineering judgment, safety, and documentation discipline.

Qualifications

• Bachelor’s degree in Mechanical Engineering or a related engineering discipline.
• 3+ years of mechanical engineering experience designing, building, testing, and commissioning complex equipment, industrial systems, process hardware, or R&D systems.
• Familiarity with V‑Model (V‑Diagram) based system development methodologies.
• Strong SolidWorks experience, including part design, assemblies, detailed drawings, and design documentation for fabrication and assembly.
• Experience developing and executing test plans for system, subsystem, or component verification and validation.
• Experience selecting and integrating mechanical components such as pumps, actuators, bearings, lead screws, seals, fasteners, thermal systems, and industrial hardware.
• Hands‑on experience with mechanical tooling, fixtures, prototype assembly, equipment troubleshooting, and commissioning in a lab, pilot, manufacturing, or industrial environment.
• Able to wear a respirator.
• Ability to lift up to 50 lbs.

This pay range reflects best estimate for the total cash compensation which includes salary + discretionary bonus for this role. Total package may vary based on experience and qualifications.

Compensation

Pay Range: $90,000–$120,000 total cash compensation plus equity.

Benefits

• Healthcare: 100% medical, dental, and vision coverage for employee.
• Stock Options: Ownership in a fast‑growing venture‑backed company.
• Time Off: Unlimited PTO.
• Learning: Learning and development opportunities to grow your skills and career.