Weekend Engineer Jobs in Massachusetts (NOW HIRING)

Commonwealth Fusion Systems is on a mission to deliver the urgent transition to fusion energy. Combining decades of research, top talent, and new technologies, we’re designing and building commercially viable fusion power plants. And we’re working with policymakers and suppliers to build the energy industry of the future. We’re in the best position to make it happen. Since 2018, we’ve raised nearly $3 billion in capital, making us the largest and leading private fusion company in the world. Now we’re looking for more thinkers, doers, builders, and makers to join us. People who’ll bring new perspectives, solve tough problems, and thrive as part of a team. If that’s you and this role fits, we want to hear from you.

We are seeking a hands‑on, detail‑oriented, innovative, and results‑driven Manufacturing Engineer to join our team. The successful candidate will be responsible for designing, implementing, and optimizing manufacturing processes to improve productivity, efficiency, and quality across the production line. You will be the magnet owner, holding overall accountability for this shift. This role involves close collaboration with design engineers, production staff, quality assurance, and supply chain teams.

Shift: Friday through Sunday, 6:00 pm - 6:00 am

$126,000 - 212,000 (includes 15% shift differential)

• Make real‑time decisions within established guardrails; escalating when conditions fall outside defined limits.
• Analyze and improve manufacturing processes to reduce costs, increase efficiency and ensure product quality.
• Develop and maintain process documentation including work instructions, SOPs, and process flow diagrams.
• Collaborate with product design and development teams to ensure manufacturability of new products.
• Implement Lean Manufacturing and Six Sigma methodologies to enhance production performance.
• Lead the design and procurement of tools, fixtures, and equipment required for efficient production.
• Troubleshoot equipment and process issues and implement corrective actions.
• Conduct time and motion studies to determine optimal production methods and labor utilization.
• Support continuous improvement initiatives and implement best practices across the facility.
• Ensure compliance with safety regulations, company policies, and industry standards.
• Evaluate new technologies and automation solutions to enhance manufacturing capabilities.

• Bachelor’s degree in Manufacturing Engineering, Mechanical Engineering, Industrial Engineering, or related field.
• 7+ years of experience in a manufacturing or production engineering role.
• Strong knowledge of Lean Manufacturing, Six Sigma, and quality systems.
• Proficient in CAD software (NX, SolidWorks, AutoCAD, etc.) and manufacturing ERP systems.
• Ability to balance autonomy with disciplined escalation.
• Leadership through hands‑on engagement.
• Excellent analytical and problem‑solving skills.
• Strong communication and teamwork abilities.
• Ability to work in a fast‑paced, team‑oriented environment.

• Knowledge of statistical process control (SPC) and failure modes and effects analysis (FMEA).

• Ability to lift up to 50 lbs occasionally.
• Perform activities such as typing, standing, stooping, and sitting for extended periods of time.
• Dedication to safety to mitigate hazards that may include heat, cold, noise, fumes, strong magnets, lead, high voltage, and cryogenics.
• Willingness to occasionally travel or work required nights, weekends or on‑call.

Salary range for this full‑time position + equity + benefits.

• Competitive compensation with equity.
• 13 company‑wide holidays.
• Flexible vacation days.
• 10 sick days.
• Generous parental leave policy.
• Health, dental, and vision insurance.
• 401(k) with employer matching.
• Professional growth opportunities.
• Team‑building activities.

At CFS, we excel in fast‑paced environments, driven by our values of integrity, execution, impact, and self‑critique. As we grow, we’re eager to bring on mission‑driven folks who offer diverse perspectives and fresh ways to tackle challenges.

We value diversity deeply and are proud to be an equal opportunity employer by choice. We consider all qualified applicants equally, regardless of race, color, national origin, ancestry, citizenship status, protected veteran status, religion, physical or mental disability, marital status, sex, sexual orientation, gender identity or expression, age, or any other basis protected by law.

This role requires compliance with U.S. laws concerning the export of controlled or protected technologies or information (“Export Control Laws”). Any offer of employment will be contingent on the need for compliance with such Export Control Laws.