Mechanical Engineer

AT Process Technologies; Waltham (MA); On-site; USD 110,000 - 140,000; Full time

Job summary

AT Process Technologies (ATP) is building a core team of engineers to deliver an autonomous skidded system for next-generation energetics manufacturing. You will own a subsystem from concept through commissioning, collaborating with R&D teams to design, test, and validate hardware.

The ideal candidate has 5+ years in hardware design, hands-on end-to-end ownership, and strong CAD skills with NX or Fusion 360, ready to work on-site in Massachusetts.

Qualifications

• Bachelor's degree in Mechanical Engineering, Chemical Engineering, Robotics, Mechatronics, or related discipline.
• 5+ years of hardware design and development experience.
• Proficiency in 3D CAD tools (Siemens NX or Fusion 360).
• Experience owning hands-on, end-to-end hardware development efforts (industry projects, design-build-fly, robotics, or similar).

Responsibilities

• Own the mechanical design and development of subsystem-level hardware from concept through pilot testing and production.
• Design and fabricate reactors and other continuous process systems.
• Work with a team of mechanical and process engineers to design, build, test, and commission hardware.
• Collaborate with automation and controls engineers on integrated system development.
• Lead hands-on testing, hardware iteration, and rapid prototyping based on performance feedback.
• Drive manufacturability, part selection, and tolerance stack-up decisions for scalable production.
• Conduct engineering analysis including stress, thermal, and fluid modeling; perform DFx reviews.
• Evaluate vendors, lead design reviews, and validate compliance and performance.
• Contribute to test plans, technical documentation, and engineering reviews.

Skills

3D CAD tools

Mechanical fundamentals

End-to-end hardware development

Python/C++ basics

Team collaboration

Education

Bachelor's degree in Mechanical Engineering or related

Tools

Siemens NX

Fusion 360

Job description

AT Process Technologies (ATP) is a pioneering manufacturing company focused on the development and deployment of modular energetics production plants. Using breakthrough chemistry and automation that operates continuously and generates little to no waste, ATP is expanding energetics production to meet the munitions demands of the US and Allies safely, rapidly, and cost effectively.

Summary

ATP is building a core team of engineers to work alongside our Process and Chemistry R&D teams to develop an autonomous skidded system for next-generation energetics manufacturing. In this role you will own and deliver a subsystem from concept through commissioning. The ideal candidate has previously owned a critical project end-to-end (design, build, and execution) and brings the engineering fundamentals to solve a wide range of problems quickly and rigorously.

Key Responsibilities

• Own the mechanical design and development of subsystem-level hardware from concept through pilot testing and production
• Design and fabricate reactors and other continuous process systems.
• Work alongside a team of mechanical and process engineers to design, build, test, and commission hardware
• Collaborate with automation and controls engineers on integrated system development
• Lead hands-on testing, hardware iteration, and rapid prototyping based on performance feedback
• Drive manufacturability, part selection, and tolerance stack-up decisions for scalable production
• Conduct engineering analysis including stress, thermal, and fluid modeling; perform DFM and DFMEA
• Evaluate vendors, lead design reviews, and validate compliance and performance
• Contribute to test plans, technical documentation, and engineering reviews

Required Qualifications

• Bachelor's degree in Mechanical Engineering, Chemical Engineering, Robotics, Mechatronics, or a related discipline
• 5+ years of professional experience in hardware design and development
• Strong proficiency in 3D modeling and CAD tools (Siemens NX, Fusion 360, or equivalent)
• Demonstrated application of mechanical fundamentals - structural, thermal, and materials - to deliver robust, well-engineered designs
• Demonstrated experience owning hands-on, end-to-end hardware development efforts (industry projects, FSAE, Design-Build-Fly, rocketry teams, or similar)

Preferred Qualifications

• 5-10 years of relevant industry experience
• Background in robotics, PLCs, mechatronics, or process development
• Experience with continuous processes and manufacturing
• Familiarity with at least one programming language (Python, C++, or similar)
• Experience designing hardware for reactive, hazardous, or energetic chemistries

Additional Requirements

• Ability to lift 50 lbs
• U.S. Person and ability to obtain a security clearance
• Ability to work on-site and travel as needed

ITAR Requirements

This position requires access to information and technology protected under U.S. export control laws and regulations, including the International Traffic in Arms Regulations (ITAR) and the Export Administration Regulations (EAR). To conform to these regulations, applicants must be a "U.S. Person" as defined by 22 CFR § 120.62, which includes (i) U.S. citizens or nationals, (ii) U.S. lawful permanent residents (green card holders), (iii) refugees under 8 U.S.C. § 1157, or (iv) asylees under 8 U.S.C. § 1158.

Equal Employment Opportunity

AT Process Technologies is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability, or protected veteran status

Reasonable Accommodation

If you need a reasonable accommodation during the application or interview process, please contact [e-mail].

E-Verify

AT Process Technologies participates in E-Verify to confirm employment eligibility for all newly hired employees.