Senior Industrial Engineer

About Mainspring Mainspring Energy manufactures and delivers fuel-flexible, low-emissions local power solutions that rapidly add new capacity and deliver reliable, affordable, and sustainable electric power. The company began commercial shipments of its Mainspring Linear Generators in 2020 and today has hundreds of megawatts in advanced development and field operations for leading Fortune 500 companies, data centers, and utilities. Mainspring also partners with global energy leaders including AEP, NextEra Energy Resources, Schneider Electric, and more. The core values that ground our work, guide our decisions, and connect us together: Pragmatic Optimism Excellence without Ego Proactive Collaboration

Job Overview Mainspring Energy builds linear generators that change how the world gets dependable, clean power. We are scaling up manufacturing in Monterrey, and we're looking for a Senior Industrial Engineer to help design our next production lines.

You will drive key parts of line design: breaking the assembly process into balanced stations, sizing operator count and station quantity, defining the line flow, and checking it through simulation before anything is built on the floor.

The ideal candidate has designed production lines before and is comfortable with virtual manufacturing tools. They should also be able to turn takt time, product routings and capacity targets into a line layout that is efficient, scalable and ready to build.

Your work will help shape how our products get built for years to come and will directly enable Mainspring's aggressive growth targets.

Responsibilities - End-to-end design of assembly and production lines

- Break the work down station by station: define work content, sequence, and precedence for each operation

- Calculate takt time, cycle times, number of stations, and operator headcount needed to meet volume targets

- Perform line balancing to reduce idle time and bottlenecks and to get the most labor and equipment out of the line

- Design the line flow and layout, including station placement, buffers, WIP strategy, and operator movement

- Build and run discrete-event simulations and virtual manufacturing models to check capacity, find constraints, and compare layout options before investing

- Define equipment, tooling, and fixture needs for each station, working with suppliers and internal teams

- Build capacity models and scenarios for volume ramps and future product changes

- Work with Design Engineering, Quality, Test, and Operations to build DFM/DFA input into the line design

- Create standard work, and line design specifications for launch

- Support line installation, commissioning, and ramp-up, then improve performance after Launch

Qualifications - Bachelor's or Master's degree in Industrial, Mechanical, or Manufacturing Engineering, or a related field

- 5–8 years of experience in manufacturing engineering, with direct experience designing production lines

- Proven track record of launching assembly lines, including station design, line balancing, and headcount planning

- Hands-on experience with simulation and virtual manufacturing tools (e.g., Siemens Plant Simulation, Process Simulate, FlexSim, Arena, Simio, AnyLogic, DELMIA, or similar)

Required Skills & Competencies - Strong command of line balancing, takt time analysis, time studies (MTM/MOST a plus), and capacity planning

- Experience designing line flow and factory layouts for assembly operations

- Proficiency in CAD (2D/3D) for layout and station design

- Solid knowledge of Lean Manufacturing: VSM, Standard Work, flow and pull systems, 5S, Poka-Yoke

- Strong analytical, data-driven mindset; comfortable building models in Excel/Python or similar

- Excellent communication skills to present line design proposals to cross-functional teams and leadership

- Fluent in English and Spanish

- Willing and able to travel internationally

Preferred Skills & Competencies - Experience with material flow, such as intra