Bots Unlimited · 2 weeks ago
Sr. Mechanical Engineer - Electromechanical Subsystems
San Antonio, TX
Full-time
Onsite
Senior Level
5+ years expBots Unlimited is a San Antonio based product development and hardware company that designs, produces, and supports high performance technology for drones, robotics, automation, and edge AI systems. They are seeking a highly experienced Senior Mechanical Engineer - Electromechanical Subsystems to lead mechanical design and support the full mechanical design lifecycle for their electromechanical products.
Consumer Goods
Responsibilities
Develop 3D CAD models and detailed mechanical assemblies for motors, housings, rotor/stator sub-assemblies, shafts, bearings, and related components
Produce full mechanical drawings: dimensioned parts, GD&T, tolerance stacks, material specifications, surface-finish and plating/coating details
Manage and maintain mechanical data and revision control in our PLM system (e.g. Duro or equivalent)
Create manufacturing-ready documentation (BOMs, vendor quotes, machining/assembly work instructions, QC/inspection checklists)
Perform DFM/DFMA reviews to ensure designs are optimized for cost, manufacturability, and reliability
Collaborate with electrical/firmware teams to ensure mechanical design supports motor performance, thermal requirements, and integration with ESC/housing
Interface with vendors and manufacturing partners: issue RFQs, review vendor drawings, negotiate tolerances, and coordinate prototype builds
Lead mechanical validation testing: oversee prototypes, manage assembly/disassembly, coordinate with test lab, and record physical test data (vibration, torque, RPM, thermal)
Support product release: ensure all mechanical deliverables are complete for first-article inspection, pre-production, and mass production handoff
Mentor or guide less-senior mechanical/design engineers where applicable
Qualification
Required
Bachelor's or Master's degree in Mechanical Engineering, Mechanical Design, or equivalent engineering discipline
Minimum 5-10 years of mechanical design experience, with substantial time spent designing rotating equipment, motors, or mechanical powertrain components (shafts, bearings, housings, etc.)
Expert proficiency in 3D CAD software (e.g. SolidWorks, Autodesk Inventor, Creo, etc.) — able to create complex assemblies and prepare detailed 2D drawings with GD&T
Solid understanding of GD&T, tolerance analysis, material properties, surface finish, coatings/plating, fasteners, and mechanical fit/clearance principles
Proficiency in using standard mechanical engineering tools and instruments such as calipers, micrometers, gauges, dial indicators, and other measurement or inspection tools required for prototype validation, fit/clearance checks, and vendor QA collaboration
Experience with PLM or PDM systems (e.g. Duro, Windchill, Arena, similar) to manage part revisions, BOMs, and release workflows
Familiarity with manufacturing processes: CNC machining, sheet-metal, casting, magnet assembly/stacking, rotor balancing, assembly tolerances, vendor sourcing
Strong documentation skills: ability to draft manufacturing instructions, inspection checklists, QC requirements, and vendor drawing packages
Experience working with or specifying bearings, shafts, rotor-stator assemblies, magnets, housings, and mechanical/magnetic tolerances relevant for motor design
Ability to collaborate with multidisciplinary teams (electrical, firmware, mechanical, quality) and vendors to drive designs through to production
Excellent communication skills (written and verbal), and ability to work onsite in San Antonio — vendor visits and hands-on builds expected
Willingness to travel periodically throughout the year to support key product milestones and collaboration efforts. Examples include visiting manufacturing partners for first article builds, production testing, and process improvements; traveling to design partners for technical alignment or strategy meetings; and attending select trade shows or industry events to support product demonstrations or team visibility
Preferred
Prior experience designing or supporting brushless DC motors, electric motors, or electromechanical actuators / gear-driven mechanisms
Experience with rotor balancing, vibration analysis, shaft alignment, and mechanical durability / lifecycle testing
Familiarity with motor housings, magnet assemblies, stator laminations, and shielding or coating processes (paint, plating)
Previous experience with supplier sourcing, vendor negotiations, vendor-managed manufacturing, or DFM with overseas manufacturers
Background in design for assembly (DFA), design for manufacturing (DFM), cost-driven design optimization
Experience writing or reviewing first-article inspections, quality control plans, tolerance audits, and mechanical verification documents
Familiarity with rotating systems standards and safety requirements (e.g. balancing, critical speed, vibration, run-out tolerances, rotational safety considerations)
Benefits
Comprehensive medical plans with Rx
100% employer paid dental and vision insurance premiums
Automatic 401k employer contribution with vesting
Paid vacation and personal time off
11 Paid holidays
5 days of sick leave
Company
Bots Unlimited
2-10 employees
Funding
Current Stage
Early StageCompany data provided by crunchbase