Senior Mechanical Engineer

***We are unable to work with 3rd-party or corp-to-corp candidates for this position*** Overview :Our client will be hiring a Senior Mechanical Design Engineer with a strong background in mechanical design, thermodynamics, fluid flow and structural analysis. The role will focus on R&D of advanced battery power module technology to ensure performance, reliability and cost. The deliverables will require significant input into the mechanical design: structural and fluidic analysis, testing and validation, prototyping, specification creation and implementation, quality support, etc. The ideal candidate will have a passion for sustainability and the environment, will thrive in a fast-paced entrepreneurial setting, be self-motivated, and have an interest in disruptive, cutting-edge technology.This position is 100% onsite in Wilsonville, Oregon. This role will work with 2 Mechanical Engineers on the team.Responsibilities :Senior contributor to the mechanical design of stack and subsystem hardware (manifolds, flow fields, plates, frames, enclosures, seals) using 3D CAD and rigorous design control (models, drawings, specs, BOMs; GD&T).Analyze and optimize thermal/fluid performance and structural integrity (pressure/temperature/vibration/thermal cycling) using FEA/CFD. Translate insights into robust design updates.Engineer for manufacturability and reliability (DFM/DFA/DFR) across casting, machining, plastics (injection molding, extrusion, plastics welding), and sealing processes (welding, adhesives, gaskets).Select materials compatible with electrolytes and corrosive environments; address creep, fatigue, and stress-relaxation mechanisms with appropriate safety margins and life predictions.Correlate models to test: develop validation plans, define test articles/fixtures, analyze data, close the loop to simulation, and drive root-cause and corrective actions.Collaborate across all engineering and supply chain teams to convert performance targets into durable, cost-effective designs ready for production.Continuously improve cost, reliability, and serviceability while maintaining safety, compliance, and quality standards.Qualifications :B.S. in Mechanical Engineering5 years of experience in mechanical design and analysis of complex fluid or electrochemical systemsExperience with thermodynamics, fluid mechanics, and solid mechanics, with hands-on FEA/CFD and tolerance stack-ups.Experience with material properties, cell design, strength analysis.Proficiency in 3D CAD (Inventor, SolidWorks, or equivalent) for parametric design, detailed drawings, and BOMs.Preferred :M.S. in Mechanical, Materials Science, Energy Systems, or Chemical Engineering.Experience designing for corrosive or reactive fluids and hermetic sealing (welds, adhesives, gaskets).Developed detailed engineering drawings using GD&T principles per ASME Y14.5, incorporating a strong understanding of quality inspection methods to accurately define and verify critical-to-function (CTF) and critical-to-quality (CTQ) features.Track record of cross-functional execution from concept to validated hardware (proto → pilot → production).Clear, concise communicator; self-directed; able to juggle multiple design workstreams.Ability to lift 50 lbs. unassistedExperience in battery, fuel cell, or power-generation system design.Demonstrated multiphysics experience (ANSYS, COMSOL, or equivalent) and test correlation.Scaling from prototype to production; cost and reliability ownership.Knowledge of electrolyte-compatible materials and corrosion mitigation.Experience with pressure-bound assemblies and pressure vessel considerations.Plastics and polymer component design for injection molding, extrusion, and plastics welding.Hands-on experience with CNC/CAM and other fabrication and machining techniques, with a solid understanding of tolerances, tool paths, and manufacturability trade-offs.Practical understanding of material creep, fatigue, and stress relaxation, including creep and fatigue failure analysis and life prediction for polymers and metals under sustained loads, vibration, and thermal cycling.Programming proficiency using engineering platforms such as Python or MATLAB for design automation, data analysis, or simulation post-processing.