Top Mechanical Design Engineer Jobs in Seattle, WA

Owns end-to-end design of new battery packs from concept through production. Responsibilities include optimizing performance, size, weight, manufacturability, and reliability; leading prototyping, testing, qualification, production handoff, requirements definition, drawings, failure analysis, cross-functional architecture execution, design reviews, mentorship, and program leadership.

Leads mechanical product design and development from concept through production release. Resolves complex design and manufacturing challenges, develops production capabilities and quality protocols, oversees testing and corrective actions, and guides engineers and technicians. Manages project timelines and supports cost reduction and process improvement initiatives for waterworks products.

Develop thermal-hydraulic models for scientific apparatus using ASME B31.3-2022 for installation at a research reactor. Perform steady-state and transient temperature modeling, work independently, and coordinate with EPC contractors and vendors on costs and budgets. The role is remote, part-time, and temporary, with at least four required site visits to State College, Pennsylvania. U.S. citizenship, background screening, drug-free status, and references are required.

Designs mechanical and electromechanical test fixtures, tooling, and related hardware for optical networking products. Responsibilities include CAD modeling, engineering drawings, BOMs, configuration-controlled documentation, engineering analysis, tolerance studies, fabrication support, assembly, troubleshooting, validation, and deployment. The role collaborates with engineers, technicians, suppliers, and manufacturing partners to deliver reliable, manufacturable solutions throughout the product development lifecycle.

Lead the architecture, hydraulic design, documentation, integration, manufacturing readiness, controls coordination, and commissioning of liquid-cooling and mechanical distribution systems for modular AI data centers. Own P&IDs, calculations, equipment and valve schedules, interfaces, standards, and performance validation. Collaborate with thermal, electrical, controls, manufacturing, commissioning, supply chain, OEM, and field teams to create scalable, serviceable, repeatable systems for deployment across multiple sites.

Designs and develops fluid and mechanical subsystems for rocket-engine ground test facilities. Responsibilities include propellant delivery systems, cryogenic and vacuum systems, hazardous-propellant procedures, structural and fluid analysis, component selection, build reviews, commissioning, supplier coordination, hazard analysis, and mentoring junior engineers.

Design and own rocket engine TCA hardware through requirements, analysis, manufacturing, testing, and flight qualification. Responsibilities include mechanical design, FEA, tolerance analysis, tooling and fixture design, advanced manufacturing process development, hotfire test execution, documentation, and rapid redesign. The engineer works closely with propulsion, manufacturing, machinists, welders, technicians, and test teams in an onsite shop and laboratory environment.

Lead battery system architecture, design, qualification, integration, and production for X-BAT, launch/recovery vehicles, and ground equipment. Deploy high-voltage, high-power battery systems, build team and lab, perform verification, debug complex electrical and environmental issues, and provide mentorship and program leadership.

Lead architecture, design, and development of precision wire harnesses and cable assemblies for autonomous UAVs. Own 3D CAD routing, analysis, prototypes, and testing. Perform electrical and environmental reliability analysis, integrate with avionics/systems/manufacturing, and mentor engineers to establish harness design best practices.

Lead mechanical design of rugged, deployable Ground Support Equipment (GSE) for next-generation UAS. Create CAD models and drawings, perform structural/thermal/fatigue analyses, run trade studies, oversee prototyping and testing, develop technical documentation, collaborate with manufacturing/suppliers, and support flight test campaigns to meet military and aviation standards.

Designs and develops pharmaceutical drug-delivery devices and platforms using CAD, prototyping, testing, tolerance analysis, and Design for Manufacturing principles. Collaborates with internal teams, external consultants, CROs, and manufacturing partners to troubleshoot products, support design controls, build intellectual property, and transfer devices into production. Manages project budgets and timelines while serving as a technical resource for cross-functional teams.

Lead end-to-end mechanical design and manufacturing for TCA rocket engine components. Drive DFM-focused design, tooling and fixture creation, implement advanced fabrication (additive, CNC, EDM, specialized joining), develop process parameters, and plan/execute hotfire test campaigns with analysis and rapid redesign for flight qualification.

Design and develop mechanisms for satellite production, owning projects from concept to completion, while partnering with flight design and managing multiple tasks in a fast-paced environment.

Lead mechanical system and structural hardware design from concept to production. Create 3D models, drawings, BOMs, and manufacturing documentation. Perform analyses, tolerance studies, and support prototyping, testing, and production transition while mentoring junior engineers and ensuring compliance with aerospace standards.

Collaborate on mechanical designs for data center systems, validating performance, overseeing construction, and ensuring designs meet quality benchmarks.

Lead mechanical engineering evaluations for data center opportunities, assessing HVAC, cooling, chiller, CRAH/CRAC, liquid cooling, and critical equipment systems. Conduct facility due diligence, validate capacity and design assumptions, evaluate vendors and deployment risks, and provide feasibility and Go/No-Go recommendations. Support mechanical design strategies, equipment selection, commissioning, and construction readiness while partnering with engineering teams, consultants, and vendors to establish scalable standards for hyperscale and AI infrastructure.