Senior Microfluidic & Mechanical Design Engineer (POC Diagnostic Platform)

About Essenlix Corporation: Essenlix Corporation is a fast-growing medical device company focused on developing innovative point-of-care (POC) diagnostic platforms for decentralized clinical testing. Our technologies integrate microfluidics, precision instrumentation, and scalable manufacturing to enable accessible, high-quality diagnostics worldwide. Our overseas manufacturing facility in China is ISO 13485 certified. We are strengthening our U.S.-based development and quality systems while advancing next-generation diagnostic platforms from early-stage feasibility through commercialization. Position Summary We are seeking an experienced Senior Microfluidic & Mechanical Design Engineer to lead microfluidic cartridge development, sample handling system design, and mechanical integration for compact diagnostic instrumentation platforms. This role emphasizes microfluidic system design and sample handling mechanisms, followed by precision mechanical architecture and manufacturability in a regulated medical device environment. Key Responsibilities Microfluidic & Cartridge Development Design and optimize cartridge-based microfluidic systems. Develop and refine flow paths, reaction chambers, and optical interface regions. Address bubble control, sealing integrity, dead volume reduction, and fluid reliability. Support injection-molded microfluidic component design and tooling. Implement bonding processes such as ultrasonic welding and thermal sealing. Sample Handling & Fluid Management Design and optimize sample loading and metering mechanisms. Develop solutions for capillary flow, mixing, contamination control, and fluid stability. Validate robustness of sample handling under environmental variation. Ensure repeatability and manufacturability of sample interface systems. Mechanical System Design Lead structural design of compact diagnostic instruments. Perform tolerance stack-up analysis for precision alignment. Design mechanical interfaces between disposable cartridge and instrument. Develop thermal management structures supporting precision temperature control. Ensure mechanical durability under transport and field use conditions. Manufacturing & Compliance Support Support design-for-manufacturing (DFM) and production scale-up. Collaborate with overseas manufacturing teams on design transfer. Generate mechanical documentation within ISO 13485 design control framework. Participate in risk analysis and verification activities. Qualifications Required: Bachelor’s or Master’s degree in Mechanical Engineering, Biomedical Engineering, or related field. 5+ years experience in microfluidic device (Lab on a Disc preferred) or cartridge-based system development. Experience in sample handling and fluid management system design. Experience with injection-molded components and tooling. Strong understanding of sealing, bonding, and fluid path reliability. Proficiency in CAD (SolidWorks or equivalent). Experience in precision mechanical system design. Preferred Experience in IVD or diagnostic instrumentation. Experience in centrifuge-based microfluidics (centrifugal microfluidics / Lab-on-a-Disc), including sample metering, separation, washing, mixing, and reagent handling on disposable cartridges/discs; ability to translate assay workflows into robust fluidic sequences. Experience with ultrasonic welding or thermal bonding processes. Experience transferring products to manufacturing. Familiarity with ISO 13485 design control requirements. Experience working with cross-border manufacturing teams. Compensation & Benefits Competitive salary based on experience. 401(k) retirement plan. Health insurance. Paid time off. How to Apply Please submit your resume. #J-18808-Ljbffr