R&D Engineer — Medical Devices & Hardware

JASON
MESSNER

Based in Irvine, California - Relocating to NYC

3+ years taking a Class II medical device from prototype to market viable product through FDA 510(k) submission and preparation for commercial launch at a Y Combinator startup.

3+Years at Vena Vitals
4Device Iterations
510(k)FDA Submission
Y CombinatorBacked Company
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Jason Messner
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About Me

I am an R&D Engineer at Vena Vitals, a Y Combinator-backed startup developing a wearable, non-invasive continuous blood pressure monitor. The initial device launch targets critical care settings where arterial lines, the current gold standard for continuous blood pressure, are invasive, costly, and complex to set up. The Vena Vitals wearable offers advantages in patient safety, procedural cost, and ease of setup, with a longer-term vision to improve accessibility to continuous blood pressure for use in settings such as sleep clinics and home monitoring.

For 3+ years I have worked across nearly every stage of the medical device development lifecycle, from early prototyping all the way through FDA 510(k) submission and preparation for commercial launch of a Class II wearable device. My hands-on work spans rapid prototyping, mechanical design, sensor fabrication process R&D, FDA 510(k) submission, clinical testing site management, QMS development, and test method validation.

Mechanical Design Sensor Fabrication Process R&D SolidWorks CAD FDA 510(k) QMS / ISO 13485 V&V Clinical Testing Rapid Prototyping DFM GD&T
Experience
3+
Years in medical device R&D at an early-stage startup
Regulatory
510(k)
FDA submission support and design history documentation
Iterations
4
Full device design cycles from concept through production
Backing
Y Combinator
Proven in a resource-constrained, high-accountability environment
Work

Projects

Vena Vitals wearable blood pressure monitor on mannequin foot
Submitted for FDA 510(k) Review · Preparing Commercial Launch
01 / 04

Wearable Blood
Pressure Monitor

Mechanical Design Sensor & Electronic Integration FDA 510(k) Regulatory

In a team of 3, drove our primary wearable device through 4 design iterations, from prototype to market viable product alongside our FDA 510(k) submission. Each iteration further improved signal acquisition, anatomical versatility, ease of setup, and patient safety. The final design integrates the wearable, sensor, and PCB/power unit into one platform ready for commercial launch.

Scope of Work
  • Mechanical design and rapid prototyping across all 4 device iterations
  • Sensor integration and signal acquisition optimization
  • FDA 510(k) verification, validation, and regulatory documentation
  • Clinical study site management and data acquisition
  • Design for manufacturability (DFM) and injection-molding transition
V1 wearable prototype
V1
Signal acquisition established; inconsistent performance across anatomies, complex multi-component setup
V1 wearable prototype, full view
V2 wearable prototype
V2
Redesigned for usability and anatomical versatility: simplified setup, reliable across a wider range of subjects
V2 wearable prototype, full view
V3 wearable prototype
V3
Wearable, sensor, and PCB/power unit unified into a single device: eliminated complex multi-component setup
V3 wearable prototype, full view
V4 wearable final product
V4
Transition from prototype to market-viable product: industrial design, injection-molded parts, refined integration of components for commercial launch
V4 wearable final product, full view
02 / 04

Sensor Process R&D and
Manufacturing Setup

Sensor Fabrication Flexible Electronics Process R&D

Refined the fabrication process for the custom flexible sensor at the core of Vena Vitals' blood pressure measurement system. By revising work instructions and in-process QC criteria, I raised fabrication yield while protecting signal performance. A statistical risk analysis of the final QC acceptance criteria, incorporating intended use and patient harm risk, led me to revise those criteria and raise yield, setting the quality foundation for commercial production. I also helped build the ISO 13485-compliant QMS for in-house sensor manufacturing, covering process validation (IQ/OQ/PQ), risk management (PFMEA, risk controls), manufacturing traceability, and device master records.

Scope of Work
  • Fabrication process refinement, nearly doubling sensor yield
  • Work instruction and in-process QC criteria revision
  • Statistical risk analysis of final QC acceptance criteria, raising yield by a further factor of ~20%
  • ISO 13485 QMS development: process control, traceability, and device master records
  • Risk management and validation: PFMEA, IQ/OQ/PQ, and test method validation
Custom flexible sensor for wearable blood pressure monitor
Ongoing
Automated sensor QC test fixture, SolidWorks CAD model
In Development
03 / 04

Automated Sensor
QC Test Fixture

Mechanical Design Test Automation SolidWorks CAD Electrical Design V&V Quality Systems

Created a sensor QC step that did not exist before. Traced the root cause of a defect that appears in the sensor's signal output, then found a way to reproduce it without damaging or degrading the sensor. Wrote the QC protocol and developed the fixture that runs it: a slider-crank mechanism driven by a DC motor compresses the sensor at a defined frequency and records the resulting signal, reproducing the defect in an automated, repeatable way. Designed the mechanical hardware in SolidWorks, created and tested the electrical assembly, and programmed the microcontroller controls. Also defined the requirements for the evaluation software, set the acceptance criteria, and led test method validation for the QC step and all associated equipment and software.

Scope of Work
    • Established the QC step as a final functional check on every assembled sensor before shipment
    • Designed the fixture hardware in SolidWorks, combining custom-fabricated and off-the-shelf components
    • Defined the algorithm and software requirements, then handed them to the engineers who built the evaluation app and UI
    • Drafted and executed test method validation for the QC process and all associated equipment and software
04 / 04

Alternate Form Factors

Mechanical Design Rapid Prototyping Form Factor R&D Functional Testing Sensor and Electronic Integration

After the primary device reached a stable design, worked in a team of 3 to extend the platform into two working prototypes with new form factors. These were built primarily as proof of concept prototypes for investor presentations and industry conferences. Both were functional enough to collect real data, demonstrating that the sensor platform is adaptable to more than one part of the body. One moves the sensor to the wrist, the other to the hand, each with its own approach to functionality, comfort, and usability.

Scope of Work
  • Designed and prototyped two alternate form factors after the primary device
  • Selected materials and built functional units that collected real data
  • Demonstrated platform versatility at investor presentations and industry conferences
Wrist
Wrist form factor, palm-side view Wrist form factor, profile view
Hand
Hand form factor, back-of-hand view Hand form factor, thumb view
Capabilities

Technical Skills

Prototyping & Fabrication
FDM & SLA 3D Printing Laser Cutting / Engraving PCB Design Soldering & Electrical Assembly Industrial Sewing CNC Machining Keyence Digital Microscopy
Regulatory & Quality
ISO 13485 Risk Management (PFMEA) Risk Controls & Verification V&V (IQ/OQ/PQ) Test Method Validation QMS Development 21 CFR Part 801 Device Labeling IFU Development
CAD & Software
SolidWorks (CSWA Certified) AutoCAD MATLAB Microsoft Office (Excel, Word, PowerPoint)
Clinical Operations
Device Deployment & Management Clinical Data Acquisition Clinical Staff Training & Evaluation Data Quality Assessment
Academics

Education

University of California, Irvine
B.S. Mechanical Engineering  ·  2023  ·  GPA 3.325
Division I Student Athlete — Cross Country & Track and Field (2019–2023)
Documents

Resume

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Get In Touch

Let's Connect

Open to R&D and hardware engineering roles at startups and growth-stage companies in medical devices, robotics, and wearables.

jasonmessner1019@gmail.com