# Cristian Constantin

> R&D Mechanical Engineer III @ Rani Therapeutics | 
Mechanical Engineering MSE & BSE from University of Pennsylvania

Location: San Jose, California, United States
Profile: https://flows.cv/cristianconstantin

R&D Mechanical Engineer with expertise in designing, prototyping, and analyzing innovative medical devices and consumer electronics, from concept through mass production. Cross-functional collaborator (production, process, quality, automation teams) delivering solutions that balance reliability, functionality, and manufacturability. Passionate about leveraging emerging technologies and advanced materials to develop impactful, high-performance solutions exceeding market and user expectations.

## Work Experience
### R&D Mechanical Engineer III @ Rani Therapeutics
Jan 2021 – Present | San Jose, California, United States
•Enhanced Class III medical device performance, reliability, manufacturability and sterilization properties of an orally ingestible drug delivery combination device, contributing to 95% preclinical/clinical success and 50X increased drug payload
•Led multiple New Product Development (NPD) projects through design and rapid prototyping (idea to CAD, tooling, CNC, molding, IQC within 24 hours) of thin-walled thermoplastics, silicone, and butyl rubber components for complex, compact medical device assemblies (actuators, valves, bladders), meeting tight deadlines. Leveraged precision GD&T and tolerance stack-up to achieve sub-0.001” tolerances, optimizing fit, biocompatibility, manufacturability and tripling shelf life
•Designed and built test fixtures, semi-automated manufacturing equipment and associated protocols across a wide range of device components, programmed robots for 0.001” precision assembly, developing and characterizing joining processes (2D/3D heat staking, adhesive application), directly contributing to successful V&V completion
•Drove production improvements, boosting throughput by over 5X through part redesign collaborating with automation, and cutting defect rates by over 90% via root cause analysis (e.g., bonding failures, cracks) and corrective actions
•Authored comprehensive FDA-compliant documentation (Verification & Validation, Product Spec, DFMEA, IQ/OQ/PQ, MPI, SOP, WI, URS, engineering drawings) ensuring regulatory compliance and smooth team handoffs

### Product Development & Partnership Lead @ IceGlaze
Jan 2024 – Jan 2025 | San Jose, California, United States
•Contributed to electromechanical integration and refinement of liquid crystal smart tint for aftermarket automotive panels
•Operated on a founder-level exploratory capacity: supported product validation, market analysis, logistics, and regulatory compliance, culminating in a successful SEMA presentation, positive market perception, and partnership discussions

### Smart Eyewear Design Consultant @ Chamelo
Jan 2023 – Jan 2024 | Shenzhen, Guangdong, China
🏆 Time Magazine’s Best Inventions 2024
•Collaborated with teams in Japan and China to design award-winning smart glasses with electronically controlled tint
•Provided DFM input supporting mass production and validation of precision-molded frames using FEA and GD&T to optimize rigidity, snap-fits, and tolerance stack-up for precise PCB, speaker, and FPC alignment, in collaboration with the EE team
•Advised iterative design to address critical EVT/DVT failure modes (drop, thermal cycle, vibration),resulting in 0% failure rate


## Education
### Master of Science in Engineering in Mechanical Engineering and Applied Mechanics, Design and Manufacturing concentration
University of Pennsylvania

### Bachelor of Science in Engineering in Mechanical Engineering and Applied Mechanics
University of Pennsylvania


## Contact & Social
- LinkedIn: https://linkedin.com/in/1-cristian
- Portfolio: https://portfolium.com/entry/constantin-cristian-portfolio-2020-dec
- Portfolio: https://pennathletics.com/sports/mens-track-and-field/roster/cristian-constantin/14872

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Source: https://flows.cv/cristianconstantin
JSON Resume: https://flows.cv/cristianconstantin/resume.json
Last updated: 2026-04-13