sean cha

LinkedIn Profile

Hi, I'm Sean

• mechanical engineer with software experience


• currently at Venhub making automated stores


• undergrad MechE degree from UCLA


• always looking to practice good engineering

resume

(click to view/download)

I am not a frontend dev. This is plain html+css. Please excuse any mistakes on this site. It was either this or a $25/month squarespace fee.

Experience

July 2024 - Present

  • Versatile software/mechatronics engineer materializing fully autonomous robotic stores, driving the company from pre-revenue stage to 3+ stores in the greater Los Angeles area


  • Developed store server software for communication and motion coordination (Python)


  • Programmed 6-DOF robotic arms for pick & place actions along with computer vision


  • Wrote firmware for microcontrollers (arduino, esp32 in C++) for controlling electro-mechanical systems


  • Played critical roles in setting up the first stores for public use


venhub front graphic venhub real use photo

Dec 2023 - Mar 2024

  • Carried out steerable-catheter handle designs from 3D printed and machined prototypes to injection molded parts, addressing multiple hand-assembly and design-for-manufacturability (DFM) issues


  • Created custom fixtures and procedures for testing and validating catheter components


  • Produced Solidworks assemblies, drawings with GD&T, and tolerance stackup analysis


nventric products

Oct 2022 - Jan 2023

  • Delegated to three project teams covering various industries


  • Designed structural part with FEA and hand calcs, meeting load deflection requirements


  • Manufactured composite and aluminum components with desktop CNC and manual mill


  • Performed iterative design with modal analysis for multi-axis vibration-test fixture


  • Helped maintain large Solidworks assemblies, make part drawings and documentation, and quote parts with third-party vendors


venhub real use photo

Projects

Firefighting Robot

firefighting robot

A fire extinguishing robot for my UCLA capstone group project, using a Raspberry Pi 5 controlled via wifi, Arduino Uno, BLDC drone motors, and B-G431B-ESC1 drivers.

Challenged myself by taking care of things previously unfamiliar to me--electronics hardware and software, which includes all of the programming, motors, sensors, custom li-ion battery pack, powering everything, etc.

BAJA Suspension Design

firefighting robot

Independently developed a Simulink tool to analyze the kinematics and dynamics of our suspension system

Allowed us to decrease full-travel (unwanted) bump steer by 78%, more precisely characterize camber change, steering angles, and joint misalignment angles, and optimize suspension for user-specified goals at the press of a button

Robotic Arms

firefighting robot

[Top] arm 1: 4-DOF Robotic Camera Arm for UCLA Robotics Lab “RoMeLa“. Custom thrust+ball bearing base with Dynamixel servo motors

[Bottom] arm 2: 4-DOF Drawing Robot using MATLAB with hand-calculated inverse kinematics formulas (I did not do the CAD for this...it's not pretty)