Sergio Hernandez

My Experience

California Science Center

Museum Technology Specialist

October 2025 - Present

Developed Google Apps Script (JavaScript) integrations to extend NocoDB functionality beyond native capabilities (scheduled automation and alerting), implementing Slack and email notifications for low-inventory thresholds and time-sensitive events.
Redesigned maintenance inspection workflows for 300+ exhibits by integrating walkthrough issue reporting into a centralized logging system, improving organization and visibility across 1,400+ incident records.
Supported exhibit technology operations by coordinating with vendors for parts and repairs, troubleshooting system and network issues, configuring automated computer power schedules, and implementing kiosk mode to restrict visitor access on Android devices ensuring proper up time of exhibits for over 700+ daily visitors.

Amazon

Software Development Engineer

December 2023 - Present

Developing and designing Object Oriented software to enhance the user interface for grocery product search results on amazon.com and other international domains that have grocery partners such as Whole Foods, Amazon Fresh, and Morrisons in marketplaces such as the US, India, Japan, the UK, and Spain to name a few.
Monitor experiments and projects that are visible to over 3.4 million customers to catch and triage any defects or bugs that are customer impacting, resulting in the successful launch of a new Add-To-Cart feature on Amazon Fresh and Whole Foods search that is live today.
Reviewed 50+ Java and JavaScript code submissions to ensure errors are caught in development and follows good coding standards, while also submitting over 60+ code reviews myself.
Developed an AWS CDK construct in TypeScript to generate customizable CloudWatch metrics for internal Amazon APIs, incorporating thresholds with alarms that cut tickets to our team when breached, and metrics like latency, availability, and CPU time, that get deployed across multiple AWS regions.
Managed the progress of over 45+ Jira stories, ensuring accurate tracking of experiments and projects to support team objectives.

PENNYMAC

Application Development Intern

June 2023 - August 2023

Developed an input processing program for the finance department that converts an English-like language into Python code, and had to take into consideration edge cases from pre-written statements.
Implemented a conversion algorithm from the Python code into JSON format for future execution, using CSV data to determine how to store each Python script.

California State University Northridge

Computational Research Assistant

June 2022 - January 2023

Perform GIS spatial analysis (in QGIS) and quantitative analysis (in Excel and Matlab)
Produced visualizations, including plot diagrams and images, to support earthquake research efforts

My Projects

Ka Chonk

React.js, Vite, TypeScript, Webpack, Javascript, Sass

Developed an online party game using JavaScript Websockets where users connect to the host session on their mobile phones and vote on the funniest responses to prompts. Designed UI mockups in Figma then implemented consistent styling throughout the frontend using Sass.

Project Management System

React.js, Node.js (Express), SQL, MySQL

React.js web-based application that manages employee assignments and tracks their progress by allowing users to add, view, update and delete employee records, and search by employee name, ID, position, or task. User data is stored in a MySQL database.

MAJESTiC Event Entertainment

React.js, Vite, TypeScript, EmailJS

Created a website for a multi-service company showcasing their products and services such as photobooth, dj, and photography, along with a contact form for clients to send inquiries to the company owner.

Advisement Login Portal

React.js, Firebase (user athentication)

Created a web application for my university's CADV advisement department that enables students to submit a form with their information such as their name, student ID, and reason for advisement. Only authorized admins can log in to the website and view the data.

Budgeting App

React (Web), React Native (Mobile)

Developed a cross platform budgeting application as part of a group in my senior design class. The app enables users to set a budget for the month and track their expenses by adding and deleting transactions. The app has a web and mobile version, and their data is stored in a database for future querying. I worked on the mobile UI and connecting the web version to the database.

Mp3 File Tagger

Python, PyQt5, Spotify API

Developed a python desktop application that leveraged the Spotify API to tag MP3 files with their release year and explicit content status, providing DJs with an efficient way to organize their music library.

Solar Escape

Unity, C#

Developed and designed a 2D endless runner video game featuring multiple levels, personal high score tracking functionality and is available as a Windows 64-bit installer.

My Achievements

CSUN FAANG Coding Club

President

Founded a club at my university to enhance interview and class performance by leading programming workshops and tutorials on computer science topics such as Binary Trees, Linked Lists, and Algorithms with the Java programming language.
Around 20 sophomore and junior university students participated in the club over the course of 1.5 years, which students have said filled a gap in learning for them.

2023 CSUN Code for a Cause Accessibility Competition

Winning Team

Led my group in developing a cross-platform React Native mobile application for tracking eye drop medication for post-surgery patients by organizing and prioritizing project requirements.
Contributed to the design and functionality of the app, resulting in a user-friendly prototype that won us the competition due to it being the most functional, judged by over 10+ software engineers in companies such as Northrop Grumman.
Gained git experience dealing with merge requests and merge conflicts, quickly learning within the 24 hour duration of the competition.

Hi, I'm Sergio

My Experience

My Projects

Ka Chonk

Project Management System

MAJESTiC Event Entertainment

Advisement Login Portal

Budgeting App

Mp3 File Tagger

Solar Escape

My Skills

My Education

My Achievements

Contact Me

Email

GitHub

LinkedIn