Sen Cai

Queens

Summary

Full-Stack Software Engineer with 4+ years of experience designing and delivering real-time, customer-facing web applications. Strong focus on JavaScript, TypeScript, modern UI frameworks, and REST APIs. Proven ability to translate live system data into accurate, performant, and accessible user interfaces in high-availability production
environments.

Overview

years of professional experience

Work History

Full-Stack Software Engineer

NJ Transit

Newark, NJ

01.2020 - Current

Designed, developed, and maintained frontend features and real-time REST APIs delivering accurate train and light rail schedules to public-facing digital signage.
Led the redesign of Newark Light Rail signage UI using Vue.js and TypeScript, improving accessibility, responsiveness, and long-term maintainability.
Built performant UI components that transformed live operational data into clear, user-focused arrival and service information.
Improved system reliability and performance through validation, error handling, refactoring, and API optimization.
Collaborated closely with product managers, designers, operations teams, and vendors to deliver intuitive, user-focused experiences.
Debugged production issues across the full stack, identified root causes, and drove permanent fixes.

Software Engineer

Solaricorp

Queens, NY

01.2018 - 01.2020

Designed and built a Staten Island Railroad (SIRR) public address (PA) announcement system from scratch, developing a Java-based backend service and a Vue.js frontend interface to manage real-time station announcements.
Built the first-generation digital signage UI for MBTA stations in Boston by integrating with MBTA public data APIs to display real-time arrival and service information for customers.
Created a vendor inventory management application to track equipment usage, utilities, and inventory items and identify when new items needed to be ordered.
Implemented backend services and data models to support inventory tracking and vendor accountability.
Maintained and enhanced production systems including MTA subway signage platforms and railroad communication systems.

Education

Bachelor of Science - Computer Science

St. John's University

Queens, NY

05-2019

Skills

Frontend: JavaScript, VueJS, TypeScript, HTML, CSS
Backend: NodeJS, TypeScript, JAVA
Database: MySQL, MongoDB, Oracle SQL, Postgres
API design and integration

Responsive web design
Object-oriented programming
Full-stack development
User interface design

Websites

Timeline