Joseph S. Zeffiro
Full-Stack Software Engineer
Accomplished software engineer with 5+ years of experience in full-stack web development, delivering large-scale software systems and web applications within fast-paced environments.
About Me
- Extensive technical skillset, with a solid command of programming languages (C++, Java, Python, Rust), frameworks (React, Node.js/Express.js, ColdFusion), databases (SQL & NoSQL), and modern cloud services (AWS, Docker).
- System Design expert with a proven track record of designing scalable, efficient, and robust solutions involving microservices and layered architectures.
- Active role during each phase of the Software Development Life Cycle, designing innovative features, maintaining existing functionalities, and delivering clean and maintainable code to ensure technical excellence.
- Engaged collaborator, skilled at influencing and aligning multiple teams with conflicting priorities to drive progress under aggressive time constraints. Secret Security Clearance holder, able to handle sensitive information.
- Recreational programming includes, but is not limited to, contributing to open-source Java projects, building Next.js or React web pages, and developing Kotlin / Java or React Native-based Android apps.
Technical Skills
C#
C++
C
Java
Rust
Python
Golang
JavaScript
TypeScript
PHP
CFML
HTML/CSS
AngularJS
jQuery
Node.js
Express.js
React
ColdFusion
Next.js
JUnit
Mockito
.NET
Java Spring
Java Swing
OpenAPI
RabbitMQ
MySQL
SQL Server/MSSQL
Firebase
MongoDB
DynamoDB
Mlab
MongoCloud
Git
Android Studio
VS Code
SSMS
MongoDB Compass
Maven
Gradle
Jira
AWS
Docker
Containerization
Jenkins
Bitbucket
Github
Gitlab
Atlassian
TeamCity
SonarQube
Microservices
SaaS
Multithreading
Data Structures
Algorithms
Debugging
RESTful APIs
gRPC
tRPC
Protocol Buffers
WebSockets
Agile workflow
Scrum
Professional Experience
Software Engineer
Polaris Alpha | Parsons
Eatontown, NJ
May 2019 - Present
- Contributed to the technical effort by developing key functionalities for a large-scale software system, encompassing the conceptualization, design, and enhancement of innovative features as well as the maintenance of existing functionalities, delivering clean and scalable code in C++, Java, and C#.
- Developed a Kotlin-based ATAK Plugin adhering to U.S. Army specifications, integrating advanced geospatial capabilities to enhance battlefield situational awareness.
- Solely created a TAK interacting Webtak plugin using React as the primary builder. Made changes to and interacted with Java based TAKX plugins to serve a similar purpose.
- Thoughtfully identified functional & system requirements, researched adequate technologies and selected architectural & design patterns allowing for maximum scalability and performance.
- Designed and optimized system architecture for the DXTRS application, a 20+ year legacy system comprising Java, C++, and C#, now employing the strangler pattern to transition individual modules to Microservices. Focused on enhancing performance, scalability, and maintainability.
- Transformed legacy applications into Docker containerized gRPC-based microservices, with an end goal of distributing the strangled modules to Kubernetes.
- Streamlined data parsing and visualization primarily with Python, complemented by React and Next.js with TypeScript and JavaScript, achieving a large data processing throughput.
- Assisted in stimulating and testing GOV Adjacent applications such as Tak, ExCIS, AFATDS, CPCE, CPOF, and DDS by using JUnit as a harness for gRPC services, achieving a test coverage of over 78% for mission-critical systems.
- Led design reviews and system optimization initiatives, supported team members through knowledge sharing and mentorship, and promoted software engineering best practices to foster technical excellence.
Full-Stack Web Developer
Rde Systems Support Group
Little Falls, NJ
Feb 2019 - May 2019
- Contributed to the technical effort by developing a tutorial full stack web application, focusing on enhancing both user interfaces and server-side logic for the ECommerce system featuring item selection, carts, ordering.
- Supported the seamless development of a web application using Bootstrap, jQuery, and ColdFusion frameworks, featuring a clean, responsive, and easy-to-use interface, with a peak response time of under 342 ms.
Education
B.Sc. in Computer Science
New Jersey Institute of Technology
Newark, NJ
2017 - 2019
Associate Degree
Brookdale Community College
Middletown, NJ
2015 - 2017