Jeff Marin, Developer in Lake Mary, FL, United States
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Jeff Marin

Verified Expert  in Engineering

Software Developer

Lake Mary, FL, United States
Toptal Member Since
August 21, 2014

With 30+ years working as an engineer, project manager, and director, Jeff is able to combine exceptional communication skills with superior technical abilities. While working in the high-tech, financial, entertainment, manufacturing, and medical industries, he has built a large store of knowledge.


TypeScript, React
BioReference Laboratories
Jersey, Apache Tomcat, MySQL, Ace Editor, GoJS, Ext JS, Jakarta EE, JBoss Drools
Always Near TeleHealth
C#, Google Cloud Platform (GCP), Firebase, Angular




Preferred Environment

Git, Visual Studio, Eclipse

The most amazing...

...thing I've built is the iRise Importer. It works by injecting introspective JavaScript into any existing webpage through an embedded browser.

Work Experience

Senior Full-stack Developer

2022 - 2023
  • Worked with a front end written in React/TypeScript and a microservices back end where REST services and REST workers were written in TypeScript and PostgreSQL.
  • Built Teneo MDM, a mobile device management platform currently supporting iOS and Android devices.
  • Created this app so users can control all aspects of company devices, including applications and their managed configurations, stolen mode, lost mode, passwords, and view device history and locations.
Technologies: TypeScript, React

Chief Architect

2015 - 2023
BioReference Laboratories
  • Worked with a genetic counselor to implement family history-based rules within the Drools rules engine using Java. Rules include health insurance coverage.
  • Created a JSON web service to accept family tree information and output rules that, when triggered, recommended genetic tests and health insurance coverage.
  • Created a front-end application to allow genetic counselors to create, test, and modify rules. The application includes a pedigree chart using GoJS and a rules editor using Ace.
Technologies: Jersey, Apache Tomcat, MySQL, Ace Editor, GoJS, Ext JS, Jakarta EE, JBoss Drools

CTO | Full-stack Developer

2022 - 2022
Always Near TeleHealth
  • Worked with web applications and a Raspberry Pi C# controller built with Angular, Ionic, Google Cloud Functions, Firebase, Google Cloud IoT, Rasberry Pi, C#/.Net, and MQTT protocol.
  • Performed this using IoT sensors monitoring for safety conditions, especially falls. Additionally, daily activities are recorded for preventive health solutions.
  • Worked on this solution that allows senior citizens to live in place.
Technologies: C#, Google Cloud Platform (GCP), Firebase, Angular

CTO | Full-stack Developer

2021 - 2021
  • Set technical direction and full stack developer on a website that uses Artificial Intelligence to generate human-like text.
  • Worked with technologies such as React, TypeScript, OpenAI, and MySQL.
  • Allowed the saving of searches and allowed re-rendering of lists.
Technologies: TypeScript, React, OpenAI, MySQL

Tech Lead | Full-stack Developer

2021 - 2021
  • Created architectural solutions, mentored junior developers, interviewed potential BAs and developers, and implemented full-stack solutions.
  • Worked with AWS, Dojo, TypeScript, TypeORM, and MariaDB technologies.
  • Collaborated with these projects that were included in the Jail Management System and Reconnect, a platform to transition incarcerated individuals back into society.
Technologies: TypeScript, Node.js, Dojo

Senior Node.js Developer

2020 - 2021
Driven By Safety
  • Debugged existing Python scripts running in Google App Engine and wrote new Python scripts to automate data handling.
  • Debugged and extended existing Node.js/Angular applications using JavaScript.
  • Worked with AWS, Digital Ocean, SashiDo, and MongoDB.
Technologies: MongoDB, Amazon Web Services (AWS), Angular, JavaScript, Python 2

Full-stack React Developer

2020 - 2020
RV For Fun
  • Performed front-end development including Next.js, TypeScript, custom React components, CSS, GraphQL calls, and Ant Design components.
  • Performed back-end development, including Nest.js, TypeScript, TypeORM, DB design, GraphQL components, and authorization.
  • Created Nest.js entities, models, resolvers, and services.
Technologies: React, GraphQL, PostgreSQL, Antd, Next.js, NestJS, TypeScript


2020 - 2020
  • Created Java/Spring Boot middleware with a REST interface.
  • Contributed to the development of React front-end code.
  • Serialized and deserialized code using Apache AVRO.
  • Communicated with the back end using Unix Sockets.
Technologies: React, Java, Spring Boot

Back-end Developer

2019 - 2019
Virtual Real Estate
  • Supplied back-end API methods for front-end developers using Node.js.
  • Worked with MySQL and MLS data.
  • Worked with AWS S3 for image handling.
  • Researched data vendors and selected best fit.
  • Created AWS RDS for the project.
Technologies: Data, RETS, Amazon S3 (AWS S3), Amazon EC2, MySQL, Node.js

Chief Architect for Platform Engineering

2018 - 2018
  • Created direction and documentation for a serverless architecture that complied with 12-factor app mandates, microservices included.
  • Implemented and deployed Spring ConfigServer and other Spring Cloud Technologies.
  • Modified existing and created new pipelines in Concourse CI.
  • Used Docker and Docker Compose to create ELK stack for data analysts.
Technologies: Java, Spring Boot, Concourse CI, Docker Compose, Docker, Microservices

Chief Architect

2016 - 2017
  • Using Node.js, designed and implemented Insights, a warehousing engine to provide teachers, admins, and parents advanced analytics.
  • Created microservices for front-end developers.
  • Created extremely complex ad-hoc MySQL queries to control ordering and record selection.
  • Created and ingested AWS SQS messages.
Technologies: Amazon Web Services (AWS), Analytics, Microservices, Data Warehousing, Data Warehouse Design, ECMAScript (ES6), MySQL, Node.js

Chief Architect

2015 - 2015
  • Created dozens of web crawlers utilizing Node.js and AWS Lambda. Implemented the web crawlers to parse APIs and raw HTML results.
  • Created a Chrome extension to query LinkedIn via Google (XRay Search) and create candidates for potential inclusion within the end-user ToutApp sales campaign.
  • Worked with a 500 node proxy server pool to parallel process LinkedIn XRay results.
  • Created a front-end application in Node.js and Express.js to monitor web crawler status.
  • Utilized the Node.js CRON library to schedule daily and weekly web crawlers.
  • Stored the results of the scraped information in MongoDB.
Technologies: MongoDB, AWS Lambda, Node.js

Senior Architect

2014 - 2015
veEDIS Clinical Systems (via Toptal)
  • Converted home-grown rules-based architecture to Drools standards.
  • Converted rules (over 500) to the Drools Rules Language.
  • Added state-of-the-art subject matter expert rules editing tools.
  • Created custom accumulators for medical scoring rules and added the ability to perform longitudinal medical rules.
  • Added mapping to SNOMED, RxNorm, and other medical standards.
Technologies: Jersey, Ext JS, Jakarta EE, JBoss Drools


2014 - 2014
Amazon Web Services
  • Created a Windows client to communicate with Amazon AppStream server applications. The client included customized captions using windows non-client messaging.
  • Customized DirectX implementation to display low network levels.
  • Worked on an AppStream Android client. The solution included JNI/NDK interface with AWS DLLs and GLSurfaceView implementation.
  • Created a customized AppStream eligibility server. Both clients communicated with the eligibility server for authorization and available AppStream applications. Both clients monitored network latency, download speed, dropped frames, and displayed warnings when stats were below minimum acceptable levels. Both clients submitted survey results to Kinesis service.
Technologies: Amazon Web Services (AWS), Jetty, Visual Studio, Eclipse, Android NDK, Accessory Development Kit (ADK), Android, C++, Amazon AppStream, JNI, Java

Director of Accelerator Products

2008 - 2014
  • Designed, implemented, tested, and maintained a suite of products to complement iRise core products.
  • Created iRise CodeGen, which creates software code from iRise simulations, reducing customer efforts to create code by up to 70%.
  • Created iRise Importer, which converts existing web pages to iRise simulations, reducing customer efforts by up to 90%.
  • Worked on project management, technical architecture, and application development.
  • Worked on iRise Adoption Center and connectivity products to requirement management systems, including HP Quality Center and Borland Caliber.
Technologies: Agile, Jira, Apache Maven, JxBrowser, JavaScript, MySQL, Apache Tomcat, Jakarta Server Pages (JSP), Java SE

Project Manager/Enterprise Architect

2007 - 2008
  • Created Synapse, a rule-based web application to determine insurance reimbursement eligibility in real time. Synapse allowed medical, non-technical personnel to enter complicated medical eligibility rules through a simple-to-use web interface.
  • Provided project management, technical design, and application development services.
Technologies: Ajax, JavaScript, Telerik, Microsoft SQL Server, VB.NET, C#.NET, BizTalk Server 2009

Project Manager/Senior Software Architect

2006 - 2007
  • Worked on new front- and back-end architecture to increase revenue from Norton customers.
  • Provided project management, technical design, and application development services.
  • Worked on Norton presentation layer and website storefront back-end code.
Technologies: Hibernate, Enterprise Java Beans (EJB), Java, IBM WebSphere

Senior Software Architect/Technical Liaison

2006 - 2006
  • Assisted Yahoo Search Marketing in rolling out Panama SDK to their multi-million dollar Yahoo accounts.
  • Traveled through the US, visiting key customers and helping them with software implementation and deployment issues.
  • Prepared Yahoo/Google Internet Ad implementation comparison read by Jerry Yang, CEO.
Technologies: .NET, Jakarta EE, Web Services

Senior Software Architect

2005 - 2006
  • Worked on application development for Sony CONNECT Music Store, using Sony's digital rights management system.
  • Performed batch processing to convert music from various sources and formats.
Technologies: Digital Rights Management (DRM), Java

Project Manager/Architect

2004 - 2005
Axium Entertainment Payroll Services
  • Worked on a production accounting system, which has been live, with over a billion dollars of activity.
  • Managed a system consisting of more than 500 thousand lines of Java code, dozens of stored procedures in MS SQL servers, and dozens of reports running on Crystal Enterprise.
Technologies: Crystal, Citrix, Microsoft SQL Server, Java

Project Manager/Architect

2003 - 2004
  • Worked on the warranty claim review system, certified user car program, and WebSphere portal, where users perform delegated user administration tasks.
Technologies: Jakarta EE, Jakarta Server Pages (JSP), Apache Struts, WebSphere Application Server

Director of Technical Education/Architect

2001 - 2003
Gamma Enterprise Technologies
  • Created and delivered J2EE-centric courses.
  • Architected and implemented Gamma's Java to SAP enterprise connectivity.
  • Presented at computer conferences on technology, and co-authored "WebLogic Server 8.1 Unleashed."
Technologies: Java

Project Manager/Architect

2000 - 2001
  • Created HomePage builder, an advanced applet to allow non-programmers to create web pages using WYSIWIG.
Technologies: Java

Project Manager/Architect

2000 - 2000
Seren Systems
  • Created advanced ATM machines with scanning capabilities.
Technologies: Java

Director of Strategic Development

1999 - 2000
  • Worked on online auction front- and back-end code.
Technologies: Microsoft SQL Server, Adobe ColdFusion

Project Manager/Architect

1996 - 1999
Eagle Creek Systems
  • Created TexCAD, a CAD system used in creating fabrics for the textile industry.
Technologies: OpenGL, C++, Microsoft Foundation Class (MFC) Library, Microsoft Foundation Classes (MFC)

Senior Systems Analyst

1994 - 1995
Salomon Brothers
  • Worked on applications to support internal financial planning/budgeting.
Technologies: C++, Microsoft Foundation Class (MFC) Library, Microsoft Foundation Classes (MFC), IBM Informix

Systems Analyst

1993 - 1994
Merrill Lynch
  • Worked on applications to help brokers with their day-to-day operations.
Technologies: Visual Basic, C++, Microsoft Foundation Class (MFC) Library, Microsoft Foundation Classes (MFC)

Programmer Analyst

1987 - 1992
Gruntal, Inc.
  • Created reports for equity clearance services.
Technologies: PL/1

iRise Web Importer

I developed an iRise Studio plugin that injects introspective JavaScript into any existing web page, to ascertain its contents, and then recreates them in iRise studio.

iRise CodeGen

iRise CodeGen creates software code from iRise simulations, and can reduce customer efforts to create code by up to 70%.

Production Accounting System

Accounting System for the Entertainment industry, consisting of over 500K lines of Java code.
1990 - 1992

Coursework in Artificial Intelligence/Natural Language Processing

New York University - New York City

1983 - 1987

Bachelor of Science Degree in Computer Science

State University of New York - Stony Brook, NY


Professional Project Manager

Project Management Institute


BEA WebLogic Server Developer and Administrator



Novell Certified Network Engineer



jQuery, Node.js, NinjaScript, React, Google API, YUI, jQuery UI, JxBrowser, Microsoft Foundation Class (MFC) Library, OpenGL, GoJS, Antd, Microsoft Foundation Classes (MFC)


Ace Editor, Eclipse IDE, Docker Compose, Concourse CI, JBoss Drools, Apache JMeter, Apache Maven, Microsoft Visual Studio, Jira, Apache Tomcat, Adobe ColdFusion, Amazon AppStream, Accessory Development Kit (ADK), Android NDK, Visual Studio, Jetty, Git


SQL, HTML, Java, JavaScript, ECMAScript (ES6), CSS, XML, C++, C, C#, Java SE, Crystal, Visual Basic, C#.NET, VB.NET, PL/1, Python 2, TypeScript, GraphQL


REST, Agile Software Development, Object-oriented Programming (OOP), Microservices, Asynchronous Programming, Distributed Programming, Service-oriented Architecture (SOA), Agile


Ubuntu, Windows, Docker, Amazon Web Services (AWS), Heroku, Java EE, IBM WebSphere, Jakarta EE, Citrix, Eclipse, Telerik, AWS Lambda, Amazon EC2, Android, Google Cloud Platform (GCP), Firebase

Industry Expertise

Project Management


Spring, Ext JS, Grinder, JUnit, Hibernate, Jersey, Jakarta Server Pages (JSP), .NET, Apache Struts, JNI, Spring Boot, Angular, NestJS, Next.js, Bootstrap, TestNG, Dojo


JSON, MongoDB, Microsoft SQL Server, MySQL, IBM Informix, Amazon S3 (AWS S3), PostgreSQL


Scraping, Multithreading, Offshore Development, Software Engineering, Front-end Development, WebLogic, Data Mining, Chrome Extensions, GlassFish, Web Services, Digital Rights Management (DRM), WebSphere Application Server, BizTalk Server 2009, Ajax, Data Warehousing, Analytics, RETS, Data, Data Warehouse Design, Enterprise Java Beans (EJB), OpenAI

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