Denorro Stallworth, Developer in Birmingham, AL, United States
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Denorro Stallworth

Verified Expert  in Engineering

Mobile Apps Developer

Location
Birmingham, AL, United States
Toptal Member Since
June 29, 2020

Denorro is a full-stack developer with seven years of experience. In addition to working in the insurance, energy, and defense industries, he enjoyed being the tech lead for a startup. As a full-stack developer, Denorro has built and implemented numerous single-page applications and mobile apps, using Java, Spring, Angular, React, React Native, AWS, SQL, and Git.

JavaFull-stackSQLCSSjQueryReactAgileGitREST APIsPostgreSQLReduxFirebaseTypeScriptAmazon S3 (AWS S3)Spring

Portfolio

Viva Health
React Native, JavaScript, React, Amazon Web Services (AWS), Amazon Cognito
Array Information Technology
Git, Jenkins, React Native, React, jQuery, JavaScript, SQL, Hibernate, MyBatis...
Maze Services
Amazon Web Services (AWS), SQL, React Native, Google Cloud, Spring, Java...

Experience

Mobile Apps - 9 yearsJavaScript - 9 yearsSQL - 9 yearsJava - 9 yearsReact - 6 yearsReact Native - 5 yearsREST APIs - 5 years

Availability

Part-time

Preferred Environment

Amazon Web Services (AWS), Android Studio, Xcode, DataGrip, IntelliJ, WebStorm, MacOS, Azure

The most amazing...

...mobile app I've developed was MAZE. It was built for a US-based startup and allowed users to book mobile cosmetic services.

Work Experience

Mobile Developer

2020 - PRESENT
Viva Health
  • Developed an application for Viva Health's customers to access benefits, medical claims, and prescription claims.
  • Implemented Amazon Cognito into the mobile app to be used as the authentication system.
  • Oversaw deployment of the mobile app to the App Store and Google Play.
Technologies: React Native, JavaScript, React, Amazon Web Services (AWS), Amazon Cognito

Software Developer

2018 - PRESENT
Array Information Technology
  • Fixed the production issues listed in Jira and collaborated with the client's field testers to solve issues.
  • Implemented new features in both the web application and the mobile app.
  • Optimized SQL queries that would gather large amounts of data used in daily, monthly, and quarterly reports.
  • Converted a front end from Java Server Pages to React.
Technologies: Git, Jenkins, React Native, React, jQuery, JavaScript, SQL, Hibernate, MyBatis, Spring, Java

Development Team Lead

2018 - 2019
Maze Services
  • Built an MVP application for a beauty startup company, using React Native for iOS and Android mobile platforms.
  • Implemented a REST API, using the Spring Framework to provide back-end services to a mobile app built in React Native and a web application.
  • Used AWS RDS (MySQL and PostgreSQL) to host a database and store application data as well as various file types, such as images and text files, using AWS S3.
Technologies: Amazon Web Services (AWS), SQL, React Native, Google Cloud, Spring, Java, REST APIs, MySQL, PostgreSQL, Amazon S3 (AWS S3)

Application Developer

2016 - 2018
Southern Company
  • Developed an admin-facing web app that kicked off daily batch jobs that would send reports to an email list.
  • Tracked and fixed bugs using Jira as a reporting tool.
  • Visited nuclear power plants to meet with the shadow users of the applications I maintained to gain insights on new features we could implement to make their jobs easier.
Technologies: Amazon Web Services (AWS), Node.js, SQL, C#, .NET, Spring, Java

Software Developer

2016 - 2016
Standfield Systems
  • Implemented a single-page application using a REST API built in Java, Spring, Hibernate, and Angular on the front end.
  • Used Mercurial for version control, Jenkins for continuous integration, and Junit and Mockito for testing.
  • Tracked issues using Jira and documented resolutions using Confluence.
  • Mentored other developers who weren't familiar with Angular.
Technologies: Jenkins, SQL, JPA, Hibernate, Spring, Java, REST APIs

Application Developer

2013 - 2016
Kemper (Infinity Insurance)
  • Developed applications that ran daily to generate numerous files to be sent to internal and third parties.
  • Built the front end and back end of web applications using Java, JSP, JDBC, and servlets.
  • Developed applications using TIBCO BusinessWorks to automate processes that needed to be done daily to decrease the daily manual workload.
  • Maintained C++ and VB6 legacy applications used to handle processes that dealt with printing forms and sending data.
Technologies: TIBCO, Jenkins, jQuery, JavaScript, Visual Basic, C++, Spring, Java

Mobile Beauty App (MAZE)

I led the development team to implement a mobile app using React Native along with other technologies and libraries. I designed the system to optimize how all the services would work together. The UX team provided sketches, images, and fonts to incorporate into the UI, which I implemented along with certain events that would interact with back-end RESTful Services.

Production Data to Test a Transfer Application

This Java web application allowed the QA department to copy data from production to testing. QA would first search for records that fit a certain criterion and get the policy number of those records. Using that policy number, the data would be queried and the data pertaining to that policy number would be copied from the production database tables onto the test database tables. The front end was implemented using HTML5, CSS, JavaScript, and JSP. The back end was implemented using Servlet, JDBC, and PL/SQL with an Oracle database.

Viva Health | Viva Medicare

https://www.vivahealth.com/
A mobile application built with React Native, allowing Viva's customers to access their health benefits, medical claim history, and prescription claim history. I implemented Amazon Cognito into the application to be used as the authentication system. The app was deployed in the App Store and Google Play.

Languages

Java, SQL, JavaScript, TypeScript, HTML, CSS, C#, C++, Visual Basic, HTML5

Frameworks

React Native, Redux, Spring, Hibernate, .NET, JPA, Jakarta Server Pages (JSP)

Libraries/APIs

React, jQuery, REST APIs, MyBatis, Node.js, JDBC

Tools

Git, WebStorm, IntelliJ, DataGrip, Xcode, Android Studio, Jenkins, Servlet, Amazon Cognito

Paradigms

Agile

Platforms

Firebase, MacOS, Amazon Web Services (AWS), iOS, Android, Oracle Database, Azure

Storage

PostgreSQL, Amazon S3 (AWS S3), Google Cloud, PL/SQL, MySQL

Other

Software Development, Mobile Apps, Web Applications, Full-stack, TIBCO, RESTful Services

2006 - 2013

Bachelor's Degree in Electrical Engineering

University of Alabama at Birmingham - Birmingham, Alabama