Denorro is available for hire
Hire DenorroDenorro Stallworth
Verified Expert in Engineering
Mobile Apps Developer
Location
Birmingham, AL, United States
Toptal Member Since
June 29, 2020
Denorro is a software engineer with over 10 years of experience, including full-stack and mobile development. He's worked in the insurance, medicare, defense, energy, logistics, and retail industries. He's also been an integral piece in the design and architecture of applications and the database structure. Denorro has worked with technologies such as Java, Spring, React, React Native, SQL, Google Cloud, AWS, Azure, etc.
Portfolio
Walmart
React, Redux, React Native, CI/CD Pipelines, Git, RESTful Services, SQL...
Viva Health
React Native, JavaScript, React, Amazon Web Services (AWS), Amazon Cognito...
J.B. Hunt Transport
Spring Boot, React Native, Azure, Firebase, Git, CI/CD Pipelines...
Experience
Availability
Part-time
Preferred Environment
Amazon Web Services (AWS), Android Studio, Xcode, DataGrip, IntelliJ IDEA, 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
Software Engineer
2022 - 2023
Walmart
- Contributed to multiple web and mobile applications for internal use by employees using React, React Native, and a host of other technologies.
- Maintained applications, fixed bugs, and kept an 85% code coverage.
- Input the design and architecture of multiple applications related to state management and database structure.
Technologies: React, Redux, React Native, CI/CD Pipelines, Git, RESTful Services, SQL, JavaScript, Mobile Development, iOS, APIs
Mobile Developer
2020 - 2022
Viva Health
- Developed an application for Viva Health's customers to access benefits, medical, 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.
- Maintained and implemented new features of REST APIs.
Technologies: React Native, JavaScript, React, Amazon Web Services (AWS), Amazon Cognito, Mobile, Spring Boot, SQL, RESTful Services, Mobile Development, iOS, APIs
Senior Software Engineer
2019 - 2020
J.B. Hunt Transport
- Designed and architectured the integration of two mobile applications into one app. I led a team that took a mobile app for shippers and another app for receivers and combined the two.
- Maintained and enhanced features of REST APIs using Java and Spring Boot.
- Led a team of four offshore developers along with one onshore junior developer.
- Oversaw the deployment of test versions of the mobile to various product owners and customers. Also led the deployment of mobile apps to both the Apple App Store and Google Play.
Technologies: Spring Boot, React Native, Azure, Firebase, Git, CI/CD Pipelines, Team Leadership, Remote Team Leadership, RESTful Services, SQL, JavaScript, Mobile Development, iOS, APIs
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 and 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), Spring Boot, RESTful Services, JavaScript, Mobile Development, iOS, Minimum Viable Product (MVP), Startups, APIs
Software Developer
2018 - 2019
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 JavaServer pages to React.
Technologies: Git, Jenkins, React Native, React, jQuery, JavaScript, SQL, Hibernate, MyBatis, Spring, Java, Spring Boot, RESTful Services, APIs
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, RESTful Services, JavaScript, APIs
Software Developer
2016 - 2016
Stanfield 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, RESTful Services, JavaScript, 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, RESTful Services, SQL, APIs
Experience
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.
Skills
Languages
Java, SQL, JavaScript, TypeScript, HTML, CSS, C#, C++, Visual Basic, HTML5
Frameworks
React Native, Redux, Spring Boot, Spring, Hibernate, .NET, JPA, Jakarta Server Pages (JSP)
Paradigms
Mobile Development, Agile
Libraries/APIs
React, jQuery, REST APIs, MyBatis, Node.js, JDBC, AWS Amplify
Tools
Git, WebStorm, IntelliJ IDEA, DataGrip, Xcode, Android Studio, Jenkins, Servlet, Amazon Cognito
Platforms
Firebase, Mobile, 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, Minimum Viable Product (MVP), Startups, APIs, TIBCO, RESTful Services, CI/CD Pipelines, Team Leadership, Remote Team Leadership
Education
2006 - 2013
Bachelor's Degree in Electrical Engineering
University of Alabama at Birmingham - Birmingham, Alabama
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