DAVID WALTON

12176363316 • davidwalton0316@gmail.com • Huntington, TX, United States • Open to Remote • LinkedIn

Fullstack Developer

As a FullStack developer with 11 years of experience in mobile app and web development, I possess the expertise and
skills needed to create exceptional mobile applications that meet the needs of clients and exceed the expectations of users.
With extensive knowledge in JavaScript, Redux, and React Navigation, I have created numerous cross-platform
mobile applications that work seamlessly on both Android and iOS platforms. I am experienced in developing custom
native modules to add functionality to applications, utilizing RESTful APIs, and optimizing performance to ensure
smooth and efficient app performance. In my years of experience as a senior developer, I have become adept at agile
methodology and working collaboratively within a team. I prioritize the importance of code reviews to ensure high
quality, well-documented code that is scalable and maintainable. I have experience working with Git and GitHub, and I
am proficient in debugging to resolve any issues that may arise during the development process. In addition to my
technical expertise, I also have strong leadership skills, and I have led teams in various projects from ideation to launch. I
am well-versed in project management and have experience utilizing tools such as Trello and Slack to keep projects on
track. As a UI/UX design enthusiast, I have a keen eye for detail and strive to create visually stunning and intuitive
interfaces. I am also experienced in TypeScript and Firebase and I have utilized Expo to streamline the development
process. My experience as a senior React Native developer has provided me with a deep understanding of mobile app
development best practices, as well as an ability to identify and implement creative solutions to complex problems. I am
confident in my ability to bring value to any project I work on, and I am excited to continue to develop my skills and
knowledge as a leader in the industry. A full stack developer with an emphasis in frontend technology. I use tools and
technologies such as TypeScript, React, Python, React Native, SQL and Node to develop a variety of products.

Professional Experience

iHealth and Wellness Foundation, Inc, Jul 2021 - Present

Full-stack Developer New York, NY, US
Built Optimaxx, a task-management and productivity web app, using React/Next.js and FaunaDB. (optimaxx.io).
Developed a full-stack web application using Django, a Python-based web framework, for a caterers' food ordering
and delivery platform. Operated and maintained the platform for a year, including rolling out multiple new features
and multiple updates.
Created a full-stack web application using Django (Python) for the back end and Vue (JavaScript) for the front end for
a math schoolwork ed-tech startup.
Developed an industrial logbook application for a large oil company to track maintenance and operation events by
multiple shifts using Django (Python).
Built an API using the Django REST Framework for a decentralized version of DoorDash, with both vendor and
delivery apps connected to the API.
Built Borealhead, an electronic daily journal app. It is a full-stack web app built with React, using the Next.js
framework, with user authentication/authorization, user data encryption, and a combination of server-side and client-
side rendering.
Developed an industrial alarm classification system for industrial events and alarms, with a machine learning
algorithm to identify the root cause of failures. Built using the Keras deep learning library (Python).
Built a simple DApp using Web3.js on the Ethereum network. The DApp interacts with a smart contract and has a
React front-end user interface. Two users can play a game and stake ether, and the winner is paid the full balance.
Developed client-server applications using NodeJS, achieving efficient, scalable communication and data processing.
Developed a responsive, user-friendly front-end using React with TypeScript and Redux for state management.
Implemented server-side rendering (SSR) with Next.js to enhance SEO performance and reduce initial load times,
resulting in a 25% increase in organic traffic.
Developed with front-end technologies: Created interactive user interfaces using JavaScript, JSF, and Prime Faces
7.0(12 years), ensuring responsive and user-friendly web applications.
Designed and implemented data encryption systems to ensure GDPR and HIPAA compliance for user data.
Created real-time dashboards for analytics and reporting using React and D3.js, offering actionable insights for
stakeholders.
Integrated third-party services, such as Twilio for SMS notifications and PayPal for secure payments, into multiple
platforms.
Collaborated with cross-functional teams to refactor legacy monolithic architecture into microservices, improving
scalability and maintainability.
FragranceX, May 2016 - May 2021
Senior React Native and Front-End Developer, Hauppauge, New York, US
Created a iOS and Android mobile app in React Native and integrated it with Firebase to provide a comprehensive
food ordering solution featuring location-based services, advanced menu options, payments, loyalty programs, and
order tracking.
Worked for FragranceX, one of the biggest US-based eCommerce stores. Every "pixel" on the web was important,
and my focus on details came to the fore.
Developed a mobile application within the planned timeframe, from a client's idea into a fully functional product
ready for user acquisition.
Built a React Native application from scratch that was intended as a ticket scanner connected to a few servers with
non- SQL and SQL databases.
Contributed to developing the React Native application that consisted of multiple solutions, including communication
between scanners, offline mode, and tons of logs. Event organizers could hire to ensure a smooth process.
Worked on a mobile application for payment and ordering processes related to restaurants and bars. The app provides
a solution for connecting to more than 50,000 cash registers. One solution enables users to make orders and pay with a
QR code.
Designed a system, created a mobile app and the UI/UX and connected with the payment gateway. Worked on it for
a little over two years; millions were paid without any mistakes or wrong orders, and I have a reason to be satisfied
with the project.
Integrated third-party APIs, including Stripe for payment processing, Firebase Authentication for secure logins, and
Google Maps for location-based features.
Conducted performance profiling using React Profiler and Flipper, resolving bottlenecks and improving animation
smoothness by 50%.
Designed and implemented a scalable architecture using Redux and MobX, reducing crash rates by 30% and
improving code maintainability.
Designed custom push notification features using Firebase Cloud Messaging, increasing user engagement by 20%.
Integrated analytics tools like Google Analytics and Mixpanel for tracking user behavior, enabling data-driven
improvements to the app.
Optimized the user interface and experience; developed the JavaScript front-end solutions and created a fully
responsive web.
Designed and developed the company website and improved the UI/UX for responsive websites.
Worked with a team of engineers and data scientists to design and build a data pipeline to support freight
consolidation and carrier assignment planning systems for middle-mile trucking.
Oversaw an experiment evaluating the impact of a new email scheduling feature on one of the company's key metrics:
on- time performance.

Stantec Consulting Aug 2014 - Mar 2016

Software Engineer Baton Rouge, Louisiana US
Wrote Java and SQL to execute retrospective longitudinal studies over a database of medical records and correlated
environmental/socioeconomic data. Queries ran on AWS Redshift over billions of records.
Sped up a central algorithm for matching cases to controls to run 50 times faster. Optimizations included re-
representing a join table to be 10X smaller and reducing the size of the input by randomly sampling from the set of
controls.
Coded data perturbation and suppression algorithms to satisfy HIPAA de-identification requirements.
Developed a new SPA-style web app for administering firewalls and specifying access policies for classified web-
based services.
Overhauled a complicated GWT-based application module for handling the workflow for requesting and approving
personnel access to classified programs.
Integrated new and existing applications into an OpenAM-based single-sign-on framework to support access-
controlled user sessions based on authorizations returned by the SSO server.
Profiled and diagnosed performance issues in our SSO service until it met performance requirements and doubled the
requests/minute.
Performed background research, interviewed experts, and wrote the final report for an SBIR Phase I projected to build
an expert system to assist in estimating Human Systems Integration costs in Naval acquisitions.
Enhanced security across the platform by implementing OAuth 2.0 and JSON Web Token (JWT) authentication for
secure access control, and Spring Security for role-based access management (RBAC), preventing unauthorized
access to sensitive areas such as admin panels and payment modules.

Georgia Tech Research Institute, Nov 2012 - Jun 2014

Back End Engineer Atlanta, Georgia, US
 Built the web application prototype using Django (Python) with Stripe payments integration and Bootstrap CSS
framework for front-end styling. Celery (Python) integration for asynchronous email sending tasks with Postman
integration.
Created a custom web application for an external client using PHP and MySQL that allows users to enter Aboriginal
language verbs and automatically conjugates them.
Built several custom standalone websites with content management system capability for professional use by
faculty, university institutes, academic journals, and student groups, using WordPress, Moodle, and CMS Made
Simple (PHP, HTML, and CSS).
Delivered robust, high-performing solutions by leveraging a tech stack that includes React, Node.js, Express.js, and
TypeScript.
Enhanced the functionality and user experience by implementing an online editor to create and edit documents in the
platform by forking directly into a library and analyzing and modifying it to customize the behavior.
Achieved a faster and more efficient service by designing and implementing a microservices architecture to reduce the
amount of data received and request-response time.
Designed and implemented an automated data ingestion pipeline for analyzing academic journal statistics, reducing
manual workload by 80%.
Enhanced database indexing and implemented custom query optimizations, reducing data retrieval times by 40%.
Built RESTful APIs to support integration between multiple government agency systems, ensuring secure and
efficient data exchange.
Developed a monitoring system using Django and Grafana to track performance metrics and alert teams to anomalies.
Contributed to the creation of a knowledge management platform for researchers, using Flask and Elasticsearch for
full-text search capabilities.
Collaborated with UX designers to create a responsive front-end interface using Bootstrap and custom CSS.
Implemented CI/CD pipelines using Jenkins, enabling automated deployments and testing for all applications.

Education
Stephen F. Austin State University, United States, B.A in Computer Science, Aug 2009 - Aug 2013

Core Competencies

Programming Languages: JavaScript, TypeScript, Python, Java, PHP, SQL

Mobile Development: React Native, Cordova, Ionic
Frontend Development: React, Angular, Vue, HTML5, CSS3, Bootstrap, Redux, Next.js, React Navigation
Backend Development: Node.js, Express.js, Django (Python), PHP, RESTful APIs, microservices architecture
Cloud & DevOps: AWS (Redshift, S3, Lambda), Azure, Firebase, CI/CD (Jenkins, GitHub Actions), Docker, Kubernetes
Frontend Frameworks: React.js, Angular 6+, Vue.js, React Navigation, Redux
Backend Frameworks: Django, Express.js, Django REST Framework, Flask, Next.js
Data Handling: Redux for state management, Axios for API handling, Celery for asynchronous tasks
Machine Learning & Data Processing: Keras (deep learning), Python data libraries for big data processing
RDBMS & NoSQL: MySQL, PostgreSQL, SQL Server, Oracle, MongoDB, FaunaDB, AWS Redshift
Content Management Systems: WordPress, Moodle, CMS Made Simple
REST & SOAP APIs: Experienced in designing, developing, and consuming RESTful and SOAP APIs
SSO & Authentication: OpenAM-based SSO, Firebase authentication, user data encryption for security
Project Management Tools: JIRA, Trello, Slack, GitHub for collaboration and task tracking
Version Control: Git, GitHub, Bitbucket, SVN for source code management and team collaboration
Blockchain & Web3: Built a simple DApp using Web3.js on Ethereum with smart contracts for decentralized
applications
Single-Page Application (SPA) Development: Expertise in SPA design and architecture, particularly for secure and
high- traffic applications