Jonny Williams

WORK EXPERIENCE

Lennar – Remote                                                                                                                           June 2023 - PRESENT

Senior Frontend Engineer

• Developed responsive React.js web applications for the company’s SaaS platforms, utilizing JavaScript, HTML5, and CSS3 to enhance user experience and accessibility.
• Implemented state management solutions using Redux and integrated REST APIs and GraphQL for efficient data management across components.
• Ensured cross-browser compatibility and responsiveness using CSS-in-JS libraries like Styled Components and Emotion.
• Built cross-platform mobile applications using React Native, ensuring compatibility with both iOS and Android platforms.
• Integrated Next.js for SEO enhancement and improved application performance through static site generation (SSG) and server-side rendering (SSR).
• Secured APIs and frontend interactions using OAuth2 for authorization and JWT for secure token-based authentication.
• Adhered to OWASP best practices, ensuring frontend architecture resilience against common security vulnerabilities such as CSRF and SQL Injection.
• Leveraged AWS services (Lambda, EC2, S3) for serverless functions, reducing server costs and enhancing application efficiency.
• Employed Continuous Integration/Continuous Deployment (CI/CD) practices, automated testing with Jest, Cypress, and Selenium, and version control using Git.
• Used PostgreSQL for database management in application data handling.

eBay – Remote                                                                                                                                     Jan 2022 – Aug 2023

Senior Frontend Engineer 

• Led the development of a Personalized Product Recommendation Engine to enhance user engagement and optimize the customer experience using React.js and Next.js.
• Collaborated with cross-functional teams, including data scientists and product managers, to build a scalable system while utilizing remote collaboration tools like Microsoft Teams for effective communication.
• Utilized GraphQL for efficient data querying, ensuring users received relevant product suggestions instantly.
• Developed microservices using Node.js and TypeScript, enabling independent scaling and easier maintenance of applications.
• Implemented real-time data processing with Apache Kafka, allowing dynamic updates to recommendations based on user activity, achieving response times under 200ms.
• Deployed the system on AWS, using services like AWS Lambda for serverless computing and DynamoDB for scalable data storage.
• Ensured smooth orchestration of the microservices using Docker and Kubernetes to handle millions of users efficiently.
• Managed and queried data with SQL and PostgreSQL to enhance system functionality and reporting.

PwC – New York, NY                                                                                                                        May 2017 – Dec 2021

Full Stack Developer 

• Developed responsive React.js applications for healthcare services, focusing on enhancing user experience and mobile accessibility using JavaScript, HTML5, and CSS3.
• Collaborated with backend teams to integrate RESTful APIs and implemented OAuth2 to ensure secure, HIPAA-compliant user authentication.
• Utilized Python for developing data processing scripts and enhancing backend functionality, and contributed to team communication, demonstrating strong problem-solving skills.

Procore – Sydney, Australia                                                                                                          Jul 2014 – May 2017

Full Stack Developer 

• Developed React.js and React Native applications to enhance project management tools for the construction industry, focusing on building responsive, user-friendly interfaces across web and mobile platforms.
• Gained experience with SQL/T-SQL and MS SQL Server for managing data and improving reporting capabilities.

National University of Singapore - Singapore

Bachelor of Science in Mathematics and Computer Science, Jan 2010 - Jul 2014