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I am a Software Developer with over 3 years of professional experience designing, implementing, and deploying scalable, high performance software solutions. I specialize in mobile development using React Native and Expo, and have contributed significantly to successful launches and improvements of user experiences in various applications. I am proficient with both frontend and backend technologies, including AWS cloud services, CI/CD pipelines, and analytics implementation. Throughout my career, I have taken on leadership roles, managed full-stack deployments, and improved code quality through testing and refactoring. I enjoy solving challenging problems and continuously learning new technologies like Ruby on Rails and GraphQL to enhance my skill set. My passion lies in building efficient and high-quality mobile experiences that provide measurable user engagement and positive business outcomes.…I am a Software Developer with over 3 years of professional experience designing, implementing, and deploying scalable, high performance software solutions. I specialize in mobile development using React Native and Expo, and have contributed significantly to successful launches and improvements of user experiences in various applications. I am proficient with both frontend and backend technologies, including AWS cloud services, CI/CD pipelines, and analytics implementation. Throughout my career, I have taken on leadership roles, managed full-stack deployments, and improved code quality through testing and refactoring. I enjoy solving challenging problems and continuously learning new technologies like Ruby on Rails and GraphQL to enhance my skill set. My passion lies in building efficient and high-quality mobile experiences that provide measurable user engagement and positive business outcomes.

Jeffery Yeung

Developer, Full Stack Developer, App Developer, +1

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I am a Software Developer with over 3 years of professional experience designing, implementing, and deploying scalable, high performance software solutions. I specialize in mobile development using React Native and Expo, and have contributed significantly to successful launches and improvements of user experiences in various applications. I am proficient with both frontend and backend technologies, including AWS cloud services, CI/CD pipelines, and analytics implementation. Throughout my career, I have taken on leadership roles, managed full-stack deployments, and improved code quality through testing and refactoring. I enjoy solving challenging problems and continuously learning new technologies like Ruby on Rails and GraphQL to enhance my skill set. My passion lies in building efficient and high-quality mobile experiences that provide measurable user engagement and positive business outcomes.…I am a Software Developer with over 3 years of professional experience designing, implementing, and deploying scalable, high performance software solutions. I specialize in mobile development using React Native and Expo, and have contributed significantly to successful launches and improvements of user experiences in various applications. I am proficient with both frontend and backend technologies, including AWS cloud services, CI/CD pipelines, and analytics implementation. Throughout my career, I have taken on leadership roles, managed full-stack deployments, and improved code quality through testing and refactoring. I enjoy solving challenging problems and continuously learning new technologies like Ruby on Rails and GraphQL to enhance my skill set. My passion lies in building efficient and high-quality mobile experiences that provide measurable user engagement and positive business outcomes.

Available to hire

I am a Software Developer with over 3 years of professional experience designing, implementing, and deploying scalable, high performance software solutions. I specialize in mobile development using React Native and Expo, and have contributed significantly to successful launches and improvements of user experiences in various applications. I am proficient with both frontend and backend technologies, including AWS cloud services, CI/CD pipelines, and analytics implementation.

Throughout my career, I have taken on leadership roles, managed full-stack deployments, and improved code quality through testing and refactoring. I enjoy solving challenging problems and continuously learning new technologies like Ruby on Rails and GraphQL to enhance my skill set. My passion lies in building efficient and high-quality mobile experiences that provide measurable user engagement and positive business outcomes.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Work Experience

Software Engineer at Built With Science

February 1, 2025 - August 11, 2025

Contributed to the successful launch of BWS+, reaching over 10,000 monthly active users with positive revenue impact. Refactored the main Lessons Tab using React Native and Expo, resulting in a 30% increase in traffic. Utilized AWS Datastore backend, including DynamoDB and EC2 services to enhance development. Developed a CI/CD pipeline with end-to-end testing using Maestro and GitHub Actions to improve code quality and testing standards.

Software Engineer at Borrowell

April 1, 2023 - August 11, 2025

Led mobile development on the client side using Expo and React Native, overseeing codebase improvements and ensuring high-quality release cycles. Enhanced mobile client code quality with unit and integration tests in TypeScript and Jest. Managed user tracking analytics to support A/B testing with Segment and Google Analytics.

Software Engineer I & II at Kora

March 1, 2022 - August 11, 2025

Assumed the Team Lead role during major transitions and senior developer departures to release the flagship product. Managed full stack deployment of frontend and backend changes including Expo, React Native (EAS OTA), and microservices on AWS Cloud. Handled backend API development using AWS API Gateway connecting Node.js and Ruby on Rails microservices. Designed and implemented a full-stack feature for the Kora Card Home screen with animations and payment history views.

Software Engineer Intern at Kora

April 1, 2021 - August 11, 2025

Improved mobile notifications design through Google Firebase with Node microservice implementation. Investigated and resolved performance issues that improved first load times by 50%, substantially enhancing user satisfaction. Learned and applied Ruby on Rails and GraphQL to create backend features.

Software Engineer - Mobile at Built With Science

February 1, 2025 - August 11, 2025

Contributed to the successful launch of BWS+, achieving over 10,000 monthly active users with positive revenue. Refactored the main Lessons Tab using React Native and Expo, resulting in a 30% increase in traffic to that tab. Utilized AWS Datastore backend with DynamoDB and provisioned EC2 services to accelerate development. Developed a CI/CD pipeline with end-to-end testing using Maestro and GitHub Actions to improve code quality and testing.

Software Engineer - Mobile at Borrowell

April 1, 2023 - August 11, 2025

Led mobile development efforts on the client-side using Expo and React Native, overseeing codebase improvements and ensuring high-quality release cycles. Improved mobile client code quality and assurance with unit and integration tests in TypeScript and Jest. Managed user tracking analytics to implement A/B testing with Segment and Google Analytics.

Software Engineer I & II at Kora

March 1, 2022 - August 11, 2025

Assumed team lead role during major transitions and senior developer departures to release the flagship product. Managed full-stack deployment of frontend and backend changes using Expo, React Native (EAS OTA), and microservices on AWS Cloud. Managed backend API integration through AWS API Gateway connecting Node.js and Ruby on Rails microservices. Designed and implemented a full-stack feature for the Kora Card Home screen including animations and a payment history view.

Software Engineer Intern at Kora

April 1, 2021 - August 11, 2025

Improved mobile notifications design through Google Firebase using Node microservice implementation. Investigated performance issues which improved first load times by 50%, substantially boosting user satisfaction. Adopted Ruby on Rails and GraphQL to create backend features.