
Kerwin Anthony J. Tang
Verified Expert in Engineering
Full-stack Developer
Manila, NCR, Philippines
Toptal member since September 30, 2017
Kerwin is an experienced full-stack developer, with 14 years of solid experience in web and mobile application development using the latest technologies. He also has extensive experience leading software development teams, project management, systems architecture, and salesforce.com.
Portfolio
Experience
- JavaScript - 20 years
- Java - 14 years
- Grails - 8 years
- React - 7 years
- Node.js - 5 years
- Salesforce - 4 years
- React Native - 3 years
- Omnichannel Marketing - 2 years
Availability
Preferred Environment
Xcode, Visual Studio Code (VS Code), MacOS
The most amazing...
...project I've worked on is a cloud-based medical records mobile app built on React Native and NodeJS. I did it all in 4 weeks!
Work Experience
Digital Engineering Lead
Security Bank
- Developed the security bank online banking app, acting as the lead engineer.
- Led a team of developers to build and manage the bank’s front-end and back-end services.
- Built POCs for new technologies that can help our company.
Front-end Engineer
Kalepa
- Developed Kalepa Copilot application. Built the front-end application with React.
- Engineered web crawlers that ingest data from different sources.
- Served as the technical lead in the development of the Copilot web application.
Senior Manager | Lead Developer
SMRI
- Built three mobile apps for an eCommerce and product catalog using React Native.
- Created a gift registry site using React and Node.js.
- Developed a marketing web application using React.
- Built a back-end job for creating reports and sales invoices.
- Pioneered an omnichannel platform for the company, anticipating millions of users.
React Native Developer
Poliscore
- Built a mobile app prototype based on screen designs and wireframes.
Full-stack Engineer
Replenysh (via Toptal)
- Built a mobile app with QR Code scanning capability using React Native.
- Worked with SMS notifications to multiple users using Front App.
- Helped create new features for the company's main website using React, NodeJS, and ElmJS.
Lead Software Developer | Senior Manager
MBTC
- Developed the bank's mobile banking application built on Cordova, AngularJS, and a Jakarta EE back end. Integrated with third-party services like Google Places and telecom services.
- Built an in-house rewards application system using Groovy on Grails and MySQL, integrating with Active Directory.
- Created an interactive employee portal built on Meteor and MongoDB.
- Managed a small development team of full-stack developers that created small POC applications.
- Contributed to the architectural design of the omnichannel platform built on microservices architecture based on a cloud infrastructure.
Director of I.T.
JWay Group, Inc.
- Developed multiple projects across domains including, but not limited to, supply chain, inventory, remittance, multi-level marketing, manufacturing, warehouse, medical industry, games, social media, etc.
- Built a large-scale web and mobile application to help one of our global supply chain clients, using iOS, Android, and Ruby on Rails.
- Contributed to the development of a remittance application that integrates with the largest banks in the Philippines, built on Groovy on Grails and a MySQL database.
- Led a software development team of 20 developers that built multiple web and mobile application solutions.
- Built in-house applications for enterprise clients like Sun Microsystems, Visa, etc., using Salesforce.com solutions.
- Certified as a Salesforce.com developer for six years.
Senior Software Developer
Azeus Systems Philippines Inc.
- Developed multiple web application projects for HK government using a Java-based in-house MVC framework.
- Built an in-house time-tracking tool using VB.Net.
- Performed HTML/CSS/Javascript training for new developers.
- Performed Technical Lead roles on major projects including code reviews, mentorships, and code improvements on our big projects.
- Implemented Performance Tuning on enterprise applications which include performance enhancement on SQL queries accessing millions of records; code improvements on sub-optimal blocks of code; and the use of stress test tools like LoadUI and Microsoft Web Application Stress Tool.
Experience
Ace Hardware Philippines App (iOS/Android)
Replenysh (iOS/Android)
https://www.replenysh.comAppliance Center Catalog (iOS/Android)
https://www.smappliance.com/App is used internally in-store, so it is not publicly available via app store/play store. However, the web version is publicly available.
Poliscore App (iOS/Android)
Home Product Catalog App (iOS/Android)
Knock Knock App
Medi-Q
Smart appointments, queueing, and patient profiles are all available on the app, anytime, anywhere.
Education
Bachelor of Science Degree in Computer Science
University of the Philippines - Diliman, Quezon City, Philippines
Skills
Libraries/APIs
React, Node.js, API Development, jQuery, REST APIs, Chai, React Redux
Tools
Git, GitHub, Android Studio, Xcode, Mocha, React Apollo, Jira, Auth0, Postman, Bitbucket, Figma, Google Analytics
Languages
HTML, CSS, Java, JavaScript, SQL, HTML5, PHP, Objective-C, Groovy, TypeScript, GraphQL, Ruby, Elm, Python
Frameworks
React Native, Grails, Android SDK, Redux, Express.js, Next.js, Jest, Material UI, MUI CSS, Ruby on Rails (RoR), Spring Boot
Paradigms
UX Design, Object-oriented Programming (OOP), Agile, Agile Software Development, Mobile Development, HIPAA Compliance
Platforms
MacOS, Linux, iOS, Salesforce, Visual Studio Code (VS Code), Jakarta EE, Adobe ColdFusion, Amazon Web Services (AWS), WordPress, Android, Docker, Firebase
Storage
PostgreSQL, MySQL, Oracle 11g, MongoDB
Industry Expertise
Project Management
Other
Product Design, Analytics, Performance Optimization, Front-end, APIs, Data Visualization, Web Applications, Team Leadership, Full-stack, Front-end Development, Architecture, Technical Leadership, Algorithms, Web Development, Back-end, Responsive Web Apps, Innovation, Omnichannel Marketing, Salesforce Apex, Salesforce.com Developer Certification, Key Performance Indicators (KPIs), eCommerce, Fintech, User Experience (UX), SaaS, CTO, User Interface (UI), Cordova
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