Senior Full Stack Software Engineer with 10 years of experience building scalable web and mobile applications using Angular.js, React.js, Node.js, and TypeScript. Experience includes integrating front-end and back-end systems, optimizing performance, and implementing secure solutions including blockchain smart contracts. Collaborates cross-team using pragmatic development practices to improve user engagement and operational efficiency, delivering healthcare, gaming, and SaaS platforms through secure integrations, localization, and performance-focused engineering.

Jemelito Constantino

Senior Full Stack Software Engineer with 10 years of experience building scalable web and mobile applications using Angular.js, React.js, Node.js, and TypeScript. Experience includes integrating front-end and back-end systems, optimizing performance, and implementing secure solutions including blockchain smart contracts. Collaborates cross-team using pragmatic development practices to improve user engagement and operational efficiency, delivering healthcare, gaming, and SaaS platforms through secure integrations, localization, and performance-focused engineering.

Available to hire

Senior Full Stack Software Engineer with 10 years of experience building scalable web and mobile applications using Angular.js, React.js, Node.js, and TypeScript. Experience includes integrating front-end and back-end systems, optimizing performance, and implementing secure solutions including blockchain smart contracts.

Collaborates cross-team using pragmatic development practices to improve user engagement and operational efficiency, delivering healthcare, gaming, and SaaS platforms through secure integrations, localization, and performance-focused engineering.

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Experience Level

Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Intermediate
Intermediate
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Language

English
Fluent

Work Experience

Lead Developer at Chicken Derby
October 1, 2020 - February 1, 2024
Designed and deployed secure blockchain smart contracts in Solidity for player interactions and asset transactions. Built scalable backend infrastructure with Node.js and optimized database queries to support thousands of concurrent players and smooth API interactions. Developed core game mechanics integrating React.js and Phaser while maintaining blockchain asset ownership and trading features. Implemented multi-layered security protocols to protect player assets and improve platform trustworthiness.
Web/Mobile Developer at CoachCare
June 1, 2020 - September 1, 2025
Developed a personalized weight loss program platform using Angular.js and Node.js to improve patient adherence and engagement across clinics. Implemented a WebRTC-based video conferencing feature to enable virtual appointments. Localized the platform with TypeScript to support multiple languages and regions. Added interactive data visualization charts using Angular.js to help healthcare providers track patient progress and improve clinic operational efficiency. Built and maintained integrations for healthcare workflows supporting remote patient monitoring and chronic care programs at scale.
Backend Developer at GoGoGrandparent
July 1, 2018 - July 1, 2020
Optimized backend services using Node.js and MySQL to reduce system load times by 20%, improving platform responsiveness and user experience. Developed internal web applications with Vue.js to streamline team communication and project management. Engineered GIS functionality for internal logistics and decision-making using real-time data visualization. Collaborated with cross-functional teams to improve backend architecture and deployment processes, increasing development efficiency.
Frontend Developer at Vendori
September 1, 2017 - July 1, 2018
Integrated a dynamic deal calculator with Salesforce using React.js and Node.js to improve sales team productivity and forecasting accuracy. Built responsive frontend components to streamline quote creation workflows. Resolved complex integration challenges between CRM APIs and internal systems to ensure data consistency and reliability. Collaborated with product and design teams to implement agile development practices and accelerate feature delivery.
Lead Developer at CrooklynClan
August 1, 2015 - August 1, 2017
Led end-to-end development of a DJ service web platform using React.js and Node.js for content uploads, previews, and downloads. Designed and implemented a transaction ledger system based on the accounting equation to ensure accurate financial tracking and integrity. Addressed complex data consistency issues to maintain reliable transaction records. Mentored junior developers and established coding standards to improve team productivity and code quality.

Education

BS in Computer Science at Surigao del Norte State University
January 1, 2009 - January 1, 2013

Qualifications

Add your qualifications or awards here.

Industry Experience

Healthcare, Gaming, Software & Internet