Open to opportunities

Jay Ralph Mandanhuyan

@jayralphmandanhuyan

Hi, I’m Jay, a Full Stack Developer with 7+ years building web apps, APIs, and cloud solutions using React, TypeScript, Node.js, Python, and AWS.

United States

Message

What I'm looking for

I’m looking for a full-stack engineering role where I can build scalable products, solve challenging technical problems, and contribute from development to deployment. I’m interested in teams that value ownership, collaboration, and modern technologies, especially cloud and AI-driven solutions.

I’m a Full Stack Developer with 7+ years of experience building web applications, APIs, cloud-based systems, and AI-powered solutions. My main expertise is in React, Next.js, TypeScript, Node.js, Python, PHP, PostgreSQL, Docker, and AWS.

Throughout my career, I have worked on SaaS platforms, mobile applications, automation tools, payment integrations, and enterprise systems. I enjoy owning projects end-to-end, from understanding requirements and designing architecture to development, deployment, and production support.

Recently, I have focused on AI application development, including LLM integrations, RAG systems, and automation workflows. I enjoy exploring new technologies, solving complex problems, improving system performance, and building products that create real value for users.

I’m especially interested in startups and product-focused teams where I can contribute technically, take ownership, and collaborate closely with others to turn ideas into reliable software.

Experience

Work history, roles, and key accomplishments

Senior Full Stack & AI Developer

SeaFair

May 2024 - Apr 2026 (1 year 11 months)

I led a 6-member cross-functional team to build and launch a hospitality web and mobile platform using React, React Native, Next.js, NestJS, and PostgreSQL. I developed scalable frontend components, backend APIs, mobile features, and AI-powered workflows. I integrated Stripe payments, deployed the platform on AWS, and managed Agile development processes to deliver a reliable user experience.

Remote React React Native Next.js NestJS PostgreSQL Python REST APIs GraphQL Android iOS Push Notifications biometric authentication Camera Access Data Analysis

Full Stack Developer

Skigit

May 2022 - Apr 2024 (1 year 11 months)

I developed scalable web applications using Python, Django, and Angular, building REST APIs, responsive interfaces, and optimized database systems with PostgreSQL and MySQL. I implemented AI-powered recommendations and content moderation features, improved performance through caching and optimization, and used Docker, Agile, TDD, and Git to deliver reliable software.

Remote REST APIs Python Django Angular Lazy Loading Caching Strategies PostgreSQL MySQL MongoDB GraphQL Machine Learning Content Moderation Docker AWS fastAPI Zapier N8n LLM JWT Azure CMS Git Jira Agile DevOps

Staff Software Engineer

Ministry of National Guard - Health Affairs

Jul 2016 - Apr 2022 (5 years 9 months)

I developed booking platforms using HTML, CSS, JavaScript, Bootstrap, C#/.NET, and Java, creating responsive interfaces and integrating REST APIs. I improved user experience through UI optimization, managed multiple projects, performed cross-browser testing, and delivered high-quality software with strong code quality and reliability.

Remote HTML CSS JavaScript Bootstrap jQuery C# .NET Java Sitefinity Content Migration Responsive Design React TypeScript MongoDB REST APIs

Junior Web Developer

Nakayama Technology Corporation

Apr 2012 - Dec 2015 (3 years 8 months)

Built a Warehouse Management System with CRUD functionality using PHP and MySQL, improving data retrieval efficiency by 30%. Improved UI performance and responsiveness using HTML5/CSS3/Bootstrap/jQuery/JavaScript and optimized server response times by 40% using AJAX and JSON.