Juan Santos

JUAN SANTOS Full Stack Engineer E - -  Makati, 1229, Metro Manila, Philippines SUMMARY SKILLS Experienced Full-Stack Engineer with a strong background in AdTech, InsurTech and E-commerce & Healthcare, specializing in modern frontend frameworks like React, NextJS, Vue.js combined with robust backend technologies such as Node.js, Python(Django, Flask, FastAPI) and microservices. With a proven track record at Pointwest, SmartDrive, Super ship and Base, I have developed and optimized highperformance, data-driven platforms that enhance ad delivery, policy management, and e-commerce engagement. Skilled in cloud computing (AWS), API development, AI Integration and database optimization, I focus on building scalable, reliable, and efficient full stack solutions that power digital innovation. • • • • 03/2023 - 02/2025 Quezon City, Philippines Developed Scalable Web Applications – Built and maintained React.js based dashboards for patient record management, improving accessibility and data visualization for healthcare professionals. Optimized API Performance – Designed RESTful APIs with Node.js, integrating with MongoDB to streamline data retrieval, improving response times by 31%. AI-Powered Predictive Health Monitoring – Integrated an AI-driven predictive analytics model that analyzed patient vitals and historical data to predict potential health risks (such as heart attacks or strokes) in real-time, enabling proactive care and improving patient outcomes by 22%. Cloud Deployment & Monitoring – Deployed applications using AWS (EC2, S3, Lambda) and set up monitoring with Datadog, ensuring high availability and performance. Enhanced Patient Data Security – Implemented OAuth and JWT authentication to ensure HIPAA-compliant secure access to patient records. • • • • • • • CSS3 Bootstrap Angular Next.js Context API 10/2021 - 02/2023 Tokyo, Japan Optimized digital insurance policy management by maintaining and enhancing a user-friendly Vue.js website, improving navigation and inquiry submission, leading to a 31% increase in user engagement. Designed and managed four microservices dedicated to policy data processing, integrating DynamoDB and PostgreSQL, which improved data retrieval speeds by 43%, ensuring quick access to policyholder information. Implemented AWS Lambda and Step Functions to automate claim processing workflows, reducing manual intervention by 53% and enhancing efficiency in policy underwriting and risk assessment. Established high test coverage (93%) by writing comprehensive unit tests for all functional components, ensuring policy calculations, premium estimations, and claim validations were accurate before deployment. Utilized GraphQL with AppSync to handle schema changes and ensure robust policyholder data mutations and premium calculations, improving data consistency across three microservices. Proactively monitored system performance with Datadog, reducing service downtime by 19%, ensuring high availability for quote generation, policy updates, and claims processing. Seamlessly deployed updates across three branches with zero conflicts, maintaining uninterrupted services for customers while enabling agile delivery of new features. • • • • • • • React.js Redux Tailwind CSS Node.js Python/Django FastAPI Webpack OAuth Mocha Cypress WCAG TDD Super base Microservices RESTful API Socket. Io GraphQL JWT Jest Selenium Scrum PWA Git AWS EDUCATION Bachelor's degree of Computer Science 08/2014 - 07/2018 LANGUAGES English 11/2019 - 09/2021 Filipino Native Intermediate KEY ACHIEVEMENTS   Tokyo, Japan Developed and maintained ad-serving platforms using Python (FastAPI), ensuring high availability and low-latency performance for ad delivery. Optimized MySQL database queries and implemented caching mechanisms (Redis, Memcached) to improve data retrieval speeds and reduce server load. Built APIs and integrated third-party ad networks to enable seamless data exchange between advertisers, publishers, and platform. Enhanced reporting and analytics dashboards, providing real-time insights on ad performance, impressions, and click-through rates. Implemented security best practices, such as input validation, CSRF protection, and SQL injection prevention, to safeguard user data and transactions. Collaborated with frontend developers to create responsive ad management interfaces, ensuring a smooth user experience for advertisers. Automated deployment processes using CI/CD pipelines, reducing manual errors and ensuring seamless feature rollouts. Proficient Japanese Full-Stack Developer Supership, Inc Vue jQuery Nagoya University Full Stack Developer SmartDrive HTML5 Flask Full Stack Engineer • TypeScript Express.js EXPERIENCE Pointwest JavaScript (ES6+)   Optimized AdTech System Efficiency Developed Scalable ad-serving APIs at Ad media, leveraging Python (FastAPI) and MySQL Optimizations, leading to faster add delivery and improved campaign performance Enhanced Insurance Data Processing Designed and maintained four microservices for vehicle policy management at Pie Insurance, integrating DynamoDB and PostgreSQL, improving data retrieval speed by 40%. Automated Policy Workflow Processing Implemented AWS Lambda and Step Functions to automate claims processing and policy underwriting, reducing manual intervention by 50%. Increased User Engagement in ECommerce Built and optimized React.js & TypeScriptbased UI components for Sephora's online store, leading to a 30% increase in user engagement. EXPERIENCE Frontend Developer BASE, Inc • • • • • • 08/2018 - 10/2019 Nagoya, Japan Developed reusable, modular components using React, TypeScript, and Styled Components to improve maintainability and scalability. Optimized performance by implementing lazy loading, code splitting, and memorization to reduce page load times and enhance the shopping experience. Integrated APIs for product catalogs, search, payments, and user authentication, ensuring smooth communication between frontend and backend services. Improved accessibility (a11y) and SEO by following WCAG guidelines and implementing server-side rendering (SSR) with Next.js. Maintained high code quality by writing unit and integration tests using Jest and React Testing Library, while following best practices and participating in code reviews. Collaborated with cross-functional teams to launch new features, promotions, and seasonal updates, ensuring seamless alignment with marketing campaigns.