Senior Full Stack Engineer with 9+ years of experience building scalable, high-performance web and mobile applications. Strong background in Python, PHP, and JavaScript/TypeScript, with expertise in REST/GraphQL APIs, microservices, and real-time systems. Experienced in cloud-native architectures across AWS/GCP, containerization with Docker/Kubernetes, and building reliable end-to-end products using Agile practices. Focused on performance, reliability, and delivering strong user experiences.…

Krstoffr Nichole Villejo

Senior Full Stack Engineer with 9+ years of experience building scalable, high-performance web and mobile applications. Strong background in Python, PHP, and JavaScript/TypeScript, with expertise in REST/GraphQL APIs, microservices, and real-time systems. Experienced in cloud-native architectures across AWS/GCP, containerization with Docker/Kubernetes, and building reliable end-to-end products using Agile practices. Focused on performance, reliability, and delivering strong user experiences.…

Available to hire

Senior Full Stack Engineer with 9+ years of experience building scalable, high-performance web and mobile applications. Strong background in Python, PHP, and JavaScript/TypeScript, with expertise in REST/GraphQL APIs, microservices, and real-time systems.

Experienced in cloud-native architectures across AWS/GCP, containerization with Docker/Kubernetes, and building reliable end-to-end products using Agile practices. Focused on performance, reliability, and delivering strong user experiences.

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Skills

Experience Level

Python
Expert
Django
Expert
JavaScript
Expert
AWS
Expert
TypeScript
Expert
Symfony
Expert
SQL
Expert
React JS
Expert
PHP
Expert
Node.js
Expert
Laravel
Expert
Google Cloud
Expert
Docker
Expert
API
Expert
Kubernetes
Expert
GraphQL
Expert
PostgreSQL
Expert
GitHub
Expert
Stripe
Expert
MongoDB
Expert
Redis
Expert
PayPal
Expert
Tailwind
Expert
Bootstrap
Intermediate
Web Design
Intermediate
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Language

English
Fluent

Work Experience

Senior Full Stack Engineer at Apps Tango
August 1, 2020 - March 1, 2026
Led the development of a SaaS compliance platform using Python (Flask/Django), PHP (Symfony), React/Next.js, serving 15,000+ daily users and automating regulatory reporting for global financial operations. Designed and implemented microservices architecture with REST/GraphQL APIs and event-driven communication using Kafka, boosting system throughput by 30% and achieving 99.9% uptime. Integrated payment systems with Stripe and PayPal, processing 10,000+ monthly transactions while ensuring PCI-DSS compliance and reducing errors by 15%. Built reusable, maintainable React components, managed global state with Redux Toolkit, and optimized rendering performance using React Hooks. Engineered real-time dashboards for global operations, combining FastAPI backend services with React frontends for high-performance analytics. Designed optimized database schemas for PostgreSQL and MongoDB, implemented caching strategies with Redis, improving data access speeds and reliability. Configured Linux envi
Full Stack Engineer at Napse Global
December 1, 2018 - July 1, 2020
Developed a global travel booking platform using Python (Django), PHP (Laravel), Vue.js/TypeScript, supporting 8,000+ daily bookings and increasing user retention by 28%. Built REST/GraphQL APIs and integrated RabbitMQ for real-time notifications, handling 100,000+ API requests monthly with 99.8% uptime. Engineered ETL pipelines in Python and MySQL for analyzing travel data, enabling dynamic pricing and real-time availability updates. Designed modular Vue.js interfaces, optimizing performance via virtual DOM, lazy loading, and efficient state management with Vuex/Pinia. Developed reusable UI components with Vuetify and Tailwind CSS, ensuring consistent branding across web applications. Applied containerization with Docker, orchestrated deployments, and administered cloud environments for stability, scalability, and security. Enforced robust security practices including OAuth 2.0, JWT, API rate limiting, and monitoring using New Relic and ELK Stack.
Junior Software Developer at TechTIQ Solutions
August 1, 2016 - November 1, 2018
Contributed to a healthcare scheduling platform using Node.js, Python (Flask), React, improving booking efficiency by 20% for 5,000+ monthly users. Developed secure RESTful APIs with JWT authentication and rate limiting, ensuring compliance with healthcare regulations (HIPAA). Assisted in migrating legacy systems to GCP, leveraging cloud services for scalability, availability, and cost optimization. Built reusable components and services in React and Angular, implementing SPAs and modular architectures for maintainability. Developed automated test cases using PHPUnit and Selenium, contributing to improved application reliability. Participated in Agile development cycles, from requirements gathering to deployment and post-release support.

Education

Bachelor's degree, Computer Science at National University of Singapore
March 1, 2012 - July 20, 2016

Qualifications

Add your qualifications or awards here.

Industry Experience

Software & Internet, Financial Services, Healthcare, Travel & Hospitality, Professional Services
    Real-Time Trading Analytics Dashboard, 2025

    Designed and developed a cloud-native trading analytics platform supporting real-time market monitoring,
    portfolio tracking, advanced chart visualization, and AI-powered trading insights.
    Developed responsive frontend dashboards with React, TypeScript, and TradingView-style chart
    integrations.
    Built scalable backend APIs and WebSocket services using Node.js, FastAPI, and PostgreSQL to process
    high-frequency financial data with low latency.
    Implemented CI/CD pipelines, containerized deployment workflows, and cloud infrastructure automation
    on AWS.
    Tech Stack: React, TypeScript, Node.js, FastAPI, PostgreSQL, WebSockets, Redis, AWS, Docker, Kubernetes