Jeff Santos

Skills

• DevOps & Systems Management: Linux, Docker, Amazon AWS (S3, EC2, CloudWatch), Microsoft Azure, CI/CD pipelines, MVC, OpenVPN, SSH, Git, Bash, SMTP, SFTP, Kubernetes, Terraform
• Languages: TypeScript, Python, Nim, Swift, Objective-C, C, C++, Java, Liquid, Shell scripting
• Web and Mobile Development: React, React Native, HTML, CSS, XML, YAML, JSON, SwiftUI, Flutter, Responsive Design, Cross-platform Development
• Frameworks & Libraries: Redux (Sagas, Toolkit), Node.js, Express, Tornado, HAProxy, Nginx, Flask, Django, Serverless Framework
• Database Management: PostgreSQL, MySQL, MongoDB, Redis, NoSQL, SQLAlchemy, Database Optimization, Sharding, Data Replication
• Integrations: Shopify, Stripe, SendGrid, OneTrust, JWT, Keycloak, OAuth 2.0, Contentful, Slack Webhooks, RESTful APIs, GraphQL, Microservices, WebSockets

Experience

• Led development of scalable healthcare solutions with a highly optimized microservices architecture using React, Styled Components, TypeScript, Redux Sagas, Python (Tornado), and MySQL.
• Implemented a robust component versioning system for recall management, ensuring regulatory compliance and enhanced flexibility for version control.
• Architected RESTful APIs for complex test types, integrating back-end systems to handle high-throughput data with optimized API performance.
• Enhanced the system to accommodate a wide range of medical tests (HPV, STI, HbA1c) by implementing optimized database architectures and integrating a CI/CD pipeline for seamless deployment of new test types.
• Executed critical database migrations of over 5000 lines while maintaining zero downtime and ensuring data consistency for 4 million+ users.
• Orchestrated front-end migration from React Redux to Redux Toolkit, enhancing developer productivity and reducing bundle size.
• Enabled asynchronous data processing for faster test results and improved system throughput.

• Developed a highly available cloud storage platform with React, TypeScript, and a Python/Tornado API integrated with AWS EC2, S3, and PostgreSQL.
• Integrated Stripe for secure payment processing, enhancing transaction reliability using SSL certificates and advanced encryption methods.
• Monitored and maintained the production environment using Slack webhooks, HAProxy, and Docker containers for streamlined operational insights.
• Developed custom cron jobs for managing multipart uploads and triggering automated email notifications for customers.

• Engineered a scalable real estate platform with Node.js and Keycloak for secure authentication, integrated with the Toronto Regional Real Estate Board (TRREB) via Ampre API using OData.
• Developed a custom property search client, utilizing trial-and-error solutions to resolve sparse API documentation and optimizing API request-response cycles.
• Implemented a secure, highly performant back-end using OAuth 2.0 and JWT-based authentication for data integrity and user privacy.

Projects

• Developed NTML, a highly extensible HTML Domain-Specific Language (DSL) written in Nim, designed to enhance front-end development with a React-inspired component model.
• Utilized Nim Macros and Templates to streamline web development workflows, improving code maintainability and developer experience.

• Developed an iOS weather application using Swift, incorporating Core Data and plist for efficient data management and persistence.
• Accrued a user base of over 17 thousand, with two thousand active daily users.
• Incorporated ads using Google AdMob to monetize user activity.
• Migrated the application to the OpenWeather 3.0 API for real-time weather data retrieval, improving the app's accuracy and reliability.

• Developed a hierarchical note-taking app using NoSQL querying techniques to allow users to link ideas and notes with advanced data aggregation methods.

• Founded and led a renovation business, overseeing both residential and commercial projects with a focus on operational efficiency and cost control in high-pressure environments.
• Managed cross-functional teams, ensuring safety compliance and timely project completion.