George Sarrion
Senior Full Stack Engineer
San Antonio, TX
Profile
A results-driven Senior Full Stack Engineer with 8 years of experience delivering high-quality web & mobile apps, workflow
automations, system integrations, and database solutions. Excellent at designing scalable architectures, optimizing workflow
processes, and automating business processes to enhance operational efficiency. Strong business analysis and solution design
capabilities, combining technical implementation with strategic business goals. Proven track record across diverse industries,
including SaaS, Healthcare, Finance, and Travel Portal, consistently delivering innovative and impactful solutions.
Skills
Programming — JavaScript | TypeScript | PHP | Python | Ruby
Frontend — React.js | Next.js | Angular.js | Vue.js | Storybook | D3.js | Three.js
Backend — Node.js | Nest.js | FastAPI | Django | WordPress | ASP.NET | Restful APIs | GraphQL | Web Socket | Kafka
Mobile — React Native | Expo | Flutter
Database Management — PostgreSQL | MongoDB | MySQL | Redis | VectorDB
Cloud & DevOps — Git | CI/CD | AWS (Lambda, EC2, S3) | GCP Azure | Docker | Kubernetes | Microservices
Testing & Quality Assurance — Jest | Cypress | Selenium | Playwright | PyTest | React Testing Library | Postman | Swagger
Integrations & Automation — OpenAI API | Anthropic API | LangChain | RAG | OAuth | Stripe | Make | N8N | Zapier
Methodologies — Agile | Scrum | Kanban | TDD | MVC | MVVM
Professional Experience
Senior Full Stack Engineer, BCA IT, Inc.
02/2023 – 07/2025 | Doral, FL
Developed a Digital Marketing System using React, Rails, PostgreSQL, and D3.js for interactive visual analytics, eliminating
third-party bottlenecks and reducing operational costs by 80%.
Integrated OpenAl, Anthropic API and Perplexity API to automate story research and generation, reducing campaign prep
time by 70% and improving storytelling quality at scale.
Built a real-time campaign dashboard with D3.js-powered interactive charts, live metrics, scheduling, and tracking, enabling
marketing teams to monitor performance and adapt strategies instantly.
Re-architected automation logic using serverless functions, enhancing email segmentation accuracy and boosting open
rates by 15%.
Leveraged AWS cloud services for reliable and secure hosting of the financial management system, achieving 99.9% uptime
and ensuring high availability and scalability.
Implemented GraphQL for efficient API query management, reducing query response times by 60%.
Utilized AWS CI/CD services to automate build, test, and deployment processes, accelerating release cycles by 30%.
Applied Test-Driven Development (TDD) using React Testing Library and leveraged Storybook for component isolation and
documentation, leading to a 50% reduction in bugs and improved frontend maintainability.
Built and optimized a React Native mobile application featuring an Al-powered legal assistant chatbot, increasing user
engagement by 35% and reducing response time for legal queries by 50%.
Integrated NLP algorithms to interpret user intent and context accurately, improving chatbot response accuracy by 30% and
user satisfaction scores by 25%.
Designed intuitive conversational flows for legal service discovery and advice processes, reducing user drop-off rate by 30%
and boosting conversion for legal services by 20%.
Published to the Google Play Store, ensuring 99.9% crash-free sessions and 4.6 user rating within the first quarter after
launch.
Led development of a fault-tolerant, high-performance API layer and a real-time video/call application used by hundreds of
insurance companies nationwide, handling 10k+ concurrent calls with 99.95% uptime.
Developed RESTful APIs and serverless MongoDB Atlas functions, reducing backend latency by 5%.
Designed and deployed containerized microservices using Docker-Kubernetes, decreasing infrastructure costs by 25% and
scaling seamlessly for 3x traffic spikes.
Managed migration of millions of legacy audio recordings during a post-merger infrastructure transition, completing 100%
data integrity transfer and reducing storage costs by 20% through codec optimization.
Mentored 3 junior developers; 2 were promoted within 12 months and team delivery rate improved by 20%.
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Full Stack Developer, Queryon
11/2020 – 12/2022 | Anchorage, AK
Built a HIPAA-compliant patient management system with React and FastAPI, implementing secure data protocols that led to
a 40% increase in registration efficiency and a 30% reduction in appointment scheduling time.
Optimized caching with Redis and improved real-time data exchange using a custom socket library, reducing application
downtime from 5 seconds to 1 second in the patient management system, boosting responsiveness and user experience.
Led a UI/UX redesign for web and mobile apps using React, React Native, and Tailwind CSS, resulting in a 30% increase in
user engagement and a more intuitive interface.
Enhanced database performance by deploying optimized DataMarts with SQL Server, reducing report generation time by 30
seconds and enabling faster decision-making.
Championed DevOps best practices by automating CI/CD pipelines with Azure DevOps, streamlining workflows, reducing
manual intervention, and speeding up release cycles by 25%.
Developed scalable microservices architectures with Node.js, FastAPI, and Docker, ensuring maintainability and high
availability; utilized Kubernetes for improved deployment and resource use.
Integrated third-party APIs and payment gateways, and developed middleware for authentication and security compliance,
enhancing user experience and system integrity.
Drove architectural improvements using Kafka and RabbitMQ for event-driven systems, enabling asynchronous data
processing and real-time analytics across distributed services.
Implemented Al-driven solutions using OpenAl's GPT models to enhance automation, customer support, and content
generation, increasing operational efficiency and engagement.
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Full Stack Engineer, Cal IT Group
08/2019 – 10/2020 | Huntington Beach, CA
Refactored frontend apps using Next.js and React Hooks, reducing codebase size by 30% and improving maintainability.
Built and scaled education applications for student and course management using React and Nest.js, improving engagement
and admin workflows by 40%.
Delivered e-commerce and data platforms using GraphQL and web scraping, increasing data efficiency by 30%.
Created reusable components (Tree View, Slide View, Table Grid) with Tailwind CSS, cutting UI development time by 20%.
Improved SEO and load speed by 30%, resulting in a 25% growth in organic traffic.
Integrated frontend and backend via RESTful APIs and designed scalable APIs handling 10,000+ requests/min.
Designed and implemented a Retrieval-Augmented Generation (RAG) architecture leveraging Vector Databases to power
intelligent, context-aware chatbot solutions.
Developed Al-powered recommendation systems that enhance user experiences, leading to a 25% increase in engagement.
Translated complex technical solutions into clear, actionable insights for non-technical stakeholders.
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Full Stack Web Developer, Techmedics
05/2018 – 07/2019 | Pasadena, CA
Achieved 95% design accuracy from Figma to React components.
Implemented Redux and Jotai for efficient state management, enhancing performance and reducing unnecessary rerenders.
Improved client-side performance through lazy loading, code splitting, and React Suspense, enhancing load speeds.
Developed scalable RESTful APIs with Express.js, reducing response times by 40% and improving backend efficiency.
Implemented JWT authentication for secure API access and enhanced user session management.
Integrated MongoDB with Mongoose ORM, optimizing query performance and ensuring fast, reliable data retrieval.
Designed and enforced JWT-based authentication and Role-Based Access Control (RBAC) to strengthen application security.
Utilized PostgreSQL for structured data storage, ensuring efficient relational database management.
Implemented caching strategies to reduce database load and improve response times.
Conducted code reviews to ensure code quality, maintainability, and compliance with best practices.
Applied advanced debugging techniques to resolve critical software issues, reducing bug resolution time by 25%.
Configured Webpack for optimized asset bundling and streamlined deployment processes, improving release efficiency.
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Junior Web Developer, Netrio
08/2017 – 04/2018 | McKinney, TX
Worked closely with designers to ensure 95% consistency between design and development, translating UI/UX designs into
fully functional websites using HTML, CSS, jQuery, and Bootstrap.
Collaborated with the team to gather software requirements and contributed to the development process, leading to a 15%
improvement in project delivery times.
Implemented complex user interface effects, animations, and custom plugins using jQuery, improving site interactivity and
functionality, resulting in a 20% increase in user engagement.
Translated Figma designs into React.js components, ensuring pixel-perfect alignment with design specifications and
achieving a 95% design accuracy rate.
Developed over 120 pixel-perfect HTML pages using pure CSS and JavaScript, ensuring responsiveness and supporting easy
application of seven themes, resulting in a 30% reduction in design inconsistencies.
Utilized Ajax and jQuery selectors to access various parts of the DOM, improving page responsiveness by 20%.
Played a significant role in PHP development, utilizing the Laravel framework and MySQL for backend functionality.
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Education
University at Albany, Bachelor's Degree of Computer Science
2015 – 2017
