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I am a Senior Full-Stack Web & Mobile Engineer with over 10 years of experience, specializing in scalable, AI-enhanced applications across web and mobile platforms. I excel at building robust cross-platform mobile apps using React Native, and developing modern web solutions with React, Next.js, and Angular. I am proficient in JavaScript/TypeScript and Python, leveraging frameworks like Node.js, NestJS, Django, and Flask to deliver clean, modular backend systems. My experience includes designing and integrating RESTful APIs, tRPC, and working with databases such as PostgreSQL, MongoDB, and MySQL. With deep expertise in cloud architecture and deployment on AWS and Google Cloud Platform, I optimize performance, reliability, and cost-efficiency. I am passionate about full-stack AI development, including NLP, recommendation engines, and smart automation using TensorFlow, PyTorch, and cloud-based inference pipelines. I focus strongly on user experience, clean code, and system design best practices, with a proven track record mentoring junior engineers, contributing to team growth, and leading delivery of high-quality, innovative products.…I am a Senior Full-Stack Web & Mobile Engineer with over 10 years of experience, specializing in scalable, AI-enhanced applications across web and mobile platforms. I excel at building robust cross-platform mobile apps using React Native, and developing modern web solutions with React, Next.js, and Angular. I am proficient in JavaScript/TypeScript and Python, leveraging frameworks like Node.js, NestJS, Django, and Flask to deliver clean, modular backend systems. My experience includes designing and integrating RESTful APIs, tRPC, and working with databases such as PostgreSQL, MongoDB, and MySQL. With deep expertise in cloud architecture and deployment on AWS and Google Cloud Platform, I optimize performance, reliability, and cost-efficiency. I am passionate about full-stack AI development, including NLP, recommendation engines, and smart automation using TensorFlow, PyTorch, and cloud-based inference pipelines. I focus strongly on user experience, clean code, and system design best practices, with a proven track record mentoring junior engineers, contributing to team growth, and leading delivery of high-quality, innovative products.

Bao Guyen

Full Stack Developer, Developer, Programmer, +2

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I am a Senior Full-Stack Web & Mobile Engineer with over 10 years of experience, specializing in scalable, AI-enhanced applications across web and mobile platforms. I excel at building robust cross-platform mobile apps using React Native, and developing modern web solutions with React, Next.js, and Angular. I am proficient in JavaScript/TypeScript and Python, leveraging frameworks like Node.js, NestJS, Django, and Flask to deliver clean, modular backend systems. My experience includes designing and integrating RESTful APIs, tRPC, and working with databases such as PostgreSQL, MongoDB, and MySQL. With deep expertise in cloud architecture and deployment on AWS and Google Cloud Platform, I optimize performance, reliability, and cost-efficiency. I am passionate about full-stack AI development, including NLP, recommendation engines, and smart automation using TensorFlow, PyTorch, and cloud-based inference pipelines. I focus strongly on user experience, clean code, and system design best practices, with a proven track record mentoring junior engineers, contributing to team growth, and leading delivery of high-quality, innovative products.…I am a Senior Full-Stack Web & Mobile Engineer with over 10 years of experience, specializing in scalable, AI-enhanced applications across web and mobile platforms. I excel at building robust cross-platform mobile apps using React Native, and developing modern web solutions with React, Next.js, and Angular. I am proficient in JavaScript/TypeScript and Python, leveraging frameworks like Node.js, NestJS, Django, and Flask to deliver clean, modular backend systems. My experience includes designing and integrating RESTful APIs, tRPC, and working with databases such as PostgreSQL, MongoDB, and MySQL. With deep expertise in cloud architecture and deployment on AWS and Google Cloud Platform, I optimize performance, reliability, and cost-efficiency. I am passionate about full-stack AI development, including NLP, recommendation engines, and smart automation using TensorFlow, PyTorch, and cloud-based inference pipelines. I focus strongly on user experience, clean code, and system design best practices, with a proven track record mentoring junior engineers, contributing to team growth, and leading delivery of high-quality, innovative products.

Available to hire

I am a Senior Full-Stack Web & Mobile Engineer with over 10 years of experience, specializing in scalable, AI-enhanced applications across web and mobile platforms. I excel at building robust cross-platform mobile apps using React Native, and developing modern web solutions with React, Next.js, and Angular. I am proficient in JavaScript/TypeScript and Python, leveraging frameworks like Node.js, NestJS, Django, and Flask to deliver clean, modular backend systems. My experience includes designing and integrating RESTful APIs, tRPC, and working with databases such as PostgreSQL, MongoDB, and MySQL.

With deep expertise in cloud architecture and deployment on AWS and Google Cloud Platform, I optimize performance, reliability, and cost-efficiency. I am passionate about full-stack AI development, including NLP, recommendation engines, and smart automation using TensorFlow, PyTorch, and cloud-based inference pipelines. I focus strongly on user experience, clean code, and system design best practices, with a proven track record mentoring junior engineers, contributing to team growth, and leading delivery of high-quality, innovative products.

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Intermediate

Work Experience

Senior Full Stack Developer at Rotations Plus

September 1, 2023 - Present

Engineered dynamic, responsive UI components with Next.js and Zustand for medical rotation platforms, building full-stack features with NestJS, Django, and tRPC to ensure type-safe API communication. Designed and deployed microservices architecture to refactor legacy systems, developed real-time features using WebSockets, built secure scalable APIs for authentication, payments, and scheduling with JWT and OAuth2, led mobile development with React Native and Expo including native modules in Swift and Kotlin, applied NLP for medical terminology parsing, and prototyped full-stack AI features such as smart scheduling and auto-tagging using transformer models. Championed end-to-end testing with Cypress integrated into CI/CD pipelines.

Full Stack Developer at FTI Ticketshop GmbH

August 31, 2023 - September 4, 2025

Developed full-stack web and mobile applications in cybersecurity, telecom, and IoT domains with Flask, React Native, and TypeScript. Extended mobile functionality with Java and Kotlin focusing on biometric authentication and hardware integrations. Engineered token-based auth APIs with JWT and OAuth2, designed scalable RESTful and gRPC APIs for distributed microservices. Utilized AWS services (EC2, S3, DynamoDB, Lambda) for cost-optimized infrastructure, developed AI-based email phishing detection with PyTorch NLP models, leveraged Angular Universal for SSR and performance, implemented robust form validation in Angular, deployed containerized microservices on Azure Kubernetes Service, managed CI/CD pipelines, handled AI model lifecycle with MLflow and DVC, and integrated LLM-based tools for chatbot assistance. Supported agile delivery with Jira and collaborated with cybersecurity engineers on secure coding and threat modelling.

Full Stack Engineer at ASML

May 31, 2020 - September 4, 2025

Worked onsite in the Netherlands developing full-stack web and mobile applications. Specialized in scalable and secure software engineering practices within semiconductor and manufacturing domains, contributing technical expertise and collaboration in a fast-paced environment.

Senior Full Stack Developer at Rotations Plus

September 1, 2023 - Present

Engineered dynamic, responsive UI components with Next.js and Zustand, applying modern UI/UX principles and performance optimizations for complex user flows in medical rotation platforms. Built full-stack features using NestJS, Django, and tRPC for type-safe communication. Designed and deployed microservices architecture by refactoring legacy monoliths into modular services to improve system resilience and scalability. Developed real-time features using WebSockets for mentorship chat and schedule synchronization. Managed backend infrastructure with PostgreSQL and MySQL on Google Cloud SQL including automated backups and database tuning. Created secure, scalable APIs for authentication, payments, and scheduling with JWT, OAuth2, and third-party integrations. Led mobile development using React Native and Expo, with native Swift and Kotlin modules for advanced device features. Applied NLP to parse medical terminology for intelligent search and booking workflows. Prototyped AI features suc

Full Stack Developer at FTI Ticketshop GmbH

August 31, 2023 - September 4, 2025

Developed full-stack web and mobile applications in cybersecurity, telecom, and IoT using Flask, React Native, and TypeScript collaborating with designers to create seamless interfaces. Extended Android app functionality with Java and Kotlin for biometric authentication and hardware integrations. Engineered secure token-based APIs using JWT, OAuth2, and device fingerprinting adhering to cybersecurity best practices. Designed scalable RESTful and gRPC APIs for microservices in multi-device ecosystems. Utilized AWS services (EC2, S3, DynamoDB, Lambda) to build fault-tolerant infrastructure, reducing operational costs by 15%. Developed AI-based email phishing detection features using PyTorch NLP models enhancing threat detection. Leveraged Angular Universal for SSR to improve load and SEO for AI content modules. Built modular interfaces with Angular Material and robust form validation with Angular Reactive Forms. Designed secure REST and GraphQL APIs for AI services including recommendati

Full Stack Engineer at ASML

May 31, 2020 - September 4, 2025

Built full-stack web and mobile applications in cybersecurity, telecom, and IoT domains using Flask, React Native, and TypeScript. Collaborated with designers via Figma to deliver user-friendly interfaces. Enhanced Android apps using Java and Kotlin for biometric authentication and hardware integrations including GPS and sensors. Developed secure token-based authentication and authorization APIs (JWT, OAuth2). Created scalable RESTful and gRPC APIs for distributed microservices. Employed AWS (EC2, S3, DynamoDB, Lambda) to create cost-optimized, fault-tolerant infrastructure. Implemented AI-based NLP models in PyTorch for email phishing detection. Used Angular Universal for server-side rendering to enhance performance and SEO. Developed modular UI components with Angular Material. Designed REST and GraphQL APIs supporting AI-powered recommendation and personalization services. Integrated OpenAI and spaCy for smart search and conversational interfaces. Managed CI/CD pipelines and contain