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I am a Senior Full Stack Engineer with over 10 years of experience shipping scalable web applications across fintech, proptech, gaming, and data-centric domains. My strength lies in building robust frontends with React and powerful Python backends using Django and FastAPI, while designing RESTful and asynchronous APIs, microservices, and cloud-native architectures. I focus on performance, security, and maintainability—delivering secure, containerized apps on AWS and PostgreSQL, mentoring teammates, and architecting systems that balance development velocity with reliability. I enjoy collaborating with cross-functional teams to solve complex problems and make technology accessible to users with diverse needs.…I am a Senior Full Stack Engineer with over 10 years of experience shipping scalable web applications across fintech, proptech, gaming, and data-centric domains. My strength lies in building robust frontends with React and powerful Python backends using Django and FastAPI, while designing RESTful and asynchronous APIs, microservices, and cloud-native architectures. I focus on performance, security, and maintainability—delivering secure, containerized apps on AWS and PostgreSQL, mentoring teammates, and architecting systems that balance development velocity with reliability. I enjoy collaborating with cross-functional teams to solve complex problems and make technology accessible to users with diverse needs.

David Lynn

Full Stack Developer, Web Developer, Programmer, +5

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I am a Senior Full Stack Engineer with over 10 years of experience shipping scalable web applications across fintech, proptech, gaming, and data-centric domains. My strength lies in building robust frontends with React and powerful Python backends using Django and FastAPI, while designing RESTful and asynchronous APIs, microservices, and cloud-native architectures. I focus on performance, security, and maintainability—delivering secure, containerized apps on AWS and PostgreSQL, mentoring teammates, and architecting systems that balance development velocity with reliability. I enjoy collaborating with cross-functional teams to solve complex problems and make technology accessible to users with diverse needs.…I am a Senior Full Stack Engineer with over 10 years of experience shipping scalable web applications across fintech, proptech, gaming, and data-centric domains. My strength lies in building robust frontends with React and powerful Python backends using Django and FastAPI, while designing RESTful and asynchronous APIs, microservices, and cloud-native architectures. I focus on performance, security, and maintainability—delivering secure, containerized apps on AWS and PostgreSQL, mentoring teammates, and architecting systems that balance development velocity with reliability. I enjoy collaborating with cross-functional teams to solve complex problems and make technology accessible to users with diverse needs.

Available to hire

I am a Senior Full Stack Engineer with over 10 years of experience shipping scalable web applications across fintech, proptech, gaming, and data-centric domains. My strength lies in building robust frontends with React and powerful Python backends using Django and FastAPI, while designing RESTful and asynchronous APIs, microservices, and cloud-native architectures.

I focus on performance, security, and maintainability—delivering secure, containerized apps on AWS and PostgreSQL, mentoring teammates, and architecting systems that balance development velocity with reliability. I enjoy collaborating with cross-functional teams to solve complex problems and make technology accessible to users with diverse needs.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Language

English

Fluent

German

Intermediate

Chinese

Fluent

Work Experience

Senior Full Stack Engineer at Fractual

August 1, 2025 - October 16, 2025

Led the development of a HIPAA- & GDPR-compliant telemedicine platform, improving doctor–patient communication, accessibility, and AI-assisted health management. Built secure, multilingual features with WebRTC-based video/audio consults, encrypted chat, and appointment scheduling; integrated Laravel-based backend with a React frontend; optimized AI-driven interactions for sub-300ms latency; implemented secure payment flows with Stripe; established RBAC and end-to-end encryption; aligned with interoperability standards (FHIR, HL7, DICOM); delivered encrypted file-sharing pipelines and configurable dashboards; contributed to onboarding improvements and reduced support tickets.

Senior Full Stack Engineer at Fractual

August 1, 2025 - September 17, 2025

Led the development of a full-featured React Native mobile app and a companion web portal with multi-role access and real-time collaboration for service teams. Built a robust NestJS backend in TypeScript with scalable microservices, designed and optimized PostgreSQL schemas for patient tracking, tasks, and outcomes, and implemented real-time communication via Socket.IO. Delivered secure authentication with AWS Cognito (multi-role logins, token refresh, session handling), and secure document storage with AWS S3 (signed URLs, access control). Integrated AWS SNS/SES for notifications and built an admin analytics dashboard using React + Zustand to monitor activity, case completion, and compliance metrics. Implemented AI-driven task prioritization and risk classification via external APIs, established a CI/CD pipeline with GitHub Actions and Docker, ensured GDPR compliance, and delivered a responsive UI with DaisyUI components. Reduced support tickets through detailed audit logging and a se

Full Stack Engineer at Porsche Informatik GmbH

February 1, 2024 - October 16, 2025

Led end-to-end development of an AI-powered web/mobile platform enabling families to create personalized illustrated bedtime stories, integrating GPT-4 APIs for real-time content generation. Architected a scalable, cloud-native Python backend (FastAPI + Django ORM) on AWS Lambda, DynamoDB, and Step Functions; designed offline-first architecture with intelligent background sync; implemented secure subscriptions via Stripe (web) and RevenueCat (mobile); geolocation personalization using Google Maps; established CI/CD pipelines; improved performance and observability with Sentry, CloudWatch, and Firebase Performance Monitoring; optimized React Native UI and multi-language narration; championed Agile practices.

Full Stack Engineer at Porsche Informatik GmbH

February 1, 2024 - September 17, 2025

Designed and deployed a mobile-first React Native app for AI-powered interactive storytelling, integrating a NestJS backend with AWS Lambda. Implemented scalable, event-driven workflows using AWS Step Functions for asynchronous media generation tasks. Built and secured REST APIs and WebSockets (validation, pagination, rate limiting) with NestJS, and modeled PostgreSQL data for content personalization and multilingual storage. Implemented Cognito-based authentication with role control, and managed image/audio storage on AWS S3 with lifecycle rules. Connected SES/SNS for verification and alerts. Set up CI/CD with GitHub Actions, Docker, and Azure DevOps across multiple release channels. Developed AI prompt pipelines with GPT-4 for safe content generation and robust fallback handling. Created admin and parental dashboards with React and Zustand, improved crash rates via instrumentation (Sentry, CloudWatch, Firebase Performance), and delivered offline-first capabilities.

Senior Full Stack Developer at Toptal

December 1, 2022 - October 16, 2025

Architected and implemented an end-to-end inventory management system for an enterprise e-commerce platform, enabling real-time stock tracking, multi-warehouse SKU reconciliation, and low-stock alerts. Migrated from a monolithic system to a microservices-based backend (FastAPI + Django ORM); built an event-driven inventory synchronization pipeline using AWS SNS/SQS; designed RESTful and asynchronous APIs, and a real-time dashboard for operations; implemented RFID/barcode scanning in mobile interfaces; established RBAC and used PostgreSQL with optimized indexing; set up CI/CD pipelines with Azure DevOps.

Senior Full Stack Developer at Toptal

December 1, 2022 - September 17, 2025

Migrated a legacy monolith into modular NestJS microservices covering inventory, order, and logistics domains. Built highly available REST and Socket.IO-based APIs with auto-scaling via Docker and Kubernetes. Created a PostgreSQL-backed event pipeline for warehouse operations and implemented a real-time web dashboard using React + Zustand with role-based access. Implemented robust task scheduling with granular filters and integrated AWS SNS/SQS for decoupled communications. Developed offline-first stock reconciliation with delta sync and caching for mobile devices, added comprehensive audit trails, and mentored a 10-person full-stack team. Aligned architecture with operational KPIs and automated CI/CD workflows via Azure DevOps.

Full Stack Engineer at Redox Interactive

February 1, 2020 - October 16, 2025

Developed a high-performance shopping platform with a mobile-first React.js/Next.js UI (SSR for SEO). Built real-time inventory and checkout workflows with FastAPI, AWS Lambda, DynamoDB, and PostgreSQL; integrated Stripe payments and invoicing; created a modular order-management engine exposed via REST/Django ORM; implemented analytics pipelines and performance improvements with lazy loading and Next.js optimizations; migrated global state to React Query; implemented secure authentication with JWT/OAuth2/MFA; expanded test coverage.

Full Stack Engineer at Redox Interactive

February 1, 2020 - September 17, 2025

Created a high-performance shopping platform with a mobile-first React.js/Next.js UI using SSR for improved SEO and faster load times. Implemented real-time inventory and checkout flows with Node.js/Express, integrating AWS Lambda, DynamoDB, and PostgreSQL for accurate stock visibility and safe concurrency under high traffic. Built a modular order management engine with cart persistence, discounts, and purchase history exposed via REST APIs. Implemented analytics using Google Analytics, Mixpanel, and custom pipelines. Optimized frontend with Next.js optimizations, transitioned global state management to React Query/ Zustand, and ensured secure auth with JWT/OAuth2/MFA. Expanded test coverage with Jest, RTL, MSW, and Postman; introduced CI/CD via Azure DevOps and improved deployment confidence.

Junior Full Stack Developer at SO technology

January 1, 2019 - October 16, 2025

Supported internal tooling and mobile dashboards for logistics, product, and finance teams. Built high-visibility internal SPAs with React.js, Vanilla JS, and jQuery; developed RESTful APIs using Laravel (PHP 7) with PostgreSQL; created mobile dashboards with React Native (Expo) including barcode scanning, geolocation, push notifications.

Junior Full Stack Developer at SO technology

January 1, 2019 - September 17, 2025

Supported internal tooling and mobile dashboards for logistics, product, and finance teams. Built high-visibility SPAs with React.js, Vanilla JS, and jQuery; developed REST APIs with Laravel (PHP 7) and PostgreSQL. Built mobile-first dashboards (React Native) with barcode scanning, push notifications, and geolocation features, enabling real-time logistics workflows. Ensured data integrity and performance across dashboards and dashboards maintenance.