About

I am David Lang, a Senior Full Stack AI Engineer based in Jacksonville, FL. With 8+ years of experience, I specialize in building scalable web applications, cloud platforms, and AI-powered products using Python, Node.js, Go, C#, React, TypeScript, AWS, Azure, and LLM technologies.

My work spans developing production systems, AI integrations, and reliable solutions across diverse industries. I have delivered features that serve thousands of daily users while maintaining high performance and reliability.

Technical Expertise

Languages & Core Technologies

Languages: JavaScript, TypeScript, Python, C#, Go, Java, SQL
Frontend: React, Next.js, Vue.js, Tailwind CSS, React Native, Expo
Backend: FastAPI, Django, NestJS, Express, ASP.NET Core, Spring Boot, REST APIs, GraphQL, WebSockets

Architecture & Systems

Architecture: Microservices, Event-Driven Architecture, Distributed Systems, Domain-Driven Design, API Design
Databases: PostgreSQL, MySQL, MongoDB, Redis, Supabase, Prisma ORM, Drizzle ORM

Cloud & Infrastructure

AWS: ECS, Lambda, API Gateway, S3, SQS, Step Functions, CloudFormation, SageMaker, Bedrock
Azure: AKS, Azure Functions, Azure SQL, Service Bus, Event Grid, Azure OpenAI
GCP: GKE, Pub/Sub
DevOps: Docker, Kubernetes, Terraform, GitHub Actions, Jenkins, CI/CD

AI & Machine Learning

AI & LLM: OpenAI, Anthropic, LangChain, LlamaIndex, Model Context Protocol (MCP), RAG, Prompt Engineering, AI SDKs
AI Development Tools: Claude Code, Cursor, GitHub Copilot

Automation & Integration

n8n, Zapier, Stripe, SendGrid, Twilio, Social Media APIs, GHL, Salesforce

Professional Experience

Pixellot — Senior Full Stack AI Engineer (Apr 2023 - Apr 2026)

Built and maintained production AI-powered SaaS applications supporting 15K+ daily users. Developed Python (FastAPI) and NestJS microservices powering AI workflows, REST APIs, and business logic. Integrated OpenAI and Anthropic models using LangChain, LlamaIndex, and MCP to build RAG pipelines, AI agents, and workflow automation, reducing manual processing time by 40%. Developed Voice AI Agents and optimized PostgreSQL schemas and Redis caching, improving query performance by 30%.

SwingVision — Full Stack Engineer (Apr 2020 - Mar 2023)

Developed full-stack product features for customer-facing applications and internal business platforms. Built responsive web applications using React, Next.js, TypeScript, and Tailwind CSS. Developed Python (FastAPI) and Go microservices supporting REST APIs, GraphQL, background jobs, and real-time communication. Integrated Stripe, Twilio, SendGrid, Salesforce, and GHL to automate payments, communications, and CRM workflows.

FIS — Full Stack Engineer (Jun 2018 - Mar 2020)

Developed enterprise applications using C#, ASP.NET Core, React, and Next.js to support internal business workflows and customer-facing systems. Built REST APIs and backend services using .NET technologies. Designed SQL Server data models and developed data processing workflows using Azure Data Factory and Azure Data Lake.

Education

Bachelor’s Degree in Computer and Information Sciences
University of North Florida (2015 - 2018)

Get in Touch

If you’re looking for an experienced engineer to tackle complex technical challenges, I’d love to connect: