Greg D.

Lead Dev who built systems increasing a company's revenue 400%. Expert in Python, JavaScript, Google Cloud, AWS, AI/ML (OpenAI Codex, LangChain, Replit Agent 3), and full-stack development. 15+ years hands-on coding for Fortune 500 clients and startups. I write (with my coding agent) production code that scales to millions of users and solves complex business problems. What I Build AI/ML Applications: Hands-on development (coding agents: Codex, Claude Code, Replit Agent 3) with LlamaIndex, LangChain, Vertex, OpenAI and Anthropic APIs. I've built multi-agent orchestration systems, LLM-powered OCR applications, AI chatbots, and custom ML classifiers with complete training pipelines. Cloud-Native Systems: Deep Google Cloud and AWS implementation experience, 20+ services. I write Terraform to make your infrastructure maintainable and build scalable, distributed architectures. Complex Business Logic: Specialized in implementing sophisticated systems for financial services—underwriting rules, regulatory compliance, legal workflows, statistical models, and high-stakes transactional processing. Development Experience Lead Developer | Jobble.com (2018-2023) Sole developer who built job feed system increasing revenue 400% in one year Coded complete platform scaling from basic EC2 setup to distributed AWS architecture serving millions Implemented email system processing millions of job alerts using DynamoDB/ECS/SES Built and deployed custom ML job classification model with training infrastructure Wrote all initial code before breaking monolith into microservices for team distribution Lead Developer | Fashion Tech Startup (2016-2017) Developed AI-powered search engine for fashion runway photographs Coded image classification system and trained ML model on 5,000+ images Built complete backend and API infrastructure CTO & Lead Developer | VoyHoy Travel (2014-2015) Sole developer building entire travel booking platform for Latin American market Coded web scraping architecture, payment integrations, and transactional purchase system Integrated multiple travel company APIs Software Developer | Accenture Financial Services Developed enterprise systems for JP Morgan, State Farm, American General Coded complex financial calculations, regulatory compliance logic, and data processing Technical Skills Languages: Python (primary), Java, Groovy, Golang, JavaScript/CSS3 AI/ML: LlamaIndex, LangChain, Hugging Face Transformers, AWS Bedrock, SageMaker, RLHF, Fine-tuning, Custom Model Training AWS Services: Lambda, ECS, Fargate, DynamoDB, RDS Aurora, Redshift, S3, Kinesis, Glue, Athena, SageMaker, Step Functions, API Gateway Data & Analytics: Spark, Statistical Programming, Regression Models, Data Visualization DevOps: Terraform, CloudFormation, CI/CD, Infrastructure as Code Specialties: Complex business logic, financial systems, pixel-perfect UI implementation, iOS development Why Hire Me I'm a hands-on developer who writes clean, scalable code for complex problems. Whether it's building AI applications with cutting-edge tools or implementing intricate business logic for regulated industries, I deliver production-ready systems that handle real-world scale. 15+ years of experience means I can architect solutions, but I'm most comfortable with my hands on the keyboard writing code. Need a lead developer who can build your entire system or join your team? Let's connect.