Joshua S.

I build SaaS products, backend APIs, and AI features with React, TypeScript, Node.js, and Python. With 15+ years of development experience, I can take a product from an early idea through launch, or improve an existing application that needs reliable engineering. I also build and maintain my own products, so I understand the work beyond a demo: billing, integrations, data handling, deployment, and ongoing support. VendBook: I independently developed and published an iPhone app for card show vendors. It helps users record purchases, sales, and trades, identify cards from photos, check market prices, track costs, and export records. The product includes offline access and synchronization, subscription billing, and a Firebase backend. AutoQuant: I own and develop an AI trading research platform that turns plain-English strategies into Python code for testing and deployment. I built the Python/FastAPI backend and React/TypeScript desktop interface, integrated multiple LLM providers through LiteLLM, and implemented retries, fallback handling, restricted code execution, and statistical validation. It also includes Stripe billing and Alpaca integration. My production experience includes healthcare, financial research, and education software. At PrivCo, I built Elasticsearch search, analytics, and ETL pipelines for private-company research. At Navigate360, I developed real-time learning features with AWS AppSync and GraphQL, and worked on Docker, AWS EKS, and CI/CD deployments. What you can hire me for: • SaaS MVPs and product features, from database and API to frontend • AI/LLM integrations, agent workflows, and Python automation • React and TypeScript interfaces, dashboards, and mobile applications • Node.js/NestJS and Python/FastAPI backend development • Stripe billing, OAuth/SSO, and third-party API integrations • Elasticsearch, data pipelines, and database performance • Debugging, meaningful tests, refactoring, and production readiness Core tools: React, TypeScript, Node.js, NestJS, Python, FastAPI, PHP, MySQL, PostgreSQL, Elasticsearch, Firebase, GraphQL, AWS, Docker, and GitHub Actions. I work with clear scope, practical milestones, and straightforward communication. I'm based in Pennsylvania and available for up to 40 hours per week. Send me your current product, the problem you're trying to solve, and what you want to ship next.