Ziad H.

I build and ship SaaS platforms end to end. Architecture, backend, frontend, AI layer, deployment. Solo, and to production, not to a demo. Most of what I do lives in the same place: complex data, third-party APIs that fight back, an AI layer that has to be correct rather than impressive, and a real product on top that people use every day. "He consistently completes tasks on time and often goes above and beyond to ensure quality and accuracy. His proactive nature and attention to detail make them a trusted asset. Worked on several projects with this Freelancer and will continue on upcoming future projects." — Long-term client | SaaS & AI Architecture ◼ WHAT I BUILD ▸ FULL SAAS PLATFORMS Multi-tenant architecture, OAuth, async job systems, billing, the whole product. Not a prototype handed off at 60%. ▸ ANALYTICS & FORECASTING Time-series models, data pipelines, and dashboards where the number is explainable enough for a non-technical operator to act on it. ▸ ADVANCED AI TOOLING LLM pipelines with structural guarantees: schema-enforced outputs, prompt-level contracts, graceful degradation when the model returns nonsense, and spend metering that survives concurrent workers. ▸ ADTECH & ECOMMERCE I've engineered and shipped SaaS across the Google Ads, Merchant Center, Shopping and Shopify ecosystem. Campaign generation and deployment against live accounts, feed segmentation, demand forecasting. If your product touches ads or commerce infrastructure, I've already been through that door. ◼ HOW I BUILD IT Everything I ship has been in production with real money moving through it, so I build for the failure cases first. - Idempotent writes, so a retry doesn't duplicate a live resource - Batch operations that fall back to per-item when the API rejects one row - Atomic accounting that doesn't lose updates under concurrency - Recovery sweeps for jobs orphaned by a worker crash None of it is greenfield theory. It's all a fix for something that broke once. ◼ STACK Backend Python · FastAPI · Django · Celery · Node.js · Express · Pydantic · SQLAlchemy / SQLModel · Alembic · REST · WebSockets Frontend Next.js · React 19 · TypeScript · TanStack Query · Tailwind · shadcn/ui · Vite · Chart.js · D3 AI & LLM Gemini · OpenAI · Anthropic Claude · LangChain · LlamaIndex · RAG · Embeddings · Vector DBs (Pinecone, Weaviate, pgvector) · Function calling & structured outputs · Fine-tuning · Whisper · Open-source models (Llama, Mistral, Ollama, vLLM) Data PostgreSQL · MongoDB · Redis · Pandas / NumPy · Prophet Integrations Google Ads API · Google Merchant Center Content API · Shopify API · Stripe · Slack API · Google OAuth / Sign-In · OAuth 2.0 Infrastructure Docker · Docker Compose · AWS · Nginx · Linux / VPS administration · GitHub Actions (CI/CD) · Sentry · Flower Testing Pytest · Playwright ◼ HOW I WORK Solo and direct. No agency layer, no outsourcing, no handoff to a junior. You own the code, 100%. 100% Job Success. 100% client retention on long-term contracts, including one running continuously since 2022. Never rated below 5 stars in four years. I take on work I can actually finish. Send me the problem, not the spec, and if I'm not the right fit I'll tell you. If it looks like a match, let's get on a call.