Nikola S.

⭐⭐⭐⭐⭐ Senior Expert AI/ML Engineer | Full-Stack SaaS Developer | AI-Assisted Product Builder I build production-ready SaaS products, web applications, and AI systems that ship—and continue to perform after launch. As a senior engineer, I take ownership from architecture and technical decisions through deployment, integrations, and ongoing improvements. Clients often bring me stalled builds, unreliable AI-assisted prototypes, or AI features that never moved beyond a demo. I assess what is worth keeping, fix or rebuild what is not, and deliver a stable product focused on real business outcomes. What I Deliver SaaS & web platforms Multi-tenant applications, subscription billing, authentication, role-based access, admin dashboards, and complete MVP-to-production builds. Production AI features RAG systems, OpenAI, Claude, and Gemini integrations, AI agents, chatbots, automated workflows, vector search, and LLM pipelines designed for real users—not just demos. AI-assisted app rescue & migration Senior-level audits, fixes, and scalable rebuilds for Lovable, Bolt.new, Cursor, Replit, and similar AI-assisted projects that are incomplete, unreliable, or difficult to maintain. Backend & integrations Supabase (Auth, RLS, Edge Functions, PostgreSQL), Node.js, .NET, REST and GraphQL APIs, Stripe, HubSpot, and third-party integrations. Business automation n8n and Make workflows that reduce manual work and connect the tools your team already uses. Stack Frontend: React, Next.js, Vue, Nuxt, TypeScript Backend: Supabase, Node.js, .NET, PostgreSQL AI/LLM: OpenAI, Claude, Gemini, RAG, LangChain, vector search AI-assisted development: Lovable, Cursor, Claude Code DevOps: Docker, Vercel, CI/CD, GitHub Actions Automation: n8n, Make I use AI-assisted tools to work efficiently, but every deliverable is reviewed, structured, and built for reliability, maintainability, and growth. If you need a senior engineer to turn an idea, prototype, or existing product into a dependable production system, send me an invite and tell me what you are building. I’ll scope it honestly and reply within 24 hours.