About Me

I'm Paweł Wiszniewski, a Senior Full-Stack Engineer & AI Architect based in Warsaw, Poland. I build high-performance web systems, AI-powered solutions, and scalable SaaS products.

Background

With 8+ years of experience in full-stack development, I've worked with startups and enterprises on everything from greenfield SaaS architectures to complex AI integrations. My focus is on building systems that scale—technically, architecturally, and commercially.

I specialize in Next.js, React, Node.js, and cloud infrastructure on AWS/GCP. More recently, I've dove deep into LLM engineering, agentic systems, and Generative Engine Optimization (GEO).

My Approach

  • 01Understand the Goal - Before writing code, I dive deep into your business model, users, and metrics that matter.
  • 02Architecture First - I design for scale. Every decision considers growth, performance, and maintainability.
  • 03User-Centric - Fast load times, intuitive UX, and conversion-optimized flows aren't nice-to-haves—they're table stakes.
  • 04SEO as Default - Every system I build is optimized for search. Schema markup, Core Web Vitals, technical SEO—built in from day one.
  • 05Delivery & Ownership - I don't hand off projects; I ensure they succeed in production. Monitoring, optimization, and support included.

Tech Stack

Frontend

  • Next.js 16+
  • React 19
  • TypeScript
  • Tailwind CSS
  • Three.js / WebGL

Backend

  • Node.js / Express
  • Python (FastAPI)
  • GraphQL / REST
  • Serverless (Vercel)

AI & Data

  • GPT-4 / Gemini
  • LLM Fine-tuning
  • RAG Systems
  • Vector Databases

Cloud & DevOps

  • AWS / GCP
  • Terraform / IaC
  • CI/CD (GitHub Actions)

Databases

  • PostgreSQL
  • MongoDB
  • Redis
  • Supabase

Tools & Services

  • Git / GitHub
  • Figma
  • SEO Tools (Ahrefs, SEMrush)

Philosophy

"Great software isn't just fast or scalable—it's invisible. It solves problems so elegantly that users forget they're using technology. Every line of code should earn its place."

I believe in simplicity over complexity, data-driven decisions over opinions, and long-term partnerships over one-off projects. If you're building something ambitious, let's talk.