Marcin P.

I help businesses build, automate, and scale software products using modern web technologies, AI, and workflow automation. My focus is not on implementing technology for its own sake. Instead, I develop practical solutions that solve real business problems, improve operations, and reduce manual work. I work across the entire product lifecycle — from backend architecture and APIs to user interfaces, integrations, and AI-powered automation. Typical business problems I solve: • missed customer inquiries • slow response times • repetitive administrative tasks • disconnected communication channels • inefficient lead handling • manual data entry and follow-ups • fragmented internal systems • lack of automation between business tools I design and develop custom software solutions, SaaS applications, AI-powered workflows, and business automation systems. My experience includes: ✓ Full-stack web application development ✓ SaaS MVP development and maintenance ✓ API development and integrations ✓ AI agents and automation workflows ✓ CRM and customer communication systems ✓ Lead qualification and sales automation ✓ Appointment and booking systems ✓ Internal business tools and dashboards ✓ Workflow optimization and process automation I work comfortably across both frontend and backend development, helping businesses ship products, improve existing systems, and automate operations. Backend & APIs • Node.js • TypeScript • Express.js • REST APIs • WebSockets • GraphQL • API integrations • Webhooks Frontend • React • Next.js • JavaScript • HTML/CSS Databases • PostgreSQL • Supabase • Redis • RabbitMQ AI & Automation • n8n • OpenAI API • AI Agents • LangChain • LangGraph • Prompt Engineering • Workflow Automation • CRM integrations (Monday, HubSpot, Salesforce, QuickBooks, etc) • Google Workspace, Microsoft 365 • WhatsApp / Telegram / Slack • AirTable DevOps & Cloud • Docker • Docker Compose • Kubernetes • Terraform • Linux • Nginx • CI/CD • GitHub Actions • Reverse Proxies • VPS Administration Infrastructure & Deployment • Railway • Hetzner • AWS • GCP • Monitoring & Logging My approach is simple: understand the business first, choose the right technology second, and deliver solutions that provide measurable value. Whether you need a SaaS product, backend APIs, AI automation, CRM integration, custom integrations, or ongoing development support, I can help turn ideas and repetitive processes into reliable software solutions.