Jakub Mikulica

Architected and developed a scalable booking system using Next.js (App Router) and Nest.js, enabling full appointment lifecycle management with real-time feedback. Improved codebase maintainability by structuring the project into feature-first folders and reusable components. Upgraded the Next.js framework and integrated authentication with NextAuth.js and Supabase with role-based access control. Designed backend APIs with Prisma ORM connected to PostgreSQL, implemented secure payment systems (Stripe, PayPal, Apple Pay), and used RabbitMQ for real-time messaging. Synced bookings with Google Calendar and managed user content on AWS S3. Deployed apps with Docker, Nginx, GitHub Actions, and Vercel for CI/CD and optimized app rendering by balancing SSR and CSR. Enhanced search capabilities by embedding Algolia AI search and improved system performance through microservices architecture with Redis and Nginx. Developed dashboards and pipelines for local Algolia management and handled million

Built a financial statistics platform with Django backend and React.js frontend featuring real-time data visualization. Led frontend architecture development from scratch and integrated multiple payment gateways including Stripe and PayPal with webhook management. Developed a Python-based AI chatbot leveraging a custom LLM for product description generation and service team assistance. Analyzed financial data and transaction histories using statistical models in Django. Automated data scraping and mining processes with Python and managed configurations with MongoDB hosted on Ubuntu. Optimized database queries and implemented Redis caching for performance gains. Managed domain routing and SSL configurations with Nginx and Kubernetes for multi-environment deployments.

Developed a data mining pipeline using Python libraries for scraping and scheduled execution on GCP Cloud Run. Analyzed data with NumPy and Pandas to inform strategic product planning and built a dynamic React.js dashboard with advanced visualizations including 2D/3D charts and Google Maps integration. Supported export functionality for datasets in multiple formats, automated PDF report generation via Node.js and Puppeteer, and introduced unit testing with Jest to maintain high code quality. Modularized services into containerized microservices using Docker and Kubernetes, achieving significant API performance improvements. Automated reporting synchronization with Google Sheets and built scraper bots with anti-captcha and proxy rotation features. Deployed backend services on AWS and GCP. Created a visual query tool with Supabase functions improving reporting efficiency for business teams.