Ignas Kubilius

Led the design and implementation of a customer-facing financial dashboard using React and Next.js, delivering real-time data visualization and improving user engagement and retention. Built RESTful APIs with Python (Django, FastAPI) and ensured secure, high-performance communication between frontend and backend. Migrated to a microservices architecture to enhance scalability and availability. Collaborated with data science teams to integrate ML-based fraud detection, reducing fraudulent transactions. Optimized AWS infrastructure (EC2, Lambda, S3, RDS) to cut costs by ~40%. Implemented CI/CD pipelines with GitHub Actions and Jenkins, achieving faster deployments. Mentored junior developers and explored blockchain-based transaction verification to boost security.

Developed a secure payment gateway enabling users to buy Bitcoin with multiple payment methods, boosting transaction volume by 40%. Built backend services with FastAPI and Django, reducing processing times and improving reliability. Implemented real-time transaction monitoring using WebSockets with a responsive frontend. Established automated CI/CD with CircleCI and AWS-based cloud infrastructure, increasing uptime and deployment efficiency. Led end-to-end testing initiatives with Jest and Cypress to achieve high test coverage and reduce production issues. Integrated React Native for mobile support to improve performance and stability.

Designed and developed an integrated shopping cart with real-time order tracking using React.js and Redux, significantly boosting conversion rates. Implemented responsive UI/UX improvements, leading to higher mobile traffic and satisfaction. Built microservices for inventory and order management, improving order fulfillment times. Collaborated on UI/UX with Figma and integrated real-time error tracking with Sentry to enhance reliability. Optimized backend services with FastAPI to handle peak traffic, and led a mobile app initiative using React Native to improve performance.