Marcel Bąk

Led the development of scalable eCommerce and AI-enabled platforms, designed microservice-based backend architectures using C#/.NET Core, Node.js, and TypeScript; built Angular-based dashboards; integrated AI capabilities via OpenAI APIs; architected cloud-native infrastructure with Docker, Kubernetes, Terraform on AWS; optimized API performance and database queries; expanded CI/CD pipelines with GitHub Actions; implemented secure authentication (OAuth2, JWT) and RBAC; mentored junior engineers; contributed to healthcare workflow automation.

Developed secure payment platform features, backend APIs in C#/.NET and Node.js for payment orchestration, subscription billing, and reconciliation; implemented Angular frontend to improve merchant usability; strengthened authentication flows, fraud prevention, and PCI-conscious practices; improved reliability via automated testing and cloud-based pipelines; optimized SQL queries for financial reporting; supported legacy service modernization to microservices.

Contributed to eCommerce web applications and client-facing digital platforms; built frontend features with Angular and JavaScript while supporting backend integrations with C#/.NET services and REST APIs; assisted in product catalog management, order workflows, and customer-facing web functionality; collaborated with senior engineers on testing, deployment, and data-driven analytics initiatives.