Artur Zawadka

Led development of a large-scale e-commerce platform using Node.js, Express.js, MongoDB and ReactJS with Redux and Redux-Saga. Designed and optimized REST APIs for a microservices architecture, implemented Redis caching, and integrated RabbitMQ for real-time order processing and notifications. Collaborated in Agile sprints, performed code reviews and mentored junior developers on React, Redux, and Node.js. Translated wireframes into reusable UI components with Styled Components, TailwindCSS, and Material UI, and improved performance, reducing load times and API latency. Implemented unit/integration tests with Jest and Mocha to achieve high coverage and support CI/CD with GitLab.

Led Full Stack delivery for an education services client, building a responsive React web application and Node.js APIs for tutor discovery, bookings, and profile workflows. Designed secure authentication and profile management using OAuth2, JWT, and role-based permissions, supporting separate student and tutor experiences with protected scheduling and messaging actions. Implemented booking, confirmation, rescheduling, and cancellation logic with timezone-aware rules, reducing scheduling conflicts by 40% across multi-region sessions coordinated through integrated calendar providers. Built tutor profile management tools covering subjects, availability windows, pricing metadata, and session preferences, enabling non-technical administrators to support marketplace onboarding and profile quality reviews. Integrated notification pipelines for reminders and session updates using email APIs, webhooks, and queue-based processing, improving successful session attendance rates by 25% during MVP r

Developed scalable web applications with Node.js, Express.js, MongoDB and ReactJS, implementing Redux and Redux-Saga for state management and asynchronous workflows. Built and optimized RESTful APIs for millions of users, using Redis caching and RabbitMQ messaging for performance and reliability. Designed server-side queries in PostgreSQL and MongoDB, achieving ~30% query improvement. Implemented microservices and containerized deployments with Docker and Kubernetes. Created reusable UI components with Styled Components, Material UI, and TailwindCSS and supported Agile practices, code reviews, and mentoring. Contributed to ELK-based observability, improving issue detection times, and supported GitLab-based CI/CD.