martynahopek

Designed and implemented a system architecture from scratch used across multiple Shift4 products Developed a merchant payment management dashboard used for monitoring and processing transactions Implemented payment integrations including payment gateways, alternative payment methods, and cryptocurrency payments Built scalable, responsive user interfaces using React, Next.js, Redux, Tailwind CSS, SCSS, and Material UI Contributed to automated testing using Cypress Collaborated with backend services built with Java 17 and integrated solutions deployed on AWS Served as Deputy Team Leader, supporting sprint planning, task prioritization, and coordination of the development team Facilitated communication between developers and product stakeholders Mentored team members and supported the delivery of production-ready features

Contributed to advertising systems used across newspapers of the Scandinavian Schibsted Group Developed a platform enabling merchants to create and manage custom advertisements Built and maintained front-end features using React, TypeScript, Redux, and styled-components Implemented automated testing using Jest and Cypress Worked with Node.js services supporting advertising workflows Led development tasks as Team Leader, coordinating the work of the engineering team and delegating responsibilities Collaborated closely with product teams to deliver advertising solutions Mentored interns and onboarded new developers Organized internal workshops and supported knowledge sharing within the team Tech stack: JavaScript, TypeScript, React, Redux, CSS, Sass, styled-components, Jest, Cypress, Node.js

Contributed to the development of Statscore Live, a complex real-time application for football fans – https://statscore.live Developed front-end components and implemented application logic supporting live sports data Wrote database queries and implemented GraphQL integrations Created unit and component tests to ensure application reliability Built responsive and user-friendly interfaces using React, Next.js, Redux, Tailwind CSS, and Material UI Tech stack: React, Next.js, Redux, GraphQL, Tailwind CSS, Material UI, Jest

Developed highly responsive, web-based user interfaces Designed flexible and well-structured front-end architecture and supporting APIs Built responsive applications using HTML, CSS, Sass, styled-components, JavaScript, TypeScript, React (Hooks), and Redux Contributed to the development of a CMS platform for newspaper editors Collaborated with designers and developers to implement and improve front-end features