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Erwin Majewski

@erwinmajewski

Message

I build scalable React and Angular web applications for healthcare, GIS, and analytics.

Poland

Message

I've built healthcare web services for Centrum e-Zdrowia used by 4,000+ clinicians daily, delivering scalable Angular applications, accessible WCAG improvements, and reusable UI components from Figma designs.

Previously, at All For One Poland and Poznan Supercomputing and Networking Center, I developed React applications, PowerBI-like analytics tooling, GIS map features, and high-performance components. I combine React, Angular, TypeScript, state management, NestJS, Docker, and practical UI/UX implementation to turn requirements into reliable web products.

Experience

Work history, roles, and key accomplishments

Frontend Developer

Centrum e-Zdrowia

Jan 2025 - Aug 2026 (1 year 7 months)

Built scalable healthcare applications in TypeScript and Angular, implementing UIs from Figma mockups and expanding an internal component library. Developed Ministry of Health web services used by 4,000+ clinicians daily and maintained Jest unit tests with coverage above 80%.

TypeScript Angular NgRX RxJS Angular Signals Jest Responsive Design Figma TanStack Table styled components Bootstrap Leaflet.Js Git Jira Confluence Jenkins Storybook Docker Microsoft Copilot

Frontend Developer

All For One Poland

Jan 2022 - Dec 2024 (2 years 11 months)

Implemented user interfaces and business logic using React and Redux Toolkit, ensuring UI/UX alignment with Adobe XD mockups. Co-developed a custom tool similar to PowerBI, reducing company costs, and built reusable components including a custom Gantt chart adopted in two additional projects.

React Redux toolkit JavaScript TypeScript HTML5 styled components Flexbox Grid Axios NestJS TypeORM Docker PostgreSQL PgAdmin Adobe XD Storybook Confluence Agile Scrum ChatGpt

Junior Software Developer

Poznan Supercomputing and Networking Center

Jan 2019 - Dec 2021 (2 years 11 months)

Developed a specialized React web application for researchers, scientists, and students, implementing GIS features to visualize spatial data on maps using Leaflet.js. Integrated map plugins and enhanced performance with Pixi.js, increasing rendered elements by 90%, and built administrative sections for user management and statistics.

React JavaScript Leaflet.Js Pixi Bootstrap Cypress GIS User Management Statistics E2E Testing

Education

Degrees, certifications, and relevant coursework

Poznan University of Technology

Master of Science, Computer Science

2019 - 2021

M.Sc. studies with specialization in Advanced Internet Technologies and thesis on a tax burden comparison application built with React, Express.js, and Leaflet.js.