Freelancer profile translated to English.

Description

Software Engineer & UI/UX Designer

Creative. Technically skilled. User-centric.

I have been developing accessible, performant, and reliably tested web UIs with React & TypeScript for 3.5 years. My focus is on complex form/data workflows, design system components, and modernizing large frontends.

I love clean APIs, clear responsibilities, and measurable results.

What I'm particularly good at

Form Flows & Data Logic: React Hook Form, React Query, Validation, Error Patterns, Stable Error Handling.
Design Systems: Component Architecture, Storybook v8, Theming (MUI/AntD→MUI), A11y/WCAG from the start.
Modernization & Performance: React 16→19, Dependency Refresh, Code Splitting, Memoization, Bundle Hygiene.
Quality: Jest/RTL, Meaningful Coverage, CI/CD (GitLab), Clean DX, Traceable Commits.

Typical Results

Load Time −30–40%, more stable interactions, fewer re-renders.
Error Rate −30–50% in forms through clear validation & UX error patterns.
A11y Findings Significantly Reduced (Landmarks, Focus Management, ARIA).

Tech Stack

React 18/19, TypeScript, React Hook Form, React Query, MUI, Ant Design (Migration to MUI), Storybook, Jest/RTL, Vite/Webpack, Node/Yarn/NPM, Docker (Basics), REST/GraphQL (Basics), CI/CD (GitLab)

Working Method

FirstAudit & Prioritization (Perf/A11y/UX/Error Paths), then incremental implementation.
Component Library First: Reusable, documented, testable.
Accessibility and Testing are standard, not add-ons.

Engagement & Models

Open to freelance or employment depending on project phase.

Industry field of expertise

Languages

Polish
Native or bilingual
German
Fluent
English
Fluent

Workplace preferences

Remote only

Primarily works remotely

medicomp GmbH
SOFTWARE ENGINEER (FRONTEND, REACT)
HEALTH AND WELLNESS
March 2025 - Today (1 year and 3 months)
Ludwigshafen am Rhein, Germany
Enterprise Frontends for Health Insurance/Social Services: Rating platform & client management (document/case management, calendar, reporting), complex DataGrids (filters, pagination, inline editing, search), role & permission management, uploads, admin interface, responsive UI, multi-tenant React component library
Migration React 16 → 19, accessibility (A11y), GDPR compliant, security (RBAC/2FA), performance optimization (lazy loading, Workbox caching) and i18n
Delivery capability: test-driven development, automated deployments, close coordination with PO & Backend
Tools: React, TypeScript, React Router, React Context, Redux, REST (Axios), Yup, MUI, Docker, GitLab CI/CD, Jest/RTL, Storybook, awork, Postman, Webpack/Babel, OAuth2/JWT, Workbox, Cursor
React.js TypeScript JavaScript HTML5 MUI
Joanna Cwalina
SOFTWARE ENGINEER (FRONTEND, UI&UX)
May 2024 - March 2025 (10 months)
Projects: Coach SPA, Dance School Website (Full-Stack) & Event Platform (Lists/Filters, Admin, Modular)
Tools: React, Node.js, MUI/Bootstrap, Git/GitHub, CI/CD (Netlify), Brevo, UI/UX, IA, SEO, Responsive
React.js Node.js Web Design TypeScript Bootstrap
NEBENBERUFLICHER
LIFE COACH
May 2024 - Today (2 years and 1 month)
Hypnosis & Inner Child Work: Individual sessions, workshops & events, dance formats, group work, mentoring for personal/professional development
Coaching