t
th3mon

Przemyslaw S.

@th3mon

Senior Fullstack Engineer

Polen
Polnisch, Englisch
Einige Informationen werden in englischer Sprache angezeigt.
Über mich
Senior Fullstack Engineer (React / TypeScript / Node.js). Started programming at the age of nine and now has over 15 years of professional experience developing modern, scalable web applications across both frontend and backend. Core Technologies React • TypeScript • Node.js • Next.js • REST / GraphQL • PostgreSQL • MongoDB • Redis • Docker • CI/CD • AI-assisted development (ChatGPT, GitHub Copilot, Codex)... Mehr lesen

Kompetenzen

t
th3mon
Przemyslaw S.
offline • 
Durchschnittliche Antwortzeit: 1 Stunde

Meine Dienstleistungen

Fehlerbehebung
I will debug and fix your react typescript application
Ab30 $ / ProjektWeitere Details

Arbeitserfahrung

Szelenberger.pl

Freelance Full Stack Developer

Szelenberger.pl • Freiberufler

Oct 2008 - Present • 18 yrs

Developed websites and e-commerce platforms for local businesses. Built both frontend and backend functionality using JavaScript, PHP and MySQL, including WordPress and PrestaShop-based projects.

Makimo

Senior Full Stack Engineer

Makimo • Vollzeit

May 2026 - Jul 2026 • 2 mos

Developed frontend features for the Election TouchScreen TV App using React and TypeScript. Worked with Zustand, React Query, Zod, SCSS and BEM, integrating the frontend with REST APIs and WebSockets. Maintained code quality through unit and end-to-end testing, code reviews, and automated testing with Vitest, React Testing Library and Playwright.

WATS

Senior Full Stack Engineer

WATS • Vollzeit

Aug 2023 - Sep 2025 • 2 yrs 1 mo

Developed frontend and backend features for the Parametrization App, a tool used to configure a transactional system. Contributed to architectural decisions and technical design, and created internal tools to improve developer experience. Built a custom frontend build and deployment pipeline using Gulp.js for a legacy Ext JS and RequireJS environment. Led remediation work following a security audit, identifying and fixing vulnerabilities across both frontend and backend. Worked with JavaScript, TypeScript, Node.js, Ext JS, Backbone.js, PostgreSQL, Redis and WebSockets, with a strong focus on testing, maintainability and code quality.