Konrad Litwinowicz
From: Poland
Location: Wrocław
On Useme since 2 November 2026
About me
Full-stack developer .NET / React z ponad 4-letnim doświadczeniem komercyjnym (Credipass, DFIN, Unit4, Sygnity). Własna firma, faktura VAT, marka KodikoLab.
Robię: - aplikacje webowe i panele (C#, ASP.NET Core, Blazor, React, TypeScript, Next.js), - REST API i integracje: BLIK / Autopay, Stripe, InPost, logowanie Google / Apple, KSeF, - funkcje AI w aplikacjach (OpenAI, Claude): odczyt dokumentów, kategoryzacja, - migracje, np. WooCommerce na własny sklep, - wdrożenia: Docker, VPS, CI/CD, kopie zapasowe, monitoring.
Moje działające produkty (szczegóły w portfolio): Halfycraft (sklep, Next.js + .NET, BLIK, InPost), Tavoria (platforma dla gastronomii, .NET + React), Kwitto (PWA offline, AI do paragonów), mamklucz (web + iOS/Android), RoamCrown (aplikacja mobilna z mapami).
Pracuję z Claude Code: architekturę, review, testy i wdrożenie robię sam, więc dowożę szybko i z testami. Zdalnie, Wrocław.
Categories
CV / Résumé
Aug 2023 - Now
Software Engineer (B2B contract)
Credipass
Developing an internal CRM-style platform for a network of 700+ mortgage advisors: full-stack .NET / C# and React on Azure. REST APIs in ASP.NET Core, EF Core and SQL Server, Scrum team with code review.
Jan 2023 - Jun 2025
Software Engineer
Donnelley Financial Solutions (DFIN)
Full-stack C# / .NET development of ArcReporting (DFIN Arc Suite), a financial and regulatory reporting platform for investment funds. Code reviews and design decisions.
Jun 2022 - Jan 2023
Junior Software Engineer
Unit4
Features in enterprise ASP.NET applications in an agile team, from backend services to UI.
Feb 2022 - May 2022
Junior Developer
Sygnity S.A.
Web features in ASP.NET in a development team (part-time).
Portfolio
Handmade shop that replaced WooCommerce (with data migration). Next.js 16 + GrandNode (.NET) headless, Autopay / BLIK payments, InPost shipping, custom seller panel (orders, returns, stock).
Group expense splitting app. Offline-first PWA, AI receipt reading and categorisation (OpenAI, Claude). .NET 10 backend (Clean Architecture, SignalR), React 19 + TypeScript frontend.
Mobile app (beta): walks, runs and rides claim municipalities on a map, leaderboards, clubs. React Native / Expo, .NET 10, PostGIS, offline mode, Strava, Garmin, Polar integrations.
Restaurant platform: venue page, QR menu, loyalty card in Apple / Google Wallet, bookings, email / SMS campaigns. .NET 10, multi-tenant PostgreSQL (RLS), React 19, Loyverse, Facebook, Instagram, Google integrations.
Shared renting app: roommate matching, commute map, move-in report, bills, deposit settlement, PDF lease. .NET 10, PostgreSQL, React 19 + Capacitor (web, iOS, Android).
My studio brand: web and mobile apps, integrations (payments, KSeF, POS) and AI for businesses. Site built with React 19, Vite, Tailwind and three.js.