Available for collaborations

Hi, I’m Konrad.FullStackEngineer

I build modern web products end-to-end — from pixel-perfect interfaces to robust APIs and database design. Currently shipping production platforms across healthcare, education, and other industries.

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01 — About

Engineer who treats the whole stack like one product.

I’m a Full Stack Engineer, I ship production web platforms across healthcare, education, and other industries. I own features end-to-end — designing the API, modelling the database, wiring up the UI, and writing the tests that keep it all from drifting.

Over the past two years I’ve shipped production features across multiple industries, rebuilt an authentication system from scratch with modern encryption and MFA, and supervised international teams to keep delivery aligned with design. The path here ran through IT-support internships, a web-dev gig at a print shop, and a front-end role that grew into the full-stack one I have today.

Outside of code I’m into photography, music, and travel — they’re where most of my better product ideas come from.

3+
Years shipping production
5+
Industries shipped to
30+
Tech across the stack
02 — Experience

A short trail from help desk to full stack.

  • Jul 2024 — Present · Poznań Metro Area

    Full Stack Engineer

    Full Stack House

    Shipping end-to-end features across production web platforms in healthcare, education, and other industries. Redesigned an authentication system with modern encryption and MFA. Supervising international teams to keep delivery aligned with product and design.

    NestJSASP.NETNext.jsPostgreSQLSupabaseMS SQL
  • Mar 2024 — Jul 2024 · Poznań Metro Area

    Front-end Engineer

    Full Stack House

    Built dashboards and views across multiple client platforms. Independently shipped a client’s marketing site end-to-end, refactored legacy code, and added Playwright coverage to prevent regressions.

    ReactNext.jsTypeScriptPlaywrightSentry
  • Jul 2023 — Aug 2023 · Legnica, Poland

    Web Developer Intern

    Studio Reklamy i Druku FTPrint

    Designed and built the company website end-to-end — Figma mockups through to interactive HTML/CSS/JS implementation.

    HTMLCSSJavaScriptFigma
  • Jun 2022 — Jul 2022 · Ścinawa, Poland

    IT Support Specialist Intern

    Urząd Miasta i Gminy Ścinawa

    Operated the municipality’s stove-declaration tracking system, resolved IT issues for staff, and provided day-to-day technical support to keep office operations running.

    Help DeskTechnical Support
  • Jun 2021 — Jul 2021 · Ścinawa, Poland

    IT Support Specialist Intern

    Urząd Miasta i Gminy Ścinawa

    Operated a speech-to-text system that transcribed city council meetings into official records, troubleshot IT problems for staff, and maintained office equipment.

    Help DeskTechnical Support
03 — Skills

The toolkit I reach for.

Whatever the layer of the stack, I’ve probably shipped something on it. Here’s the day-to-day.

TypeScript/Next.js/React/NestJS/.NET/PostgreSQL/Tailwind/Playwright/Redis/Node.js/Vitest/Sentry/C#/Prisma/MS SQL/Firebase/Electron/Figma/Payload CMS/Radix UI/Headless UI/Telnyx/New Relic/PostHog/Airtable/TypeScript/Next.js/React/NestJS/.NET/PostgreSQL/Tailwind/Playwright/Redis/Node.js/Vitest/Sentry/C#/Prisma/MS SQL/Firebase/Electron/Figma/Payload CMS/Radix UI/Headless UI/Telnyx/New Relic/PostHog/Airtable/

Frontend

01

Building interfaces that feel inevitable.

TypeScript
React
Next.js
Tailwind CSS
Electron
Chakra UI
Material UI
Radix UI
Headless UI

Backend

02

APIs, services, and the data behind them.

NestJS
Node.js
.NET / ASP.NET
C#
Java
REST APIs
Payload CMS
Telnyx

Data & Infra

03

Stores, caches, and the rest of the pipeline.

PostgreSQL
MS SQL
Redis
Prisma
Supabase
Firebase
Airtable

Quality & Tooling

04

Tests, observability, and the bits that prevent regressions.

Playwright
Vitest
Jest
Sentry
New Relic
PostHog
Git
Figma
Photoshop
04 — Selected work

Things I’ve built lately.

More on GitHub
Pantry

Pantry

Household pantry tracker — every jar, bottle, and bag kept in its room. Multi-user sharing with low-stock alerts and expiry tracking.

Next.jsTypeScriptTailwind CSSDrizzleNextAuth
Live Code
Bimbeer

Bimbeer

Desktop app from the multi-platform Bimbeer system — Tinder-style matching for beer lovers, based on shared taste and location.

ElectronJavaScriptChakra UIFirebase
Download Code
Pixel Day

Pixel Day

Pixel-art notebook and organizer with mini-games. Manage your day inside a 16-bit-styled productivity app.

Next.jsTypeScriptTailwind CSSFirebase
Live Code
Horizons

Horizons

A web platform for creating, sharing, and discovering AI-generated art. Users prompt models, build a feed, and follow other creators.

ReactJavaScriptChakra UIFirebase
Live Code
Pieometry

Pieometry

Pizza-dough calculator that turns batch specs — ball count, flour weight, hydration, proofing time — into precise gram amounts of every ingredient.

Next.jsTypeScriptTailwind CSSZod
Live Code
Free Parking

Free Parking

Find, favorite, and rate free parking spots near you. Map-driven UX backed by an open API and a community ratings layer.

Next.jsTypeScriptChakra UIPrisma
Live Code
CleanScape

CleanScape

Field companion for cleaning crews — track equipment, jot on-site notes, and put together service valuations on the spot.

React NativeExpoTypeScript
Download Code
Rank That Cracker

Rank That Cracker

Rate crackers 1–10, keep your personal rankings, and see community-aggregated leaderboards.

Next.jsTypeScriptSupabaseTailwind CSSSWR
Live Code
05 — Contact

Have something
worth building? Let’s talk.

Open to interesting full-stack work, freelance, and collaborations. The fastest way is email — replies within a day.

kkarkosz00@gmail.com
Email
Fastest way to reach me.
GitHub
Code, side projects, and contributions.
LinkedIn
Career history and professional network.