Kuba Ellwart / pxseu / backend

backend engineer · builds reliable systems

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About Me

Hey, I'm Kuba — online I go by pxseu. I'm 21 years old and have been writing code for 7 years. I mostly work on backend services and internal tooling. I also enjoy frontend when it makes things easier to understand and use.

I like building systems that stay simple under load and readable months later. Clear naming and predictable behavior matter to me.

I work best with thoughtful people and direct feedback. Most good results come from small, honest conversations and steady progress.

I'm curious by default, so I spend a lot of time learning, tinkering, and following ideas until they finally click. That's probably my favorite part of this work.

Outside of code, I'm into cars, oddly specific gadgets, and sometimes making videos about what I'm working on. I like things that are practical, a little nerdy, and built with care.

If you want to chat, collaborate, or just say hi, my inbox is open. =]

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Experience

2020 - Present

Full Stack & Systems Developer

Independent

Open source and freelance work across backend and tooling. Contributed to projects including Bun, Kaito HTTP, and DefinitelyTyped. Built smaller side projects too, like Crabdis, a Redis-style clone in Rust.

2025

Full Stack Developer

c/side

Worked across the stack on product features and internal tooling. Shipped frontend and backend changes, improved reliability, and owned a lot of cross-service glue work.

2024 - 2025

Backend Developer

Incard Ltd.

Helped merge two services into one platform focused on open banking and e-commerce. Standardized shared schemas, improved developer workflows, and integrated payment providers including Stripe and Google Pay.

2022 - 2024

Product Engineer

Hop Inc.

Built and maintained Hop's CLI, including the `hop deploy` workflow. Automated deployment paths, owned core CLI features, and reviewed related internal services.

2020 - 2022

Full Stack Developer

PreMiD & Freelance

Contributed features, fixes, and localization work for PreMiD plus other open source projects I actively used.

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Skills

Back-end

Node.jsFastifyPostgreSQLRedisRESTWebSocket

Frontend

React / Next.jsTailwindCSSVite

CLI / Tools

RustTypeScriptAutomationTerminal UX

DevOps

DockerLinuxGitCI/CDSystem Automation

Other

PythonC/C++Event-Driven ArchitecturesTesting

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Projects

Repository

hopinc/cli

Interact with Hop in your terminal. Written in Rust.

View on GitHub

Repository

pxseu/pxseu.com

My personal portfolio website. Built with TypeScript.

View on GitHub

Repository

pxseu/anilist-readme

Showcases your latest AniList activity in your GitHub README. Made with Python.

View on GitHub

Repository

imperialbin/imperial.js

Official Node.js wrapper for imperialb.in, written in TypeScript.

View on GitHub

Repository

pxseu/lanyard-ui

Visualizes Discord presence data from Lanyard with a minimal UI. Built with TypeScript.

View on GitHub

Repository

pxseu/crabdis

A tiny Redis-like clone... but a little rusty. Written in Rust.

View on GitHub

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Contact