Resume of Leonid Domahalskyy • Peerlist

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Leonid Domahalskyy

Solo dev. Building Daily Coding.

Joined 05 Sep 2026

Experience

1 year, < 1 month

Pingu Solutions GmbH

Fullstack Developer

Sep 2025 - Present (1 yr, < 1 m) • flensburg, de • full-time

Solo developer of Daily Coding (daily-coding.dev), a platform that serves one coding challenge per day and grades the solution against real test cases in a sandbox.

I built the whole stack: Next.js 16 with React 19 and TypeScript, Prisma on PostgreSQL, Auth.js, and a self-hosted Piston sandbox behind a reverse proxy that runs untrusted code in ten languages, from JavaScript and Python to Java, Go, Rust and C++.

Bilingual (German and English), open source under MIT. I do the product, design, content and marketing as well.

ReactJS

TailwindCSS

TypeScript

NextJS

NodeJS

Git

GitHubCICD

docker

PostgreSQL

Hochschule Flensburg

Academic Tutor

Sep 2025 - Jan 2026 (4 m) • flensburg, de • part-time

Tutor for Web Engineering in the computer science programme, supporting a group of around 15 students through the semester.

I ran the weekly exercise sessions, walked students through their own code when it did not work, and graded and gave feedback on submissions. The most useful part was learning how beginners actually get stuck: rarely on the syntax, mostly on breaking a task into steps and on reading error messages.

That experience fed directly into Daily Coding, where the hints and test-case feedback are built around exactly those sticking points.

deno

SQLiteHTML / CSS / JavaScript

Education

Flensburg University of Applied Sciences

Bachelor of Science - BS, Computer Science

2022 - 2026