Sebastian
Kuliński

Developer · Opole, Poland

I build and develop websites and web applications. My day-to-day work on commercial projects gives me practical experience, while in my spare time I bring my own ideas to life and improve my skills in algorithms.

Get in touch View projects

About me

Hi! I'm Sebastian, a 17-year-old studying programming at ZSEk in Opole.

I started programming at the age of 12, writing my first programs in Python. At technical school, I soon became interested in building websites and web applications. Over time, I began putting my skills to use in both personal and commercial projects.

Beyond building websites and web applications, I'm also interested in maths and algorithms. I'm currently learning C++ and developing my skills in algorithms and data structures by working through NeetCode 250. I see my future career as a Software Development Engineer.

Alongside that, I'm gaining professional experience at Depcore and working on my own projects.

Stack

HTML
CSS
JavaScript
TypeScript
Angular
PHP
C#
C++
October CMS
Laravel
MySQL
Git

Experience

Work placement

April – June 2026

I designed and delivered a working gym management system covering memberships, training sessions, trainers and check-ins.

Designed the database and built the backend in October CMS, including QR code scanning.
Built tools for managing memberships, check-ins, training sessions and trainers.
Created a member dashboard showing the active membership and past memberships, payments and check-ins.

Junior Web Developer

July 2026 – present

I develop and modernise websites and solutions built with October CMS. My work includes migrating existing sites to October CMS 4, adding features and maintaining projects.

Migrating traditional PHP websites to October CMS 4 using Tailor and Builder.
Developing, updating and customising plugins and themes, including adding new features.
Building landing pages with HTML/CSS and October CMS.

Projects

2026

Hourly

Hourly is a staff scheduling app. Instead of planning shifts manually, you can generate a schedule, review warnings and make adjustments. Staff and schedules are managed in one dashboard.

The generator accounts for staff availability, shift types and staffing rules.
The calendar displays planned shifts and flags issues with working hours.
A staff dashboard and data import and export make it easier to manage the team and completed schedules.

HTML · Tailwind CSS · MySQL · JavaScript · PHP

View project

2026

Tour de App

Think different Academy is a course platform I co-created for Tour de App. I was responsible for the frontend and interface design, from page layouts to their implementation in React.

A homepage introducing the platform and providing access to courses.
A course catalogue with search and status filters.
Teamwork from the initial concept through to presenting the project to the jury.

We placed 12th out of 150 teams from across Europe and qualified for the grand final in Brno.

React · Tailwind CSS · JavaScript · UI / UX

About the competition View project

2025

Plakatowo

An online store for music posters, with a storefront for customers and a dashboard for day-to-day operations. Alongside the shopping features, I also worked on SEO.

A cart and ordering flow, from choosing a poster to checking the order status.
Online payment integration and discount codes.
An admin dashboard for adding products and managing orders.

HTML · CSS · JavaScript · PHP · MySQL

View project

Certificates & awards

INF.03 vocational qualification

I scored 100% in both parts of the INF.03 vocational exam, officially titled „Tworzenie i administrowanie stronami i aplikacjami internetowymi oraz bazami danych” (creating and administering websites, web applications and databases).

The exam assessed knowledge and practical skills in web development, database design and database administration.

Theory: 100%
Practical: 100%

Tour de App - Grand Final in Brno

Together with Bruno Szewczyk, I reached the final of the international Tour de App 2026 competition. We placed 12th out of 150 teams from across Europe.

In Brno, we had 9 hours to build a working application for Think different Academy. There was no ready-made specification, so we gathered requirements directly from the client and chose the features we could deliver in the time available.

After coding, we presented the app to the jury, demonstrating how it worked, which requirements we had met and the decisions we had made as a team.

European ranking: 12 / 150
Final location: Brno, Czechia

Contact

Get in touch
with me

Email or call

kontakt@skulinski.pl

Mon-Fri 17:00-19:00

Location

Opole, Poland

Available remotely across Poland

Social Media

Sebastian Kuliński