Hi, I'm Oskar! 👋

I'm a Product Engineer who makes people's lives easier.

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# About me

  • Role

    Product Engineer

  • Location

    Poland

  • Experience

    7 years

Hi again! I'm Oskar, always looking for new challenges and opportunities to grow. On a daily basis, I build complex applications things that work well, feel right, and solve real needs. Since my teenage years, I have been building things from scratch, and initially, most of them were aimed at simplifying life for myself and the people around me. Over time, it became my job, and now I enjoy it every day. My specialization is still crafting user interfaces, but with the latest AI models and with solid computer science knowledge I can jump into backend and deploy things too, so I can deliver end-to-end solutions. I'm mostly focused on solving problems, or even better, eliminating them, and languages/frameworks are just tools I use. By the way, I still haven't told you, I love working with Vue.js , Tailwind CSS , and TypeScript .

How I help companies move faster

I can turn unclear needs into practical plans, prototypes, code, and shipped improvements without losing sight of the business outcome.

  1. Business need
  2. Planning
    • Discoveryright problem
    • Scopeclear path
    • Estimatescost control
  3. Prototyping
    • Wireframesquick validation
    • User flowsclear journey
    • Clickable UIshared understanding
  4. Engineering
    • Frontendfast interface
    • APIsconnected systems
    • Datareliable state
  5. Delivery
    • Deploymentlive product
    • QAfewer surprises
    • Feedbackbetter next version
  6. Working solution

# Companies

  • Hacknite

    August 2024 - August 2025

    Lead Frontend Developer

    Hacknite

    Hacknite delivers effective, hands-on cybersecurity training through CTF events. Its EU-hosted platform lets organizations create, manage, and monitor CTFs with expert-crafted challenges, clear progress reporting, and enterprise-ready features.

    • # Delivered a multi-module application with integrated user and admin interfaces in a single application.
    • # Built a fast, responsive application powered by TanStack Query for efficient data fetching and caching.
    • # Integrated a complex backend using a ReDoc-documented API schema for clear, reliable integration.
    • # Designed a clear, layer-based architecture (Nuxt Layers) to improve project understanding and streamline AI-assisted development.
    • # Adopted Nuxt UI as the default UI library, improving developer experience, consistency, and type safety.
    • # Designed and implemented Hacknite's public website, delivering a performant, accessible, and SEO-optimized marketing presence.
  • Ragnarson

    July 2021 - Present

    Frontend Developer

    Ragnarson

    In July 2021, I joined Ragnarson, marking the beginning of my professional journey as a Frontend Developer. While I still engage in backend work, my passion lies in crafting user interfaces. Ragnarson has provided me with invaluable experience and growth opportunities. Due to confidentiality agreements, I'll focus on providing key accomplishments for the projects I've worked on, without disclosing specific names.

    • # Migrated the entire application from Vue 2 to Vue 3 while simultaneously integrating new features, ensuring code quality and maintainability.
    • # Transitioned legacy styles (SCSS, CSS) to Tailwind CSS, utilizing components from Tailwind UI for improved consistency and efficiency.
    • # Integrated Inertia.js as the primary framework, significantly enhancing development workflow and application performance.
    • # Developed a custom calendar booking system with advanced date management features, enhancing user scheduling capabilities.
    • # Built a custom permission system to manage multiple user roles with distinct access levels, ensuring security and proper authorization.
    • # Implemented real-time chat and notification systems using GetStream.io, providing users with dynamic, responsive communication.
    • # Implemented real-time video calls with screen sharing using Agora.io for enhanced remote mentorship.
    • # Diagnosed and resolved bugs within the application to improve stability and performance.
    • # Enhanced the music search functionality, addressing race-condition issues to ensure smooth, responsive UX, particularly when using filters.
    • # Implemented optimistic updates to provide real-time feedback, allowing users to see changes immediately while maintaining data integrity.
    • # Collaborated with clients and designers to implement pixel-perfect Figma designs, ensuring visual accuracy.
    • # Developed new features and pages while addressing bugs inherited from legacy code, improving functionality and stability across the platform.
    • # Designed and implemented custom page animations, significantly improving user experience on the landing page.
    • # Designed and implemented the project structure and frontend architecture, laying the foundation for a scalable and maintainable app.
    • # Integrated WebSocket functionality to handle real-time communication, enabling instant updates for chat messages across multiple projects.
    • # Efficiently managed and displayed large volumes of incoming data in real-time, ensuring a smooth user experience for chat functionalities.
    • # Created responsive and complex layouts, delivering a consistent experience for both desktop and mobile users.
    • # Developed an interactive dashboard with complex graphs for real-time system monitoring.
    • # Delivered the MVP version under tight deadlines to ensure the platform was showcased at an important industry event.
    • # Collaborated with a demanding designer to implement detailed UI interactions and data displays, maintaining high design standards.
    • # Contributed to the integration of frontend and back-end systems for seamless real-time monitoring and control of urban farming operations.
    • # Took full ownership of a new project, working closely with clients to discuss features, prepare estimates, and keep the backlog and tasks up to date.
    • # Delivered features in PHP (Laravel) despite not having prior experience, quickly adapting to backend development with the help of AI.
    • # Led the transition to Linear for project management, moving from a Notion-based workflow to a more modern and effective process.
    • # Migrated the entire frontend to PrimeVue from a custom-built UI system, enabling faster and easier future development.
    • # Mentored the backend developer in Inertia.js, enabling faster, smoother collaboration and ensuring project requirements were met.
    • # Acted as the client's product partner, leading discovery and feature planning, advising on priorities and scope, and shaping roadmaps to meet deadlines.
    • # Led a full platform architecture migration to Railway, dramatically improving developer experience while reducing the client's infrastructure costs by 80%.
    • # Implemented end-to-end AI analysis for messy Excel files, transforming unstructured imports into editable, structured datasets with a fast review experience that helps users validate and correct data before saving.

# Projects

  • aneta.sekutowicz.pl

    Developed a professional business website, migrating from WordPress to Nuxt.js for improved performance and maintainability. The new implementation significantly reduced page load times and simplified content management.

  • codar.pl

    Developed a high-performance landing page for a family company, replacing an outdated WordPress site with a modern solution focused on improving page speed and SEO. The new website provided a faster, more accessible user experience while enhancing search engine optimization.

  • ONLYPVP

    Developed a comprehensive website for a Minecraft PVP practice server, enabling users to purchase services, view player profiles, find other servers, and search for new guilds. The platform provided an engaging and secure user experience tailored to the Minecraft community.

  • ENCHANT

    Developed the frontend for a large Minecraft server's website, catering to thousands of players. The platform enabled users to purchase services, search for players and guilds, and offered various interactive features tailored to the gaming community.

  • gdk.com.pl

    Rebuilt the website for an institution, significantly improving performance, usability, and manageability. The updated platform offered a faster, more user-friendly experience compared to the outdated version, addressing key issues in performance and content management.

  • And other projects that I'm not allowed to show you... 🤐

    But when I get a chance I can tell you about them!

# Education

You might notice that my studies are not in computer science. As a self-taught developer, I find it easier to learn technical skills independently. I chose to study management because I believe a broad understanding of business benefits my clients. After all, the code I write directly impacts their businesses. This combination of technical skills and business knowledge allows me to create more effective solutions for my clients.