Valerii Matviiv

CS Student & Full-Stack Developer

Welcome to my portfolio. (Try cyberpunk mode in the navbar - it's worth it.)

I'm a 3rd year CS student at AGH University in Kraków, currently interning at ABB as a Testing Processes & Automation Intern. I work across the full stack - frontend, backend, deployment - whatever the project needs. This site documents what I've built and learned.

About This Portfolio

This page is a styled version of my CV
Projects page has direct words I would say about those projects, without the usual resume jargon. Unfortunately, I didn't have the time to write about all of them, but I plan to add more in the future, Also so far I didn't add other pages yet :( Feel free to explore, and switch themes using the style button in the nav.

Curriculum Vitae

Professional Summary

3rd year CS student at AGH University, Kraków (GPA 4.73/5), with an Erasmus semester at NOVA School of Science and Technology in Lisbon. I work across the full-stack – frontend, backend, deployment – and just do whatever the project needs.

Technical Skills

Languages
JavaTypeScriptJavaScriptSQL/NoSQL
Frameworks / Tools
ReactNext.jsNode.jsExpress.jsTailwind CSSRedisPlaywright
Cloud & DevOps
AzureAWSDockerKubernetesGitHub ActionsGit

Work Experience

Testing Processes & Automation Intern

ABB

April 2026 – Present

  • Built a test automation engine from scratch using TypeScript and Playwright for the eConfigure web app, configuring ESLint, Prettier, and local scripts.
  • Designed a dual-mode system ("Strict" vs "Report-Only") to catch application errors during regression runs without breaking builds.
  • Built a flexible abstraction layer to support testing across different application variants with entirely distinct DOM architectures.
  • Found and reported dozens of bugs, delivering a stable regression testing framework and writing all technical documentation.
Tech: TypeScript, Playwright, GitHub Actions, ESLint, Prettier, Husky

Main Projects

Cloud-Native Lego Auction Platform
Private Repository

Sep 2025 – Nov 2025

  • Designed a two-level Redis caching strategy; load tests confirmed it eliminated all 46 ETIMEDOUT failures, cut mean response time by 57% (180ms to 77ms) and p99 latency from 3.5s to 153ms.
  • Found and fixed a critical security flaw: unauthenticated endpoints were accepting data modifications under high request volume.
  • Re-deployed the entire platform using Docker, Kubernetes, and MongoDB to remove Azure vendor lock-in.
JavaMavenAzure (App Service, Cosmos DB, Blob Storage, Redis Cache, Azure Functions)Apache Spark (Databricks)ArtilleryFaker.jsDockerKubernetesMongoDB
Student Testing Platform
GitHub

Apr 2025 – Jun 2025

  • Took the lead on frontend development, managing the team's Git workflow and conducting PR reviews for two junior developers.
  • Built most of the student-facing and teacher-facing interfaces in React and JavaScript using React Router - auth flows, exam management, student dashboards, and shared views.
  • Extended Shadcn/ui with custom reusable components (debounced inputs, date-time pickers, pagination) using Tailwind CSS to keep the UI consistent across all views.
ReactJavaScriptReact RouterTailwind CSSShadcn/uiViteGit

More context on each of these - what actually happened, what broke, what I'd do differently - is on the Projects page.

Education

AGH University of Kraków

Bachelor of Computer Science

Oct 2023 – Feb 2027

GPA: 4.73/5

NOVA School of Science and Technology

Erasmus Exchange Program

Sep 2025 – Jan 2026

Lisbon, Portugal

Languages

Ukrainian

Native

English

Fluent

Polish

Intermediate

Explore (Not Yet Implemented)

Projects

Explore my technical projects including full-stack web applications, frontend work, and collaborative team projects.

Journey

Follow my path through Computer Science, from foundational skills to advanced development practices and continuous learning.

University

Learn about my academic experiences at AGH University and my Erasmus semester at NOVA School of Science and Technology.