Valerii Matviiv

CS Student & Full-Stack Developer

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

I'm studying Computer Science at AGH University in Kraków. I've worked on both sides of the stack - cloud infrastructure on Azure, backend services in Java, and frontend interfaces in React. This site documents what I've built and learned along the way.

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

CS student at AGH University in Kraków (GPA: 4.73/5), with an Erasmus semester at NOVA School of Science and Technology in Lisbon. I've built and shipped cloud-native services on Azure - Java backends, Redis caching, Spark jobs - and led frontend work in React. I'm comfortable on both sides of the stack and prefer it that way; whatever the project needs, that's what I work on.

Technical Skills

Frontend

ReactTypeScriptJavaScriptNext.jsTailwind CSSStyled ComponentsComponent LibrariesShadcn/ui

Backend & Infrastructure

JavaNode.jsExpress.jsRESTful APIsSQLAzureApache SparkAzure FunctionsCosmos DBRedisDockerKubernetesMongoDB

Tools & Other

GitAlgorithmsData StructuresMavenArtilleryFaker.jsViteFigmaCypress

Main Projects

Cloud-Native Lego Auction Platform

Private Repository

Sep 2025 – Nov 2025

Built and deployed core REST endpoints for an auction API on Azure App Service using Java and Maven.
Designed a two-level Redis caching strategy (object + list caches at the API layer) that cut mean response time by 57% (180ms → 77ms) and dropped p99 latency from 3.5s to 153ms, verified with load tests.
Wrote a time-triggered Azure Function ("Auction Closer and RecentLegoSetsTracker") to manage auction lifecycle and keep the Redis Sorted Set of recent items up to date.
Built an Apache Spark job on Azure Databricks to process historical bid data and surface trending Lego sets.
Ran Artillery/Faker.js load tests against two server configs - the caching fix eliminated all 46 ETIMEDOUT failures and cut mean latency from 2.2s to 482ms (78% reduction).
Re-deployed the entire platform using Docker, Kubernetes, and MongoDB to remove Azure vendor lock-in.

Java (JAX-RS)MavenAzureCosmos DBRedis CacheAzure FunctionsApache SparkDockerKubernetesMongoDBArtilleryFaker.jsGit

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

Awards & Certificates

• Rector's Scholarship at AGH University of Kraków

• Principles of UI/UX Design

• Developing Back-End Apps with Node.js and Express

• Participation in Deployed's Frontend Workshop

Languages

Ukrainian

Native

English

Fluent

Polish

Intermediate

German

Intermediate (out of practice)