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Illia Sapa
Java Backend / Fullstack Developer (Java, Spring Boot, Angular)
[open contact info](look above in the "contact info" section) [open contact info](look above in the "contact info" section) Banská Bystrica

Summary
Junior Java Backend and Fullstack Developer with 1+ year of hands-on experience building scalable backend systems and modern web applications. Developed Cipher - a full-stack trading and investment
platform with real-time WebSocket integrations, JWT authentication, and PostgreSQL on the backend, and Angular on the frontend. Experienced in designing and implementing REST APIs, working with relational
databases, and building features end-to-end. Comfortable working across the entire stack and delivering complete features end-to-end. Currently pursuing a degree in Applied Informatics at Matej Bel University,
Slovakia.

Education
Matej Bel University Bachelor's
Applied Informatics and Software Development Banská Bystrica • Sep 2024 — Jun 2027

Experience
Nastartovac s.r.o. Banská Bystrica
Frontend Web Developer Apr 2025 - Sep 2026
• Developed and customized WordPress websites for clients using Elementor, Blocksy, Shopify and WooCommerce
• Implemented multilingual support with WPML for international projects
• Built responsive and cross-browser compatible layouts using HTML5 and CSS3
• Collaborated with project managers to deliver client requirements on time
https://www.nastartovac.sk/

Projects
Cipher - Trading & Investment Platform
Java 17, Spring Boot, Hibernate, JPA, PostgreSQL, WebSocket, Lombok, Angular
• Built a full-stack trading and investment platform covering both cryptocurrency and traditional financial assets
• Implemented real-time price updates via WebSocket integration with Binance and Finnhub APIs
• Developed JWT authentication and user account management
• Built multi-portfolio system allowing users to create and manage multiple investment portfolios
• Implemented portfolio and account performance tracking with dynamic charts
• Worked across the full stack - Spring Boot backend and Angular frontend - delivering complete features end-to-end
• Containerized the application with Docker for consistent local development and deployment
https://github.com/yexur3/Cipher

E-commerce Order Processing System
Java 17, Spring Boot, PostgreSQL, Spring Retry, Docker, JUnit, Mockito, Testcontainers, GitHub Actions
• Built a solo backend service focused on correct business logic: a strict order-status state machine, transactional inventory management, and a simulated unreliable payment gateway with automatic retry
• Implemented optimistic locking (JPA @Version) to prevent overselling under concurrent order requests
• Wrote a full test suite (unit tests, Mockito-based service tests, Testcontainers integration tests) with CI enforced via GitHub Actions on every push
https://github.com/yexur3/ecommerce-order-service

URL Shortener & Analytics API
Java 17, Spring Boot, PostgreSQL, Redis, Docker
• Built a solo backend service for creating short links with detailed click analytics (IP, referrer, user agent) and a real-time click counter
• Implemented Redis caching on the redirect path to reduce database load, with asynchronous click-logging (@Async) so tracking never delays the user-facing redirect
• Designed a Base62 encoding scheme to generate short, unique codes from database-assigned IDs
https://github.com/yexur3/url-shortener

Skills
Backend
Java, Spring Boot, Spring Retry, REST API design, Hibernate, JPA, WebSocket, JWT, Maven, Lombok

Testing & CI/CD
JUnit, Mockito, Testcontainers, GitHub Actions

Frontend
Angular, TypeScript, JavaScript, HTML, CSS

Database
PostgreSQL, MySQL, SQL, Redis

Tools
Git, GitLab, GitHub, Docker, Linux

Languages
English
B2

Ukrainian
Native

Slovak
B1