Назар

NAZAR SVITIASHCHUK
Java Developer
[відкрити контакти](див. вище в блоці «контактна інформація») • [відкрити контакти](див. вище в блоці «контактна інформація») • Lviv, Ukraine
github.com/onsviii • [відкрити контакти](див. вище в блоці «контактна інформація»)

PROFESSIONAL SUMMARY

Java Developer with nearly a year of commercial experience building and scaling backend
systems for production SaaS products. Hands-on experience with Spring Boot, Keycloak, and
cloud infrastructure (AWS, Docker). Worked on LLM API integrations and implemented ML-
based features including vector embeddings and semantic search. Comfortable working
across complex, multi-service architectures and participating in architectural decisions.

TECHNICAL SKILLS

Languages & Frameworks: Java, Spring Boot, Spring Data JPA, Spring Security, Hibernate,
Node.js, TypeScript, Express.js, REST API
Authentication: Keycloak, Firebase
Databases: PostgreSQL, MS SQL Server, Relational Database Design, Firestore
AI / ML: LLM API integration, OpenAI Embeddings API, semantic search, RAG
DevOps & Cloud: Docker, AWS
Testing: JUnit, Mockito
Tools: Git, GitHub, Maven, Log4j, Sentry
Software Design: OOP, SOLID, Design Patterns, Algorithms & Data Structures

WORK EXPERIENCE

Java Developer | Beleven | December 2025 – Present
IAMAI — B2B SaaS Platform for AI-Powered Strategic Planning
B2B platform combining a global gig-consultant network (300+ clients, thousands of
consultants) with an AI-powered strategic planning dashboard for companies.
• One of two backend developers across two interconnected products (IAMAI
Community and IAMAI Dashboard); participated in architectural discussions and
delivered complex features end-to-end.
• Built a personalized news feed system for each company: integrated ~100 RSS sources
with scheduled scraping, generated a company interest profile from its core data via
LLM, created embeddings for both the profile and news articles, and matched them via
cosine similarity.
• Designed and implemented Keycloak infrastructure consolidation across both
platforms and built a full self-registration onboarding flow: automatic temporary
workspace creation, company detection by email domain, join requests with full user
data migration (strategies and projects), and multi-workspace support allowing users to
belong to multiple workspaces simultaneously.
• Integrated LLM APIs (OpenAI, Anthropic, Gemini) to power AI features across the
platform including strategy generation and contextual AI chat.
Stack: Java 17, Spring Boot 2.5.x, Spring Data JPA, Spring Security, PostgreSQL, Docker, Jenkins, AWS,
Keycloak, LLM APIs

Story A Day — Swedish Mobile App with Daily Children’s Stories
Mobile application delivering new children's stories and fairy tales every day.
• Joined as the primary backend developer on an existing project and extended the
platform to support a web client alongside the mobile app.
• Added new REST API endpoints and expanded the data model.
• Collaborated in a small team alongside a mentor and a frontend developer.
Stack: Java 17, Spring Boot 2.5.x, Spring Data JPA, Spring Security, PostgreSQL, Jenkins, Keycloak, LLM
APIs

Chytanka - E-book and Audiobook Reading Platform
Platform for purchasing and reading digital books.
• Appointed as the sole backend developer to modernize, scale, and maintain the
platform's core infrastructure.
• Spearheaded the architectural migration of the backend from serverless Firebase Cloud
Functions to a dedicated Express.js server environment, improving system control and
scalability.
• Executed a complete codebase rewrite from JavaScript to TypeScript, establishing a
clean, modular, layered architecture (routers, controllers, services, repositories) with
Awilix for dependency injection and Zod for strict validation.
• Expanded business capabilities by designing and integrating a comprehensive
audiobook management system to complement the existing e-book functionality.
• Refactored legacy book management workflows and optimized database operations
with Firestore, significantly enhancing code maintainability and performance.
Stack: Node.js, TypeScript, Express.js, Firestore, Zod, Awilix, Firebase

EDUCATION

Master's Degree in Computer Science
Lviv Polytechnic National University • 2026 – Present

Bachelor's Degree in Computer Science
Lviv Polytechnic National University • 2022 – 2026

Bachelor's Thesis: "Monitoring and Decision Support System for Small Smart Enterprises".
Focuses on distributed microservice architecture, NLP-based sentiment analysis, and LLM-assisted
data processing.

LANGUAGES
• Ukrainian (Native)
• English (Intermediate B1)