Andrii

Andrii Tynskyi
Junior AI & Software Engineer | AI/ML / Python / Java / Spring Boot / SQL / REST API
Szczecin, Poland | [відкрити контакти](див. вище в блоці «контактна інформація») | [відкрити контакти](див. вище в блоці «контактна інформація»)
Portfolio: tynskyi.pl | LinkedIn: [відкрити контакти](див. вище в блоці «контактна інформація») | GitHub: github.com/ta56419

PROFESSIONAL PROFILE
Computer Science student at the West Pomeranian University of Technology in Szczecin, seeking an internship or first
junior role in AI/ML or software engineering. I build Python projects involving machine learning, RAG, and LLM
evaluation. My project experience also includes Java/PHP backend development, REST APIs, Android, SQL/MySQL,
Docker, and IoT.

SKILLS & TECHNOLOGIES
AI/ML: Python, pandas, scikit-learn, RAG, SQLite FTS5/BM25, LLM evaluation, prompt injection | Backend/API: Java, Spring
Boot, PHP, FastAPI, REST APIs, JPA/Hibernate, HTTP/JSON
Data: SQL, MySQL, MariaDB, H2, SQLite, PDO, relational data modelling | Web/Mobile: HTML, CSS, LESS, PHP
MVC/ActiveRecord, Android, Java, Firebase, XML
Testing & Tools: JUnit, Mockito, Postman, Docker, Maven, Git, GitHub Actions, VS Code, IntelliJ | Other: C, C++, C#, Arduino,
STM32, PlatformIO, Kotlin (currently learning)

EXPERIENCE
SOFTSERVICE TECHNOLOGIES LTD - Programming Support Intern | September-December 2025
Completed programming tasks as part of a development team, prepared technical documentation, and collaborated on
the team’s ongoing work.

AI/ML PROJECTS
AI Docs Agent - RAG assistant for document search
Python, SQLite FTS5/BM25, LLM tool calling, GitHub Actions
• Built an assistant that searches course materials and generates answers grounded in retrieved passages with source
citations.
• Compared its search with manual lookup: search time was approximately 40% shorter; testing on a small synthetic corpus
returned 19/19 top-3 hits (hit@3).
github.com/ta56419/ai-docs-agent
Customer Churn ML Platform - prediction pipeline and API
Python, pandas, scikit-learn, FastAPI
• Prepared a modular template for ML experiments with data validation, preprocessing, and repeatable evaluation; my
measurement showed approximately 30% less time to prepare subsequent models.
• Evaluated on a holdout set of 200/800 synthetic records: ROC-AUC 74.38%, recall 81.93%, precision 58.62%.
github.com/ta56419/customer-churn-ml-platform
LLM Eval Security Lab - LLM evaluation and security
Python, response evaluation, prompt injection, JSON reports, CI
• Automated checks for citations, source grounding, refusals, and prompt-injection resistance; tested in a university student
research group.
• Compared automated and manual audits: tests for basic vulnerabilities reduced audit time by over 50%; outputs JSON
reports for CI/CD.
github.com/ta56419/llm-eval-security-lab

I consent to the processing of my personal data for recruitment purposes in accordance with applicable laws.

Andrii Tynskyi JUNIOR AI & SOFTWARE ENGINEER | github.com/ta56419

SELECTED SOFTWARE PROJECTS
PlusFlix - movie catalogue web application
PHP 8, custom MVC framework, MySQL, Docker, LESS CSS
• Built a full-stack app for browsing and filtering movies, reviews, favourites, and an administrator panel.
• Designed a custom MVC framework with routing and an ActiveRecord ORM; configured Docker Compose and SQL
migrations.
• Compared performance before and after optimizing MySQL indexes and ORM queries: search results pages loaded
approximately 25% faster.
github.com/ta56419/plusflix
Multikino REST API - cinema ticket booking system
Spring Boot 3.2, Java 17, JPA/Hibernate, H2/MySQL, JUnit, Postman
• Implemented a REST API with 20+ endpoints using a Controller → Service → Repository architecture.
• Added booking validation and protection against double booking; prepared JUnit 5 and Mockito tests and Postman
documentation.
github.com/ta56419/multikino-rest-api
WiWav - IoT project at PUTCyberDays hackathon
C++, PlatformIO, Bluetooth/NFC/RF/Wi-Fi, PCB design
• Built a prototype that scans BT, NFC, RF, and Wi-Fi signals, with a web server, display support, and a PCB schematic.
• Compared detection before and after optimizing C++ code and interrupt handling: nearby-device detection was
approximately 30% faster.
github.com/ta56419/WiWav
AB-Fit - gym management app
Android, Java, Firebase, XML
• Designed an app for managing a gym, subscriptions, payments, and workout statistics; integrated Firebase and prepared
functional test scenarios and documentation.
github.com/ta56419/ab-fit
SIYS - Start Improving Yourself
Android, Java, XML
• Designed a mobile app for planning goals, reminders, and relaxation techniques.
Smart Home Lighting System
Arduino, mobile app, sensors
• Built a smart-lighting prototype with motion, temperature, and light sensors and remote control.
Lazior Rover Project
Autodesk Fusion 360, STM32 Nucleo, 3D printing
• Co-developed a rover: created 3D models, assembled the system, wired components, and tested motors.

EDUCATION
West Pomeranian University of Technology in Szczecin - B.Eng. in Computer Science (Information Systems Engineering) |
2023-present
Secondary School No. 91 in Lviv - graduated with honours, Gold Medal | 2023

COURSES, CERTIFICATES & ACTIVITIES
IBM Generative AI for Everyone - IBM SkillsBuild (certificate) | Elements of AI - University of Helsinki & MinnaLearn
(certificate)
Start IT Academy | Samsung IT School | PUTCyberDays 2026 (hackathon) | LeetCode / W3Schools (self-study)

LANGUAGES & ADDITIONAL INFORMATION
Ukrainian - native | English - B2 | Polish - B1/B2 | Driving licence: B, B1, AM | Szczecin / hybrid / remote

I consent to the processing of my personal data for recruitment purposes in accordance with applicable laws.