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Kirill UserKU
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Kirill User

@kirilluser5

Backend software engineer at FNZ fixing production defects and building FastAPI services for a live learning app.

Czechia
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At FNZ, I debug C#/.NET business logic and SQL to resolve 20–30 production defects each month across three client platforms. I also investigate recurring issues to find root causes and write SQL automation scripts for repetitive analyst workflows.

At Lezoos, I built and maintained FastAPI REST services for a live iOS learning app. The services deliver courses, lessons, and vocabulary from PostgreSQL, and track learner progress; I also designed the multilingual course data model.

For my Scene Annotation App bachelor’s thesis, I built an iOS AR app that scans objects in 3D, gives real-time quality feedback, and exports segmented point clouds. Its Unity/C# client combines LiDAR depth with AI segmentation, while my Python FastAPI backend serves YOLO11 and FastSAM models over REST.

I also worked on university projects including a Laravel/PHP marketplace, C++ networking tools, a Python parser, and a C# .NET MAUI school information system. I earned a bachelor’s degree in Information Technology from Brno University of Technology, Faculty of Information Technology.

Experience

Work history, roles, and key accomplishments

FNZ logoFN
Current

Production Support Developer

Jul 2025 - Present (1 year 3 months)

Resolve 20–30 production defects per month across 3 client platforms by debugging C#/.NET business logic and shipping code fixes through Git and Azure DevOps. Find and fix root causes of recurring defects in C# code and SQL stored procedures, and reduce manual effort by writing SQL automation scripts.

LE

Backend Developer

Lezoos

Feb 2025 - Jan 2026 (11 months)

Built and maintained FastAPI REST services for a live App Store app, serving courses, lessons and vocabulary from PostgreSQL, containerised with Docker. Implemented server-side progress tracking and designed the PostgreSQL data model for multilingual course content.

Education

Degrees, certifications, and relevant coursework

Brno University of Technology logoBT

Brno University of Technology

Bachelor's degree (Bc.), Information Technology

2022 - 2026

Pursuing a Bachelor's degree in Information Technology, with coursework in algorithms, databases, computer networks, and software engineering.

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