Oleksii

OLEKSII LYASHENKO
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Kyiv, Ukraine​

I am a Software Engineer with 2+ years of experience building scalable, high-performance
systems across Fintech, Blockchain, and AI sectors. My expertise lies in architecting robust
backend infrastructures and bridging the gap between complex logic and user-centric
frontend experiences.

●​ Languages: Python, Typescript, Rust(basic)
●​ Frameworks: FastAPI, Django, Vite
●​ DB: SQL, SQLite, PostgreSQL, Redis, RabbitMQ
●​ APIs: REST, GraphQL

Software Engineer - Brainsurge, 03/2025 - now

-​ AI-Powered Document Analysis: Architected a FastAPI and Supabase backend, integrating
Google Gemini for secure, asynchronous AI processing.
-​ Market Sentiment & Scraping System: Engineered a Python + FastAPI data platform that
continuously scrapes, normalizes, and scores real-time financial and social streams through
ML inference endpoints, delivering low-latency sentiment signals to downstream trading and
analytics services.
-​ RTB Management Platform: Developed a high-throughput FastAPI service to handle live
auction workflows, bid validation, and campaign optimization logic, supporting sub-second
bid decisions and powering a React operations dashboard for the Canadian ad market.
-​ Fuel Sector ML Predictive Model - KLO: Built a Python ML backend that runs batch feature
pipelines and LightGBM/RandomForest models over large loyalty and transaction datasets,
exposing scored outputs and segmentation files for CRM-driven campaign execution.
-​ E-commerce Order Automation - Print24: Architected a FastAPI backend using
PostgreSQL/LangGraph to orchestrate multi-step AI-driven order flows, integrate Gemini
multimodal analysis for PDFs/images, and sync deals and pricing in Bitrix24 CRM.

Python Developer - Banan.dev, 06/2023 - 07/2024

-​ Feature Engineering: Successfully developed and deployed 15+ advanced features for the
CRM, including secure authentication modules and a comprehensive user profile
management system.

Student - Mate academy, 08/2023 - 02/2024

-​ Python & Backend Fundamentals: Mastered Python core, OOP principles, algorithms, and
data structures while building a solid foundation in relational databases (PostgreSQL) and
server-side logic.
 -​ Full-Stack Development: Developed and maintained responsive web applications using JS,
React/Redux, and CSS/Sass, collaborating in an Agile environment with designers and
product managers to deliver production-ready features.

EDUCATION: Master’s degree, Public finance, KNUTE (2014-2019)
LANGUAGES: English - B1+, Ukraine - Native