Михайло

MYKHAILO PSENKOV
Python Backend Engineer
Kyiv, Ukraine • [open contact info](look above in the "contact info" section) • [open contact info](look above in the "contact info" section) • Telegram: @leroygorn • github.com/leroygorn • [open contact info](look above in the "contact info" section)
psenkov-984978242

PROFESSIONAL SUMMARY
Python Backend Engineer with 4+ years of commercial experience in fintech and B2B platforms. Sole owner of a production
billing microservice — architecture, development, and operations — covering invoicing workflows and Xero-based financial
integration. Previously led a full fintech platform migration from PHP (Symfony) to Django. Strong in PostgreSQL query
optimization and async Python (FastAPI, Celery). Hands-on with the modern AI stack: PyTorch, Hugging Face, LLM fine-tuning
(LoRA), and model deployment on serverless GPU.

EXPERIENCE
Nexthop Pty Ltd — Python Developer Jul 2023 – Present
• Own the company’s billing microservice end-to-end — architecture, development, and production operations —
processing 800+ invoices/month (~A$1.2M annual billing volume) for 800+ client accounts.
• Cut report generation from ~5 min to ~1 min (5×) in Celery tasks aggregating data from the Xero API and 3 internal
microservices — query rewrites, indexing, N+1 elimination, and memory optimization under tight hardware constraints
(400 MHz CPU / 128 MB RAM).
• Moved DocuSign document processing into FastAPI background tasks, eliminating client-facing lag during long-running
operations.
• Designed and delivered 5 production microservices: B2B REST APIs and event-driven services built on Celery and Redis.
• Built a partner-facing REST API for internet service sales, integrated by 20 B2B partners; authored the external developer
documentation.
• Integrated and maintained enterprise services across projects: Xero (financial operations), DocuSign (digital documents),
Microsoft APIs.
• Worked with geospatial infrastructure data using PostGIS.
• Mentored 2 junior developers; established code review practices and internal development standards.
Stack: Python, FastAPI, Django, SQLAlchemy (async), Celery, PostgreSQL, PostGIS, Redis, Docker, AWS, Vue.js, pytest
Freelance — Python Developer May 2022 – Jul 2023
• Led a year-long migration of a fintech platform (1,000+ users) from PHP (Symfony) to Django, preserving core business
logic throughout the transition.
• Redesigned and optimized the ~50-table PostgreSQL schema for the migrated platform.
Stack: Python, Django, PostgreSQL, MySQL, Docker, Pandas, NumPy

SKILLS
• Backend: Python, FastAPI, Django, SQLAlchemy (async), Celery, REST API design, pytest
• Databases: PostgreSQL (query optimization, PostGIS), Redis, MySQL
• Infrastructure: Docker, AWS, DigitalOcean, GitHub Actions (CI/CD), Nginx, Caddy
• AI / ML: PyTorch, Hugging Face, scikit-learn, LLM fine-tuning (BERT, LoRA), Modal (serverless GPU deployment)
• Frontend: Vue 3, JavaScript
• Languages: English — B2 • Ukrainian — native

EDUCATION
Master of Cybersecurity — National Aviation University, Kyiv 2023 – 2025
Thesis: AI-based system for automated web application threat detection.
Bachelor of Cybersecurity — National Aviation University, Kyiv 2019 – 2023

COURSES & CERTIFICATIONS
• Machine Learning — Hillel IT School (Jan – Apr 2026) — 20/20 practical tasks, top-6 finish in a 30-student cohort.
Certificate: certificate.ithillel.ua/view/31891173
• Stanford CS231n — Deep Learning for Computer Vision (self-study): assignments completed, incl. UNet and DDPM
diffusion models implemented from scratch.
• PythonPro — Hillel IT School (2022) — top-2 finish in a 25-student cohort. Certificate: certificate.ithillel.ua/view/69166800