Олександр

Oleksandr Nuzhyn
Python Backend Developer
[open contact info](look above in the "contact info" section) • @Fifty_Sanya • GitHub • Kyiv, Ukraine (Remote)

SUMMARY
Python Backend Developer with a strong foundation in building and deploying B2C SaaS
products from scratch. Hands-on experience in Django (DRF/Ninja), PostgreSQL, and Cloud
Infrastructure (GCP). Experienced in integrating LLMs and building custom RAG systems.
Recipient of the Google Cloud for Startups Grant. I am an autonomous engineer focused on
business goals, seeking a professional team to contribute to complex systems and improve
collaborative development processes.

TECHNICAL SKILLS
Backend: Python (Django, Django REST Framework, Django Ninja), RESTful API Design,
Microservices Architecture, Asynchronous Programming.
AI Implementation: RAG Pipelines (with Source Citations), LLM Integration (OpenAI,
Gemini, OpenRouter), Speech-to-Text (Local Whisper), Text-to-Speech (GCP TTS), Vector
Search.
Databases: PostgreSQL (Schema Design, Optimization), ChromaDB.
Cloud & DevOps: Google Cloud Platform (Cloud Run, Cloud SQL, Cloud Tasks, Cloud
Storage), Docker, Firebase, CI/CD basics.
Integrations: Payment Gateways (Stripe, Paddle, WayForPay, Telegram Stars), Telegram
Bot API, Telegram Mini Apps (TMA).

PROFESSIONAL EXPERIENCE
Founder & Lead Backend Engineer | Ervelus (B2C SaaS)
April 2025 – Present | https://t.me/ervelus_bot | https://ervelus.com

Product Evolution: Architected and scaled the platform from a classic web application
(Google Auth, Email) to a highly integrated application within the Telegram Mini App
ecosystem utilizing Telegram Stars for payments.

Backend Architecture: Designed and implemented a robust REST API using Django, DRF
and PostgreSQL.
AI Implementation: Integrated OpenAI and Gemini APIs for automated content generation.
Developed internal image processing and resizing services.
Infrastructure: Successfully applied for and received a Google for Startups Cloud Grant.
DevOps: Deployed and managed infrastructure on GCP using Cloud Run for containerized
backend, Cloud SQL for database management, Cloud Tasks for asynchronous background
job processing, and Firebase for hosting the client-side.
Payments: Integrated multiple payment providers including Paddle, WayForPay, and
Telegram Stars, managing complex webhook logic.
SIDE PROJECTS:
AI-Driven Document Search (RAG):
Engineered a full-cycle RAG pipeline using PyMuPDF for extraction, Gemini Embeddings,
and ChromaDB for vector storage.
Developed a chat interface that generates context-aware responses with precise page citations
and source metadata.
Voice AI Assistant (Windows Utility):
Developed a desktop utility with custom-trained wake-word detection for continuous
background monitoring.
Orchestrated a pipeline using local OpenAI Whisper (Speech-to-Text), Gemini API
(Reasoning), and Google Cloud TTS (Text-to-Speech) for real-time audio feedback.

EDUCATION
National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute".
Bachelor of Software Engineering | 2023 – 2027 (Expected)

LANGUAGES
English: B2 – Able to read technical documentation, write clear technical specs, and
communicate effectively in an async team environment.
Ukrainian: Native.