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Illia Ivashko Middle Python Backend Developer (Django)
[open contact info](look above in the "contact info" section) Lviv, Ukraine linkedin github @illia_python

PROFESSIONAL SUMMARY
Python Backend Engineer with 3+ years of commercial experience architecting scalable, high-concurrency web services and
asynchronous APIs. Strong expertise in FastAPI, Django, PostgreSQL, and Redis, with a focus on database query optimization
(indexing, N+1 elimination), connection pooling, and distributed task queues with Celery and RabbitMQ. Proven track record
deploying containerized microservices via Docker and maintaining reliable automated testing pipelines with pytest-asyncio and
respx.
WORK EXPERIENCE
Python Backend Engineer, UK Travel Tech Startup (NDA) 10/2025 - Present
Project Overview: Architected high-throughput asynchronous backend microservices integrated with core platform databases,
managing concurrent API requests with connection pooling and Redis caching.
Tech Stack: Python (Asyncio), FastAPI, SQLAlchemy (Async), PostgreSQL, Redis, Celery, Docker, AWS (EC2, S3), uv, Pytest.
• Event Loop & DB Connection Pools: Decoupled PostgreSQL database sessions (asyncpg/PgBouncer) from external API calls,
eliminating connection pool starvation across 100+ concurrent requests.
• Latency & Caching: Reduced p95 response times by 45% (from 1.2s to 380ms) by implementing Redis caching layers and optimizing
relational database queries across 100k+ records.
• Containerization & Testing: Built automated multi-stage Docker images and comprehensive pytest-asyncio suites with respx mocks,
ensuring reproducible CI deployments.
Python Backend Developer, Centum-D 01/2025 - 10/2025
Project Overview: Engineered multi-tenant SaaS backend services using Django Ninja and PostgreSQL, processing background
workflows with Celery and RabbitMQ.
Tech Stack: Python, Django Ninja, Pydantic v2, PostgreSQL, RabbitMQ, Celery, Redis SETNX, REST API, Rapyd API, Docker Compose,
Poetry.
• Multi-Tenant Architecture: Developed isolated schema-based PostgreSQL backends with Django Ninja and Pydantic v2, serving
OpenAPI-compliant REST endpoints with sub-120ms response times.
• Distributed Tasks & Idempotency: Built asynchronous billing workflows using Celery and RabbitMQ with Redis SETNX distributed locks,
guaranteeing zero duplicate transactions across 10k+ operations.
Python Developer, Appexoft 02/2024 - 01/2025
Project Overview: Developed commercial backend systems and data pipelines using Django, DRF, and relational databases
(PostgreSQL, MySQL), focusing on schema design and database optimization.
Tech Stack: Python, Django, DRF, PostgreSQL, MySQL, Redis, Kafka, Stripe API, Docker, Pytest.
• Database & Query Optimization: Optimized complex SQL queries in PostgreSQL and MySQL, eliminating N+1 bottlenecks and designing
composite B-Tree indexes to cut query latency by 45%.
• API Development & Integrations: Engineered robust RESTful APIs using Django REST Framework with Stripe payment webhooks and
automated background reconciliation tasks.
TECHNICAL SKILLS
Languages & Core Databases & Caching Infrastructure & DevOps
Python (Asyncio), Advanced SQL, PostgreSQL, MySQL, Redis (Caching & Docker, Docker Compose, AWS (EC2, S3),
Shell/Bash, RESTful APIs, OOP. Distributed Locks), Alembic. GitLab CI, GitHub Actions, uv.
Backend Frameworks Queues & Asynchronous Testing & Reliability
FastAPI, Django, Django REST Framework Celery, RabbitMQ, Redis SETNX, Background Pytest, pytest-asyncio, respx, Connection
(DRF), Django Ninja, Pydantic v2. Workers. Pooling, Structured Logging.

LANGUAGES
Ukrainian — Native | English — B2 (Upper-Intermediate)