Даніла

DANILA CHETVERTNOV
PYTHON BACKEND DEVELOPER / TECH LEAD
📧 [open contact info](look above in the "contact info" section) 📱 [open contact info](look above in the "contact info" section) 💬 Telegram: @NoPaint 📍 Ukraine

PROFESSIONAL SUMMARY

Python Backend Developer with 6+ years of experience building, architecting, and scaling production systems,
serving as Tech Lead and mentor. Specialized in designing high-performance async architectures using FastAPI,
Asyncio, PostgreSQL, Redis, and Apache Kafka. Proven track record of delivering complex backend solutions
from scratch, guiding junior engineers, modernizing legacy codebases, and optimizing database performance
(reducing API latency from ~4s to under 1s).

TECHNICAL EXPERTISE

LANGUAGES & CORE FRAMEWORKS & WEB
Python (3.8–3.13), Asyncio, Asynchronous FastAPI, Aiohttp, Django (Basic), WebSockets, REST API
Programming, OOP Design

DATABASES & CACHING ARCHITECTURE & MESSAGING
PostgreSQL, Redis (Pub/Sub), MongoDB, Raw SQL & Microservices, Apache Kafka, System Design,
Index Optimization, SQLAlchemy, Peewee Distributed Systems, JWT Authentication

DEVOPS & CLOUD TESTING & INTEGRATIONS
Docker, Containerization, GitLab CI/CD, AWS S3, Linux Unit Testing (pytest), Payment Gateways, Third-Party
(Ubuntu) REST APIs, Telethon, Git

PROFESSIONAL EXPERIENCE

NIFLHEIM — Python Backend Developer / Tech Lead May 2025 – Jul 2026
Product & Architecture: Architected and engineered the backend from scratch for a high-load B2B Enterprise
ERP/CRM & Internal Social Platform designed to centralize business operations, communications, and workflows
for a market launch.
Engineering Leadership: Led a cross-functional team of 3 engineers (1 Middle, 2 Juniors); directed technical
roadmap, system design, task breakdown, code reviews, and mentored junior team members to boost delivery
efficiency.

Event-Driven Microservices: Built a scalable asynchronous microservices architecture using FastAPI and Apache
Kafka for inter-service messaging, ensuring high data consistency across CRM and communication modules.
Performance Engineering: Rewrote heavy relational SQL queries and optimized PostgreSQL indexing & Redis
caching strategies, reducing core API response latency from ~4s to under 1s.
Real-Time Communication Engine: Designed a high-throughput messaging engine and notification hub using
WebSockets paired with Redis Pub/Sub for instant event routing under peak loads.

Security & Infrastructure: Implemented fine-grained JWT/RBAC authorization, integrated third-party payment
gateways for billing workflows, automated AWS S3 asset handling, and containerized all microservices with
Docker.

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PROFESSIONAL EXPERIENCE (CONTINUED)

Dinamicka — Python Developer Feb 2025 – May 2025
End-to-End Ownership: Acted as the primary backend engineer in a cross-functional team, designing and
delivering backend architecture for 4 production systems from scratch.

Legacy Refactoring & Maintenance: Modernized, refactored, and brought to completion 4 existing legacy projects
inherited from previous engineering teams, significantly improving code maintainability, execution speed, and
service reliability.

High-Performance APIs: Developed scalable asynchronous REST APIs utilizing FastAPI and Aiohttp.
Database & CI/CD Setup: Designed data structures in PostgreSQL, Redis, and MongoDB. Established automated
CI/CD pipelines via GitLab and introduced unit testing practices.

Dicomas — Python Developer Oct 2021 – Sep 2024
Core API & Migration: Developed production backend APIs and successfully migrated a legacy Python codebase
from version 3.5 to modern Python 3.8+.

Payment Integrations: Integrated third-party payment gateways (Interkassa, AdvCash) and handled transaction
flows securely with high compliance standards.
Database Layer: Optimized PostgreSQL database queries and improved the ORM layer using Peewee to optimize
read/write performance.
Reliability & Testing: Containerized services with Docker, refactored core components for better reusability, and
wrote unit test suites to stabilize overall system performance.

Technical Engineer (L2/L3) / Support QA — Previous Roles Oct 2018 – Sep 2021
Handled advanced technical support, system diagnostics, quality assurance, and root cause analysis for
production software systems.

EDUCATION

National Aviation University Sep 2011 – Feb 2016
Department of Computer Science — Master's Degree in Computer Science

The Open University Business School Sep 2015 – Oct 2016
Master of Business Administration (MBA) - Stage 1 Course: B716 (Management: Perspectives and Practice)

Danila Chetvertnov — Curriculum Vitae Page 2 of 2