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Alexandr Sech

@alexandrsech

Message

Senior Python engineer building high-throughput FastAPI/AsyncIO backend systems.

Belarus

Message

What I'm looking for

I’m looking for a Senior Python role where I can build scalable FastAPI/AsyncIO services, own migrations and testing, and work close to infrastructure (Docker/Kubernetes, CI/CD). I’m ready for relocation.

I’m a Senior Python Developer with 6+ years of Python and 10+ years in IT, focused on building reliable backend systems. I enjoy designing services where performance, correctness, and maintainability matter from day one.

At my current role (Forex Broker CRM, Trading platform), I worked with FastAPI + AsyncIO to increase throughput by 30%. I build data-driven features using SQLAlchemy 2.0 and Alembic for migrations, and I keep request handling robust with Pydantic validation and Dependency Injection (FastAPI Depends).

I’m strong on quality and automation: I wrote 200+ Pytest tests (fixtures, parametrize, mocking) and used Redis for caching plus Celery for background tasks. I also delivered real-time functionality with WebSocket for notifications.

For infrastructure and delivery, I work with Docker and Kubernetes (AWS EKS) and Rancher, and I’m comfortable with CI/CD tooling (GitLab Runner, GitHub Runner, Drone). I’ve also supported system modernization via refactoring legacy code and migration pipelines through Alembic on PostgreSQL.

Experience

Work history, roles, and key accomplishments

Current

Senior Python Developer

Current

Forex Broker CRM, Trading Platform

Jun 2022 - Present (4 years 1 month)

Develop and optimize a trading/CRM platform using FastAPI and AsyncIO, improving throughput by 30%. Build and maintain database migrations, validation, caching, background tasks, and real-time notifications.

Python fastAPI AsyncIO SQLAlchemy Alembic Pydantic Dependency Injection Pytest Redis Celery Docker Kubernetes Rancher Performance Optimization

Python Developer

CRM + Task-Tracking Platform

Jan 2022 - Jun 2022 (5 months)

Develop features for a CRM and task-tracking platform and integrate with third-party services. Optimize SQL queries to speed up reports by 2x and maintain CI/CD pipelines.

Python SQL Query Optimization Window Functions CI CD Third Party Integrations

Python Developer

Internal Data Processing System

Apr 2021 - Jan 2022 (9 months)

Refactor a legacy internal data processing system using type hints and Pydantic. Manage PostgreSQL schema changes via Alembic and improve quality with Pytest coverage.

Python Type Hints Pydantic Alembic PostgreSQL SQLAlchemy Pytest Refactoring