I have 20 years of experience in software development, working solo, leading teams, managing projects.

• Full-stack web development.
• JavaScript front-ends.
• Python back-ends and APIs.
• Relational databases - PostgreSQL (the best one), Oracle, MS SQL Server.
• Integrating with 3rd party services, payment systems.
  
  Parallel computing.
  Using asynchronous (asyncio) libraries like aiohttp, asyncpg, SQLAlchemy.

Making software dealing with concurrent access to resources, where consistency, transaction isolation and security of data is of the highest importance.

Lots of experience with business-oriented software, business intelligence solutions (Essbase).
Created main transaction software for national lotteries - from scratch.
Experience with cryptocurrency wallets and specialized software.
Experience writing desktop applications.