Ihor Harahatyi, Developer in Szczecin, Poland
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Ihor Harahatyi

Verified Expert  in Engineering

Software Developer

Szczecin, Poland
Toptal Member Since
August 30, 2016

Ihor is a skilled Python developer who has worked on a number of projects, from websites to private cloud systems. His expertise ranges from algorithms to networking, multithreading, virtualization, and more. He enjoys participating in programming contests, and he is a great communicator.


Atom Cream
Amazon Web Services (AWS), Big Data, Docker, Management, Django, Python
Amazon Web Services (AWS), Dask, Docker, R, Python
Levi9 Ukraine
Scrum, Ansible, Terraform, HAProxy, Varnish, Django




Preferred Environment

Python, Docker, Linux

The most amazing...

...thing I've done is run my own service company, where I worked with many Python-related projects from various business domains.

Work Experience


2017 - PRESENT
Atom Cream
  • Managed technical vision and led the engineering team.
  • Worked with clients to solve their needs.
  • Created architecture for client projects as well as development infrastructure.
  • Reviewed code and mentored junior developers.
  • Created a Docker-based pipeline for projects.
  • Participated in architecture, management, and development of Django + React projects.
Technologies: Amazon Web Services (AWS), Big Data, Docker, Management, Django, Python

Application Architect

2018 - 2019
  • Integrated many independent third parties in one pipeline.
  • Built an SDK for econometrical projects.
  • Gathered requirements as well as created and documented architecture.
  • Built a platform for orchestrating Docker containers and deployed them to AWS via Ansible and Terraform.
  • Built a platform for integration of different services to build econometrical models and predictions using R/Julia and MixedModel for clients.
Technologies: Amazon Web Services (AWS), Dask, Docker, R, Python

Senior Software Engineer

2016 - 2017
Levi9 Ukraine
  • Working on the Netherlands' largest news website.
  • Contributed to architecture design and people management.
  • Deployed using AWS, Ansible, and Terraform.
  • Developed new features using Django (Django REST Framework).
  • Supported a legacy PHP-based CMS.
  • Collaborated with the Scrum team.
Technologies: Scrum, Ansible, Terraform, HAProxy, Varnish, Django

Executive Software Engineer

2014 - 2016
MediaSapiens GmbH
  • Developed various websites using Django framework. Contributed to team leadership and technical design.
  • Contributed to business analysis for a BI project.
  • Built the front end using React.
  • Worked on bookings, fintech, BI, and medical projects.
  • Built deployment pipelines using Ansible, Terraform, and Docker.
Technologies: Node.js, Docker, React, jQuery, Model View Controller (MVC), Django, Python

Software Engineer

2013 - 2014
  • Developed a secure file storage system for enterprise clients. Refactored different parts of the code. Improved security. Developed new features. Developed a Java applet for large file upload.
  • Refactored a legacy codebase.
  • Implemented a new way to work with the DB.
  • Worked with multithreading and async programming.
Technologies: PHP, AngularJS, Java, REST, Tornado, Python

Software Engineer

2011 - 2013
  • Developed a private cloud for a proprietary backup system. Implemented different modules of the system, refactoring parts of the custom framework.
  • Helped develop a driver for the CIFS network file system.
Technologies: REST API Architecture, Big Data, Multithreading, Networking, Python


An internally displaced persons aid portal, a charity project for the UN and the Ukrainian government. Web Development in Python, jQuery, and Django Framework.

React, Flux, ES6 and Problems We Met

A talk about REACT, Flux, and problems we met integrating this stack, given for SoftServe IT Weekend Kharkiv on 14.11.2015.


Python, JavaScript, SQL, C, Java, PHP, R


Redux, Django, Flux, AngularJS


React, REST APIs, Dask, jQuery, Node.js


DevOps, REST, REST API Architecture, Kanban, Scrum, Agile, Model View Controller (MVC), Management


Algorithms, Data Structures, Unix/Linux Virtualization, Tornado, HAProxy, Networking, Multithreading, Big Data


Ansible, Docker Compose, Varnish, Terraform


Linux, Docker, Amazon Web Services (AWS)


MySQL, PostgreSQL, MongoDB

2014 - 2016

Bachelor's Degree in Systems Programming

National Technical University: Kharkiv Polytechnic Institute - Kharkiv, Ukraine

2009 - 2015

Master's Degree in Applied Economics

Harkivs'kij Nacional'nij Universitet im. V.N. Karazina - Kharkiv, Ukraine

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