- Analysis of legacy code (practically without documentation and comments), identification of problematic blocks-Legacy code refactoring using all possible refactoring techniques (Red-green-factor, abstractions, fragmentation) - Rewriting the code using the principles of OOP- Development of modules for sending documents upon their release- Development of the Exchange EWS integration module (with support for email chains)- Development of a module for generating documents from a third-party developer's database (budget savings on paid software)- Development of a plug-in business process automation system based on ASP.NET Core 6.0

- Designed a distributed database of nomenclature for exchange with the necessary marketplaces (pgsql);- Set up periodic exchange with 1C via a csv file (not the best solution, but on the current configuration this is the best option) ;- Developed a "framework" for a client-server application for business process automation based on WCF, WPF mapping. With the help of reflections, I made the application modular;- List of modules: template file generation for marketplaces (3 pcs.);- Module for working with nomenclature tables;- Generation of a leftover file for the site on the Insales engine. In this case, in addition to simply filling in the plate from the database, I load the Price List from a third-party site (to download, you need to parse the html code);- Barcode generation via gs1rus api. SOAP is used;- Implemented a couple of dozen small applications to perform one-time tasks (loader and sorter of product photos, report generation, etc.)

From scratch, I opened an electronics repair service center, did almost everything:- Hardware repair of smartphones and laptops (including circuit reading, soldering of BGA chips, repair of display modules);- Purchase of components, goods, equipment;- Solving issues with problem clients;- Promotion and design of pages in social networks;- Search, reception and control of administrators' work.

I had the work of the entire IT department (support for 3 offices and a warehouse), in particular:- Search for suppliers and contractors. Conversation. Full control of delivery;- Organization of the work of system administrators;- Design, optimization and upgrade of the current network;- In his spare time, he studied the C# programming language and helped programmers develop CRM.The service included equipment:- 3 Mikrotik gateways with 2 providers in each and L2TP+IPSEC between them;- Zabbix monitoring system;- 5 D-Link L2 switches;- 3 firewalls on FreeBSD;- AD domain for 100 jobs;- Terminal server:- Postgresql database (about 50 GB):- OpenVPN VPN server;- Kaspersky antivirus for 100 workstations.- Full coverage with seamless WiFi roaming on Ubiquity equipment;- 100 workstations;- 5 analog video recorders;- SKUD Sphinx.