- Developed three startups from scratch with a small agile fast-going team (E-workbook for state schools and universities, Groups lessons for kids, Homeschooling for kids)- Designed and implemented services for automatic groups and teacher search. Reduced lead time from 2 days to 1 minute- Improved infrastructure billing for in-house clients (development teams). Costs reduced by up to 50%- Designed and implemented a new in-house configuration management database (CMDB) project, data sync from HRM, Ansible, monitorings, etc. Got up to x50 speed in heavy requests- Developed in-house Service desk (~400 requests per day) with automated processing of infrastructure requests. Processing time reduced from 2 days to 10 seconds- Participated in migrating from Newrelic to in-house Elastic APM for application monitoring. Price reducerd 8 times

- A new version of the media portal for teachers from scratch, integrated with the old version and working in parallel- Email mailing list system with rich text redactor and distribution parameters- Integrated full-text search based on Sphinx Search- Installed and administered Gitlab, made CI with GitlabCI

- Performance optimizations for client and in background data processing (globally up to 50%, in some places x10-x50)- Lead integration with 1S (Russian SAP) project, interviewed accountants, collect requirements, create UML schemes- Migration of big legacy monolith from PHP 5.6 to 7.0

- Bachelor's thesis project - new billing system for Wi-Fi- Created Helpdesk and financial statistics projects