Developed a SaaS platform for checking and paying fines for companies with large fleets.The system has a microservice architecture, which allows you to develop and deploy parts of the platform independently, and also makes it more resilient to loads.The system is designed taking into account the large number of vehicles being checked. The entire infrastructure is deployed on Yandex Cloud.Kubernetes is used to automate the deployment, scaling and management of containerized applications.Initially, the system was written in PHP, but later, it was completely rewritten in Golang, because with the growth of the platform / clients, the overhead when using PHP increased significantly.Interaction interfaces implemented:- public REST API;- private gRPC for internal communication;- personal account of the company (implemented on nextjs); - administrative control panel;- partner office;- reports.As of 2023, the solution helps over 700 customers manage and pay their fines automatically.More than 500,000 vehicles are checked daily for fines.The system supports more than 20+ data sources.Billing ServiceIn 2023, I am creating a billing system for the needs of the platform, which will allow providing customers with a more flexible service billing system, as well as easier implementation of new services.

Developed the concept and layout of the interactive information panel.Visit Center is a unique project, the task of which is to simplify the search for information for city guests, improve the tourist image, unite companies operating in the tourism industry, and bring tourist, cultural, and event information to the masses at a new level.Developed a content management system for the interactive information panel.The system is written using PHP and the Symfony framework.The system consisted of an admin part, where administrators could manage content/ events, as well as a public part, with which users interacted on the panel.The information was stored on VPS servers, and the panel was connected via API to the server side.Offline display of information in the panel was implemented (in the absence of an Internet connection).An advertising display manager has been implemented (on the top screen).

Developed email marketing management solutions for internal use at Shopotam.ru (ex. Ebaytoday) serving more than 2 million users worldwide.The backend was written in PHP using the Symfony framework. The frontend was written in Twig.For fault tolerance and performance, a cluster of VPS with configured SMTP was deployed.The interaction took place using the RabbitMQ message broker, which guaranteed the delivery of messages to the sender and the redistribution of tasks when the senders were unavailable.The main data was stored in PostgreSQL, operational data in Redis.This solution:- significantly accelerated the sending of regular mailings to the entire user base (previously it took from several days to a week);- increased the company's revenue by 30%;- increased the conversion of mailings, as letters were delivered on a regular basis and at the right time;- made it possible to reduce the cost of html layout designers and designers, as an interactive letter designer was implemented;- allowed to work with mailings to different employees and departments of the company; - made it possible to avoid errors in mailings, as the functionality of test sending mailings to company employees was implemented;- made it possible to better understand our customers, as a mechanism for collecting statistics on sent mailings was implemented (opening letters, clicking on links from a letter, location, etc.);- allowed returning lost customers to the service, so the mechanism for sending transactional emails was implemented (for example, a message about an incomplete order of goods in the basket).After successful implementation in the main service of the company, this solution was extended to other services of the company, and public access was also opened for other companies (emailberry.ru).

Worked in the BI (Business Intelligence) division:- writing unit tests, functional and regression tests;- writing load tests;- writing PL/SQL scripts for checking the correctness of the work of ETL processes so that they meet the needs of the business model;- interaction with the development team