- Designing, building, testing, and maintaining the continuous integration and continuous delivery (CI/CD) process.- Building and maintaining environments: development, testing, production- Troubleshooting and resolving issues related to application development, deployment, and operations.- Managing the IT infrastructure, ensuring scalability and reliability.- Monitoring the availability of applications and infrastructure- Support of security requirements

-Maintenance and develop CI/CD processes on the project (Jenkins, Gitlab);-Troubleshooting issues with environments and with CI/CD pipelines;-Automatization daily tasks (environment upgrade);-Support of security requirements (configuration SAST/DAST/SIEM, threat analysis, patch management);-Migrated the main application between EPAM Clouds to the new platform (from EPAM-BY2/CentOS to EPAM-HU2/Ubuntu);-Preparing and maintenance of accompanying documentation;

Operation and support of the billing system.Automatization of processes.Installing system updates.Analysis of tasks from subscribers and employees.Support of marketing companies.Maintenance of accompanying documentation.Configuration of the monitoring system.Tools and technologies:Oracle PL/SQL, Git, GitLab, JIRA, Docker, Zabbix, Python

Data analysis to reduce the number of errors that occur even before they occur in the testing process:-clarification of requirements with business analysts;-discussion of fixes with developers;Automation of data completeness checks in source and target systems:-setting requirements;-creating a set of tests;-identification of problem areas, entering them into the tracking system;-analysis of test results;-optimization of test cases for changing infrastructure;-maintenance of test documentation.Maintenance and testing of the ETL process.Tools and technologies:MS SQL, PostgreSQL, Python, Git, Bitbucket, JIRA, Google Cloud Platform/GCP(gsutil, Storage, BigQuery, Logging, Dataflow), MS Office

Module support and maintenance responsible for the operation of the process of charging subscription fees, one-time charges, calculation of adjustments and carrying out on subscription fees.Support of the billing process after the billing company, error correction, consultancy, setting tasks in other units.Making reports to other departments (BI functions).Development in PL/SQL.Consulting and support of solutions in case of problems with previously supported systems and processes:- the process of transferring phone numbers between operators;- the system of settlements between operators for the traffic;- resource management system;- system of processing of errors of call records at various technical failures, accidents.Development and application of workarounds or temporary solutions for critical errors in the entrusted areas.Tools and technologies:OracleDB, SQL/PLSQL, billing system BSCS ix Release 3 Ericsson, Unix shells, ОS Windows, MS Office, Jira, Python.

(since 30.09.2016 specialist of the 1st category of group of billing operation, operation management).Support of the billing process after the billing.Resource management system support.Pairing software infrastructure of operator with telecommunications:- Mediation - operational tasks, work with call records (parsing erroneous call records, log file analysis);- Provisioning - operational tasks.Support for phone number portability process.Support the system of inter-operator settlements between operators for the traffic provided by them.Error handling system support:- analysis of the causes of errors, setting tasks for correction to other units;- the development of algorithms for automation, participate in the development of automation (SQL parts), development of reporting rules.Generate reports to other departments.Module support and maintenance responsible for the operation of the process of charging subscription fees, one-time charges, the calculation of the adjustments by subscription fees and carrying out.

Automating the process of working with resources (phone numbers, SIM cards, express payment cards):- return of numbers to the free pool after termination of the contract with the subscriber according to the requirements of the company's business logic;- automation the use of "dummy resources" (without the need to re-generate them);- the development and description of processes of generation and distribution eVoucher/Voucher;- development of the algorithm for automating the process of returning resources (phone numbers) to other operators-owners of these resources after termination of subscribers ' contracts in the operator's network Velcom;- preparation of instructions for other departments - the 1st, the 2nd support line, providing the necessary functionality for this;- development of modules for other departments to work with resources;- development of rules and methods of transition of the company from use different SIM card series for different number ranges to one.Support of the billing process after the billing:- checking and correcting invoices;- introduction of tariff zones - correctness of displaying positions in the account;- analysis of the problems of billing.The development and use of substitute or temporary solutions on critical errors in those areas.

(since 01.11.2013 specialist of the 2nd category of group of enterprise user support (HelpDesk)).Ensuring the proper level of work IT service internal users of the Company; registration of all user requests in the system «Remedy»; control the execution of applications; classification (the choice of category and degrees of criticality) and request routing and user requests; coordination of interaction of specialists of the IT Department; consultation of Users on work and setup of SOFTWARE; analysis of causes of incidents and incident detection having a common cause; remote administration; remote user support; software installation and support.

Ensuring proper technical operation and uninterrupted operation of electronic equipment; computer preparation for work, technical inspection of individual devices and units, control parameters and reliability of the equipment, test checks for the purpose of timely detection of malfunctions and their elimination; maintenance of office equipment, ensuring a healthy state and rational use, execution of the preventive and routine maintenance; complete set of workplaces, local network connection, software settings.

Control over the timeliness of tax payments; audit of taxpayer's financial documents; analysis of the results, application of penalties to violators of tax legislation; maintenance of statistical tax reporting.