- I've participated as a full-stack engineer in the development of a comprehensive CRM system tailored for a developer company. I used TypeScript, for both the front and back end. I used Node.js and MSSQL for server-side operations and React.js for the user interface. Through collaborative efforts with the team, we successfully delivered a robust solution to streamline deal management processes, enhancing efficiency and productivity for the company.- I used D3.js and the Next.js framework to develop the web application to showcase analytic data derived from social statistics and big data sources. By harnessing the power of D3.js, I crafted interactive visualizations that provided insightful representations of complex data sets. These user-friendly visualizations enhanced data comprehension and accessibility for stakeholders at all levels of the organization.

- I’ve participated as a full-stack engineer on a corporate website redesign and migration from WordPress to React. I used Next.js, React for the front-end, and NodeJS and MongoDB for the backend (+server side rendering). The new stack allowed us to improve the website performance, faster page loading, and responsive design for mobile devices.- I utilized React, Redux, NodeJS, and PostgreSQL to create an internal tool for the sales dept. It helped us reduce data transfer speed between teams. We faced significant improvement in customer orders processing time. Also, it helped us implement analytic reports for other business-flows optimization.- I was a lead team member in developing a corporate VPN. I used Cisco ASA and Mikrotik routers and firewalls, Microsoft Active Directory, and AD CS to create L2TP-over-IPSEC, SSL VPN, and Cisco Anyconnect. We significantly improved security and data access speed. Also, it allowed us to provide a more affordable way of accessing data and internal communications for employees working from home in a time of pandemic COVID-19.

- I used C#, ASP.NET Core, EF Core, and MSSQL to create new REST API endpoints. I refactored the existing backend framework. I utilized React.js to create new UI components for an internal inventory management tool. As a result, we significantly improved application functionality and delivered the world's best users experience.- I used Avaya Aura® Communication Manager for SIP clients creation.- I set up Voice VLAN on a Cisco platform for setting up, auto-provisioning and updating sip-phones Avaya (J129 и J169). It helped us bind all branches into one communication hub.- I used HPE 3PAR StoreServ Management Console for data storage administration. So we received a new reliable and secured solution to store and process, and backup data.

- I used PHP for 3-d party APIs integration. Such as a payment gateway and shipping costs calculators. It helped us reduce the speed of orders processing and delivery time.- Also, I used HTML, CSS, jQuery to create responsive layouts for the website. With the help of that, we significantly improved users’ experience and delivered eCommerce features for all mobile users.

- I used HTML5+CSS3 and created layouts of new blocks for an e-commerce website's engine. It helped improve users' experience and increase conversion.- I've used PHP and MySQL to create a service for syncing warehouse stock data between CRM and the website's database. It helped us reduce costs for warehouse stocks database updates and improve the speed of orders processing.

- I used HTML and CSS to create new website layouts aligned with the photoshop mockups. Also, I used jQuery to implement user interactive UI elements.