• Implemented a full reward processing flow for social media app with AWS SQS, AWS Lambda, Node.js, Nest.js, TypeScript, MySQL,Apollo GraphQL, GraphQL, Prisma, Nexus, which encourages users to make more purchases;

• Created accessible, well-optimized, responsive UI components for CRM system, to ensure seamless user experience on all modern browsers and devices using React, Next.js, Svelte, SvelteKit, Formik, React Query, FormatJS, Tailwind CSS, MUI, Ant Design,Styled-components;

• Participated in the internationalization of client-side utilizing FormatJS and server-side with AWS DynamoDB;• Code reviews, features estimating, planning, unit/component/e2e testing (using Jest, Testing Library, Cypress);

• Produced responsive, SEO-friendly pages, for a highly customizable website, using React, Next.js, Effector.js, Styled-components, CSS Modules, ensuring up to 15% conversion rate;

• Implemented client-side GDPR compliance, which is an integral requirement for the company's operation in the European market;

• Provided integration with Google Maps and Here Maps API;

• Developed a "Quick order" feature, that allows support operators to create orders saving up to 70% of the time;

• Integrated client-side with reCAPTCHA service to ensure protection against fraud and abuse;

• Created reusable and customizable UI kit, using JavaScript, Backbone.js, Marionette.js, jQuery, Chart.js, Less, CSS3, and HTML5;

• Developed “Reset password” functionality to achieve a better user experience and security;

• Implemented new front-end design for the “User management” module with Sencha Ext JS toolkit, CSS3, HTML5, optimizing requests and reducing the initial page load time by about 200 ms;

• Covered “User management” module with unit test, using Jasmine and Karma;

• Created CRM front-end from scratch, using Angular 8, TypeScript, RxJS, NgRx, Angular Material, Less, which provides authentication functionality, report generation (.pdf and .csv), and purchase filtering/sorting features;

• Developed applications server-side layer with Node.js and Express.js. Integrated it with the existing Firebase storage;