Sergey

Gubarev

• Spearheaded the development of ERP solutions, enhancing productivity, resource management, and data accuracy for clients. • Built reusable, responsive pages on frontend frameworks like Angular, React.js with Tailwind CSS, headless ui, etc. • Experience in building DApps using HTML, Java Script and Node.js and interact with Ethereum Blockchain by using web3.js/ethers.js /solana-web3 APIs and metamask. • Developing web-based applications in React.JS and storing the transactions in Ethereum Network using Solidity language. • Forking decentralized finance site(https://solend.fi) on Solana network - swap implementation using Solana Web3 and Jupiter SDK, web3 integration with smart contracts on Rust language. • Experienced with NFT marketplaces, DeFi/DApp development with token protocols (ERC20, ERC21, ERC721, ERC-1155, Opensea). • Participated in Agile development processes, including sprint planning, daily stand-ups, and retrospectives.

• Developed and maintained automated test suites using PHP Unit, Behat, and Selenium, ensuring code quality and reliability. • Architected and implemented microservices solutions using Laravel, Symfony, and Docker, enhancing system scalability and reliability. • Led the development of a complex web application using React.js, Redux, and TypeScript, resulting in a 30% increase in user engagement and a 20% improvement in performance. • Optimize database queries and improve overall system performance, resulting in a 20% reduction in response times. • Implement CI/CD pipelines to automate the deployment process and streamline software delivery. • Developed RESTful APIs and backend services with Java/Python & Node.js handling millions of requests per day. • Lead the design, development, and maintenance of complex PHP-based web applications and backend services. • Worked closely with frontend developers to integrate backend services with React & Angular user interfaces.

• Updated and redesigned company website, adding clean and responsive components using React on a Java & Node.js Backend (Spring Boot / Express) and Python/Django. • Experience in using build/deploy tools such as Jenkins, Docker and Kubernetes for Continuous Integration & Deployment for Microservices. • Performing Code Reviews and QA with the team, design reviews with the requirements. • Developed and implemented a credit scoring model that reduced default rates by 15%.Led a team that automated the loan approval process, reducing processing time by 30%. • Implemented a 'server less' architecture using API Gateway, Lambda, and Dynamo DB and deployed GCP, Azure based on FireBase. • Vast experience in building complex web user interfaces, a keen understanding of user interaction and design principles and standards. • Experienced using and creating RESTful APIs with Swagger. • Implemented all the components following Test-Driven Development (TDD) methodology using JUnit.

• Improved existing Java & Python RESTful APIs by adding more functionality and error handling capabilities based on Spring Framework. • Implemented all the components following Test-Driven Development (TDD) methodology using JUnit. • Lead Ecommerce product initiatives, recommend improvements, mentor and guide junior team members. • Good experience with Golang drivers to perform operations such as CRUD operations and writing complex queries with PostgreSQL, MySQL, Mongodb and Redis. • Improved data quality, system uptime by reporting statistics for data pipelines using Golang. • Developed the Ecommerce website using PHP, from initial concept to completion, custom coded the Shopify theme, designed and coded HTML templates. • Developed custom web application interfaces using HTML5 and CSS3 to meet the requirements of the client. • Responsible for architecting and executing solutions using JavaScript frameworks like React.js, Angular.js and Backbone.js.