Sergei Diachenko Email & Phone Number

- Developed an interactive educational platform with React, Redux, and TypeScript, which played a key role in securing a subsequent client contract.- Engineered WebSocket connections for dynamic data tracking, chat, and video calls.- Collaborated continuously to QA teams, analysts, and product owners across multiple departments to enhance product development outcomes.- Implemented user authentication using JWT tokens to ensure secure and efficient access control across the platform.- Developed adaptive and interactive UIs using Material UI and Bootstrap to create an attractive and responsive design.- Integrated third-party APIs, expanding functionality and improving user experience, which included personalization and adding new features.Achievements:- Built an intuitive interface using React and the React ecosystem, enhancing functionality and user experience, which increased user satisfaction by 50%- Integrated Redux for state management within the project, improving the application’s maintenance and scalability.- Integrated Stripe to manage one-time purchases and subscriptions, simplifying payment processes and boosting sales by 20%.

- Designed and developed a budgeting platform that empowered clients to achieve financial stability using the latest technologies of JavaScript, TypeScript, React, Node.js, Express, Nest.js, and PostgreSQL. Resulted in a 15% increase in annual revenue.- Optimized existing React components for enhanced performance and maintainability.- Conducted unit testing using Jest and React Testing Library, which led to a 60% reduction in bugs.- Contributed to the design of database structures, ensuring efficient and optimized interaction between server and user interfaces.- Integrated a file upload system to the user interface, making data handling smoother and improving user interaction.- Maintained high code quality and readability, actively utilizing the Git version control system and adhering to Agile and Scrum principles in team collaboration.Achievements:- Enhanced UI, leading to a 30% increase in user engagement based on testing feedback.- Built and managed server functions and APIs with Node.js and Express, improving performance andusing PostgreSQL and Sequelize for better data handling.

- Instructed students in basic and advanced chess strategies, improving their game understanding.- Encouraged analytical thinking and problem-solving through chess puzzles and games.- Coordinated in-school chess matches and local tournaments, boosting students’ practical experience.- Evaluated students' progress and tailored lessons to suit individual needs.

- Implemented and maintained the Scrum framework, ensuring proper application, removing obstacles, and supporting the team to achieve high productivity.- Managed the product backlog, ensuring transparency and prioritization of requirements to achieve product goals.- Organized and managed sprints, including sprint planning and daily stand-ups, to accomplish sprint objectives.- Facilitated sprint reviews and retrospectives, focusing on continuous process improvement and team effectiveness. Resulted in a 45% increase in team capacity.- Collaborated with Product Owners and stakeholders to define requirements and achieve maximum product value.- Utilized Kanban board for process transparency.- Used task trackers like Jira and Asana.- Worked with the team to identify and remove project progress impediments, resolved conflicts, improved communication, and fostered a harmonious work environment.