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Karolis Balsys

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Texas, United States

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Résumé

Jobs verified_user 0% verified
  • Andersen Lab
    Senior Full Stack Engineer
    Andersen Lab
    Apr 2022 - Sep 2025 (3 years 6 months)
    Developed a Healthcare telemedicine platform for remote patient consultations using React, Next.js, and TypeScript for a responsive frontend, and Nest.js for backend. Built microservices with Nest.js, improving modularity and reducing inter-service latency. Designed and optimized RESTful and GraphQL APIs, reducing response times by 40% through efficient database indexing and caching mechanisms including Redis, across PostgreSQL, MySQL, and MongoDB. Created reusable React components for the application and used props for single directional data flow. Managed global state using Redux Toolkit and optimized component re-renders with React Hooks. Upgraded Next.js from version 12 to 14.2 to resolve module conflicts present in the older version in
  • V
    Senior Software Engineer | API & Data Ingestion
    Visma Tech Lietuva
    Jan 2019 - Mar 2022 (3 years 3 months)
    Developed a global travel booking platform using Node.js for backend logic and React/TypeScript for a user-friendly frontend, supporting 8,000+ daily bookings and boosting retention by 28% through streamlined reservation flows. Implemented GraphQL and RESTful APIs, improving data retrieval efficiency by 35% and reducing API response times. Handled Real-time updates via WebSockets, SSE (Server-Sent Events), or API polling that are powered by Kafka on the Node.js backend. Used Storybook to create isolated UI components for rapid development and ensure consistent design across the platform. Created custom reusable UI components using Material-UI and Tailwind CSS, ensuring consistent styling across applications. Developed Single Page Applicatio
  • Multitude
    Full Stack Developer
    Multitude
    Jun 2016 - Dec 2018 (2 years 7 months)
    Built an e-commerce marketplace using the MERN stack (MongoDB, Express.js, React, Node.js) with TypeScript, developing RESTful APIs for backend product management and a responsive frontend with React and Redux-Saga. Built and maintained APIs, optimizing for performance and security, and ensuring seamless usability for both internal and external clients. Assisted with the migration of legacy systems to cloud-based infrastructure on GCP, ensuring minimal service interruption and leveraging cloud characteristics for efficiencies. Used jQuery for client-side scripting to enhance product filtering, ensuring compatibility with modern React components. Debugged JavaScript and CSS issues to improve user experience. Contributed to the application li
  • Multitude
    Software Developer Internship
    Multitude
    Aug 2015 - Jun 2016 (11 months)
    Contributed to a full-stack SaaS marketing analytics platform using Node.js for backend API development and React for interactive dashboards, collaborating with senior engineers in an Agile environment.
Education verified_user 0% verified
  • Vilnius University
    BSc in Computer Science
    Vilnius University
    Jan 2015 - Dec 2015 (1 year)