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New York City, NY  PHONE NUMBER AVAILABLE  EMAIL AVAILABLE  LINKEDIN LINK AVAILABLE EXPERIENCEFreelance (Self employed) Apr 2023  PresentSenior Fullstack Engineer JavaScript (Available for Contracts) Node.js, React, Cloud-native Provided development and consulting services to five international clients such as Enovos.lu (Luxembourg), JayDevs.com (Lithuania), TradeZing.com (USA), LingSoft.fi (Finland), Steeltrace.co (Netherlands). Collaborated with cross-functional teams to build one large-scale application from scratch, developed one MVP-ready application, modernized three internal applications, and processed ongoing support for a single SaaS service. Reduced development time and costs on projects, saving hundreds of man-hours and tens of thousands of dollars.IBM Sep 2021  Mar 2023Senior Fullstack Software Engineer Node.js, React, TypeScript, Microservices, RabbitMQ, gRCP Led frontend development of 3 for a scalable internal eLearning platform. Created the user interface using React for a scalable, responsive eLearning platform, providing a seamless experience for thousands of IBM employees across regions. Reduced application maintenance costs by 12,000 USD - 17,000 USD by optimizing cloud database storage and enhancing the cloud microservices architecture, resulting in performance improvements and long-term cost efficiency. Introduced modular learning pathways. Designed a feature enabling personalized learning pathways based on user preferences and skills, boosting the platform's training completion rate. Implemented an advanced face and desktop video recording tool enabling hundreds of users and instructors to create video content directly in any modern web browser. Mentored and guided 3 junior engineers through weekly code reviews and knowledge-sharing sessions that improved code quality and reduced bugs in production. Adidas Jan 2018  Jun 2021Senior Fullstack Software Engineer TypeScript, Next.js, NestJS, MongoDB, Docker, Kubernetes Led a team of 5 people. Made integration and development of real-time inventory tracking and automated warehouse operations, improving order fulfillment speed by approximately 15% and reducing stock discrepancies. Improved a couple of key software components that optimized supply chain operations, including tracking shipments, automating order routing, and improving supplier coordination, leading to a reduction in delivery times. Led a monthly knowledge-sharing session focused on emerging technologies, inspiring junior engineers to adopt innovative solutions. The initiative resulted in 3 new project proposals from the junior team members. Zynga Feb 2014  Nov 2017Senior Software Engineer JavaScript, Node.js, PostgreSQL, AWS, Microservices Developed high-performance game backend services. Built scalable backend services to handle thousands of concurrent players across games, ensuring seamless game play and reliable server performance. Optimized game data storage. Worked on database optimization for player profiles, game states, and transactions, improving data retrieval speeds by 120% - 150% and reducing server load. Removed or upgraded outdated dependencies in over 11 microservices. Integrated either self-written code or similar third-party libraries.Leapsome May 2010  Oct 2013Software Engineer Java, JavaScript, MySQL, Nginx, Git, Jenkins Built and maintained a couple of backend services for Leapsomes core HR and performance management platform. Integrated automated testing and CI/CD pipelines, improving code quality and reducing deployment times from 5 hours to 35 minutes.IBA Group Aug 2009  May 2010Intern Java, Microsoft SQLServer, JUnit, Maven, Jenkins, Git, OOP Implemented new analytics and process mining features that provided deeper insights into business workflows, helping users identify bottlenecks with 2 times greater accuracy. Engaged in writing APIs for 2 modules of the application. EDUCATIONBelarusian State University Jul 2010Bachelor's degree, Mathematics and Computer Science SKILLS JavaScript, TypeScript React, Next.js,Tailwind Node.js, NestJS,Express.js PostgreSQL, SQL,Database design MongoDB, Redis TypeORM, Prisma Microservices,Docker, Kubernetes,PM2, Nginx, AWS RabbitMQ, NATS,Kafka, gRCP Distributed Systems,Cloud-nativeapplications RESTful API,GraphQL API,Socket.io Unit / integration /performance testing,Jest Git, GitFlow Authentication /authorization flows,OAuth, OpenID,Keycloak, RBAC Swagger, OpenAPI CI/CD, CircleCI,GitHub Actions,Terraform LoD, DRY, IoC,KISS, YAGNI SOLID, Designpatterns, Architecturalpatterns, OOP Agile, ScrumADDITIONAL Languages: English (Full professional proficiency). Position: Senior Full Stack JavaScript Developer Node.js, React, AWS, Microservices, Cloud-native. Volunteering: Animal Shelter Volunteer at tierschutzverein-muenchen.de (Jun 2016 - Aug 2016). Other: 10+ years of experience. Ready to start in 4 weeks.