Sergey Lunev Email & Phone Number

Moscow City, Russia

- Re-architected a legacy Scala-based system to improve maintainability, throughput andscalability by implementing a microservices architecture- Built load-testing project with several core scenarios to identify bottlenecks using Gatling/Kotlin- Optimized performance, achieving a 300% increase in RPS by adopting Project Reactor andKotlin coroutines in a single application- Reduced memory usage by 10 times in memory-intensive requests by optimizing theapplication- Incorporated Mob Programming to increase business knowledge sharing and involvement alsoactively transferring expertise between team members- Rapidly dived into brand new domain and system architecture to help neighboring teamimplement new legal requirements- Created RESTful API from scratch to integrate payment services into SAP ERP, which made itpossible to attract large corporate clients- Cultivated usage of Feature Toggles to increase application stability and easy rollback- Conduct technical interviews and mentor junior colleagues.-

Moscow City, Russia

- Successfully designed and implemented e-commerce product catalog MVP using SpringBootand microservice architecture- Created efficient batch data loading process from file sources to product catalog- Implemented asynchronous data streaming from product catalog to storefront application toachieve real-time updates- Designed and implemented efficient way of dynamic product list searching taking into accountdata versioning, tenants and user filters using JPA CriteriaAPI reducing response time by 5times- Proactively developed several load-test cases to find bottlenecks and improve performance- Implemented several batch data loading processes from different file sources to unified bankdata store application which works with 800+ relational tables- Modernized existing batch data loading processes to shrink the upload job time by 10 times

Moscow City, Russia

- Developed several API integrations for B2B hotel booking aggregator using JSON and XMLover http and SOAP protocols- Enhanced data uploading process, reducing time by 50%- Implemented more than 300+ end-to-end test cases using Selenium