Jul 2022 – Oct 2024 · 2 yrs 3 mos · Cambridge, England, United Kingdom · On-site

• Worked at AWS S3 Index, a high-throughput distributed system overseeing object indexes WW. Contributed to multiple heavily trafficked services, handling 500M+ RPS across a network of 100K+ servers.
• Enhanced a streaming service performance by redistributing computing and network resources, decreasing streaming lag for consumers by 60%.
• Optimized Linux kernel parameters for a highly loaded request path service, resulting in 20x P99.9 performance boost and enabling 30% reduction in fleet size.
• Implemented a health check mechanism to monitor service progress and automatically deactivate instances in case of poor performance, reducing on-call ticket volume by 30%.
• Identified and resolved multiple longstanding critical issues including race conditions, service stability, and OpenJDK bugs, eliminating server-side issues from 10 per month to 0.
• Automated AWS region build process for a streaming service, reducing manual efforts by over 90%.
• Developed shared libraries including a nullability testing library and an object validation framework, reducing development time for corresponding actions by 90%.

Jan 2020 – Mar 2022 · 2 yrs 2 mos · On-site

• Contributed to the evolution of the new generation Insurance Policy Management system, leveraging cloud infrastructure and API-based architecture while adopting microservices principles, DDD, CQRS and Event Sourcing.
• Created a resilient business workflow management framework, reducing the time required for workflow implementation and testing by 80%.
• Architected a scalable reporting service for accountants, government agencies, and business users, enabling the generation of 10+ advanced reports with latency under 500 ms, a vast improvement from the multi-minute delays of the legacy system.
• Led design and implementation of critical business features like Policy renewal and Policy rewrite, improving common system functionality. Implementation included refactoring of 5+ microservices, resulting in simplifying domain model design and accelerating features delivery by 40%.
• Engineered a dynamic data tree building and validation feature, allowing the system to verify data sources for document generation against dynamic JSON schemas. Resulted in 0 customer-reported issues regarding incorrect document generation.
• Automated the deployment process to Azure cloud, resulting in 6x decrease in deployment time and accelerating time-to-market for new features.

Oct 2017 – Dec 2019 · 2 yrs 2 mos · On-site

• Led the decoupling project for the Insurance Policy management system, focusing on extracting the rating and underwriting components, transitioning the application to an API-based architecture.
• Managed technical and project requirements across 4 development teams, comprising ~15 developers.
• Conducted estimation and planning of 50+ development sprints to ensure timely delivery of project milestones.
• Enhanced creation infrastructure for user and technical documentation, leading to 3x reduction release notes preparation time.
• Introduced end-to-end testing automation, achieving 100% coverage of business use cases, and reducing regression testing time by 90%.
• Provided mentorship and guidance to 2 junior team members.
• Completed the project within the designated timeline, resulting in 100% increase of the customer base and positioning the system for future scalability and innovation.

May 2017 – Oct 2017 · 5 mos · On-site

• Guided the analysis and design of 2 intricate custom insurance rating/underwriting engines, resulting in the acquisition of 2 new clients.
• Recognized and addressed 10+ significant issues impacting clients, guaranteeing seamless and continuous operations.
• Organized and led 3+ learning meetups to enhance the team's knowledge regarding project estimating, development best practices and others.

Mar 2016 – May 2017 · 1 yr 2 mos · On-site

• Developed a customized new business workflow wizard step for the Insurance Policy Management system, ensuring compliance with regulatory requirements, leading to 30% increase in policies processed within regulatory guidelines.
• Identified and resolved high-impact issues affecting clients, resulting in 20% decrease in new bugs.

Sep 2014 – Mar 2016 · 1 yr 6 mos · On-site

• Designed and implemented a task management system based on Kanban principles, using the Microsoft Exchange Server, allowing 70% cost reduction on running third-party systems and 70% cut the average task update time.
• Integrated "Call from website" feature using Microsoft Skype for Business for the Web Consultant application, resulting in 40% time reduction in user issues resolution and 20% decrease in customer attrition.
• Successfully addressed multiple issues within the Contact Center Software application, resulting in 7x reduction in customer-facing problems and significantly enhancing the overall application stability.

Nov 2013 – Apr 2014 · 5 mos · Krasnoyarsk Krai, Russia · On-site

• Built Nightclub News App that aggregates news from 3+ datasources (RSS, social networks) and allows reading PDF magazines in user-friendly manner.