Yevgen Sergeichyk

Performance testing team. Implementing load test simulations for Peloton ride classes using Gatling framework and scaling it up to 100K users using Kubernetes and AWS.

Data Services Team, Security IdMaster Project. Highly scalable and available distributed application for security id translation. The system is capable of handling billions requests a day with a goal of handling hundreds of billion requests.

• Designing data model for PostgreSql and implementing Java API for quick lookup and transactional and idempotent updates. The API allows application to execute 3B id translations daily with average lookup time under a millisecond. New API allowed to scale Kafka consumer service from consuming 4M to 35M updates daily.
• Designing and implementing Java API for Redis Sentinel cluster: connection pooling, load balancing, DC affinity. The lib is used by more than 40 teams across Bloomberg and became part of Bloomberg Java-guild foundation.
• Designing and implementing java API for client side sharding for Redis: supports automatic resharding with constant hashing.
• Docker based integration tests
• Developing various testing tools on python

• Developing highly available and scalable platform for online ad bidding for DSP
• The platform implements different bidding strategies, including regression tree prediction models for bid optimization
• Build Hadoop MR infra for reporting jobs as well as jobs for training regression tree models

• Building cashflow reconciliation infrastructure (between GS and SPV)
• Implemented Private Security model screens for PFI trading desk
• Developing tools for tracking and managing clients reports and documentation for CLO trading desk

• Developing Web Services / REST API for Groupon Getaway Inventory/ Content/ Booking systems. Java, Redis, Memcached, MySql
• Groupon Getaway Project. Main orchestration service for all Groupon services. Implemented asynchronous programming model using Java Vortex framework

Windows 8.

• Developing standalone test Radius Server for Windows Hardware Certification Kit (WHCK). The server implemented major EAP authentication methods (PEAP MSCHAPV2, TTLS EAP MSCHAPV2 /PAP, CHAP, MSCHAP, MSCHAPv2) in full compliance with RFC. C++, C#
• Developing IPv6 server components for Virtual Network Emulator: DHCPv6 Server, DNS Server
• The components were used for test automation for Network Identification
  Components and Services in Windows 8 (NCSI, NLA). Used C# and Managed C++

Windows 7.

• Developing Health monitoring tool for the PNRP Seed server