Sergey Bataev Email & Phone Number

Helsinki Metropolitan Area

As a leading Engineer in the team, I've managed key projects and mentored engineers, contributing to the company's growth and efficiency:Legacy Replacement:Designed and developed a microservice architecture to replace the legacy monolithic system, improving scalability and maintainability.Content Reuse Initiative:Streamlined preowned article metadata management, reducing manual effort and speeding up content deployment.Mentorship:Mentored mid-level engineers, fostering their professional growth and enhancing team effectiveness.

Helsinki, Southern Finland, Finland

Automated Article Onboarding System Implementation:Integrated an automation process for metadata verification, resulting in up to a 60% reduction in onboarding expenses without compromising content quality.Stack: Golang, k8s, AWS Cloudformation, Aurora, SNS, SQS, DynamoDB

Moscow, Moscow City, Russia

Avito is the largest classified and marketplace in Russia.It's the 3rd popular site in Russia and has #129 place on Alexa-rank in global internet engagement.As an Engineer working on the analytics platform, I contributed significantly to the clickstream project, which involved:In-house Fluentd Replacement:Designed and developed a custom daemon to collect events from services across multiple nodes, clusters, and data centers.Ensured resilience to databus unavailability and maintained analytics integrity at a 300k RPS pipeline.Monitoring and Event Search:Implemented event monitoring in the databus and enabled near-real-time event searching in the pipeline using ClickHouse.Stack: Golang, Postgresql, Clickhouse, lua, kubernetes, Kafka

I have contributed to several high-profile projects, which include:Lukoil Oil Well Monitoring System:Designed and developed a system to store, monitor, and enrich data from oil well sensors.Integrated an AI model to predict potential issues based on varying depths and soil conditions.Hotel Booking System:Collaborated on the development of a hotel booking system for a TMC client, enhancing the user experience and streamlining the booking process.WorldSkills Russia Support:Implemented new features and provided technical support for infrastructure, ensuring the seamless operation of the WorldSkills Russia platform.Stack: http (fasthttp, gin, chi), NSQ, GRPC, Redis, Postgresql (pgx), TimescaleDB, Kubernetes, tracing

Naberezhnye Chelny, Russia

Naberezhnye Chelny, Russia

Stack: Golang, Postgresql, Docker

Stack: Python, Postgresql, Golang

St Petersburg City, Russia

Develop a booking system, Stack: PHP, Mysql, SEO

SEO, Develop backend system for crawlers and reportsStack: PHP, Mysql, bash