Yandex is the largest tech company in CIS with 65M+ MAU.1. Developed ELT jobs from 20+ various services’ databases to RAW DWH layer in Yandex Tables (in-house Big data platform based on MapReduce) using Yandex Data Transfer (∼ Airbyte / Apache Sqoop) & Terraform as tools.Data Integration methods: (1) snapshot, (2) incremental snapshot, (3) CDCSource types: (1) Logbroker (in-house ∼ Kafka), (2) PostgreSQL, (3) MySQL, (4) Clickhouse, (5) YDB2. Jobs’ scheduling in Nirvana (in-house ∼Airflow)3. Maintaining and deploying DWH layers’ ETL pipelines using CI/CD approach with Arcadia (in-house ∼GitLab).4. Systematized incoming typical tasks’ requirements for DWH team and implemented complex Yandex Forms.It increased team’s working velocity in terms of story points by ↑10%5. Conducted 10+ code interviews & onboarded 3+ new engineers from intern to mid-level6. Designed and implemented features of DWH Data Platform with PythonStack: YTsaurus, YQL (Yandex alternative for SQL), Terraform, Kafka, Python