Stefan Zhelev
Data Professional
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Work Experience

Period:
Oct 2025 - Apr 2026 (7 months)
Position:
Data Operations
Organization:
Data
Responsibilities:
Led the modernization of the data platform by migrating workloads from Docker to Kubernetes, introducing GitOps and Infrastructure as Code practices, and establishing a scalable, secure, and automated foundation for data operations.
Achievements:
Automated the deployment and management of 10+ platform services including Airflow, Vault, Harbor, Forgejo, Grafana, Nessie and Dremio; with dlt and dbt pipelines
Period:
Nov 2023 - Sep 2025 (1 year 11 months)
Position:
Data Engineering and Operations
Organization:
Data Analytics
Responsibilities:
Data Architecture, Data Operations
Achievements:
Introduced Claude Code to boost data team efficiency 3 times. Enforced software engineering best practices for reliable and predictable data delivery. Achieved 99% data availability during business hours.
Period:
Apr 2023 - Oct 2023 (7 months)
Position:
Business Intellignece Manager (1 direct report)
Organization:
Marketing and Sales
Responsibilities:
OKR Adoption, KPI Management, Data Lake Adoption
Achievements:
Implemented OKR framework transforming 5 departments' performance management. Modernized data infrastructure from warehouse to lakehouse architecture, enabling real-time analytics for Anti-Fraud, Sales, Account Management, Marketing, and BI teams.
Period:
Oct 2020 - Jul 2022 (1 year 10 months)
Position:
Senior Data Engineer (2 direct reports)
Organization:
Product Development
Responsibilities:
Data Integration, Datalake and Data Warehouse Architecture, Development, Deployment, Consistency
Achievements:
Built data warehouse solution laying the foundation for company-wide analytics. Integrated in-house and third-party platforms including Salesforce, Zendesk, Adjust, and Google Analytics to support operations and business growth, consistently achieving OKRs.
Period:
Jun 2018 - Jan 2020 (1 year 8 months)
Position:
Senior Data Analyst
Organization:
Digital Gambling
Responsibilities:
Daily ETL of critical data sources, delivery of daily and weekly reports, implementation of new data pipelines
Achievements:
Automated daily data processing for gambling operations reducing manual work by 80%. Completed a project for scaling the data infrastructure from MSSQL to Synapse Analytics, enabling data accessibility across the organization.
Period:
Sep 2016 - Oct 2017 (1 year 1 month)
Position:
Predictive Analytics and Reporting
Organization:
EMEA Predictive Analytics and Reporting
Responsibilities:
Delivery of SLA and process reports, ETL automation, predictive analytics development and maintenance
Achievements:
Pioneered machine learning implementation reducing ATM operational costs by $2M annually across the EMEA region.
Period:
Jul 2010 - Aug 2016 (6 years 2 months)
Position:
Service Level Management and Reporting
Organization:
Ericsson, H3G, Engie, GRDF, Datwyler accounts
Responsibilities:
Led performance management for telecommunications and energy sector clients, maintaining 99.8% SLA compliance.
Achievements:
Managed SLA reporting for Fortune 500 clients including Ericsson and Engie, consistently meeting 100% contractual obligations over 6 years. Automated reporting for enterprise clients reducing operational costs by 40% across multiple accounts.