Karol Bolgár

- Built and operate BigQuery warehouses with SQL transformation layers, scheduled jobs on Cloud Run and Cloud Scheduler, and alerting when a run fails
- Production ETL pipelines with Airbyte, n8n and custom Python, ingesting from 10+ heterogeneous sources including S3, Google Ads API, Meta, Microsoft Ads, product feeds and CRMs
- Docker-based server infrastructure on Hetzner with Nginx, Portainer

- BigQuery databases and data models supporting multi-client analytics across roughly 80 brands in SK, CZ, HU, RO, AT and DE
- Data pipelines in Python, scheduled and monitored, replacing manual reporting for marketing and account teams
- Server-side GTM implementations on first-party domains, custom templates and consent handling, including Consent Mode v2 rollouts
- Margin-based bidding: sending

- Designed and shipped an internal operations platform consolidating attendance data from three independent source systems into a single flow, with a capacity-planning layer on top
- Every edit written with an audit entry (user, timestamp, field, old and new value, reason) in one atomic transaction
- Role-based access across four permission tiers, GDPR anonymisation with hashing performed server-s

Provided data-driven marketing and analytics consulting for 10+ small and medium-sized companies.
Set up tracking and analytics infrastructure for client campaigns
Built automated reporting using Python and DataStudio
Optimized campaign performance through data analysis
Designed marketing strategies tailored to client needs with detailed performance reporting

- Configured enterprise tracking infrastructure including GTM, server-side GTM, Universal Analytics, and GA4
- Built custom analytics reports and dashboards in GA4 and Looker Studio for data-driven decision making
- Performed website performance analyses and delivered data-backed optimization recommendations

- Built automated reporting systems and campaign measurement frameworks using DataStudio and Python
- Implemented conversion tracking infrastructure using GTM across multiple advertising platforms
- Managed data-driven campaign optimization across Google Ads, Facebook Ads, and Microsoft Ads

Set up B2B campaigns on Google Ads, Microsoft Ads, Twitter Ads, and Facebook Ads.
Optimized campaign performance through data-driven strategies.
Analyzed campaign data to identify new client acquisition opportunities.

Structured and set up e-commerce campaigns.
Drafted and managed campaign budgets.
Optimized campaign performance for better ROI.