For US marketing agencies

Tracking and analytics. Installed properly.

I'm a senior analytics engineer. Agencies hire me for the technical half of the work. The tracking their clients can't get right, and the analytics their clients can't read. End to end, documented, handed back ready.

Book a 30-min intro call → See what I do

TZ CET, overlaps US ET 09 to 13 Status Booking Q4 2026

Marcin Mas Senior Analytics Engineer

What I can help your company with

Tracking

Plan, install, configure. Every event, every conversion, every environment, wired up and QA'd against real ad spend.

Tracking plan DataLayer spec GA4 setup GTM containers Google Ads conversions Meta Pixel + CAPI Amplitude Mixpanel Dev / staging / prod Traffic filtering Tracking audits

Tools

GA4

GTM

Google Ads

Analytics & BigData

Reporting, attribution, insight. Dashboards your client opens once and actually trusts. Plus the warehouse layer underneath if it's missing.

Marketing attribution Channel ROI / ROAS Cohort analysis Retention & funnels Custom reports Reporting automation Looker dashboards Data warehouse Semantic layer

Tools

Looker Studio

Looker

BigQuery

dbt

Eight years shipping data for SaaS, including

ASTOR

I build the technical half of the analytics your agency sells.

Background

Started in data engineering in 2018 at intive / BLStream. Spent four years at NapoleonCat as the sole owner of the data function for a SaaS serving 6,000+ customers: 175+ dbt models, 11 data sources, full marketing-attribution pipeline from website tracking through ad channels to Salesforce campaigns and ROI.

Independent B2B contractor since 2023. Recent flagship: a Redshift to BigQuery + dbt migration an external vendor quoted at $100k, shipped for 1/10th the cost, 1,500+ models, full data parity confirmed end to end.

How I work

"Most agency tracking I see is half-installed. I show up, install it properly, document it, and hand it back. You stay in front of the client."

I QA against real ad spend, so we don't ship tracking that hasn't matched a Google Ads or Meta conversion to a real warehouse row. Every engagement ends with a plain-English runbook your account manager can read out without me on the call. CliftonStrengths: Strategic, Analytical, Achiever.

Tracking that actually works.
Analytics your client trusts.

Hourly for audits and second opinions. Project (typically 2 to 6 weeks) for a full tracking install. Fractional retainer if your roster of clients needs a permanent technical brain on call.

Book a call →