Retention curve rebuild for a two-sided marketplace
Replaced a single monthly-active number with a cohorted curve model; leadership cut a $310K reactivation spend that was chasing already-churned users.
- BigQuery
- dbt
- Looker
00 — SANA VERGHESE / PORTFOLIO 2026
I turn messy
event logs into decisions
people actually make.
Senior data analyst with six years across marketplace, fintech, and healthtech teams. I build SQL models and BI dashboards that survive a schema migration, and I write the analysis that gets read in the meeting — not filed after it.
847,000
ROWS MODELED NIGHTLY IN DBT
$1.4M
ANNUAL SAVINGS SURFACED
01 — BY THE NUMBERS
23
DASHBOARDS SHIPPED TO PRODUCTION
6
YEARS IN ANALYTICS
41
A/B TESTS DESIGNED & CALLED
0.31s
MEDIAN QUERY LATENCY, EXEC LAYER
02 — SELECTED WORK
04 CASE STUDIES
Onboarding funnel instrumentation for a lending app
Re-specced 14 tracking events to survive a schema migration, then isolated a KYC step losing 22% of applicants. A copy fix recovered 6,800 completions per quarter.
- Amplitude
- SQL
- Event Design
Pricing experiment readout for a subscription team
Designed a Bayesian A/B test for a new annual plan, guarded against peeking, and shipped a decision doc that held: the 12% lift persisted three quarters later.
- Bayesian A/B
- Python
- Statsmodels
Single-screen operating review for a healthtech exec team
Consolidated nine scattered reports into one governed Power BI model with row-level security, cutting the Monday prep ritual from four hours to zero.
- Power BI
- DAX
- Data Modeling
03 — SQL & BI CAPABILITIES
SQL & warehousing
- —PostgreSQL, BigQuery, Snowflake
- —Window functions & CTEs at scale
- —dbt modeling, tests & docs
- —Query tuning & cost control
BI & visualization
- —Tableau, Power BI, Looker
- —LookML & DAX semantic layers
- —Metabase self-serve rollouts
- —Chart grammar & annotation
Analysis & method
- —Python (pandas, numpy)
- —Experiment design & A/B testing
- —Cohort & funnel analysis
- —Stakeholder decision docs
04 — CERTIFICATIONS
- 2025dbt Analytics Engineering CertificationDBT LABS
- 2024Power BI Data Analyst Associate (PL-300)MICROSOFT
- 2023Tableau Desktop SpecialistSALESFORCE
- 2022Professional Data Analytics CertificateGOOGLE
05 — WRITING
- MAR 26
Retention isn't a number, it's a curve
Why a single MAU figure hides the only signal that matters — and how to plot the curve your team will trust.
- JAN 26
Instrumenting events that survive a schema change
A checklist for naming, versioning, and testing tracking events so your dashboards don't quietly go dark.
- NOV 25
Why I stopped trusting the average
The distribution was skewed, the median told a different story, and the readout changed the roadmap.
06 — TESTIMONIALS
“Sana is the rare analyst who ends a meeting instead of extending it. She hands you the decision, not just the chart.”
“Our dashboards used to lie by accident. She rebuilt the models and now the whole team trusts the numbers again.”
07 — CONTACT / FOR RECRUITERS
Hiring for a data analyst? Skim this, then send a note.
Open to senior and lead analytics roles, remote or hybrid in the EU/UK. Typical reply time is under a day. Full CV and references available on request.
- LOCATION
- Lisbon, PT · UTC+0
- STATUS
- Available Q3 2026