Open to Senior / Principal Analytics Engineer roles · Berlin & Poland & remote

Piotr Zawieja Analytics Engineer

If different teams disagree on the numbers,
the problem isn't data. It's trust.

I build systems that fix that — turning fragmented data into a single, reliable foundation for decision-making across the entire company.

8+ years in B2B SaaS  ·  Snowflake  ·  dbt  ·  End-to-end analytics systems  ·  Self-service data layers  ·  AI-assisted analytics

// background

Revenue data, at scale

I'm an Analytics Engineer specialising in revenue and GTM data for B2B SaaS. My work sits at the intersection of data engineering, analytics, and business intelligence — building the warehouse layer that finance, CS, and product teams rely on daily.

Across my career in B2B SaaS I've led CRM unification projects, rebuilt revenue data pipelines from the ground up, and shipped machine learning models into production CS workflows. I've owned Snowflake, dbt, Salesforce, and Tableau end-to-end across the whole revenue data lifecycle.

My current focus is integrating AI as a governed layer on top of warehouse assets — not replacing analytical rigour, but amplifying it with safer, auditable LLM tooling.

  • 8+ years in B2B SaaS analytics, primarily subscription/revenue data
  • Berlin-based, open to relocation to Warsaw/Kraków or fully remote internationally
  • Fluent in English; native Polish
  • Comfortable as individual contributor or technical lead
  • Domain focus: GTM & revenue analytics, customer retention, product usage, self-serve reporting

// technology

Core stack

Warehouse

Snowflake DuckDB BigQuery Postgres

Transformation

dbt Core dbt Cloud SQL

Languages

Python pandas SQLAlchemy scikit-learn

BI & Viz

Tableau Power BI Streamlit

Orchestration

Airflow dbt Cloud jobs GitHub Actions

Sources & AI

Salesforce Chargebee Claude API OpenAI

// open source work

Portfolio projects

// production impact

Selected achievements

Domain Impact Context
Revenue accuracy 12–15% customer overlap found 8–10% revenue overstatement corrected CRM data reconciliation across two product lines following a business integration. Identified customer overlap and corrected revenue double-counting in subscription data.
Pipeline performance 78 min → 7 min 91% reduction in CARR pipeline runtime Full rebuild of a subscription revenue pipeline — incremental materialisation, query restructuring, and partitioning strategy. Daily refresh completed well within business hours.
Churn ML model 86% accuracy · AUC-ROC 0.91 ~5% churn reduction in target segment XGBoost churn risk model built on warehouse-sourced features and deployed to production. Scored weekly per account; integrated into customer success tooling.
Data migration 100k+ records migrated Zero data loss, zero downtime Subscription data migration during a billing platform consolidation. Full validation suite run against source and destination before cutover; zero rollbacks required.
Reporting efficiency ~40% reduction in manual reporting time Standardised dbt models replacing ad-hoc analyst SQL across the reporting layer. Executive dashboards and recurring business reviews moved to self-serve certified extracts.
01

Single source of truth for revenue

Designed and implemented a unified revenue data platform that consolidated fragmented reporting logic into one trusted framework — enabling Finance, Revenue Operations, and leadership to work from consistent metric definitions.

02

Self-service analytics layer

Built a curated analytics layer that allowed business users to answer complex questions independently, without ad-hoc data requests. Improved accessibility, consistency, and governance of key business metrics across the organisation.

03

Data trust as a competitive advantage

Led data quality, reconciliation, and metric standardisation initiatives that moved organisations from conflicting reports and manual validation toward trusted, decision-ready data.

04

Modernised revenue analytics architecture

Designed scalable data models and transformation frameworks capable of supporting business growth while maintaining transparency, auditability, and reliability across the analytics stack.

05

Predictive customer intelligence

Developed customer analytics frameworks enabling teams to identify risk patterns, prioritise interventions, and shift from reactive to proactive business decisions.

06

Analytics through data product thinking

Introduced product-oriented approaches to analytics: ownership models, documentation standards, monitoring practices, and reusable assets — reducing operational complexity and improving adoption.

// current focus

Currently learning

LLM tool use & agents

Building governed AI layers on top of warehouse assets — intent routing, parameterised SQL templates, output validation.

dbt Mesh, contracts & semantic layer

Cross-project dependencies, model contracts, and the dbt semantic layer — unified metric definitions queryable across tools without duplicating logic.

Snowflake Cortex

Native ML functions, Cortex Analyst, and document AI for embedding AI directly into the warehouse layer.

Analytics engineering leadership

Principal-level skills: team enablement, data contracts as organisational boundaries, and analytics-as-a-product thinking.

// writing

Articles

// get in touch

Let's talk

What I'm looking for Senior or Principal Analytics Engineer roles where the work is hard, the data is messy, and there's a real engineering culture around how analytics gets built. B2B SaaS preferred — ideally subscription/revenue domain.

Warsaw or Kraków hybrid, or fully remote with a European team. Open to full-time, consulting, and freelance engagements.