Description

If your team is losing hours to manual reports, struggling with unreliable data, or lacking clear dashboards - I can fix that end to end.

I'm a Data Analyst and BI Developer with 7+ years of experience in multinational corporate environments (Jacobs, UBS, Aon), delivering complete data solutions across finance, risk, and HR analytics domains. My work sits at the intersection of three areas:

▸ Power BI & DAX — I build semantic models, complex DAX measures (CALCULATE, context transition, time intelligence, iterators), star schema data models, row-level security, and fully deployed Power BI Service solutions. I connect to REST APIs, SQL databases, flat files, and web data connectors. I also optimise slow, bloated reports.

▸ Excel VBA & Automation — I design, build, and refactor Excel VBA applications for data import/export, file processing, automated reporting, and business workflow automation. I also develop Power Automate flows integrated with M365 services.

▸ ETL & Data Engineering — I design and implement end-to-end ETL pipelines using Alteryx, Power Query (M language), and VBA that transform raw, messy data into clean, report-ready datasets. I've consistently reduced manual reporting effort on production workflows.

What you can expect working with me:

✔ End-to-end delivery — I take projects from requirements to finished solution, independently

✔ Business-first thinking — I translate technical output into something stakeholders actually understand and use

✔ Clean, documented work — code that's maintainable, not just functional

✔ Remote-ready — 5+ years of fully remote project delivery in structured corporate environments

I work well on both short-turnaround tasks (fix this DAX measure, automate this report) and longer engagements (build a full BI solution from scratch). If you're not sure whether your project fits, just message me — I'm happy to look at the brief before we commit.

Languages

Polish
Native or bilingual
English
Fluent

Workplace preferences

Remote only

Primarily works remotely

Jacobs
BI Developer / Data Analyst
January 2020 - Today (6 years and 7 months)
Kraków, Poland
– Designing and delivering Power BI reports, dashboards, and semantic models — including complex DAX measures, time intelligence, and calculated columns — with a focus on accuracy, performance, and scalability.
– Developing and optimising DAX logic across a range of evaluation contexts (CALCULATE, filter manipulation, context transition, iterators) to support precise, business-aligned calculations.
– Building and maintaining relational data models (star schema, multi-table relationships, cardinality management) to ensure consistent, report-ready semantic layers.
– Connecting Power BI to diverse data sources including REST APIs, web data connectors, SQL databases, and flat file pipelines; transforming and shaping data using Power Query (M language).
– Publishing and managing reports via Power BI Service — including workspace configuration, row-level security (RLS) setup, and report performance optimisation.
– Defining and maintaining BI standards, naming conventions, and reusable component libraries to ensure consistency and reduce development overhead across reporting assets.
– Designing and delivering automated ETL and data preparation workflows (Alteryx, Power Query, VBA) to create reliable, report-ready datasets for business and financial reporting.
– Working directly with stakeholders to gather requirements, define KPIs, and translate business needs into clear, intuitive visualisations; delivering end-to-end BI projects independently, managing scope and timelines.
– Ensuring data accuracy through validation, reconciliation, and quality checks across multiple data sources, reducing manual reporting effort.
UBS,
Operational Risk Application Support
November 2017 - December 2019 (2 years and 1 month)
Kraków, Poland
– Analysing operational risk and control datasets to deliver recurring and ad hoc reports supporting business and risk stakeholders in a financial services environment.
– Developing and maintaining Excel-based analytical models and structured reports using advanced formulas and relational data structures.
– Automating reporting and data processing workflows using VBA, improving efficiency, accuracy, and turnaround time.
– Conducting data validation and quality checks to ensure integrity and reliability of risk reporting applications.
– Supporting business users by translating complex reporting and data issues into clear analytical solutions.
Aon,
Risk & Healthcare Administrator
April 2016 - October 2017 (1 year and 6 months)
Kraków, Poland
– Collecting, validating, and analysing operational and healthcare data to support financial and risk reporting for UK-based stakeholders and insurers.
– Preparing analytical reports, calculations, and summaries to support risk and healthcare decision-making processes.
– Maintaining accurate datasets through structured documentation and audit-ready process records.