Hi, I'm
Sergei
Polianskii
Data architect and engineer in Stockholm. I build data platforms on Microsoft Fabric and Azure Databricks that teams can actually trust.
About
I've spent more than ten years turning messy data from many sources into clear, reliable products — mostly in healthcare, the public sector and large enterprises.
Today I design greenfield platforms on Microsoft Fabric and Azure Databricks: Lakehouse and medallion architectures, ETL/ELT pipelines, and Data Vault or dimensional models underneath it all. Lately I've been leaning hard into AI-assisted engineering.
I started out as a web developer in Saint Petersburg, grew into databases and team leadership, then brought all of that to Stockholm. I studied mathematics at Saint Petersburg State University, which probably explains why I like models that add up.
I work independently through my consultancy, Seppl. If you're building a data platform, I'm happy to talk.
Experience
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2025 – now
Data Architect ST1 Biogas
Leading the design of a greenfield Microsoft Fabric platform, from Lakehouse architecture to governed, business-ready data products, and building AI apps on top of that data.
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2025 – 2026
Data Architect Kommunal
Built a reliable, production-grade Microsoft Fabric data platform with DevOps at its core: CI/CD pipelines and automated deployments, so changes ship safely and often.
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2022 – 2026
Senior Data Engineer Aleris
Moved the data platform to a Lakehouse and built Data Vault models for insurance invoicing and revenue tracking at a leading Nordic healthcare provider.
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2020 – 2022
Data Engineer Praktikertjänst
Led a new Azure data warehouse for Sweden's largest private healthcare provider, automating ETL/ELT across 50+ daily sources.
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2019 – 2020
Data Engineer PwC
Data models and pipelines on Azure for financial services clients, plus executive Power BI reporting.
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2017 – 2020
Data Engineer Trafikförvaltningen
A real-time big data solution for Stockholm's public transport network.
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2014 – 2017
BI Consultant Kentor
Enterprise data warehouses and master data management for several client companies.
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2004 – 2014
Web developer to team lead National Satellite Company
From web development to leading the team behind core IT and BI systems at Russia's largest satellite TV provider.
Skills
Platforms
Modeling
Languages
Practice
AI
Certifications
- Microsoft Certified: Fabric Data Engineer
- Databricks Certified Data Engineer
- Certified Data Vault Data Modeler
- MCSA: SQL Server 2012/2014
Languages I speak
- Swedish fluent
- English fluent
- Russian native
Contact
Building a data platform, or untangling one?
sergei@seppl.se