Adam Zieliński
Senior Data Engineer
Łódź, Poland · Europe/Warsaw (UTC+2) · 11 years of experience
Adam focuses on dependable data products with tested transformations, lineage, and freshness controls.
Request a shortlistWhy this profile fits
Trustworthy data products
Defines contracts, tests, ownership, lineage, and freshness expectations for data used by teams and models.
Scalable processing
Chooses batch, streaming, and storage patterns around volume, latency, recovery, and operating cost.
Operable pipelines
Designs idempotent jobs, backfills, alerting, and incident procedures rather than treating a successful first run as done.
Relevant toolkit
Python
dbt
Spark
AirflowDelivery evidence
Selected work
Marketplace Event Platform
online marketplaceDesigned and delivered a production data platform focused on streaming data platforms; sustained 1.8 million events per minute with replayable, schema-governed pipelines. The release included tested transformations, lineage, freshness SLOs, backfill procedures, and cost monitoring.
Schema Compatibility Service
online marketplace operationsBuilt the supporting control and measurement layer for the primary system, covering review queues, regression checks, operational visibility, and a documented handoff to the owning team.
Relevant experience
Career timeline
Senior Data Engineer
2023–PresentDevlyn client assignments · Remote
- Led streaming data platforms delivery for a online marketplace team and sustained 1.8 million events per minute with replayable, schema-governed pipelines.
Data Engineer
2015–2022online marketplace product company (confidential) · Łódź, Poland
- Built production systems in online marketplace, with increasing ownership of reliability, testing, and stakeholder delivery.
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Skill depth
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Relevant experience by skill
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Languages
Frameworks
Tools
Platforms
Storage
Paradigms
Credentials
Certifications
AWS Certified Data Engineer – Associate
Amazon Web Services · 2025 · Certified
Google Cloud Professional Data Engineer
Google Cloud · 2024 · Certified
Communication
Languages
English
Fluent
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