Jan Janiczek - Senior Data Engineer

Jan Janiczek

Senior Data Engineer

Stockholm, Sweden

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Summary

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Senior

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Top School

Jan Janiczek is a Senior Data Engineer based in Stockholm with 11 years of experience building and productionizing ML and data platforms. He has a track record of migrating monolithic systems to cloud-native architectures, selecting databases (Postgres → Elasticsearch/Cassandra) and optimizing pipelines to unlock multi‑order-of-magnitude performance gains and sustain 20M+ events/day on modest hardware. At H&M he moved recommendation models from prototype to production across multiple use cases, and at Gravete he led end-to-end migrations to Google Cloud, Docker/Kubernetes, and added observability with Prometheus/InfluxDB/Grafana. Equally comfortable tuning SQL and crafting NLP, GIS and image-recognition pipelines, he blends hands-on engineering with small-team leadership and a pragmatic focus on measurable throughput and maintainability. An early career in linguistics and translation gives him a knack for cross-cultural communication and working with diverse data sources.

11 years of coding experience

9 years of employment as a software developer

one-year scholarship, Indonesian language and culture, one-year scholarship, Indonesian language and culture at Universitas Pasundan Bandung

Bachelor of Arts (B.A.), Linguistics and Information Science, 5 (A), Bachelor of Arts (B.A.), Linguistics and Information Science, 5 (A) at Uniwersytet im. Adama Mickiewicza w Poznaniu

Polish, English, Indonesian, German, Chinese, Russian, Swedish

Github Skills (9)

backend4

scale3

python3

gevent3

security3

cryptography3

encryption3

asyncio2

elasticsearch2

Programming languages (3)

C#GoPython

Github contributions (5)

Hattivat/hattivat.github.io

Feb 2017 - Feb 2020

Contributions:124 pushes, 1 branch in 3 years

Hattivat/SICP

Jun 2016 - Jan 2017

Contributions:114 pushes, 1 branch in 7 months

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