Piotr Sowiński

Contact me at:

GitHub profile: Ostrzyciel

Hi! I’m Piotr, co-founder and CTO of NeverBlink, where we build next-generation knowledge graph and neurosymbolic systems. We’ve created Jelly, a super-efficient RDF knowledge graph streaming protocol, with implementations for Apache Jena, RDF4J and rdflib. Check out the projects section or my GitHub profile, maybe you will find something useful there.

I’m also finishing my PhD at the Warsaw University of Technology, advised by Maria Ganzha. In 2024 I did a research visit at TU Berlin’s PICOM lab, under the supervision of Danh Le Phuoc. You can find out more about my research in the publications section.

Currently my R&D focus is on making knowledge graph (RDF) streaming systems more efficient and practical, which also happens to be the mission of NeverBlink. This includes: the RDF Stream Taxonomy, RiverBench – an open RDF streaming benchmark suite, and of course Jelly.

Oh, and do check out my blog, where I write about research, programming (Python, Scala…), technology, and a few other things.

Latest blog posts

Apr 01, 2025	Jelly and CBOR-LD: two flavors of binary RDF
Sep 08, 2024	Making Scala go fast: avoiding allocations
Aug 14, 2024	Python's data science ecosystem matures – the case of Polars

Selected publications

ESWC 2025

Representing and querying data tensors in RDF and SPARQL

Piotr Marciniak, Piotr Sowiński, and Maria Ganzha

arXiv preprint arXiv:2504.19224, accepted as a poster paper at European Semantic Web Conference (ESWC) 2025, 1–5 June, 2025, Portorož, Slovenia, 2025

DOI: 10.48550/arXiv.2504.19224

Awarded Paper PDF arXiv Code Poster Website Bib

Best Poster Award and the Dieter Fensel Visionary Award at ESWC 2025

@article{sowinski2025tensorrdf,
  title = {Representing and querying data tensors in RDF and SPARQL},
  author = {Marciniak, Piotr and Sowi{\'n}ski, Piotr and Ganzha, Maria},
  journal = {arXiv preprint arXiv:2504.19224, accepted as a poster paper at European Semantic Web Conference (ESWC) 2025, 1–5 June, 2025, Portorož, Slovenia},
  year = {2025},
  doi = {10.48550/arXiv.2504.19224},
}

EKAW 2024

Realizing a Collaborative RDF Benchmark Suite in Practice

Piotr Sowiński, and Maria Ganzha

arXiv preprint arXiv:2410.12965, presented as a demo paper at the 24th International Conference on Knowledge Engineering and Knowledge Management (EKAW 2024), 26–28 November 2024, Amsterdam, Netherlands, 2024

DOI: 10.48550/arXiv.2410.12965

Nominated Paper PDF arXiv Poster Website Bib

Nominated for the Best Poster and Demo Award

@article{sowinski2024realizing,
  title = {Realizing a Collaborative RDF Benchmark Suite in Practice},
  author = {Sowi{\'n}ski, Piotr and Ganzha, Maria},
  journal = {arXiv preprint arXiv:2410.12965, presented as a demo paper at the 24th International Conference on Knowledge Engineering and Knowledge Management (EKAW 2024), 26–28 November 2024, Amsterdam, Netherlands},
  year = {2024},
  doi = {10.48550/arXiv.2410.12965},
}

EAmSI 2024

Not All RDF is Created Equal: Investigating RDF Load Times on Resource-Constrained Devices

Piotr Sowiński, Anh Le-Tuan, Pawel Szmeja, and 1 more author

arXiv preprint arXiv:2406.16412, presented at Workshop “Edge AI meets swarm intelligence” 18 September 2024, Dubrovnik, Croatia, 2024

DOI: 10.48550/arXiv.2406.16412

Paper PDF arXiv Code Data Bib

@article{sowinski2024not,
  title = {Not All RDF is Created Equal: Investigating RDF Load Times on Resource-Constrained Devices},
  author = {Sowi{\'n}ski, Piotr and Le-Tuan, Anh and Szmeja, Pawel and Ganzha, Maria},
  journal = {arXiv preprint arXiv:2406.16412, presented at Workshop “Edge AI meets swarm intelligence” 18 September 2024, Dubrovnik, Croatia},
  year = {2024},
  doi = {10.48550/arXiv.2406.16412},
}

Electronics

RDF Stream Taxonomy: Systematizing RDF Stream Types in Research and Practice

Piotr Sowiński, Paweł Szmeja, Maria Ganzha, and 1 more author

Electronics, 2024

DOI: 10.3390/electronics13132558

Paper PDF Code Website Bib

@article{sowinski2024rdf,
  title = {RDF Stream Taxonomy: Systematizing RDF Stream Types in Research and Practice},
  author = {Sowi{\'n}ski, Piotr and Szmeja, Pawe{\l} and Ganzha, Maria and Paprzycki, Marcin},
  journal = {Electronics},
  volume = {13},
  number = {13},
  pages = {2558},
  year = {2024},
  publisher = {MDPI},
  doi = {10.3390/electronics13132558},
}

Sensors

Frugal Heart Rate Correction Method for Scalable Health and Safety Monitoring in Construction Sites

Piotr Sowiński, Kajetan Rachwał, Anastasiya Danilenka, and 7 more authors

Sensors, 2023

DOI: 10.3390/s23146464

Paper PDF Code Data Bib

@article{sowinski2023frugal,
  title = {Frugal Heart Rate Correction Method for Scalable Health and Safety Monitoring in Construction Sites},
  author = {Sowi{\'n}ski, Piotr and Rachwa{\l}, Kajetan and Danilenka, Anastasiya and Bogacka, Karolina and Kobus, Monika and D{\k{a}}browska, Anna and Paszkiewicz, Andrzej and Bolanowski, Marek and Ganzha, Maria and Paprzycki, Marcin},
  journal = {Sensors},
  volume = {23},
  number = {14},
  pages = {6464},
  year = {2023},
  publisher = {MDPI},
  doi = {10.3390/s23146464},
}

IEEE WF-IoT 2022

Efficient RDF streaming for the edge-cloud continuum

Piotr Sowiński, Katarzyna Wasielewska-Michniewska, Maria Ganzha, and 2 more authors

In 2022 IEEE 8th World Forum on Internet of Things (WF-IoT), 2022

DOI: 10.1109/WF-IoT54382.2022.10152225

Paper PDF arXiv Code Bib

@inproceedings{sowinski2022efficient,
  title = {Efficient RDF streaming for the edge-cloud continuum},
  author = {Sowi{\'n}ski, Piotr and Wasielewska-Michniewska, Katarzyna and Ganzha, Maria and Paprzycki, Marcin and others},
  booktitle = {2022 IEEE 8th World Forum on Internet of Things (WF-IoT)},
  pages = {1--8},
  year = {2022},
  organization = {IEEE},
  doi = {10.1109/WF-IoT54382.2022.10152225},
}