Mats Julian Olsen

Magic Wood, Germany

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Summary

🤩

Rockstar

Mats Olsen is Co-founder and CTO of Dune, a crypto data platform, bringing 12 years of experience building data-heavy backend systems. He pairs an MSc in Applied Mathematics with prior senior data science work to design performant analytics pipelines and materialized SQL views for complex DeFi protocols. An active open-source contributor, his work includes refactoring the search-index library for better maintainability and shaping Dune’s spellbook SQL views, plus contributions to Python utilities like addict. Based in Zug, Switzerland, he combines product-scale engineering and hands-on hacking with a practical focus on maintainability — and, as his GitHub hints, he might climb when not debugging queries.

12 years of coding experience

Github Skills (26)

javascript10

postgresql10

python10

object-oriented-programming10

data-structure10

dictionary10

javascripts10

sql10

data-structures10

protocols10

testing9

node-js9

unittesting9

unit-testing9

searching9

Programming languages (18)

MDXJavaCSSC++RustCPLpgSQLScala

Github contributions (5)

mewwts/addict

Dec 2014 - Nov 2020

The Python Dict that's better than heroin.

Role in this project:

Back-end Developer

Contributions:10 releases, 156 commits, 50 PRs in 6 years

Contributions summary:Mats primarily contributed to the development of the `addict` library, which provides a custom dictionary class with attribute-style access. They implemented the core logic for setting, getting, and deleting items using both attribute and item syntax. The user added functionality such as a deep copy mechanism, and the ability to prune empty or false-y values from the dictionary. The changes included updates to the `__init__` method, incorporating support for tuples, generators, and other data types.

pythonflaskpython-dictaddictpython3

duneanalytics/spellbook

Jan 2020 - Aug 2021

SQL views for Dune

Role in this project:

Back-end Developer & Database Engineer

Contributions:116 reviews, 103 commits, 315 PRs in 1 year 6 months

Contributions summary:Mats's contributions primarily involve creating and modifying SQL views for the Dune Analytics platform. Their work includes defining materialized views for various DeFi protocols, such as Gnosis Safe and Compound. The user also addressed issues like invalid byte array formats and added hardcoded where clauses to optimize query performance. They demonstrated an understanding of data modeling and database optimization techniques.

sqldatabasemysqldune

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