Julius De Bruijn - Founding Engineer at Twin

Julius De Bruijn

Founding Engineer at Twin

Berlin, Germany

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Summary

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Rockstar

🎓

Top School

Julius De Bruijn is a product-focused founding engineer with 11 years of experience and 8+ years specializing in Rust, shipping infrastructure and developer-experience products from research to production. He has been a core contributor to Prisma (supporting 12M+ weekly downloads) and authored the Tiberius SQL Server driver in Rust which has 3.3M downloads, demonstrating both deep systems expertise and large-scale open-source impact. At Grafbase he led the design and launch of the Nexus AI router, a PostgreSQL WASI connector, and an SDK with extensive docs and market-driven extensibility. Julius pioneered commercial async Rust work as early as 2016, building one of the first production systems on Tokio 0.1 and later powering high-throughput push infrastructure handling 100M+ daily notifications. He blends hands-on engineering, API and driver design, and technical writing to deliver end-to-end solutions that prioritize developer experience. Based in Berlin and active in OSS, he often pairs protocol-level engineering with product insight to close gaps left by incumbents like Hasura and Apollo Router.

11 years of coding experience

15 years of employment as a software developer

Aalto University

Stackoverflow

Stats

1reputation

0reached

1answer

0questions

Github Skills (26)

caching10

postgresql10

query-builder10

datatypes10

mysql10

databases10

user-authentication10

authentication10

sql-server10

sql10

query-engine10

rust10

relational-databases10

sql-database10

database10

Programming languages (23)

MDXJavaC++CSSJinjaRustCScala

Github contributions (5)

prisma/tiberius

Mar 2020 - Jan 2023

TDS 7.2+ (Microsoft SQL Server) driver for Rust

Role in this project:

Back-end Developer

Contributions:42 reviews, 372 commits, 248 PRs in 2 years 10 months

Contributions summary:Julius implemented core back-end functionality for the database driver, specifically focusing on handling SQL Server login authentication and implementing support for various data types within the TDS protocol. This included modifications to the connection process to handle different authentication methods and the addition of functionalities such as reading and writing of specific data types like `u8`, `i16`, `i32`, `i64`, `f32`, `f64`, strings, and `XmlData`. Furthermore, they improved code readability by addressing code style suggestions and fixing the handling of `TEXT` and `IMAGE` types.

sql-servermicrosoft-sql-serverrusttdssql

prisma/prisma-engines

Jan 2019 - Jan 2023

🚂 Engine components of Prisma ORM

Role in this project:

Back-end Developer

Contributions:1044 reviews, 1096 commits, 1043 PRs in 4 years

Contributions summary:Julius focused on modifying the query engine, adding new features and refining existing ones. They implemented the ability to get port information from environment variables for the query engine. Furthermore, they upgraded the Quaint library version, and added more features regarding data fetching from SQL.

prisma-ormprismarustgraphqltypescript

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