Aljaž Eržen
Software Engineer at Tenzir
Ljubljana Metropolitan Area Slovenia
Summary
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Rockstar🎓
Top SchoolAljaž Eržen is a compiler developer with 11 years of software experience, currently building core compiler technology at EdgeDB from Ljubljana. He brings practical expertise in language design and static analysis, demonstrated through significant contributions to PRQL—a modern, pipelined SQL replacement—where he implemented CLI features, parsing/translation logic, aliasing, and improved error reporting. Previously he delivered production software at CALMS Air, blending systems thinking with hands-on engineering. A University of Ljubljana computer science graduate, he focuses on reliable tooling and developer-facing features that make complex transformations predictable and debuggable. Colleagues value his attention to compiler ergonomics and the pragmatic enhancements he introduces to improve user and developer workflows.
11 years of coding experience
5 years of employment as a software developer
Bachelor's degree Computer Science, Bachelor's degree Computer Science at University of Ljubljana, Faculty of Computer and Information ScienceVegova Ljubljana
English, Slovenian, German
Stackoverflow
439reputation
21kreached
13answers
7questions
Github Skills (16)
compiler-design10
rust10
parsing10
parse10
testing9
sql9
code-generation9
kotlin6
html6
nodejs6
typescript6
javascript6
postgresql6
android6
sequelizejs6
Programming languages (20)
Github contributions (5)
PRQL/prql
Mar 2022 - Jan 2023
PRQL is a modern language for transforming data — a simple, powerful, pipelined SQL replacement
Role in this project:
Back-end Developer
Back-end DeveloperContributions:586 reviews, 167 commits, 719 PRs in 10 months
Contributions summary:Aljaž primarily contributed to the development of the PRQL language and its compiler. This included implementing features such as the addition of CLI subcommands, integration of parsing and translation logic, and incorporating new features such as table and column aliasing. Additionally, the user worked on improving the static analysis capabilities, enhancing error reporting, and modifying the syntax.
prqlsqldatapipeline
aljazerzen/mongodb-typescript
Sep 2018 - Jan 2023
Hydrate MongoDB documents into TypeScript-defined objects
Contributions:1 review, 55 commits, 18 PRs in 4 years 4 months
mongodbtypescript
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