Leander Neiss
Senior Software Engineer at DBOS, Inc.
Killingworth, United States
Summary
👤
Senior🎓
Top SchoolLeander Neiss is a Senior Software Engineer with 13 years of experience building full-stack systems and low-level, high-performance software across Python, TypeScript, C++ and Rust. He combines hands-on backend work—contributing to the Hyrise in-memory database and improving CSV import robustness—with product-focused frontend and UX improvements led as a full-stack tech lead. At OtterTune he reduced bugs by 45%, cut CI costs by over 40%, and led migrations enabling enterprise SSO, showing a knack for operational efficiency and scalable delivery. He founded a peer-matching platform for female entrepreneurs, implementing a timezone-aware matching algorithm and running a cohort that produced 150 lasting connections. Comfortable moving between research-grade performance tuning (30x multi-threaded gains on Hyrise benchmarks) and shipping user-facing features, he thrives in cross-functional teams and mentorship roles. Based in Killingworth, Leander blends systems-level curiosity with product-driven execution, often surfacing subtle data- and tooling-level improvements that accelerate teams.
13 years of coding experience
12 years of employment as a software developer
Master of Science - MS IT-Systems Engineering, Master of Science - MS IT-Systems Engineering at Hasso Plattner InstituteStudy Stay Master of Science - MS Software Engineering, Study Stay Master of Science - MS Software Engineering at University of Tartu
English, German
Github Skills (8)
csv-parsing10
databases10
csv-parse10
c-language10
cprogramming-language10
database10
refactor9
refactoring9
Programming languages (10)
Github contributions (5)
hyrise/hyrise
Jun 2017 - Mar 2019
Hyrise is a research in-memory database.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:60 commits, 49 PRs, 219 pushes in 1 year 9 months
Contributions summary:Leander made several commits that focused on refactoring the codebase by moving template code and implementations from .hpp to .cpp files. These changes involved moving operator implementations like TableScanImpl, IndexColumnScanImpl, JoinHashImpl, JoinNestedLoopAImpl, and SortImpl, along with applying autoformat changes. Further contributions centered around CSV import features, specifically allowing customization of CSV import parameters such as delimiters and separators, which included changes to the CsvNonRfcParser and CsvWriter. The user also made modifications related to handling string escaping within the CSV parser, highlighting their focus on data import and storage mechanisms.
memorycpphyrisesqlcolumn-store
lanice/gloperate
Sep 2015 - Sep 2016
Contributions:52 pushes, 10 branches in 1 year
cudacppc-librarygpucontrolling
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