Daniel Kozák
Senior Software Engineer at Gen™
Bratrušov, Central Moravia, Czechia
Summary
👤
Senior🎓
Top SchoolDaniel Kozák is a Senior Software Engineer with 26 years of experience, currently based in Central Moravia and focusing on backend systems, databases, and performance optimization. He is an active open-source contributor to the D language ecosystem, having improved the Phobos standard library and both D compilers (dmd and LDC) with bug fixes, performance work and expanded test coverage. His career spans embedded camera systems, web and network applications, and internal enterprise tooling at companies including Avast and Eurosat, reflecting hands-on full-stack backend expertise. Daniel blends low-level compiler and language-level improvements with practical database optimizations—evident from his work on TechEmpower benchmarks and prepared-statement PostgreSQL integrations. Comfortable in both product and systems contexts, he brings a pragmatically experimental mindset to solving correctness, interoperability and performance challenges. An interestingly consistent thread across his work is improving correctness through tests while squeezing measurable speedups out of core library routines.
26 years of coding experience
12 years of employment as a software developer
maturity, General Studies, maturity, General Studies at Gymnázium ŠumperkNothing at all, Information Technology, Nothing at all, Information Technology at Vysoké učení technické v Brně
English
Github Skills (26)
algorithms10
debug10
programming-language10
postgresql10
template-metaprogramming10
llvm10
testing10
dword10
standard-library10
compiler-compiler10
dt10
compiler10
type-conversion10
benchmark9
performance-monitor9
Programming languages (14)
Github contributions (5)
TechEmpower/FrameworkBenchmarks
Feb 2018 - Feb 2021
Source for the TechEmpower Framework Benchmarks project
Role in this project:
Backend Developer
Backend DeveloperContributions:6 commits, 10 PRs, 5 comments in 3 years
Contributions summary:Daniel primarily contributed to the D language implementations of the TechEmpower Framework Benchmarks. Their work involved upgrading Dlang compilers, integrating mir.random for performance improvements, and fixing compilation issues within existing D-based frameworks like vibed and hunt. The user also added a PostgreSQL test to the vibed framework and optimized database interactions, including the use of prepared statements for better efficiency.
techempowerframeworkbenchmarkperformancebenchmarks
dlang/phobos
Oct 2012 - Dec 2017
The standard library of the D programming language
Role in this project:Back-end Developer
Back-end DeveloperContributions:8 commits, 3 PRs, 5 comments in 5 years 3 months
Contributions summary:Daniel primarily contributed to the D programming language's standard library, Phobos. Their work involved fixing bugs related to the `bitfields` template, adding features such as `LetterCase` to `toHexString` and `to!`, and optimizing the performance of integral type to string conversion. They also refactored code within the `std.algorithm` and `std.encoding` modules, addressing performance issues in existing library functions.
c-programmingmetatype-conversionphoneticsglossary
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