Valeriu Ohan
Software Engineer at Graphcore
United Kingdom
Summary
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Rockstar🎓
Top SchoolValeriu Ohan is a software engineer with nine years of experience specializing in high-performance backend systems and bioinformatics tooling. Based in the UK, he currently focuses on performance characterization for kernels and applications on Graphcore IPUs, bringing low-level optimization skills to ML hardware. His open-source contributions to flagship genomics projects like samtools, htslib, and bcftools show deep expertise in C, VCF parsing, index handling and robust file-format engineering. He has a strong academic foundation with a BSc/MSc in Computer Science and an additional MSc in Mathematical Modelling and Computation from DTU. Colleagues rely on him for careful bug fixes, core-library maintenance and measurable improvements to data-processing utilities. He combines systems-level rigour with a practical bent for shipping tools that handle large-scale sequencing data.
9 years of coding experience
MSc, Mathematical Modelling and Computation, MSc, Mathematical Modelling and Computation at Danmarks Tekniske UniversitetBSc + MSc, Computer Science, BSc + MSc, Computer Science at Universitatea „Politehnica” din București
Stackoverflow
61reputation
9kreached
2answers
0questions
Github Skills (23)
variants10
c1110
data-structure10
vcf-files10
c1710
bioinformatics10
data-structures10
algorithm9
algorithms9
fileio9
file-access9
file-handling9
file-processing9
develop7
build-system7
Programming languages (9)
Github contributions (5)
samtools/samtools
Jun 2017 - Sep 2021
Tools (written in C using htslib) for manipulating next-generation sequencing data
Role in this project:
Back-end Developer
Back-end DeveloperContributions:3 releases, 23 reviews, 117 commits in 4 years 3 months
Contributions summary:Valeriu primarily contributed to the core functionality of the samtools project, focusing on enhancements to the command-line tools for manipulating next-generation sequencing data. Their work involved modifying and improving the `bam_merge` and `bam_fastq` utilities, including adding support for features like merging with a BED file and filtering by flags. These changes improved the flexibility and efficiency of the tools. Furthermore, the user's contributions demonstrate a deep understanding of the project's codebase.
next-generationsequencing-datanext-generation-sequencinggenomicssequencing
samtools/htslib
Jun 2017 - Jul 2021
C library for high-throughput sequencing data formats
Role in this project:Back-end Developer
Back-end DeveloperContributions:5 releases, 20 reviews, 146 commits in 4 years 1 month
Contributions summary:Valeriu primarily contributed to the VCF parsing and processing capabilities within the htslib library. Their work included fixing bugs related to integer handling and out-of-range values within the VCF parsing routines. The user also implemented and integrated methods for identifying and manipulating header lines. They appear to be involved in core library maintenance and enhancements related to file format parsing and index handling.
c-plus-plusbioinformaticsbamcramsequencing-data
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