Denis Ovsienko - Software Engineer

Denis Ovsienko

Software Engineer

United Kingdom

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Summary

🤩

Rockstar

🎓

Top School

Denis Ovsienko is a seasoned software engineer with 23 years in IT, steeped in open source and systems-level work across Linux, networking, data centres, and automation. He is a long-standing maintainer and contributor to critical projects such as tcpdump/libpcap and RackTables, bringing deep expertise in packet parsing, protocol support (including IPv6 and experimental protocols), and back-end robustness. His toolset spans C, PHP, Python, shell scripting, SQL, git, CI, and Unix-like systems, complemented by practical experience in IT security, wireless networks and GIS. Denis combines low-level debugging and compilation fixes with higher-level feature work like port/VLAN management and schema evolution, demonstrating a rare full-stack operations-to-code perspective. Based in the UK, he pairs technical writing with hands-on engineering, often improving stability and data integrity in mature infrastructure projects. An understated strength is his ability to translate real-world network and data-centre realities into maintainable open-source code used by practitioners globally.

23 years of coding experience

Donec'kij Nacional'nij Tehnicnij Universitet

English, Russian, Ukrainian

Stackoverflow

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Github Skills (24)

mysql10

ip10

build-system10

c-programming10

c1110

decode10

networking10

decoding10

c1710

php10

ipv610

sql10

tcp10

packet-analysis10

decoder10

Programming languages (12)

HCLDockerfileJavaC++ShellJinjaCGherkin

Github contributions (5)

RackTables/racktables

Jul 2007 - Jan 2023

RackTables current development repository

Role in this project:

Back-end Developer

Contributions:4425 commits, 108 PRs, 706 pushes in 15 years 8 months

Contributions summary:Denis's contributions primarily focus on the enhancement and maintenance of the RackTables application's backend logic. They implemented and refined port and VLAN parsing code within the device configuration module, addressing format mismatches and improving overall code robustness. The user also resolved a PHP warning, updated database schemas, and contributed to the implementation of new features related to port management and the management of Cacti graphs. Furthermore, they addressed issues such as handling of invalid date input, demonstrating a focus on data integrity and system stability.

ipamminecraftdcim

the-tcpdump-group/tcpdump

Mar 2013 - Jan 2023

the TCPdump network dissector

Role in this project:

Back-end Developer

Contributions:60 reviews, 353 commits, 95 PRs in 10 years

Contributions summary:Denis primarily contributed to the development of the tcpdump network dissector. Their work included implementing features for IPv6 network protocols, decoding of new and experimental protocols like Babel and ZeroMQ. Additionally, the user was involved in fixing issues related to RIPv2 and in providing bounds checks to improve packet parsing integrity. Their efforts touched on various parts of the codebase, including the core dissector logic and protocol-specific modules.

bpfdissectorbsd-packet-filternetworkingwireshark

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