Manabu Niseki
Engineer at n/a - currently unemployed
Tokyo, Japan
Summary
🤩
RockstarManabu Niseki is a seasoned engineer based in Tokyo with 14 years of hands-on experience specializing in backend systems and OSINT tooling. He is a prolific open-source contributor whose work spans full-stack browser extensions and backend threat-hunting platforms—key projects include Mitaka, the Mihari query aggregator, and Cortex analyzers that integrate services like urlscan.io, VirusTotal, Shodan, and GreyNoise. Manabu’s contributions show practical expertise in API integrations, data enrichment, ingestion pipelines, and code quality/refactoring, plus a knack for turning ad-hoc OSINT needs into reusable tooling. Comfortable across Python and web extension stacks, he focuses on reliable data processing, threat intelligence automation, and pragmatic feature delivery. Though currently between roles, his portfolio demonstrates a sustained commitment to improving security tooling and making complex threat data actionable.
14 years of coding experience
Github Skills (40)
apim10
javascript10
osi10
threat-hunting10
python10
analyzer10
browser-extension10
typescript10
chrome-extension10
chrome-app10
webpack10
security10
threat-intelligence10
api10
webpacker10
Programming languages (18)
Github contributions (5)
ninoseki/mihari
Apr 2019 - Jan 2023
A query aggregator for OSINT based threat hunting
Role in this project:
Back-end Developer
Back-end DeveloperContributions:89 releases, 1 review, 1108 commits in 3 years 9 months
Contributions summary:Manabu primarily worked on implementing features for a query aggregator focused on OSINT-based threat hunting. Their commits included creating and modifying files related to artifact handling, type checking, and the integration of third-party services like VirusTotal, Shodan, and GreyNoise. They also made changes to the rule management system and web app functionality.
threatthreat-huntingthreat-intelligenceosinthunting
ninoseki/mitaka
Feb 2018 - Jan 2023
A browser extension for OSINT search
Role in this project:Full-stack Developer
Full-stack DeveloperContributions:95 releases, 2 reviews, 1168 commits in 5 years
Contributions summary:Manabu's contributions primarily revolve around enhancing the functionality of the browser extension, "Mitaka." Their initial commit established a foundation, which was followed by a shift to the implementation of a context menu feature. This involved modifying the background scripts to enable searches and scans using the urlscan.io service. Furthermore, the user refactored the codebase by updating the webpack configuration and added a sanitize feature. They also added support for publicwww, urlquery, and various other services, along with the integration of a code quality tool.
browsersecuritybrowser-extensionthreat-intelligenceosint
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