Joosua Santasalo
Principal Threat Researcher
Helsinki Metropolitan Area Finland
Summary
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Rockstar🎓
Top SchoolJoosua Santasalo is a Principal Threat Researcher specializing in Identity Threat Detection & Response with over six years of focused experience defending enterprise cloud identity platforms. He architects Node.js/TypeScript detection services and policy-as-code pipelines that translate identity research into scalable, multi-tenant Entra ID/M365 detections and mitigations. A former Microsoft MVP and MSRC Most Valuable Researcher, he pairs deep Azure AD/AD FS expertise with hands-on engineering of Graph API integrations, CI/CD testing, and YAML-based conditional access policies. Joosua’s background spans consultancy and productized research—he’s equally comfortable running rapid prototypes to prove attack classes as he is operationalizing them in XDR/SIEM environments. Based in Helsinki, he quietly blends developer pragmatism with public-facing security research and responsible disclosure.
6 years of coding experience
9 years of employment as a software developer
Vocational Qualification in Business Information Technology, Business technology, Vocational Qualification in Business Information Technology, Business technology at Omnia Vocational Qualification in Business Information TechnologyReserve Officer School, RUK
Github Skills (34)
entra10
azure-active-directory10
azuread9
llm9
llama9
mistral9
golang9
appid9
go9
ollama9
minimax9
gpt8
gemma8
glm8
devops7
Programming languages (4)
Github contributions (5)
jsa2/kql
May 2022 - Dec 2022
KQL for Azure Resource Manager and AppID search
Contributions:16 commits, 73 pushes, 1 branch in 6 months
appidazure-resource-managerkql
jsa2/AADAppAudit
Apr 2023 - Aug 2024
Microsoft Entra ID App Audit Solution (AADAppAudit)
Contributions:1 review, 12 PRs, 36 pushes in 1 year 4 months
entra
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