Dimitrios Valsamaras

DevOps Engineer

Amadora, Lisbon, Portugal21 yrs 10 mos experience

Most Likely To SwitchHighly Stable

Key Highlights

Expert in mobile and platform security.
Numerous CVEs credited across major vendors.
Frequent speaker at top security conferences.

Stackforce AI infers this person is a Cybersecurity expert specializing in mobile security and vulnerability research.

Contact

Skills

Core Skills

Android DevelopmentThreat AnalysisArtificial Intelligence (ai)Reverse EngineeringProject ManagementPenetration TestingVulnerability AnalysisWeb DevelopmentSoftware DevelopmentNetwork Security

Other Skills

IDA ProMobile Application DevelopmentAndroid SDKMobile ApplicationsCyber Threat Intelligence (CTI)Microsoft AzureKusto Query Language (KQL)Python (Programming Language)Team ManagementManagementAndroidJavaLeadershipFirmwareTelecommunications

About

Dimitrios is a Senior Security Researcher specializing in mobile and platform security, with deep expertise in Android internals, reverse engineering, and exploit development. As part of Microsoft's Threat Intelligence organization, he conducts large-scale vulnerability research and malware analysis across mobile and cross-platform ecosystems. He has been credited with numerous CVEs across major vendors including Microsoft, Google, Samsung, Zoom, TikTok, Xiaomi, and others, consistently uncovering high-impact flaws in widely deployed software. His work focuses on breaking trust boundaries and turning small logic bugs into full exploit chains. At Pwn2Own Mobile, he used that same approach to compromise a Samsung flagship device on production firmware. Dimitrios builds offensive security tooling and has been active in reverse engineering communities since early in his career. A frequent speaker at Black Hat, Nullcon, Insomni’hack, Troopers, and Hack.lu, he is recognized for deeply technical research that connects vulnerability discovery with practical, real-world exploitation.

Experience

21 yrs 10 mos

Total Experience

3 yrs 7 mos

Average Tenure

4 yrs 5 mos

Current Experience

Microsoft

Senior Security Researcher (Microsoft Threat Intelligence)

Dec 2021 – Present · 4 yrs 5 mos · Lisbon, Portugal

Conduct malware and vulnerability research on mobile applications, focusing on identifying and analysing emerging threats.
Develop detection rules and algorithms for malware detection pipelines to enhance threat identification and prevention.
Perform cross-platform vulnerability assessments and malware research, targeting mobile, web, and desktop environments to ensure comprehensive security coverage.
Contribute to the discovery and mitigation of security flaws across various platforms, enhancing the overall resilience of Microsoft's security solutions.

Android DevelopmentThreat AnalysisSoftware DevelopmentIDA ProMobile Application DevelopmentArtificial Intelligence (AI)+5

Cognizant

Security Engineering Management

Jan 2020 – Dec 2021 · 1 yr 11 mos · Lisbon Metropolitan Area

Led malware investigations of mobile applications submitted to the Google Play Store.
Responded to security incidents reported by third-party researchers, ensuring swift resolution and maintaining high security standards on the platform.
Performed reverse engineering of mobile applications to uncover hidden vulnerabilities and malicious behaviours.
Developed tools to automate the investigation process, significantly enhancing efficiency and accuracy in malware detection.
Assisted trainers and Subject Matter Experts (SMEs) in identifying skill gaps and facilitating technical training sessions through well-structured training plans.
Oversaw technical deliverables for Engineers, Team Leads, SMEs, and Quality Control for Reverse Engineering (RE-QC), ensuring high-quality outputs.
Developed, implemented, and reviewed policies and procedures to enhance security and operational efficiency.

Reverse EngineeringProject ManagementAndroid DevelopmentPython (Programming Language)Team ManagementSoftware Development+7

Census s.a.

Security Consultant

Jun 2017 – Jan 2020 · 2 yrs 7 mos · Thessaloniki, Greece

Penetration testing (Web applications and Networks)
Red Teaming
Vulnerability Analysis
Reverse Engineering Mobile Applications and IoT devices
Malware analysis
Performing simulated attacks on computer systems and networks in order to identify, report and propose mitigation measures on identified security vulnerabilities.

FirmwareNetwork SecurityTelecommunicationsMobile ApplicationsPenetration TestingVulnerability Analysis

Freelancer

Web Developer

Oct 2014 – May 2017 · 2 yrs 7 mos · Nikiti, Greece

Developing websites and applications using web technologies (HTML, CSS, and JavaScript).

HTMLSoftware DevelopmentSoftware TestingJavaScriptCascading Style Sheets (CSS)Web Development

Ntua

Software Developer

May 2014 – Sep 2014 · 4 mos · Athens

Contributed to the updated and migration of Castalia (A computer system for stochastic simulation and forecasting of hydrologic processes).

Software DevelopmentSoftware TestingDelphi

Porto carras grand resort

Security Engineer (Network)

Jan 2002 – Jan 2012 · 10 yrs · Neos Marmaras

In charge for maintaining Firewalls, VPNs, Web and Email systems in the company's network.
Monitoring and logging security concerns and incidents in order to generate reports and track performance.
Maintaining physical and code environment to protect servers, switches, and entire information technology (IT) system.

Network SecurityNetworkingNetwork EngineeringCryptographyNetwork Design