Cybersecurity · Digital Forensics · Leadership

Security leadership grounded in technical depth.

Swedish cybersecurity leader, digital forensics expert, educator, and founder with over 25 years of professional experience. Background spanning penetration testing and digital forensics through to executive security roles, education, and product development. Regularly engaged as an expert witness by lawyers, prosecutors, and Swedish district and appeals courts.

27+
Years experience
27+
Years in security
Since 1999
Digital forensics
Jonathan James

Analytical problem-solver with a deep technical foundation.

Born 1981. Throughout a career spanning cybersecurity, digital forensics, security leadership, and education, I've worked across roles from developer and penetration tester to Chief Security Officer for an international fintech company. I'm experienced at translating complex technical realities into clear decisions for non-technical leadership teams.

During 20+ years in security, I've coordinated national incidents, recruited and led security teams in sensitive environments, and conducted risk assessments with deep technical analysis. Since 1999, I've actively worked in digital forensics, supporting law enforcement investigations both in Sweden and internationally.

My drive is making a difference — going the extra mile and delivering well-informed analysis. I have refined expertise in OSINT, threat analysis, and a deep technical understanding of adversarial methods and patterns.

Digital Forensics Incident Response Penetration Testing OSINT Threat Intelligence Security Architecture Expert Witness Reverse Engineering Malware Analysis Security Leadership

Selected roles

2023 – present
Head of Cybersecurity Architecture / Security Consultant
Nexer Cybersecurity AB
2020 – 2023
Security Consultant
LEVEL Security Group
Internal security, forensics (iPhone, Android, Windows), investigations (stalking, fraud), incident response.
2019 – present
Instructor — Adversary Tactics and Techniques
Företagsuniversitetet
Teaching adversary behaviour, nation-state operations, intelligence methodology.
2011 – present
Security Specialist & Founder
Areusecure AB
Advisory, background checks, forensics across all platforms, penetration testing, secure development.
2014 – 2015
Chief Security Officer (CSO)
Klarna AB
Global responsibility for IT, information, and physical security. Security operations, strategic planning, recruitment, incident handling.
2008 – 2013
Business Manager Security & Senior Security Specialist
Atea Sverige AB
Security testing, national competence leadership, advisory, penetration testing of critical systems.
1999 – 2002
Founder & CEO
Securito AB
One of Sweden's first IT security companies. Clients included Microsoft and Boss Media.
1997 – 1999
Creator of Cassandra / Cassandra Gold
Independent
Anti-trojan and backdoor detection software for Windows. Over 50,000 users.

Vulnerability research & bug bounties

Active in responsible disclosure and vulnerability research through leading bug bounty platforms.

Bugtraq · 1999

Early security advisory

Published on the Bugtraq mailing list — one of the premier security disclosure channels of its era.

Read on SecLists.org →
Latest venture · 2026

Perseus Technology

Recently founded Perseus Technology — building groundbreaking forensics and DFIR-oriented software. Specialist cybersecurity with forensic precision: digital forensics, incident response, wireless security research, and AI-driven security engineering.

perseustechnology.se →

Featured in

Another side of creativity

When I'm not working in security, I make music.

Continuous learning

2022

Security Protection

FHS — Swedish Defence University

2021

Behaviour Analysis

Paul Ekman Institute / EIA Group

2010

SANS FOR610

Reverse-Engineering Malware

2004 – 2008

Uppsala University

Political Science, Education, Law, Epistemology

2000

Reverse Engineering

DataRescue, Liège, Belgium

Public key

UID: Jonathan James <jj@jonathanj.com>
Type: ed25519 + cv25519
Expires: 2028-04-10
Fingerprint:
A7F9 922D 0481 DA04 5B22 0AA4 5238 132A E446 B6F4
Download public key WKD auto-discovery enabled

Get in touch

Phone
+46 72 327 9210
Languages
Swedish · English (native bilingual)