Perseus Technology Founder profile
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About the founder // Jonathan James

Security leadership grounded in engineering and investigation.

Swedish cybersecurity leader, forensic examiner, educator, and founder with over 27 years of professional experience. The career started early: as a teenager he traced virus writers for the FBI during the Melissa and Love Bug investigations at the turn of the millennium.

His background spans penetration testing and digital forensics through security architecture, executive roles, teaching, and product development. He is regularly engaged as an expert witness by lawyers, prosecutors, and Swedish district and appeals courts.

What sets the profile apart is the combination of technical depth and the ability to translate complex security questions into clear decision material.

Open CV (PDF, Swedish) jonathanj.com ↗
Portrait of Jonathan James
Jonathan James · Founder
27+Years in security
100+Vulnerability disclosures
1999Digital forensics since
50,000+Users, first product
01 // Selected roles

1997 → today.

Roles and engagements of particular relevance to Perseus Technology.

2026 — present
Founder, Perseus Technology
Forensic software and specialist services: Perseus Explorer, iPhone Backup Analyzer, and Detect.
2011 — present
Founder, Areusecure AB
Security advisory: background checks, digital forensics, penetration testing, and secure development.
2023 — 2026
Head of Cybersecurity Architecture, Nexer Cybersecurity AB
Senior architecture and advisory role focused on uniting technology, structure, and business-level decisions.
2020 — 2023
Security Consultant, LEVEL Security Group
Internal security, forensics on iPhone, Android, and Windows, plus investigations into stalking, fraud, and incident response.
2019 — Oct 2024
Instructor — adversary tactics and techniques, Företagsuniversitetet
Teaching threat actors, intelligence methodology, nation-state operations, and modern cyber threats.
2014 — 2015
Chief Security Officer, Klarna AB
Global responsibility for IT, information, and physical security, including incident handling.
2008 — 2013
Business Manager Security, Atea Sverige AB
Security testing, lectures, national competence leadership, and penetration testing of critical systems.
1999 — 2002
Founder & CEO, Securito AB
One of Sweden's early IT-security companies, with clients including Microsoft and Boss Media.
1997 — 1999
Creator of Cassandra / Cassandra Gold
Early anti-trojan software for Windows with over 50,000 users.
02 // Areas of expertise

At the intersection of engineering, forensics, and judgement.

Digital forensics and technical investigations

Android, iOS, Windows, macOS, and Linux. Support for criminal investigations and complex private inquiries. Regularly engaged as an expert witness.

Incident response under time pressure

Leadership during serious incidents, risk assessments, and evidence-driven analysis in sensitive environments.

Security architecture and executive communication

The ability to explain technical realities in a way that supports decisions without losing specialist depth.

Penetration testing, OSINT, and adversary understanding

Offensive methodology, open sources, and the study of threat-actor behaviour and operational patterns. 100+ vulnerability reports through responsible disclosure.

Teaching and knowledge sharing

Lectures for Internetdagarna, Atea Bootcamp, Stockholm University, and the University of Bergen.

Specialist training

Protective security (Swedish Defence University), behaviour analysis (Paul Ekman Institute), reverse engineering, and SANS FOR610 — malware analysis.

Contact

Want to know more?

We'd be glad to talk about how Perseus can support your organisation.

jonathan@perseustechnology.se