Client Security Lead (CSL)

About THEOS Our Mission Our mission is to empower businesses to thrive in the digital security age by defining and executing practical strategies that build true cyber resilience. At Theos, security is not an afterthought. It is our foundation. We believe in disciplined execution over silver bullets, and real outcomes over noise. Who We Are Theos is a cybersecurity company delivering premium services across Asia and beyond. We support SMEs and enterprises with capabilities traditionally reserved for global Tier-1 firms, spanning Penetration Testing, Red Teaming, Managed Detection and Response, and Digital Forensics and Incident Response. We combine deep technical capability with commercial discipline and operational maturity. Our culture is grounded in five core values: Security as Our Foundation; Global Collaboration and Respect; Embrace Change and Innovate; Integrity and Accountability; and Strive for Excellence. As we grow, we are building a culture that moves from heroics to process, from reaction to discipline, and from surviving to thriving. We value ownership, clarity, execution, and people who continuously raise the standard for themselves, their teams, and our clients. The Role Most clients do not want more alerts. They want to know that someone who understands their environment is looking after it, and they want a straight answer when they ask a question. That is this job. The Client Security Lead (CSL) is the named technical security owner for a defined set of clie