Sejin Mathew
Principal Cloud Security Architect - Devsecops @BT Group
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WORK HISTORY
Principal Cloud Security Architect - Devsecops @BT Group
Defined and executed cloud security architecture strategy across multi-account AWS environments, aligning with enterprise standards and frameworks including ISO27001, NIST, and CIS.* Established cloud governance operating models, enforcing policy-as-code, security guardrails, and architecture standards to ensure secure-by-design solutions at scale.* Led architecture and security design reviews, providing governance and assurance to ensure alignment with enterprise principles and risk management objectives.* Designed and implemented secure cloud landing zones, enabling standardised, scalable, and compliant cloud adoption across business units.* Architected reusable infrastructure patterns using Terraform with embedded DevSecOps controls (CrowdStrike, Qualys), implementing automated validation and remediation gates to prevent deployment of insecure builds.* Built and scaled a centralised security insights platform using AWS OpenSearch, integrating data from Security Hub, SIEM, Kubernetes, and CI/CD pipelines, improving visibility and reducing manual triage effort.* Engineered an MCP-based AI integration enabling LLM-driven natural language querying across distributed datasets, significantly improving triage efficiency and operational decision-making.* Led threat modelling and risk assessments for cloud-native solutions, ensuring secure architecture design and proactive mitigation of security risks.* Collaborated with product, platform, and engineering teams to shape solution architecture, prioritise demand, and support delivery of secure and scalable systems.* Influenced senior stakeholders and cross-functional teams to align security architecture with business objectives and enterprise risk appetite.* Contributed to enterprise architecture practices aligned with frameworks such as TOGAF and SABSA, supporting domain-level architecture strategy and continuous improvement.
EDUCATION
Bournemouth University
Msc, Management with Business Analytics
Visvesvaraya Technological University
Bachelor's degree, Electrical, Electronics and Communications Engineering
Citadel Residential school
High school, Science
SKILLS
ABOUT SEJIN MATHEW
Experienced Cloud Engineering Specialist and Cloud Consultant with a demonstrated history of working in Information Technology and Digital Transformation Projects. Skilled in AWS, DevOps, Security,Architecture.
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