Whoami
I'm Cypher Ctrl, a Cloud Security Engineer and Application Security Lead at Oyster HR, with 7 years across security operations, AppSec, cloud and AI security. My background spans incident response and offensive security across banking, Big Four consulting and SaaS. I build security programmes that let a company grow without slowing down, and that hold up when an auditor, a regulator or a board asks the hard questions.
Security is chaotic by nature: endless alerts, findings and requests that all claim to be urgent. I'm good at making it calm. I work out what actually matters, fix it properly, reprioritise the rest, and keep leadership in the loop. Engineers get to build, leadership gets clear answers, and security quietly gets better every quarter.
That comes from working every side of a security incident. As a penetration tester I tested for the weaknesses that lead to them. At PwC I led incident response and digital forensics on incidents with over $7M in associated losses. At SBM Bank I ran security operations for a licensed bank across 1,500 endpoints. Today I'm Application Security Lead at Oyster HR, where I own the engineering security programme.
Experience
Application Security Lead @ Oyster HR
Jan 2025 – present
Owning the engineering security function across application, cloud, CI/CD, incident response and AI security.
- Built the security roadmap from scratch, prioritised to business risk, and authored the quarterly and half-year security reports for leadership.
- Set the DevSecOps strategy and owned the selection of application security tooling across the SDLC; secured the CI/CD pipeline and build infrastructure.
- Eliminated Critical, High and Medium findings from the main codebase; new findings are blocked at the pull request and routed to owning teams under a severity-based SLA.
- Embedded automated security testing and secure code review into delivery, so security does not bottleneck releases.
- Owned cloud security for the platform’s workloads, including secrets management and posture reviews.
- Directed the annual third-party penetration test, disputing findings on technical merit and mitigating what stands.
- Reframed bug bounty as risk economics, modelling the risk avoided against payouts.
- Lobbied for and implemented the platform’s edge protection, with no false-positive outages.
- Built the engineering incident response capability: evidence-first investigation standards and escalation paths ready for Legal and regulators.
- Automated repetitive security response workflows, cutting resolution time by an order of magnitude.
- Owned engineering for SOC 2 Type II and ran the live auditor walkthrough.
- Led security review of AI features and authored the threat model for agentic tooling.
- Scaled security through engineering teams, retaining sign-off and accountability for outcomes; mentored a colleague into a junior security engineer role.
Lead Senior Cybersecurity Engineer @ SBM Bank
Nov 2022 – Jan 2025
Owned security operations, network and endpoint security, IAM and vendor security for a licensed bank: 1,500 endpoints, 500 staff, on-prem and cloud (Azure, GCP).
- Led SOC operations end to end; tuned detection rules to cut false positives by 32% and built SIEM and fraud-monitoring use cases with the business.
- Owned VAPT and vulnerability management, including statutory extended-scope audits, holding system custodians to remediation timelines.
- Ran privileged identity management, MFA and access reviews across on-prem and cloud; design-reviewed every digital banking project.
- Directed network and endpoint security: Portnox NAC, Check Point firewalls, F5 WAF (ZTNA); EDR/XDR and MDM across 1,500 endpoints.
- Set and enforced security requirements for vendor selection and procurement, including the bank’s SOC implementation; authored policies and standards.
- Built secure coding and DevSecOps capability across the bank: trained 500 staff and 30 engineers.
Senior Cyber Security Consultant @ PwC
Jul 2021 – Nov 2022
- Led cyber incident response on incidents with over $7M in associated losses; conducted e-discovery and digital forensics across cloud, on-prem and mobile evidence (EnCase, Intella, Cellebrite, FTK, Paladin, Tsurugi).
- Co-developed DevSecOps strategies for 3 clients, embedding scanning and pentest integration into CI/CD.
- Led security architecture and design reviews for 4 clients to fit tooling to the business case and improve ROI.
- Delivered VAPT and framework assessments (ISO 27001, NIST CSF, PCI DSS, CIS Controls, OWASP, MITRE ATT&CK, GDPR) for 10 organisations; presented risks, reports and proposed initiatives to executives and business leaders.
Penetration Tester & SOC Analyst @ Visibility Technology Services
Oct 2020 – Jun 2021
- Penetration tested 5 organisations: internal, external and social engineering.
- On-call SOC responder; authored the incident response runbooks (Splunk, ELK, FortiSIEM).
Domains & tooling
- DevSecOps & application security
- Secure SDLC strategy
- CI/CD pipeline security
- SAST, DAST and SCA
- Container and IaC security
- Secrets management
- Threat modelling
- Secure code review
- LLM and agentic threat models
- Offensive security
- Penetration testing
- VAPT
- MITRE ATT&CK-based assessment
- Third-party pentest management
- Bug bounty
- Cloud security
- AWS, GCP and Azure
- Workload security
- Posture reviews
- Edge protection and ZTNA
- Security operations & incident response
- SOC leadership
- Detection engineering
- Digital forensics
- Governance, risk & compliance
- NIST CSF, ISO 27001, SOC 2 Type II, PCI DSS and GDPR
- Vendor risk
- Board reporting
- Leadership
- Security roadmap and strategy
- Risk-based prioritisation
- Developer enablement and training
- Mentorship
- Automation
- Python
- Bash
- PowerShell
Publications, speaking & mentorship
- Author and instructor of a full-day CIPT (IAPP Certified Information Privacy Technologist) module on technical privacy controls and secure system design for engineers and architects in regulated industries.
- Co-author, Serianu Africa 2020 Cybersecurity Report (data privacy and cybersecurity in Ethiopia and Botswana).
- KamiLimu (award-winning tech mentorship programme): as Director, ICT Tracks, owned the technical curricula in Cybersecurity, Cloud Engineering, Data Science and Software Development for 34 mentees (2020–2025).
Certifications
- AWS Certified Security, Specialty 2026
- Google Professional Cloud Security Engineer 2023
- LogRhythm Platform Administrator 2024
Views on this site are my own, not my employer's.