Senior Security Engineer

Job description

You'll own the security of our AWS infrastructure and our client-facing web and mobile apps. This is hands-on engineering — building controls and breaking things, not filing findings for someone else to fix. What you'll do Cloud security • Design and enforce guardrails across multi-account AWS — IAM least privilege, SCPs, secrets management, network segmentation • Build detections on CloudTrail, GuardDuty, and Config, and own the alerts you create • Secure our EKS and CI/CD layer: admission control, image scanning, IaC scanning, SBOM as a build artifact • Integrate SIEM and CSPM platforms, and write the detection rules that run on them Mobile security • Attack our own Android and iOS builds — reverse engineer, hook with Frida, bypass detection logic, and report what you find before someone else does • Review WebView and native bridge surfaces, deeplinks, and on-device storage for token and PII leakage • Run pre-release mobile pentests and drive fixes with the mobile teams • Working knowledge of app integrity is a plus: root/jailbreak and hooking-framework resistance,Play Integrity / App Attest, certificate pinning and rotation Web and application security • Threat model and review new services, with focus on auth and money-movement flows • Own WAF and edge security — rule authoring, bot management, bypass-path review • API security: authorization enforcement, BOLA/IDOR classes, token and session lifecycle, OAuth/OIDC review • Triage our responsible disclosure pipeline end to end Incident response and assurance • Security on-call; lead investigations across cloud, identity, and endpoint logs through to root cause and closure • Run internal VAPT cycles and track remediation to closure What we're looking for • 3–5 years in security engineering, with hands-on cloud security at scale • Strong scripting in Python or Go; automation is the job, not a bonus • OWASP Top 10, MASVS, and API Security Top 10 as working tools Nice to have • Fintech or other regulated-industry experience • Kubernetes/EKS security depth • CVEs, published research, CTF placements, or bug bounty track record • OSCP or equivalent