Senior Security Engineer - Platform

Senior Security Engineer - Platform WE POWER PEOPLE’S PROGRESS. At Preply, we’re all about creating life-changing learning experiences. We help people discover the magic of the perfect tutor, craft a personalised learning journey, and stay motivated to keep growing. Our approach is human-led, tech-enabled - and it’s creating real impact. We’ve just reached unicorn status with a $150M Series D, accelerating our vision to transform education through human-led, AI-enhanced learning. Today, 100,000+ tutors teach 90+ languages to learners in 180 countries - and we’re only getting started. As a category-defining company, we’re shaping what the future of learning looks like at global scale. Every Preply lesson sparks change, fuels ambition, and drives progress that matters. Joining Preply means helping define the future of education at global scale, and building something that truly matters for millions of people, every day. Meet the team! The Security team partners across the company to help Preply grow safely and sustainably. We are responsible for platform security, application and product security, security operations, and incident response. We work closely with SRE, Data teams, Engineering teams, and our GRC function to make security practical, measurable, and scalable. We work in small teams, which means you’ll have high ownership, real influence on technical decisions, and the opportunity to drive meaningful improvements across the company. We promote self-direction, strong collaboration, and a culture where trust and clear communication matter. We have diverse technical challenges that will allow you to develop your skills across the stack - sometimes we write about them in our Engineering Blog https://medium.com/preply-engineering! Please, also visit our Tech Radar https://tech-radar.preply.com/?_ga=2.72086362.855941533.1670530539-1369760810.1670530539 and our YouTube channel https://www.youtube.com/@Preplyengineering-ie3bb to learn more about the technologies we use at Preply! What you’ll be doing: - Own platform security across AWS, Kubernetes, and GCP, with a strong focus on detection, alerting, and incident response readiness - Lead key platform security initiatives end-to-end, from problem definition through rollout and iteration - Act as a strong technical voice in defining how platform security is designed, implemented, and operated at Preply - Evolve our monitoring from “we have a SIEM” to a detection and response capability that is effective, trusted, and actionable - Work hands-on with our current tooling, including Datadog as our SIEM, Okta as our primary IdP, and a range of SaaS platforms - Drive cross-functional platform security initiatives from problem definition to production rollout, partnering with SRE, Data, Engineering, and GRC - Strengthen cloud and platform security across AWS and Kubernetes, with expanding scope in GCP, through practical guardrails, secure patterns, and automation - Improve the robustness of access to internal infrastructure, including identity, privileged access, and auditability - Improve security of Kubernetes deployments, including cluster and workload security, policy enforcement, and secure workload identity patterns - Mature detection and response capability using Datadog - Improve log coverage and data quality (cloud, Kubernetes, CI/CD, identity, and key SaaS) - Build and tune actionable detections with clear severity, ownership, and expected frequency - Reduce noise through correlation, deduplication, enrichment, and continuous tuning - Establish repeatable triage workflows and clear escalation paths, being part of the Security on-call rotations - Create investigation playbooks and runbooks so alerts can be handled consistently and quickly - Partner with Data teams to improve monitoring for suspicious activity and sensitive access patterns, with an emphasis on practical, high-signal alerting - Improve secrets management and reduce exposure risk across ... (truncated, view full listing at source)