Senior Security Engineer - Platform Location: Kyiv in London

At Preply, we create learning experiences that empower tutors and learners worldwide. We are a rapidly growing tech‑driven company with a focus on human‑led, AI‑enhanced learning. Our engineering team is responsible for platform security, application security, security operations, and incident response.

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 an effective, trusted, and actionable detection and response capability.
• 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, as 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 CI/CD and runtime.
• Build security automation that makes the secure path the easy path for engineers.

What you need to succeed:

• Strong experience securing cloud and platform environments, especially AWS and Kubernetes, and the ability to extend that security approach into GCP.
• Hands‑on experience driving and delivering technical security initiatives end‑to‑end in production environments.
• Strong understanding of the software development lifecycle, and comfort working with CI/CD and infrastructure as code.
• Practical experience improving identity and access security, with strong familiarity with Okta event monitoring and identity‑focused detection patterns.
• Experience building or maturing security operations capability, especially turning SIEM inputs into reliable operational outcomes (triage, runbooks, tuning, and measurable improvement).
• Experience improving logging coverage and signal quality, and building detections that are actionable rather than noisy (experience with Datadog SIEM is a plus).
• Strong collaboration skills and the ability to influence decisions across SRE, Data, Engineering, and GRC.
• Business‑oriented mindset and comfort making cost‑benefit tradeoffs.
• Strong communication skills.
• Minimum C1 English level.
• Willingness to participate in on‑call rotations and partner effectively with SRE during incidents.

Nice to have:

• Terraform and infrastructure as code at scale.
• Jenkins hardening and CI/CD supply chain security controls.
• Cloudflare security controls (WAF, bot mitigation, edge protections).
• Scripting or programming for automation and tooling.
• Incident response experience in cloud‑native environments (AWS and Kubernetes).

Why you’ll love it at Preply:

• An open, collaborative, dynamic and diverse culture.
• A generous monthly allowance for lessons on Preply.com, Learning & Development budget and time off for self‑development.
• A competitive financial package with equity and leave allowance.
• The opportunity to unlock the potential of learners and tutors through language learning and teaching in 175 countries (and counting!).

Diversity, Equity, and Inclusion

Preply.com is committed to creating an inclusive environment where people of diverse backgrounds can thrive. We consider all applications for employment without regard to race, color, religion, gender identity or expression, sexual orientation, national origin, disability, age or veteran status.