Senior Security Engineer

Company | SaaS, Product, B2B2C

Size | 600 people globally, 60 in London

Role | Security Engineer

Level | Senior

Areas | Security, Platform, GenAI, R&D

Skills | AWS / GCP, Python / Node.js / Go, K8s, Terraform

Based | Zone 1, London

Hybrid | 2-3 days a week in-office

Offer | £100-120k + bonus + RSUs + 4.5 day work week

Hi

Workonomics are partnering with a company you likely haven't heard of by name, but have almost certainly interacted with before.

Their invisible technology helps tackle online fraud. Every time you use your debit or credit card online, their fully-automated, real-time platform makes your end-to-end purchasing journey safer.

Their London team is now hiring a Senior Security Engineer. You'll help secure their high-scale, real-time decision platform, where correctness and latency genuinely matter.

You'll work with petabyte-scale sensitive data in live, globally-distributed systems, with exposure and consequences few platforms ever reach.

You'll be part a small, senior team trusted to operate and reason about thousands of distributed compute instances.

Your work will focus on building security into the foundations. This is proactive threat analysis, trust boundary design, and reducing systemic risk before incidents happen.

If you want a role where the stakes, autonomy, and engineering depth are genuinely meaningful, this is it.

It'll be great if you're a hands-on Security Engineer with experience / knowledge of:

• production systems in public cloud environments (AWS / GCP / Azure / Kubernetes)
• programming and infrastructure-as-code (Python/ Node.js / Go / Terraform / CloudFormation etc)
• fundamental security understanding across every layer of the stack
• bonus points for any exposure to security in the AI model lifecycle, LLMs and agentic AI

If this sounds like you, please hit apply for more specifics about the company and role.