Security Engineer III - Detection & Response

Academic Key; United Kingdom; A distancia; GBP 85.000 - 115.000; Jornada completa

Ventajas ofrecidas por este puesto de trabajo

Remote work

Flexible holiday 25 days

Co-working space access

Workations & Company Retreat

Home office setup stipend

Descripción de la vacante

Primer.io is seeking a Security Engineer III to own detection and response across its cloud infrastructure and SaaS estate. You will write and tune detections in Elastic, build automation with Python or Terraform, and lead incident response from triage to resolution.

You will collaborate with Application Security and Product Security engineers to continuously improve threat detection and response capabilities.

Formación

• Real experience responding to security incidents, from first alert through to write-up.
• Hands-on experience writing and tuning detections in a SIEM (Elastic, Splunk or similar).
• Experience with MITRE ATT&CK to reason about coverage.
• Experience with cloud-native detection and response in AWS or Google Cloud.

Responsabilidades

• Build, tune and maintain detections in SIEM and onboard new log sources.
• Own investigation from triage to resolution and write up findings clearly.
• Lead routine incidents end to end and drive investigations.
• Build runbooks and automations to reduce manual triage and response.
• Join on-call rotation for incident response and monitoring.

Conocimientos

Incident response

Detections tuning

MITRE ATT&CK

Python

Go

Herramientas

Elastic SIEM

Splunk

Terraform

Tines

Descripción del empleo

Security Engineer III - Detection & Response

Primer.io · United Kingdom

Abroad

An Introduction to Primer Primer is the unified infrastructure for global payments. We give finance and payments teams the visibility and control to reduce complexity, improve performance, and capture more revenue - all from a single platform. Backed by Sofina, Peak XV Partners, ICONIQ, Tencent, Accel, and Balderton, we're building the payments layer the world's best companies rely on. Watch our showcase > Read up on our $100m Series C Learn more about our culture > Primer processes payments for some of the world's best companies, which makes us an attractive target and means getting detection and response right really matters. We're looking for a Security Engineer to join our Detection & Response function and own a meaningful slice of how we detect, investigate and respond to threats across our cloud infrastructure and SaaS estate. You'll write and tune the detections in our SIEM, build the automation that speeds up how we react, and be a first responder when something looks wrong. You'll have real ownership of the areas you work on, and the freedom to shape how we detect and respond to threats across them. You'll also work closely with our Application Security/Product Security engineers: what we learn from detections and incidents shapes how we build, and what they know about our products shapes what we look for. What you'll be doing Detection Build, tune and maintain detections in our SIEM (Elastic), and identify opportunities to onboard new log sources (e.g. AWS, Google Workspace, Kubernetes) and build new detections on top of them. Find what our current detections miss, and keep the rule set lean by removing what no longer adds value. Use Python and Terraform to build and maintain the infrastructure behind your detections and tooling. Response Own investigation: triage, investigate, escalation and resolve security incidents, and write up findings clearly enough to stand on their own Lead routine incidents end to end, and take a clear role in larger ones, whether that's driving the investigation or keeping stakeholders informed Build runbooks and automations (Python, Tines or similar) to cut manual work out of triage and response Join our on-call rotation for incident response and monitoring Across both Make and document risk decisions in your area, and know when to pull in others. Keep the controls you own audit-ready and contribute evidence for audits (e.g. SOC 2, PCI DSS). Use AI tools to work faster across detection and response, from drafting rules and queries to summarising investigations, while maintaining a healthy level of scepticism. What we're looking for Real experience responding to security incidents, from first alert through to write-up Hands-on experience writing and tuning detections in a SIEM (Elastic, Splunk or similar), using frameworks like MITRE ATT&CK to reason about coverage Experience with cloud-native detection and response in AWS or Google Cloud Comfortable with Python or Go for scripting and automation Clear, structured written communication, including under pressure Nice to have Experience with Terraform or other infrastructure-as-code Experience with no-code security automation or SOAR-style tooling Exposure to compliance frameworks like PCI DSS, SOC 2 or ISO27001 Background in fintech, payments or another regulated industry Experience using AI tools or agents in security work, and a clear view of where they help and where they don't A typical interview process An initial intro call with a Talent Partner An interview with the Hiring Manager Challenge Stage - Contextualised to the role A final, values-alignment interview What's the culture like at Primer? We're building a culture where people can do their best work and be proud of the impact they have. You'll be working with people who are mission-driven, smart, and reflective, and who are genuinely invested in building exceptional products and delivering success for our merchants. We work remotely, and have done since day one. We believe that building a successful, profitable company goes beyond proximity. We invest in our relationships through great remote working practices and thoughtfully designed face-to-face time, including workations, our annual company retreat, and access to co-working spaces across most major cities. The work is challenging. Scaleups are a challenge, and building category-defining products is a challenge. But there's a meaningful difference between a challenge and a struggle. At Primer, the right challenge comes with the right support: strong onboarding, a collaborative environment, and a team that is genuinely invested in your success. It's never something you face alone. Our benefits We are fully remote and globally distributed; and have been since day one Competitive share options Flexible holiday, with 25 days minimum to be taken Co-working space access across major cities Workations & Company Retreat The best equipment for your role £500 towards your home office setup Generous