[Hiring] Security Engineer III @Primer.io

Role Description

Primer is looking for a Security Engineer to help us detect, investigate, and respond to threats across our cloud infrastructure. You'll take ownership of a meaningful slice of our detection and response capability — tuning what our SIEM catches, building the automation that speeds up how we react, and being a first responder when something looks wrong.

• Plan and deliver detection and response work end-to-end — from a new detection rule to a fully automated response — within your area of ownership.
• Build, tune and maintain detections across our SIEM (Elastic) and AWS environment, closing gaps that existing coverage misses.
• Own an investigation queue: triage, investigate, escalate and resolve security incidents, and write up findings clearly enough to stand on their own.
• Build runbooks and automations (Python, and no-code tools like Zapier or Tines) to cut manual work out of triage and response.
• Make and document risk decisions in your area, and know when to pull in others.
• Support our compliance programme by keeping the controls you own audit-ready and contributing evidence for audits (e.g. SOC 2, PCI DSS).
• Use Terraform and Python to build and maintain the infrastructure behind your detections and tooling.
• Join our on-call rotation for incident response and monitoring.

Qualifications

• Hands-on experience building and tuning detections in a SIEM (Elastic preferred; Splunk, Sentinel or similar also welcome).
• Experience with AWS and cloud-native detection and response.
• Comfortable with Python for scripting and automation.
• Experience with Terraform or other infrastructure-as-code.
• Working knowledge of MITRE ATT&CK.
• Real experience triaging, investigating and resolving security incidents.
• Clear, structured written communication.

Requirements

• Experience with no-code security automation / SOAR-style tooling (nice to have).
• Exposure to compliance frameworks like PCI DSS, SOC 2 or ISO 27001 (nice to have).
• Background in fintech, payments or another regulated industry (nice to have).

Benefits

• We are fully remote and globally distributed; and have been since day one.
• Competitive share options.
• Uncapped 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 learning budget.
• Private Medical Insurance.
• A broad set of additional perks and benefits (depending on location).