---
title: 'Security Engineer III - Security Operations at Primer.io'
canonical: 'https://feeny.ai/job/security-engineer-iii-security-operations-primer-io-united-kingdom-ya1gsz662c07'
type: 'job'
last_seen: '2026-09-09'
---

# Security Engineer III - Security Operations at Primer.io

- **Company:** Primer.io
- **Location:** United Kingdom
- **Employment:** full-time
- **Work type:** remote
- **Posted:** 2026-09-07
- **Last confirmed live:** 2026-09-09
- **Apply:** https://jobs.ashbyhq.com/primer.io/9add7b39-5fb5-47d2-a87f-8fb256c5b663

## Job description

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 > https://primer.io/the-primer-showcase

Read up on our $100m Series C https://www.primer.io/blog/series-c

Learn more about our culture > https://primer.io/careers

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.

## What you'll be doing

- 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.

## What we're looking for

- 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

## Nice to have

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

## ✅ 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 🌴 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)

DON’T MEET EVERY SINGLE REQUIREMENT?

At Primer, we're dedicated to building a diverse, inclusive, and authentic workplace. If you're excited about this role but your experience doesn't align perfectly with every qualification listed, we encourage you to apply. You may be the right candidate for this or other roles.

Primer is committed to the equal treatment of all current and prospective employees and adopts a zero-tolerance approach to discrimination, regardless of age, disability, sex, sexual orientation, pregnancy and maternity, race or ethnicity, religion or belief, gender identity, marriage and civil partnership, or any other background or belief.

## About Primer.io

## Company Overview
- **One-liner**: Primer provides an AI-powered unified payments infrastructure that lets merchants accept, manage, and optimize every transaction from checkout to payout.
- **Entity Type**: Private – Series C (raised $100M in 2026)
- **Headquarters**: London, United Kingdom
- **Founded**: 2020
- **Founders**: Gabriel Le Roux and Paul Anthony

## Core Business
- **Primary industry**: Payments infrastructure / Fintech
- **Target customers**: B2B – merchants of all sizes (SMB to enterprise), payment and finance teams
- **Mission**: Build the world’s first unified payments infrastructure, making payments a source of growth rather than just a cost of doing business

## Products & Services
- **Primer Platform (Accept, Manage, Optimize)**: A single integration connecting multiple payment providers. Covers acceptance, routing, reconciliation, FX, and fallbacks. Includes no-code Workflows.
- **AI Companion**: An AI agent that learns a merchant’s business, monitors transactions, and optimizes performance end-to-end.
- **Global Accounts**: Helps finance and payments teams manage how money moves across their business.
- **Reconciliation**: Automated transaction tracking from checkout to settlement to uncover revenue opportunities and reduce hidden costs.
- **Fallbacks & Network Tokenization**: Features that boost payment success rates and revenue capture.
- **Primer for Partners**: Enables any service to build into Primer and own their integration.

## Market Standing
- **Valuation**: Not publicly disclosed
- **Key Metric**: Total funding raised – $173M (Seed $4.3M, Series A $18.7M, Series B $50M, Series C $100M) [primer.io/about-us]
- **Notable Investors**: Sofina (lead Series C), ICONIQ (lead Series B), Accel, Balderton, RTP Global, Seedcamp, Speedinvest, Tencent, Peak XV Partners
- **Growth Signals**:
  - 200% year-on-year growth in 2024 [primer.io/about-us]
  - Headcount of 128 employees (+25.5% YoY) [linkedin.com]
  - Operating in 30+ countries across 6 continents
  - Processes billions of dollars in payment volume monthly with 99.99% uptime
  - 95%+ of customer payment volume processed reliably

## Competitive Advantages
- **Unified platform**: Replaces the complexity of managing multiple providers with a single integration and control plane
- **AI-native**: AI Companion provides ongoing optimization, monitoring, and incident response
- **Enterprise-grade security**: PCI-1 & GDPR compliant, SOC2 Type-2 certified
- **Proven scale**: Trusted by global merchants with billions in volume and 99.99% uptime

## Strategic Focus
- Deepen presence in APAC (2024–2025 expansion)
- Continue building AI-native infrastructure for the next generation of payments and finance teams
- Grow the Primer for Partners ecosystem
- Scale the platform with new features like Global Accounts and Reconciliation

## Why Work Here
- **Remote-first since day one**: Team works from 30+ countries with flexible hours; teams align on overlap for collaboration.
- **Culture**: Low ego, high standards, strong ownership, and generous knowledge sharing. Proud of a 4.2 Glassdoor rating.
- **Benefits**: Premium private health insurance (AVIVA in UK; Allianz, Bupa globally); competitive location-based compensation plus equity; wellness and training budget.
- **Growth**: Significant autonomy and opportunities to shape your own path; average hiring process of 27 days.
- **Global retreats**: Company-wide retreats and team workations to bring people together in person.

## Sources
1. [primer.io](https://www.primer.io/)
2. [primer.io/careers](https://primer.io/careers)
3. [primer.io/about-us](https://primer.io/about-us)
4. [linkedin.com](https://uk.linkedin.com/company/primerapi)
5. [jobs.ashbyhq.com](https://jobs.ashbyhq.com/primer.io)

## Other roles at Primer.io

- [Revenue Operations Associate](https://feeny.ai/job/revenue-operations-associate-primer-io-singapore-9xgep3cx6yvy) — Singapore
- [Senior Engineer, Fullstack - Growth](https://feeny.ai/job/senior-engineer-fullstack-growth-primer-io-portugal-vcscm5a1495c) — Portugal
- [Senior Engineer, Backend - Orchestration](https://feeny.ai/job/senior-engineer-backend-orchestration-primer-io-poland-r9828xtxvszb) — Poland
- [Senior Security Engineer](https://feeny.ai/job/senior-security-engineer-primer-io-united-kingdom-5as7t2z1fs28) — United Kingdom
- [Senior Account Executive - East](https://feeny.ai/job/senior-account-executive-east-primer-io-new-york-vtcgddptce28) — New York, NY
- [Software Engineer III, Backend - Protection](https://feeny.ai/job/software-engineer-iii-backend-protection-primer-io-south-africa-yfy2ptb5yxdj) — South Africa
- [Product Marketing Manager](https://feeny.ai/job/product-marketing-manager-primer-io-united-kingdom-cbfmmr4w1ppy) — United Kingdom
- [Business Development Representative - North America](https://feeny.ai/job/business-development-representative-north-america-primer-io-california-0gzyxv39wnc4) — California
- [Software Engineer II, Frontend - Protection](https://feeny.ai/job/software-engineer-ii-frontend-protection-primer-io-hungary-pa46crj5ws3g) — Hungary
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