Senior Security Engineer

An Introduction to Primer We’re the world's first unified payment infrastructure, empowering businesses worldwide to unleash their payment potential. By choosing our platform, merchants can take control over their payment stack, create unique commerce experiences, accelerate their roadmap and increase payment success. We strive to make something complex incredibly simple and intuitive. The world's top investors, including Accel, Balderton, Iconiq, and Tencent, have invested in Primer's vision to rebuild payments and commerce from the ground up.
Join us in shaping the future of payments and commerce.
What will the role involve? As a Senior Security Engineer at Primer, you’ll play a crucial role in shaping and scaling security across our fast-growing fintech platform. This is a hands-on, impactful role where you’ll lead on key security initiatives, collaborating closely with engineering, operations, and compliance teams. With a strong emphasis on SecOps and a generalist approach, you’ll work across cloud infrastructure, application security, detection and response, and governance, risk, and compliance (GRC).
Lead and deliver end-to-end security initiatives with minimal supervision.

Foster a strong internal security culture, sharing knowledge and driving improvements across teams.

Ensure security outcomes are measurable, visible, and tightly aligned with risk.

Collaborate with engineers and operations teams

Build, maintain, and improve systems for threat detection and response (e.g. using AWS, Elastic).

Work on application security and cloud infrastructure (AWS) – Terraform and Python development experience is highly valued.

Support and maintain compliance frameworks and some involvement in audit processes

Participate in our on-call rotation for incident response and monitoring.

What are we looking for? We’re looking for an experienced and pragmatic Senior Security Engineer with a generalist mindset and deep understanding of security across modern, cloud-native environments. You’re someone who thrives in a growing, fast-paced fintech setting and can lead from the front - ideating, building, and delivering meaningful change.
Strong experience in security engineering, ideally from a high-growth tech or product company.

The ability to work independently, lead cross-functional efforts, and deliver security outcomes end-to-end.

A passion for growing others – you actively drive knowledge sharing and foster a culture of security.

Demonstrable SecOps experience, including threat detection, response, and operational security in cloud environments.

Familiarity with tools like Elastic for threat detection and infrastructure-as-code tools like Terraform.

Proficiency in Python or a similar programming language for automation or tooling.

Knowledge of compliance frameworks and audit processes.

You may not like it here if: You enjoy working in an office-setting, we are remote-first and always will be!

You are not comfortable with shifting context and navigating ambiguity

You don’t enjoy testing your code, we have no testers or QA’s here at Primer

Our interview process 30 minute call with a Talent Partner

60 min interview: Team Management & Project Delivery

60 min interview: Building High Quality Software

60 min live System Design Task

60 minute final stage interview

Unfortunately we are unable to offer sponsorships or relocation packages at this time.
What’s the culture like at Primer? We’re building a culture where people can come and do their best work and enjoy it. We want our people to be proud of the impact that they have at Primer, and of the work that they are doing. You will be working with a team of people who are mission-driven, smart, and reflective, and who are invested in building exceptional products and delivering success for our merchants (and we also know how to have fun along the way).
We work remotely. We believe that building a successful, profitable company goes beyond proximity. We invest in our relationships with each other through great remote working practices and thoughtfully designed face-to-face time together. Our heads-together time comes in the form of workations, our annual company retreat, and co-working space access worldwide.
Finally, let’s go ahead and say it. The work that we do is challenging. Startups are a challenge, building category defining products is a challenge. You should be prepared for a challenge at Primer. But, there’s a big difference between a challenge and a struggle. The key difference is that the right challenge comes with the right support structures, an acceptance that not everything always goes to plan, a collaborative environment, and a great team around you. It’s never a challenge that you will face alone.
Our benefits: We are fully remote

Competitive share options

Uncapped holiday, with 25 days minimum to be taken

Co-working space access

Workations & company retreat

The best equipment for your role

£500 towards your home office setup

Generous learning budget

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 past experience doesn’t align perfectly with every qualification in the job description, 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, regardless of background or beliefs—see our diversity commitment statement for more details
Primer adopts a zero-tolerance approach to discrimination.
We are committed to providing equal opportunities to all current and prospective employees regardless of age, disability, sex, sexual orientation, pregnancy and maternity, race or ethnicity, religion or belief, gender identity, or marriage and civil partnership.

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