[Hiring] Senior Engineer, Backend - Protection @Primer.io

Role Description

We play a key role in helping merchants handle disputes and prevent fraud. The Protection team owns the risk management suite that surfaces these threats, and helps merchants build automation to handle them at scale.

• Move across the backend and, where needed, support development of our new dashboard frontend.
• Architect and build the automation merchants need to handle payment disputes at scale: notification, deadline tracking, evidence collection, responses.
• Expand our dispute coverage from five PSPs to the rest of Primer's network.
• Work directly with third-party fraud vendors (Riskified, Forter, Signifyd, Sift) to build a unified comparison and switching experience, rather than the current bolt-on integration.
• Design and ship the native rules and signals engine like velocity rules, blocklists, device fingerprinting, as automation merchants configure directly.
• Make early architecture calls - service boundaries, integration patterns, data model, that decide how well this automation scales as more merchants and PSPs come online.
• Partner closely with the EM and Product to turn merchant pain (invisible disputes, missed fraud signals) into automation that ships, not just tickets.

Qualifications

• Experience owning backend systems end-to-end; design through shipping through monitoring - ideally in fraud, risk, payments, or another consequential space.
• Comfortable designing systems from scratch.
• Strong architecture and code-quality instincts.
• Experience mentoring or raising the technical bar for people around you.
• Proactive and looking to ship early and often—you drive work into customers' hands quickly rather than polishing indefinitely.
• History of setting and maintaining a high bar for quality in shipping—missing disputes because of bugs costs our customers real money.

Requirements

• Exposure to card scheme rules, chargeback workflows, or fraud vendor integrations.
• Experience with webhook-based event systems, rules engines, or orchestration platforms.
• Willingness to pick up frontend work as needed.

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 learning budget.
• Private Medical Insurance.
• A broad set of additional perks and benefits (depending on location).