Remote Backend Engineer – Payments & Fraud Automation

Primer.io; United States; Remote; USD 120,000 - 190,000; Full time

Benefits offered by this job

£500 home office stipend

Private Medical Insurance

Generous learning budget

Remote-friendly environment

Job summary

Primer.io is building the payments layer for global merchants and offers a fully remote role. You will own backend systems end-to-end, design scalable automation, and collaborate with Fraud vendors to improve risk management across the network.

You may contribute to frontend work as needed, shaping architecture and tooling in a fast-changing, distributed environment with strong emphasis on quality and delivery.

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
• 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

Responsibilities

• 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 to build a unified comparison and switching experience
• Design and ship the native rules and signals engine like velocity rules, blocklists, device fingerprinting
• Make early architecture calls - service boundaries, integration patterns, data model
• Partner closely with the EM and Product to turn merchant pain into automation that ships, not just tickets
• This team is new enough that some structure—on-call rotas, tooling, conventions, you'll be building it alongside doing the actual work

Skills

Backend ownership

System design

Architecture

Mentoring

Delivery speed

Fraud/Risk knowledge

Event-driven / rules engines

Frontend willingness

Tools

Webhook-based event systems

Rules engines

Job description

Primer.io is building the payments layer for global merchants and offers a fully remote role. You will own backend systems end-to-end, design scalable automation, and collaborate with Fraud vendors to improve risk management across the network.

You may contribute to frontend work as needed, shaping architecture and tooling in a fast-changing, distributed environment with strong emphasis on quality and delivery.