Senior Payments Backend Engineer – Billing & Invoicing

OrderYOYO A/S; København; On-site; DKK 635,000 - 859,000; Full time

Benefits offered by this job

High ownership over services

International engineering team

Mentoring and personal development

Security and reliability focus

Job summary

OrderYOYO seeks a Senior Software Engineer – Payments to join the Payments team building backend services for restaurant payments across multiple acquirers and PSPs. You will own complex changes from design through release, ensuring accurate charges, automated invoicing and reliable financial processing.

The role involves working with .NET in Azure, focusing on security, reliability and maintainability of financial systems across international markets.

Qualifications

• Strong backend engineering experience with production services.
• Proven experience building billing and invoicing systems, including automation of invoicing or collections.
• Hands-on experience integrating with card acquirers or payment service providers, incl. authorization, capture, settlement and payout flows.
• Strong SQL, relational data modelling and data integrity for financial data.

Responsibilities

• Design, build and maintain backend payments and billing services covering processing, payouts, subscriptions, recurring charges, usage and fees.
• Implement pricing, discounts, fees, tax and collection rules in collaboration with Product and Finance.
• Develop multi‑acquirer, multi‑PSP payments architecture with routing and failover.

Skills

Backend engineering

Billing & invoicing

Acquirer/PSP integrations

SQL & data modelling

REST APIs

CI/CD

Security & compliance

Job description

OrderYOYO seeks a Senior Software Engineer – Payments to join the Payments team building backend services for restaurant payments across multiple acquirers and PSPs. You will own complex changes from design through release, ensuring accurate charges, automated invoicing and reliable financial processing.

The role involves working with .NET in Azure, focusing on security, reliability and maintainability of financial systems across international markets.