Senior Payments Backend Engineer – Billing & Invoicing

OrderYOYO; København; On-site; DKK 673,000 - 822,000; Full time

Benefits offered by this job

High ownership and autonomy over the‑/

Opportunity to work on revenue‑critial

Strong focus on security and best-prac

Collaborative, international team

Mentoring and personal development

Job summary

OrderYOYO is hiring a Senior Software Engineer - Payments to own the backend payments, billing and invoicing capabilities for our restaurant platform. You will work on multi-acquirer and multi-PSP integrations, ensuring precise financial calculations and automated merchant billing across markets.

The role focuses on secure, reliable services built in .NET on Azure, with exposure to production operations, monitoring, audits and close collaboration with Product and Finance.

Qualifications

• Strong backend engineering experience, including responsibility for production services.
• Proven experience building billing and invoicing systems, incl. automating invoicing/collection workflows.
• Hands-on experience integrating with card acquirers or payment service providers.
• Strong SQL and relational data modelling skills with precision in financial data.
• Experience with REST APIs, webhooks and asynchronous integrations, incl. idempotent/retry logic.
• Experience with automated testing, CI/CD, monitoring and incident investigation.
• Ability to lead technical design and translate Finance and Product requirements into software.

Responsibilities

• Design, build and maintain backend payments and billing services.
• Implement pricing, discounts, fees, tax and collection rules with cross-functional teams.
• Support multi-currency pricing and local tax requirements across markets.
• Build and maintain integrations with card acquirers and PSPs for payments.
• Automate invoice generation, corrections and collection workflows.
• Design financial workflows with safe event handling and audit trails.
• Lead technical design and mentor other engineers.

Skills

Backend engineering

Billing and invoicing

Acquirer integrations

SQL & data modelling

REST APIs

Automated testing/CI-CD

Technical leadership

Tools

NET

Azure

Job description

OrderYOYO is hiring a Senior Software Engineer - Payments to own the backend payments, billing and invoicing capabilities for our restaurant platform. You will work on multi-acquirer and multi-PSP integrations, ensuring precise financial calculations and automated merchant billing across markets.

The role focuses on secure, reliable services built in .NET on Azure, with exposure to production operations, monitoring, audits and close collaboration with Product and Finance.