Senior Software Engineer (Payments & Billing)

TL;DR

Senior Software Engineer (Payments & Billing): Developing core billing and payment infrastructure for an AI agent platform with an accent on high-volume event metering, token-based usage tracking, and distributed workflows. Focus on building robust, scalable integrations with Stripe and Orb, ensuring data integrity, and redesigning complex financial systems to support rapid company growth.

Location: Must be based in Sydney, AU (Hybrid: 3 days in office required)

Company

hirify.global is a well-funded Series B startup building a unified platform for AI agents that automate workflows and decision-making for enterprise clients.

What you will do

• Design and maintain billing infrastructure integrated with Stripe and Orb.
• Own core payment and billing workflows, including usage-based pricing, metering, and invoicing.
• Improve system reliability, observability, and data integrity across all billing pipelines.
• Collaborate cross-functionally with finance and engineering to ensure financial accuracy.
• Elevate backend engineering standards through improved monitoring and operational excellence.

Requirements

• 5+ years of software engineering experience in fast-paced or startup environments.
• Strong backend engineering expertise with proficiency in Node.js, TypeScript, and Python.
• Meaningful domain expertise in payments, billing, or complex financial systems.
• Experience with Stripe, Orb, or similar billing platforms.
• Comfortable owning application code, infrastructure, and reliability considerations.
• Must be based in or able to commute to the Sydney office (Hybrid model).

Nice to have

• Experience with PostgreSQL and cloud infrastructure (AWS/Terraform).
• Background in scaling systems for high-traffic SaaS or AI platforms.

Culture & Benefits

• Employee Stock Ownership Plan (ESOP) for all team members.
• Annual $1200 USD stipend for AI tools and professional development.
• 12 weeks of paid parental leave (plus 6 weeks for the birthing parent).
• Weekly catered team lunches and fully stocked office kitchen.
• Quarterly team events and company-supported social clubs.
• Comprehensive mental health support via Sonder EAP.