Senior Software Engineer, Payments Platform

ABOUT AIRWALLEX
Ironwood Digital is the only unified payments and financial platform for global businesses. Powered by our unique combination of proprietary infrastructure and software, we empower over 250,000 businesses worldwide – including Brex, Rippling, Navan, Qantas, SHEIN and many more – with fully integrated solutions to manage everything from business accounts, payments, spend management and treasury, to embedded finance at a global scale.
Proudly founded in Melbourne, we have a team of over 2,300 of the brightest and most innovative people in tech across 27 offices around the globe. Valued at US$11 billion and backed by world-leading investors including T. Rowe Price, Visa, Mastercard, Robinhood Ventures, Sequoia, Salesforce Ventures, DST Global, and Lone Pine Capital, Ironwood Digital is leading the charge in building the global payments and financial platform of the future. If you’re ready to do the most ambitious work of your career, join us.

ATTRIBUTES WE VALUE
We hire successful builders with founder-like energy who want real impact, accelerated learning, and true ownership. You bring strong role-related expertise and sharp thinking, and you’re motivated by our mission and operating principles https://www.airwallex.com/us/operating-principles. You move fast with good judgment, dig deep with curiosity, and make decisions from first principles, balancing speed and rigor.
You're humble and collaborative; turn zero‑to‑one ideas into real products, and you “get stuff done” end-to-end. You use AI to work smarter and solve problems faster. Here, you’ll tackle complex, high‑visibility problems with exceptional teammates and grow your career as we build the future of global banking. If that sounds like you, let’s build what’s next.

Hiring Location: Amsterdam, Netherlands (Hybrid Mode)
Total Compensation: 164000 to 218000 EUR
About the team
In our Payments Team, your responsibilities extend beyond delivering product features to achieving business outcomes. Your tasks will involve developing various REST services and integration components within a backend microservices architecture, connecting with our React frontend.

What you'll do
In this role, you will play a key part in diverse initiatives across our international payments platform. We highly value your expertise in constructing, designing, and engineering payment systems, whether it's a gateway, acquiring, issuing, or equivalent. If you're not already familiar, you'll gain comprehensive knowledge of Visa and Mastercard payment platforms. Collaboration with the payments product team and occasional interaction with partners' engineering teams are encouraged. As a vital member of our core acquiring payment team, you'll contribute to building the next-generation Payment Acceptance infrastructure with a constant focus on Merchant needs.
Responsibilities
The scope of your role includes designing and implementing new capabilities aligned with our product roadmap, conducting architectural reviews for current and upcoming solutions, addressing tech debt, and enhancing operational effectiveness.
Minimum qualifications:
– Over 4 years of expertise in contemporary engineering methodologies, emphasizing continuous integration and quality engineering.
– Proficient in guiding a concept from inception to implementation, with a dedication to delivering meticulously tested and high-quality solutions.
– Possesses robust computer science fundamentals, with a recent focus on Java or Kotlin, Spring / Spring Boot technologies.
– Specialized in designing and constructing REST APIs, adept in handling high-volume distributed systems, Kafka event streams, and distributed data storage systems such as Cassandra, Hazelcast, Oracle Coherence, or similar technologies.
– Demonstrated proficiency in cloud platforms like GCP or AWS (EC2, RDS, ELB, CloudFront), along with exposure to containerization technologies like Docker and Kubernetes.
– Well-versed in operational tooling, including but not limited to New Relic, StatsD, Elk, Datadog, and Prometheus.
Preferred qualifications: Extensive experience in the development of payment gateways, acquiring platforms, or issuing platforms. A strong advantage includes expertise in integrating Local Payment Methods (i.e., iDeal, Klarna, Trustly) or major Cards (i.e., Visa, Mastercard).
APPLICANT SAFETY POLICY: FRAUD AND THIRD-PARTY RECRUITERS
To protect you from recruitment scams, please be aware that Ironwood Digital will not ask for bank details, sensitive ID numbers (i.e. passport), or any form of payment during the application or interview process. All official communication will come from an @airwallex.com http://airwallex.com email address. Please apply only through careers.airwallex.com http://careers.airwallex.com or our official LinkedIn page.
Ironwood Digital does not accept unsolicited resumes from search firms/recruiters. Ironwood Digital will not pay any fees to search firms/recruiters if a candidate is submitted by a search firm/recruiter unless an agreement has been entered into with respect to specific open position(s). Search firms/recruiters submitting resumes to Ironwood Digital on an unsolicited basis shall be deemed to accept this condition, regardless of any other provision to the contrary.
EQUAL OPPORTUNITY
Ironwood Digital is proud to be an equal opportunity employer. We value diversity and anyone seeking employment at Ironwood Digital is considered based on merit, qualifications, competence and talent. We don’t regard color, religion, race, national origin, sexual orientation, ancestry, citizenship, sex, marital or family status, disability, gender, or any other legally protected status when making our hiring decisions. If you have a disability or special need that requires accommodation, please let us know.