Our partner is looking for a Backend Engineer (Billing) based in Spain. Join a fast-growing fintech engineering team building a new-generation billing platform from the ground up. The role gives you ownership over foundational billing infrastructure, public APIs, pricing engines, and revenue recovery systems.

Working primarily in Go, you will collaborate with experienced engineers and cross-functional specialists in a newly established Billing Stream. This is a high-impact environment where strong engineering practices, automated testing, reliability, and continuous delivery are central to how products are built. Build high-precision volume and graduated pricing engines capable of supporting complex, multi-tier enterprise billing requirements.

Design and implement resilient billing services that minimize dependencies and eliminate critical single points of failure. Develop reliable, scalable backend services capable of operating in high-load environments. Contribute to the evolution of the Billing 2.0 platform and help establish its architecture, standards, and engineering practices.

Write and maintain comprehensive automated tests across unit, integration, functional, and end-to-end levels. Collaborate closely with product management, engineering, QA, and domain specialists to deliver billing capabilities end to end. Help build a modern, maintainable billing infrastructure with a strong focus on performance, reliability, and operational excellence.



2+ years of backend engineering experience using Go, PHP, Kotlin, Java, Python, Node.js, or a comparable backend technology. both experienced Go engineers and strong engineers transitioning from another backend language are encouraged to apply.

Demonstrated experience writing and maintaining automated tests, including unit, integration, functional, and end-to-end tests. Strong understanding of high-load system design principles and scalable backend architecture.

Experience working with PostgreSQL and queues or streaming technologies. Familiarity with Kafka , AWS services, and CI/CD pipelines is advantageous. Comfortable working in a collaborative engineering environment with code reviews, automated testing, observability, metrics, alerts, and continuous delivery.

Opportunity to work on financial infrastructure supporting modern internet businesses across subscriptions, payments, chargebacks, fraud prevention, and indirect tax. Modern engineering culture focused on technical discussions, code reviews, strong testing practices, metrics, alerts, and fully automated CI/CD. Health coverage .

Free office meals .

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📌 Backend Engineer (Billing) (Madrid)
🏢 Jobgether
📍 Madrid