Senior Fintech Billing Engineer - Go Microservices

Cloudflare; Lisboa; On-site; EUR 90,000 - 120,000; Full time

Job summary

Cloudflare in Lisbon, Portugal is seeking a Senior Software Engineer for the Fintech billing team to design and build reliable financial infrastructure supporting metering, subscriptions, invoicing, payments, and revenue recognition.

You will own projects end-to-end, drive architectural decisions, and ensure accuracy and scalability as Cloudflare grows; focus on Go, REST APIs, and secure microservices in Linux environments.

Qualifications

• Five or more years of professional software engineering experience, or equivalent practical experience.
• Experience building and operating distributed systems or backend services in production.
• Proficiency in Go or another modern programming language, with an interest in working extensively with Go.
• Strong understanding of RESTful APIs, service security, and API standards such as OpenAPI, OAuth, or JWT.
• Working knowledge of SQL, data modeling, and relational databases such as PostgreSQL or MySQL.
• Experience designing secure, highly available microservices in Linux or Unix environments.
• Familiarity with event-driven architectures and asynchronous processing.
• Strong troubleshooting, communication, and project ownership skills.

Responsibilities

• Build Billing Systems: Design, develop, and operate transactional microservices supporting metering, subscriptions, invoicing, payments, and financial workflows.
• Own Projects End to End: Drive initiatives from requirements and technical design through implementation, testing, deployment, and ongoing operation.
• Ensure Accuracy and Reliability: Build fault-tolerant systems that safely handle retries, failures, concurrency, and high transaction volumes while preserving financial correctness.
• Maintain Operational Excellence: Monitor production services, investigate billing issues, improve observability, and address the underlying causes of recurring incidents.
• Shape Technical Direction: Participate in architecture reviews, make pragmatic technical trade-offs, and help improve engineering standards across the billing platform.
• Collaborate Cross-Functionally: Work with Product, Finance, Accounting, Support, and other engineering teams to turn complex business requirements into maintainable solutions.

Skills

Five+ years experience

Distributed systems

Go

REST APIs

SQL

Linux/Unix

Event-driven

Troubleshooting

Tools

PostgreSQL

Redis

Kafka

Kubernetes

Docker

Temporal

Job description

Cloudflare in Lisbon, Portugal is seeking a Senior Software Engineer for the Fintech billing team to design and build reliable financial infrastructure supporting metering, subscriptions, invoicing, payments, and revenue recognition.

You will own projects end-to-end, drive architectural decisions, and ensure accuracy and scalability as Cloudflare grows; focus on Go, REST APIs, and secure microservices in Linux environments.