Principal Software Engineer

For more than 30 years, Verifone has been a global leader in electronic payment technology. We work with leading retailers, merchants, banks, and technology partners to deliver secure, reliable, and innovative payment solutions worldwide.

Verifone offers a fast‑paced, collaborative environment focused on engineering excellence, customer impact, and continuous innovation. We are proudly an in‑office organization and currently support a hybrid work model, which is reviewed regularly.

We offer a fast‑paced, collaborative environment focused on results, innovation, and customer impact. Verifone is proudly an in‑office culture, with a hybrid work schedule currently available and reviewed regularly.

This London‑based Principal Software Engineer role sits at the heart of Verifone’s global payment gateway platform. You will help shape the technical direction of systems responsible for processing high‑volume, mission‑critical financial transactions worldwide.

At this level, the role goes beyond feature delivery. You will drive architectural decisions, set engineering standards, and influence how teams design, build, and operate secure, scalable backend systems. Success in this role is defined by technical leadership, sound judgment in complex trade‑offs, and ownership of systems that must perform reliably under real‑world load and regulatory constraints.

We are seeking aPrincipal Software Engineer based in Londonto provide technical leadership across backend services supporting our global payment gateway system. You will design and evolve core platform capabilities, guide architectural decisions across microservices, and mentor engineers while remaining hands‑on with critical systems built using Java and Spring Boot.

You will work closely with senior engineering, platform, product, and infrastructure partners to ensure our systems scale globally, remain secure, and meet the highest standards for availability and performance.

• Java 17 or higher

• Spring Boot
• Spring Web(REST APIs)
• Spring Data
• Spring SecuritywithJWT / OAuth2
• Deep experience designing and operatingmicroservice‑based architectures
• Strong application of clean code practices andSOLIDprinciples
• Ownership of system‑level architecture and cross‑service design decisions
• Strong understanding of security, authentication flows, and data protection in distributed systems

• Design and governance ofRESTful APIs, JSON, and HTTP standards
• API versioning and backward‑compatibility strategies
• Mongo
  
  DB / No
  
  SQLexpertise, including:
  • Data modeling
  • Indexing strategies
  • Performance optimization
• Advanced experience with Java concurrency, streams, and performance tuning
• AWS services includingEC2,ECS/EKS,S3,RDS and/or DynamoDB, andCloud Watch
• Dockerand containerized deployments
• CI/CD pipelines and Git‑based workflows
• Experience designing systems for scalability, resilience, and operability
• Strong unit and integration testing practices usingJUnitandMockito
• Ownership of quality standards, testability, and CI discipline
• Experience working inAgile / Scrumenvironments and influencing engineering best practices

• Principal‑level backend engineering experience building and operating large‑scale, high‑performance systems
• Approximately 8+ years of backend development experience, with several years working on production Java and Spring Boot services
• Proven experience owning architecture and technical direction for critical backend platforms
• Extensive production experience withMongoDB, including modeling, indexing, and performance optimization

• Background infintech or payments
• Experience with payment processing, transactions, and financial data
• Strong understanding of high‑availability, security, and data‑consistency trade‑offs

• Experience withevent‑driven architectures
• Messaging or streaming technologies such as:
  • Kafka
  • AWS SQS
  • Similar eventing systems

• Deep experience with AWS, Docker, and CI/CD practices
• Proven ability to mentor engineers and raise the…