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.

What's Exciting About the Role

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.

Job Description

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.

Required Skills and Experience Programming Languages

• Java 17 or higher

Frameworks and Libraries

• 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

API & Data

• Design and governance ofRESTful APIs, JSON, and HTTP standards
• API versioning and backward compatibility strategies
• MongoDB / NoSQLexpertise, 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, andCloudWatch
• 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

Experience Level

• 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

Preferred Skills and Experience Payments & Domain Expertise

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

Eventing & Distributed Systems

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

Platform & Technical Leadership

• Deep experience with AWS, Docker, and CI/CD practices
• Proven ability to mentor engineers and raise the technical bar across teams
• Strong sense of ownership for systems running in production

Our Commitment

Verifone is committed to creating a diverse environment and is proud to be an equal opportunity employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, gender, gender identity or expression, sexual orientation, national origin, genetics, disability, age, or veteran status. Verifone is also committed to compliance with all fair employment practices regarding citizenship and immigration status.

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