Senior Software Developer

Senior Developer – Global Payment Gateway System

Why Verifone

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.

What’s Exciting About the Role

This London‑based role is part of Verifone’s global payment gateway platform, where engineering decisions directly impact the reliability, security, and performance of high‑volume financial transactions worldwide. You will work on backend services that sit at the core of payment processing, balancing scalability, data consistency, and security in a highly regulated environment.

The role is ideal for a senior backend developer who enjoys working on complex distributed systems, modern Java platforms, and cloud‑native architectures, and who takes ownership of systems that must perform reliably under real‑world load.

Job Description

We are seeking a Senior Developer based in London to design, build, and operate backend services for our global payment gateway system. You will develop high‑performance, secure microservices using Java and Spring Boot, collaborate closely with platform, product, and infrastructure teams, and help ensure our systems scale reliably across regions and partners.

Required Skills and Experience

Programming Languages

• Java 17 or higher

Frameworks and Libraries

• Spring Boot

• Spring Web (REST APIs)

• Spring Data

• Spring Security with JWT / OAuth2

Architecture & System Design

• Microservice‑based architectures

• Clean code practices and SOLID principles

• Experience designing scalable, fault‑tolerant backend services

• Strong understanding of security, authentication flows, and data protection

API & Data

• RESTful API design using JSON and HTTP standards

• API versioning strategies

• MongoDB / NoSQL experience, including:

• Data modeling

• Indexing strategies

• Performance tuning

• Experience with Java concurrency, streams, and performance optimization

Cloud & Infrastructure

• AWS services including EC2, ECS/EKS, S3, RDS and/or DynamoDB, and CloudWatch

• Docker and containerized deployments

• CI/CD pipelines and Git‑based workflows

Testing & Engineering Practices

• Unit and integration testing using JUnit and Mockito

• Strong focus on testability, quality, and maintainability

• Experience working in Agile / Scrum environments

Preferred Skills and Experience

Payments & Domain Experience

• Background in fintech or payments

• Experience handling transactions, payment flows, and financial data

• Understanding of high‑availability, security, and data consistency trade‑offs

Eventing & Distributed Systems

• Exposure to event‑driven architectures

• Messaging or streaming technologies such as:

• Kafka

• AWS SQS

• Similar eventing systems

Platform & Operations

• Advanced experience with AWS, Docker, and CI/CD practices

• Production experience operating distributed systems at scale

• Strong ownership mindset for services 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.