Principal Software Engineer at Verifone

<div> <h2><span style="color: rgb(35, 111, 161);">Why Verifone</span></h2> <p>For more than 40 years Verifone has established a remarkable record of leadership in the electronic payment technology industry. Verifone has one of the leading electronic payment solutions brands and is one of the largest providers of electronic payment systems worldwide.</p> <p>Verifone has a diverse, dynamic and fast paced work environment in which employees are focused on results and have opportunities to excel. We take pride in the fact that we work with leading retailers, merchants, banks, and third party partners to invent and deliver innovative payments solution around the world. We strive for excellence in our products and services, and are obsessed with customer happiness. Across the globe, Verifone employees are leading the payments industry through experience, innovation, and an ambitious spirit. Whether it’s developing the next platform of secure payment systems or searching for new ways to bring electronic payments to new markets, the team at Verifone is dedicated to the success of our customers, partners and investors. It is this passion for innovation that drives each one of our employees for personal and professional success.</p> <p><span data-teams="true">Verifone is proudly an in-office work culture as we see immense benefits to career development and business results from our colleagues being physically co-located.</span></p> </div> <h2><span style="color: rgb(35, 111, 161);">About The Role</span></h2> <p><span style="color: rgb(35, 111, 161);"><span style="color: rgb(0, 0, 0);">We are seeking a<span class="Apple-converted-space">&nbsp;</span><strong>Principal Software Engineer </strong>based in London<span class="Apple-converted-space">&nbsp;</span>to 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.</span></span></p> <p>This 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.</p> <p>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.</p> <p>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.</p> <h2><span style="color: rgb(35, 111, 161);">Required Skills and Experience Needed</span></h2> <h4>Programming Languages</h4> <ul> <li>Java 17 or higher</li> </ul> <h4>Frameworks and Libraries</h4> <ul> <li>Spring Boot</li> <li>Spring Web<span class="Apple-converted-space">&nbsp;</span>(REST APIs)</li> <li>Spring Data</li> <li>Spring Security<span class="Apple-converted-space">&nbsp;</span>with<span class="Apple-converted-space">&nbsp;</span>JWT / OAuth2</li> </ul> <h4>Architecture &amp; System Design</h4> <ul> <li>Deep experience designing and operating<span class="Apple-converted-space">&nbsp;</span>microservice‑based architectures</li> <li>Strong application of clean code practices and<span class="Apple-converted-space">&nbsp;</span>SOLID<span class="Apple-converted-space">&nbsp;</span>principles</li> <li>Ownership of system‑level architecture and cross‑service design decisions</li> <li>Strong understanding of security, authentication flows, and data protection in distributed systems</li> </ul> <h4>API &amp; Data</h4> <ul> <li>Design and governance of<span class="Apple-converted-space">&nbsp;</span>RESTful APIs, JSON, and HTTP standards</li> <li>API versioning and backward‑compatibility strategies</li> <li>MongoDB / NoSQL<span class="Apple-converted-space">&nbsp;</span>expertise, including: <ul> <li>Data modeling</li> <li>Indexing strategies</li> <li>Performance optimization</li> </ul> </li> <li>Advanced experience with Java concurrency, streams, and performance tuning</li> </ul> <h4>Cloud &amp; Infrastructure</h4> <ul> <li>AWS services including<span class="Apple-converted-space">&nbsp;</span>EC2,<span class="Apple-converted-space">&nbsp;</span>ECS/EKS,<span class="Apple-converted-space">&nbsp;</span>S3,<span class="Apple-converted-space">&nbsp;</span>RDS and/or DynamoDB, and<span class="Apple-converted-space">&nbsp;</span>CloudWatch</li> <li>Docker<span class="Apple-converted-space">&nbsp;</span>and containerized deployments</li> <li>CI/CD pipelines and Git‑based workflows</li> <li>Experience designing systems for scalability, resilience, and operability</li> </ul> <h4>Testing &amp; Engineering Practices</h4> <ul> <li>Strong unit and integration testing practices using<span class="Apple-converted-space">&nbsp;</span>JUnit<span class="Apple-converted-space">&nbsp;</span>and<span class="Apple-converted-space">&nbsp;</span>Mockito</li> <li>Ownership of quality standards, testability, and CI discipline</li> <li>Experience working in<span class="Apple-converted-space">&nbsp;</span>Agile / Scrum<span class="Apple-converted-space">&nbsp;</span>environments and influencing engineering best practices</li> </ul> <h2><span style="color: rgb(35, 111, 161);">Experience Level</span></h2> <ul> <li>Principal‑level backend engineering experience building and operating large‑scale, high‑performance systems</li> <li>Approximately 8+ years of backend development experience, with several years working on production Java and Spring Boot services</li> <li>Proven experience owning architecture and technical direction for critical backend platforms</li> <li>Extensive production experience with<span class="Apple-converted-space">&nbsp;</span>MongoDB, including modeling, indexing, and performance optimization</li> </ul> <h2><span style="color: rgb(35, 111, 161);">Bonus Skills and Experience</span></h2> <h4>Payments &amp; Domain Expertise</h4> <ul> <li>Background in<span class="Apple-converted-space">&nbsp;</span>fintech or payments</li> <li>Experience with payment processing, transactions, and financial data</li> <li>Strong understanding of high‑availability, security, and data‑consistency trade‑offs</li> </ul> <h4>Eventing &amp; Distributed Systems</h4> <ul> <li>Experience with<span class="Apple-converted-space">&nbsp;</span><strong>event‑driven architectures</strong></li> <li>Messaging or streaming technologies such as: <ul> <li><strong>Kafka</strong></li> <li><strong>AWS SQS</strong></li> <li>Similar eventing systems</li> </ul> </li> </ul> <h4>Platform &amp; Technical Leadership</h4> <ul> <li>Deep experience with AWS, Docker, and CI/CD practices</li> <li>Proven ability to mentor engineers and raise the technical bar across teams</li> <li>Strong sense of ownership for systems running in production</li> </ul> <h2><span style="color: rgb(35, 111, 161);">Our Commitment</span></h2> <p>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.</p>