Senior Software Engineer London, England, United Kingdom

<p>This London based role sits at the core of Verifone's payments and checkout platform, where backend engineering directly impacts secure, high volume transactions used globally. You'll design and operate scalable, production critical systems that must perform reliably under real world load, evolving payment methods, and strict security requirements.</p> Job Description <p>We are seeking a London based Senior Software Engineer (Node.js / TypeScript) to build and operate backend services supporting payment, checkout, and transactional workflows. You will collaborate closely with Product, Frontend, Platform, and Infrastructure teams to deliver secure, scalable APIs in high throughput environments.</p> Required Skills and Experience Programming Languages <ul> <li><b>TypeScript</b> (version 3.x or higher)</li> <li><b>Node.js</b> (version 16 or higher)</li> <li>Backend frameworks such as <b>Hapi.js</b>, or alternatives including <b>Express</b>, <b>Fastify</b>, or <b>NestJS</b></li> <li>Authentication and authorization using <b>JWT</b> and <b>OAuth2</b></li> <li>Repository and modular design patterns</li> <li>Experience building maintainable, testable backend systems</li> </ul> APIs & Data <ul> <li>Design and operation of <b>RESTful APIs</b></li> <li>API versioning and request validation</li> <li>Advanced filtering using <b>RSQL</b> or equivalent</li> <li>Experience with <b>MongoDB</b> (modeling, indexing, performance tuning)</li> <li>Experience with <b>Redis</b> for caching or messaging</li> <li>Database migrations and schema evolution</li> <li>Hands on experience with <b>AWS</b> services such as EC2, S3, Secrets Manager, and CloudWatch</li> <li><b>Docker</b> and <b>Docker Compose</b></li> <li>Strong discipline with <b>CI/CD pipelines</b> and <b>Git workflows</b></li> </ul> Testing & Quality <ul> <li>Automated testing using <b>Jest</b> or <b>Mocha/Chai/Sinon</b></li> <li>End to end testing with <b>Cypress</b> (optional)</li> <li>Strong focus on code quality, reliability, and maintainability</li> </ul> Preferred Skills and Experience Payments & Security <ul> <li>Experience integrating payment providers such as <b>Stripe</b>, <b>PayPal</b>, or <b>Klarna</b></li> <li>Knowledge of authorization, capture, and refund flows</li> <li>Experience with <b>3D Secure</b></li> <li>Awareness of <b>PCI DSS</b> requirements and security best practices</li> <li>Understanding of checkout and transactional domain flows</li> </ul> Production Engineering <ul> <li>Performance optimization and debugging in production systems</li> <li>Exposure to monitoring or <b>APM tools</b> (e.g., AppDynamics or similar)</li> <li>Experience operating high availability or fault tolerant systems</li> <li>Familiarity with fraud related considerations</li> </ul> Frontend & Platform Exposure <ul> <li>Experience working alongside frontend frameworks such as <b>Angular</b> or <b>React</b></li> <li>Familiarity with <b>RxJS</b> and state management (NgRx or Redux)</li> <li>Server side rendering with <b>Pug templates</b></li> <li>HTML/CSS with <b>SASS</b> or <b>PostCSS</b></li> </ul> Additional Bonuses <ul> <li>Fintech, payments, or e commerce domain experience</li> <li>Messaging systems such as <b>Kafka</b>, <b>RabbitMQ</b>, or <b>Redis Pub/Sub</b></li> <li><b>Puppeteer</b> for PDF or receipt generation</li> </ul> Our Commitment <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> Global Demographic Sets (Non US) <p>You are invited to voluntarily self identify the following personal data points. Verifone is an equal opportunity employer that is committed to diversity and inclusion. We are dedicated to providing unbiased and fair work opportunities to employees irrespective of their race, age, gender, religion, or ethnicity. As such, voluntarily providing this information helps the company generate the most accurate EEO data to ensure we are upholding these goals. Even if you wish to keep this data private, you have the opportunity to participate in our efforts by selecting our "Do not wish to answer" option in the fields below.</p> <p>Submission of this information is voluntary and refusal to provide it will not subject you to any adverse treatment. The information is kept confidential and is only used in accordance with provisions of applicable laws, executive orders and regulations, including those that require information to be summarized and reported to the federal government for civil rights enforcement. When reported, data will not identify any specific individual.</p> <p>Do you have a disability or chronic condition (physical, visual, auditory, cognitive, mental, emotional, or other) that substantially limits one or more of your major life activities, including mobility, communication (seeing, hearing, speaking), and learning that affect your ability to work? 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