Senior Software Engineer

Why Verifone 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. 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. 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. About The Role 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. This 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. Required Skills and Experience Needed Programming Languages TypeScript (version 3.x or higher) Node.js (version 16 or higher) Backend Frameworks & Libraries Backend frameworks such as Hapi.js, or alternatives including Express, Fastify, or NestJS Validation using Joi Authentication and authorization using JWT and OAuth2 Architecture & Design Strong grounding in Clean Architecture and Domain‑Driven Design (DDD) Dependency Injection (e.g., InversifyJS) Repository and modular design patterns Experience building maintainable, testable backend systems APIs & Data Design and operation of RESTful APIs API versioning and request validation Advanced filtering using RSQL or equivalent Experience with MongoDB (modeling, indexing, performance tuning) Experience with Redis for caching or messaging Database migrations and schema evolution Cloud & Infrastructure Hands‑on experience with AWS services such as EC2, S3, Secrets Manager, and CloudWatch Docker and Docker Compose Strong discipline with CI/CD pipelines and Git workflows Testing & Quality Automated testing using Jest or Mocha/Chai/Sinon End‑to‑end testing with Cypress (optional) Strong focus on code quality, reliability, and maintainability Bonus Skills and Experience Payments & Security Experience integrating payment providers such as Stripe, PayPal, or Klarna Knowledge of authorization, capture, and refund flows Experience with 3D Secure Awareness of PCI‑DSS requirements and security best practices Understanding of checkout and transactional domain flows Production Engineering Performance optimization and debugging in production systems Exposure to monitoring or APM tools (e.g., AppDynamics or similar) Experience operating high‑availability or fault‑tolerant systems Familiarity with fraud‑related considerations Frontend & Platform Exposure Experience working alongside frontend frameworks such as Angular or React Familiarity with RxJS and state management (NgRx or Redux) Server‑side rendering with Pug templates HTML/CSS with SASS or PostCSS Iframe‑based widget embedding Additional Bonuses Fintech, payments, or e‑commerce domain experience Messaging systems such as Kafka, RabbitMQ, or Redis Pub/Sub Internationalization (i18n) systems Puppeteer for PDF or receipt generation 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. Offices: London, England, United Kingdom (London);