Senior Software Engineer in London

For more than 30 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 offers a diverse, dynamic, and fast‑paced work environment where employees are focused on results and have opportunities to excel. We take pride in working with leading retailers, merchants, banks, and third‑party partners to invent and deliver innovative payment solutions around the world. We strive for excellence in our products and services and are obsessed with customer happiness.

This London‑based role sits at the core of Verifone's payments and checkout platform, where backend engineering directly impacts how secure, high‑volume transactions are executed globally. As a Senior Software Engineer, you will help design and operate scalable, production‑critical systems that must perform reliably under real‑world load and strict security requirements.

The payments landscape is evolving rapidly, and this role exists to ensure our backend platforms remain resilient, flexible, and ready to support new payment methods, partners, and regulatory needs. Success in this role is driven by strong backend craft, sound architectural judgment, and close collaboration with Product, Frontend, and Platform teams.

We are seeking a London‑based Senior Software Engineer (TypeScript) to design, build, and operate scalable backend systems supporting payment, checkout, and transactional workflows. This role requires strong production experience with TypeScript, cloud‑native architectures, and modern backend design patterns, with a strong emphasis on reliability, security, and performance in high‑throughput environments.

You will work closely with product, frontend, and platform teams to deliver robust APIs and services that power payment experiences at scale.

• Required Programming Languages: TypeScript (version 3.x or higher)
• Required Frameworks and Libraries: Backend Frameworks or similar alternatives such as Express, Fastify, or NestJS
• Validation: Joi
• Authentication & Authorization: JWT, OAuth2
• Architecture & Design Patterns: Clean Architecture, Dependency Injection (e.g., InversifyJS), Repository Pattern, Domain‑Driven Design (DDD)
• Testing: Mocha / Chai / Sinon or Jest, Cypress (optional)
• Cloud and Infrastructure Requirements: AWS services including EC2, S3, Secrets Manager, and CloudWatch, Docker and Docker Compose
• Strong proficiency with CI/CD pipelines and Git workflows
• Architecture or Greenbox‑Specific Skills: Clean Architecture and DDD mindset for modular backend systems, Understanding of payment and checkout domain flows, Awareness of security constraints, including PCI‑DSS compliance
• Tech Stack Details:

• Data & Caching: MongoDB (modeling, indexing, performance tuning), Redis
• Database migrations and schema evolution
• APIs & Querying: RESTful APIs and API versioning, Advanced filtering using RSQL or equivalent
• Payments & Security: Integration with payment providers such as PayPal, Stripe, Klarna, Authorization, capture, and refund flows, 3D Secure and PCI‑DSS compliance
• Server‑Side Rendering & Widgets: Server‑side rendering using Pug templates, HTML/CSS with SASS or PostCSS, Iframe‑based widget embedding
• Production Engineering: Performance optimization and debugging, Exposure to monitoring and APM tools (preferred)

Minimum Experience Levels: Senior‑level TypeScript backend experience, Typically 5+ years of production experience, Production experience building and operating REST APIs, Production experience with MongoDB and Redis, including performance troubleshooting, Strong discipline with CI/CD, Git workflows, and testing.

Preferred Experience and Bonuses: Fintech, payments, or e‑commerce experience, Fraud detection and high‑availability systems, Frontend experience with Angular or React, including RxJS and NgRx/Redux, Tooling and operations experience with Webpack, AppDynamics, or other APM tools, Messaging systems such as Kafka, RabbitMQ, or Redis Pub/Sub, Internationalization (i18n) systems, Puppeteer for PDF or receipt generation.

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.