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# Senior Software Engineer

- **Company:** Verifone
- **Location:** London, UK
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** JavaScript (Programming Language), Multitier Architecture, Application Programming Interfaces (APIs), Amazon Elastic Compute Cloud, Amazon S3, User Authentication, Automation of Tests, Cloud Computing, Software Quality, Software Debugging, Dependency Injection, Fault Tolerance, Enterprise Messaging Systems, Modular Design, MongoDB, Node.Js, OAuth, PCI Data Security Standards, Performance Tuning, RabbitMQ, Redis, E2e Testing, TypeScript, Management of Software Versions, RxJS, Sinon, ReactJS, Cypress (Programming Language), Caching, Indexer, Puppeteer (Software), Backend, Database Migration, Syntactically Awesome Style Sheets (SASS), Stripe, AngularJS, Git Flow, Apache Kafka, Front End Software Development, Iframes, React Redux, Verifone, Cloudwatch, NestJS, Restful APIs, Domain Driven Design, Mocha, Appdynamics, Docker, Programming Languages
- **Published:** May 26, 2026
- **Apply:** https://www.apply4u.co.uk/jobs/x/37374815/

## About the Role

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

## Description

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.


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