Senior Software Engineer

PayPal · London, London · hybrid PayPal's Ads Tech team is building a next-generation advertising platform, combining advanced AI, large-scale systems engineering, and PayPal's unique merchant and transaction insights. As a Senior Software Engineer, you'll help design and develop key parts of the platform, shape the technical roadmap, and build reliable systems capable of operating at significant scale. Responsibilities: Design and develop core components of PayPal's advertising platform. Contribute to the technical roadmap and help turn complex requirements into scalable software designs. Build cloud-native backend systems with a strong focus on performance, resilience, and maintainability. Champion software craftsmanship, strong coding standards, and tools that improve code quality. Drive innovation and incremental improvements by taking initiative and challenging existing approaches. Collaborate with Product, Engineering, and other cross-functional teams to navigate ambiguity and deliver meaningful business outcomes. Help create fault-tolerant systems designed for high availability and disaster recovery. Share knowledge, support fellow engineers, and contribute to an inclusive, collaborative engineering culture. Requirements: 10+ years of software development experience, with a strong emphasis on functional programming. Proficiency in at least one functional programming language, ideally Scala and its Typelevel ecosystem. 5+ years of experience designing and architecting scalable backend systems, including cloud-native solutions, microservices, or serverless architectures. Experience with functional effect systems such as Cats Effect or ZIO. Expertise in building fault-tolerant, highly available systems and planning for disaster recovery. Hands-on experience with at least one major cloud platform, such as AWS, Google Cloud, or Microsoft Azure. Experience developing large-scale, high-performance systems. Experience working within Agile or Scrum software-development environments. Benefits: Comprehensive, choice-based programs to support all aspects of personal wellbeing. Generous paid time off. Healthcare coverage for you and your family. Resources to create financial security and support your mental health.