Senior Software Engineer

Company: Formula.
Apply for the Senior Software Engineer
Location: London
Job Description:

Senior Software Engineer : £600 Inside IR35 : Hybrid London (3x per week) : Banking client

A major UK bank is seeking Senior Software Engineers to support on a major transformation project to rebuild the payment system, replacing their existing enterprise solution.

The new product will support a broad range of payment methods and channels across both in-person and digital environments.

Key requirements:

  • Specific domain expertise in payment gateway systems
  • deep expertise in Kotlin
  • Solution architecture and design capabilities
  • Taking high level requirements and creating structured backlogs
  • Team leadership experience
  • Up to £600 per day Inside IR35
  • 3 days onsite per week (London)
  • 6 months initial term (subject to extension)

Due to the high volume of applications, not all applicants will receive feedback.

Senior Software Engineer : £600 Inside IR35 : Hybrid London (3x per week) : Banking client

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Posted: September 24th, 2026