via reed · 29 May 2026 ·8 days ago

Senior Kotlin Engineer (XP, GCP) - Investment Banking - London

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London Contract GBP 130,000 – 208,000
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Senior Kotlin Engineer (XP, GCP) - Investment Banking - London/Hybrid

Daily rate: £600 - £800 (inside IR35)

Duration: 6 months

Start: ASAP

My client is looking for an experienced Senior Kotlin engineer to support and extend a cloud-hosted platform used for bookbuilding issuances within Investment Banking Capital Markets. You will join a high-calibre London-based front office engineering team working on a next-generation issuance platform replacing a legacy bookbuilding system.

This is a hands-on engineering role with a strong emphasis on Extreme Programming (XP) practices, including mob programming, test-driven development, and continuous refactoring. Engineers are expected to contribute across development, integration, and production support, collaborating closely to maintain high standards of code quality, system reliability, and performance.

Required & Desirable Skills

  • Strong commercial experience building backend services using Kotlin

  • Experience with event-sourced and event-driven architectures

  • Deep familiarity with XP practices, including: • Mob programming as a primary way of working

  • Test-driven development (TDD)

  • Continuous refactoring and clean code principles

  • Cloud experience with GCP, including: • GKE and/or Cloud Run

  • Cloud SQL and Memory store

  • Artifact Registry and Cloud Logging

  • Key Management

  • Experience with CI/CD and SDLC in regulated or enterprise environments

  • Comfortable working on production systems requiring high availability and accuracy

Engineers in this role:
  • Work primarily in mobs, sharing ownership of design and code

  • Build, test, and evolve services with a strong focus on clarity, simplicity, and maintainability

  • Support the platform in production, using incidents and defects as opportunities to improve system design and resilience

*Rates depend on experience and client requirements

This listing is from reed. View original listing ↗

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