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.

Responsibilities

Engineers in this role:

• Work primarily in mobs, sharing ownership of design and...