Job Description
Interim Software Engineer - Kotlin Rate: £800 p/d (Inside IR35) Duration: 6-month Contract Location: London (Hybrid) Client: Investment Banking Technology An Interim Senior Software Engineer, to join a high-performing front-office engineering team delivering a next-generation cloud-native issuance platform for global capital markets. This platform is replacing a legacy bookbuilding system used by investment banking teams worldwide and supports high-volume, real-time workflows during critical trading windows. The engineering environment is collaborative, fast-paced, and strongly aligned to Extreme Programming (XP) principles. The Role This is a hands-on senior engineering position focused on designing, building, and evolving backend services in Kotlin within a modern cloud-native architecture. You will work closely with engineers, product specialists, and business stakeholders to deliver resilient, scalable solutions that support real-time issuance and allocation workflows. The role places strong emphasis on: Mob programming Test-driven development (TDD) Continuous refactoring Collective ownership Incremental delivery Production excellence Key Responsibilities Design, develop, and maintain backend services in Kotlin Contribute to event-driven and event-sourced platform architecture Collaborate within mob programming sessions as a primary delivery model Deliver high-quality, well-tested, maintainable code Support and improve production systems with strong reliability requirements Participate in CI/CD and SDLC practices within an enterprise environment Work closely with stakeholders to deliver incremental business features Use incidents and operational feedback to improve system resilience and design Required Skills & Experience Strong commercial experience building backend services using Kotlin Deep understanding of event-driven and/or event-sourced architectures Extensive experience with XP engineering practices Strong cloud engineering experience within GCP environments Experience working within regulated or enterprise-scale environments Comfortable supporting high-availability production systems Strong communication and collaboration skills This is an opportunity to work on a business-critical platform used globally, within a modern Cloud-native engineering environment. Note: Applicants must hold current and valid UK Right to Work If interested, please apply asap and any questions, email claire.shipman@1st-executive.com