Interim Software Engineer – Kotlin
Rate: £630 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.
Focus Areas
- Mob programming
- Test-driven development (TDD)
- Continuous refactoring
- Collective ownership
- Incremental delivery
- Production excellence
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.
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 codeSupport 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
Note: Applicants must hold current and valid UK Right to Work
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