Senior Kotlin Engineer (Event Streaming/Sourcing) – London

Senior Kotlin Software Engineer (Investment Banking) – London/hybrid

Daily rate: £600 – £1000Duration: 6 monthsHybrid: 2 days on siteStart: ASAP

My banking client is looking for 2 experienced Senior Kotlin Software Engineers to join a cloud‑hosted platform team within an investment banking environment. This is a fast‑paced, front‑office‑facing role with a strong emphasis on high‑quality engineering, reliability, and collaborative working practices. The role offers exposure to modern engineering practices and the opportunity to work closely with business stakeholders in a demanding and high‑impact environment.

Key Responsibilities

• Design, develop, test, and maintain backend services using Kotlin
• Contribute across the full software lifecycle: development, integration, and production support
• Implement and support event‑driven architectures, including event sourcing and event streaming
• Work within an Agile/XP environment, utilising pair programming, mob programming, and test‑first development practices
• Build and maintain CI/CD pipelines and deploy services to cloud environments
• Continuously refactor code and uphold high standards of code quality and reliability
• Participate in architectural and technical design discussions
• Collaborate closely with front‑office stakeholders and cross‑functional teams
• Deliver solutions within short timelines and respond to urgent business needs

Essential Skills & Experience

• Strong commercial experience developing production‑grade Kotlin applications (non‑Android)
• Proven experience with Test‑Driven Development (TDD) and test‑first approaches
• Hands‑on experience with event‑driven systems (event streaming and/or event sourcing)
• Experience with CI/CD tools and practices
• Strong background in refactoring legacy code and maintaining clean, maintainable systems
• Experience working in Agile/XP environments, ideally including mob programming
• Excellent communication skills with the ability to engage effectively with business/front‑office stakeholders

Desirable Skills & Experience

• Prior experience in investment banking or financial services, particularly front‑office systems
• Experience with cloud platforms (AWS, GCP, or Azure)
• Familiarity with containerisation technologies (Docker, Kubernetes)
• Experience with Kafka or similar messaging/event platforms
• Understanding of distributed systems design and immutable event patterns
• Experience with observability, monitoring, and incident response tools
• Exposure to low‑latency or high‑availability systems

Rates depend on experience and client requirements

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