Senior Software Engineer - Kotlin

Senior Kotlin Developer (Java, Kafka, AWS) – Fin Tech

London (Hybrid: 3 days onsite)

Up to £110,000 per year + benefits

We’re a fast-growing Fin Tech building modern, cloud-native platforms that power real-time financial services used by thousands of customers daily. Our engineering culture is collaborative, pragmatic, and focused on delivering high-quality, scalable systems.

We’re looking for a Senior Kotlin Developer to help design and build resilient backend services that process high-volume financial data in real time. You’ll work closely with product, platform, and data teams to deliver robust distributed systems in a cloud-first environment.

This is a hybrid role based in London (3 days per week in the office)

• Designing and building microservices using Kotlin and Java
• Deploying and operating services on AWS
• Improving system performance, reliability, and scalability
• Contributing to architecture decisions and best practices
• Mentoring engineers and supporting a strong engineering culture
• Kotlin, Java (Spring Boot / Micronaut or similar)
• Apache Kafka / event-driven architecture
• AWS (EKS, Lambda, S3, RDS, Dynamo
  
  DB, or similar)
• Observability tooling (monitoring, logging, tracing)
• Strong commercial experience with Kotlin and Java backend development
• Experience building distributed or event-driven systems with Kafka
• Strong understanding of testing, clean code, and engineering best practices

• Experience in Fin Tech, payments, or regulated environments
• Infrastructure as Code (Terraform, Cloud Formation)

• Salary up to £110,000
• Hybrid working (3 days London office)
• Bonus + equity options
• Modern, collaborative engineering culture