Senior Software Engineer - Kotlin

Senior Kotlin Developer (Java, Kafka, AWS) – FinTech

📍 London (Hybrid: 3 days onsite)

💰 Up to £110,000 per year + benefits

About the Company

We’re a fast-growing FinTech 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.

The Role

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)

What You’ll Be Doing

• Designing and building microservices using Kotlin and Java
• Developing event-driven systems using Apache Kafka
• 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

Tech Stack

• Kotlin, Java (Spring Boot / Micronaut or similar)
• Apache Kafka / event-driven architecture
• AWS (EKS, Lambda, S3, RDS, DynamoDB, or similar)
• Docker, Kubernetes, CI/CD pipelines
• Observability tooling (monitoring, logging, tracing)

Essential

• Strong commercial experience with Kotlin and Java backend development
• Experience building distributed or event-driven systems with Kafka
• Hands-on AWS cloud experience
• Experience designing scalable microservices architectures
• Strong understanding of testing, clean code, and engineering best practices

Nice to Have

• Experience in FinTech, payments, or regulated environments
• Kubernetes / container orchestration
• Infrastructure as Code (Terraform, CloudFormation)

What’s On Offer

• Salary up to £110,000
• Hybrid working (3 days London office)
• Bonus + equity options
• Private healthcare
• Generous holiday allowance
• Learning & development budget
• Modern, collaborative engineering culture