Senior Java / Kotlin Engineer
London - 3 days a week in the office.
Experience - Senior (5+ years experience).
Job Overview
We are seeking a Senior Java / Kotlin Engineer to join our London-based fintech engineering team. You will be responsible for designing and building highly scalable, secure, and resilient backend systems that power modern financial products used by thousands of customers.
This role is ideal for an engineer with strong JVM experience who thrives in high-throughput, regulated environments and enjoys solving complex technical challenges.
Key Responsibilities
* Design, develop, and maintain high-performance backend services using Java and/or Kotlin.
* Extensive experience with AWS.
* Build and evolve microservices-based architectures for financial platforms.
* Develop and maintain RESTful APIs and event-driven services.
* Ensure systems meet security, reliability, and compliance requirements.
* Collaborate closely with product, frontend, DevOps, and QA teams.
* Improve system performance, scalability, and fault tolerance.
* Write clean, well-tested, and maintainable code.
* Participate in architecture discussions, code reviews, and mentoring.
* Support production systems and contribute to incident resolution.
Required Skills & Experience
* 5+ years of commercial experience with Java (Spring/Spring Boot) and/or Kotlin.
* Strong knowledge of JVM internals, concurrency, and performance tuning.
* Strong experience with AWS.
* Experience building microservices and distributed systems.
* Solid understanding of REST APIs and backend integration patterns.
* Experience with relational databases (PostgreSQL, MySQL, or Oracle).
* Familiarity with message queues/streaming platforms (Kafka, RabbitMQ, etc.).
* Strong understanding of security best practices and secure API design.
* Experience working with Git and modern CI/CD pipelines.
* Comfortable working in Linux-based environments.
Nice to Have
* Experience in fintech, banking, payments, or capital markets.
* Exposure to event-driven architectures.
* Experience with Docker and Kubernetes.
* Cloud experience (AWS preferred).
* Knowledge of financial regulations (PCI-DSS, PSD2, FCA, GDPR).
* Experience with monitoring tools (Prometheus, Grafana, Datadog).
Seniority level
Mid-Senior level
Employment type
Full-time
Job function
Information Technology
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