Middle Kotlin (9am to 5:30pm UK time)

Client

Our client, a UK-based digital bank, delivers innovative and accessible financial solutions for today's consumers. Known for its user-friendly platform and customer-centered approach, it helps people manage finances with ease and transparency. Recent expansions into flexible payment options and new services strengthen its role as a leader in the UK's digital banking sector.

Position overview

The client is building the bank of the future with cutting-edge technologies. Backend Java/Kotlin engineers work in small, agile, cross-functional teams that tackle real-world problems and interact closely with stakeholders and key business users. They design, develop, and maintain high-quality backend services using Kotlin.

The working schedule is aligned with the UK time zone (9 am to 5:30 pm UK time) and involves participating in on-call shifts if required.

Responsibilities

• Design, develop, and maintain high-quality backend services using Kotlin under established patterns.

• Work closely with cross-functional teams to define, design, and ship new features using coroutines and existing frameworks.

• Write meaningful unit and integration tests for your own features, within test boundaries and following existing testing patterns (JUnit, Kotest).

• Participate constructively in code reviews; provide feedback on assigned PRs.

• Participate in the full software development lifecycle, from concept and design to testing and deployment; support release and monitoring processes.

• Engage in continuous improvement practices and agile methodologies; contribute to decisions within the squad.

• Embrace effective agentic coding practices and actively leverage AI tools such as Claude Code and Copilot.

Requirements

• Confident in writing production Kotlin code and implementing features using coroutines within established frameworks.

• Experience working on commercial, established products used by real customers, and operating software in production.

• Knowledge of unit and integration testing with JUnit or Kotest.

• Backgrounds where quality, testing, and maintainability were prioritised alongside delivery, even under time or commercial pressure.

• Experience implementing features within an existing microservices architecture, understanding service boundaries and following established design principles.

• Ability to write performant SQL queries and understanding of indexing basics.

• Familiarity with Git branching strategies and participation in code review workflows.

• Basic experience with building and running services using existing Docker and Kubernetes configurations; a basic understanding of how deployments are structured.

• Openness to using AI coding tools (e.g. Claude Code, Copilot) to support delivery.

• Strong command of English in both oral and written communication; ability to participate in team discussions.

• Structured problem-solving skills; proactivity in resolving assigned tasks and raising risks and blockers early.

• Effective team player with experience working as part of a team of engineers, with shared ownership, regular feedback, and exposure to different perspectives.

• Ability to work independently on assigned tasks.

• Ability to participate in team discussions and contribute to decisions within the team.

Nice to have

• Familiarity with Kafka.

• AWS Experience.

• Understanding event-driven patterns and async messaging (pub/sub, message queues); experience consuming or producing messages in at least one messaging platform.

• Openness to define and optimize test and deployment pipelines.

• time spent working across multiple teams, products, or problem spaces, helping to build adaptability

• evidence of evolving practices, responsibilities, or environments over time rather than working in one project

• experience in organisations where engineers were embedded in teams, accountable for outcomes, and closely aligned with product and delivery goals.