Kotlin Engineer

Aether Biomedical; Deutschland; Vor Ort; EUR 70.000 - 100.000; Vollzeit

Benefits dieser Stelle

Vacation days: Up to 26 business days

10 illness/special days off per year

Health and life insurance (Luxmed)

MyBenefit with Multisport

Internal psychological support service

English language classes

Access to learning platforms: O’Reilly

Flexible workplace: office/home/hybrid

Public speaking/mentoring/interviewer

Fully paid idle bench time

Zusammenfassung

Our client is building the bank of the future with cutting-edge technologies. Backend Kotlin engineers work in small, agile teams, designing and maintaining high-quality services using Kotlin and coroutines.

You will participate in code reviews, unit/integration tests, and the full SDLC from concept to deployment, while embracing AI-assisted coding and agile practices. Excellent knowledge of Kotlin, microservices, SQL, and testing patterns is required, with strong English communication and a

Qualifikationen

• Proficiency in production Kotlin code with coroutines in established frameworks.
• Experience with commercial products in production.
• Strong unit and integration testing with JUnit or Kotest.
• Background prioritizing quality, testing, and maintainability under pressure.
• Experience in a microservices architecture and clear service boundaries.
• Ability to write performant SQL queries and understand indexing basics.
• Familiarity with Git workflows and code reviews.
• Basic Docker/Kubernetes experience and deployment concepts.
• Openness to AI coding tools like Claude Code and Copilot.
• Strong English language skills and effective team collaboration.
• Structured problem-solving and proactive risk management.
• Ability to work independently and contribute to team decisions.

Aufgaben

• Design, develop, and maintain backend Kotlin services using established patterns.
• Collaborate with cross-functional teams to define and ship features with coroutines.
• Write meaningful unit and integration tests following project patterns.
• Engage in code reviews and provide constructive feedback on PRs.
• Contribute to whole software development lifecycle including deployment and monitoring.
• Participate in agile practices and squad decisions; embrace continuous improvement.

Kenntnisse

Kotlin

Coroutines

JUnit

Kotest

Microservices

SQL

Git

Docker

Kubernetes

AI Tools

English

Teamwork

Problem Solving

Tools

Kafka

AWS

Jobbeschreibung

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.

What We Offer

• Vacation days: Up to 26 business days per year.
• 10 illness/special days off per year (fully paid, no medical papers needed) for all contract types
• Health and life insurance (Luxmed)
• MyBenefit platform with Multisport option
• Internal psychological support service
• English language classes from the first working day
• Access to external learning platforms: O’Reilly, LinkedIn Learning, Udemy, and a wide catalog of diverse internal training
• Flexible workplace: work from the office, from home, or choose a hybrid option
• Opportunities to develop as a public speaker, mentor, or technical interviewer
• Fully paid idle (bench) when not involved in a project

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