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Senior Kotlin

  • Almaty
  • Astana
  • Belgrade
  • Cluj-Napoca
  • Krakow
  • Larnaca
  • Lodz
  • Lublin
  • Remote.Bulgaria
  • Remote.Kazakhstan
  • Remote.Poland
  • Riga
  • Sofia
  • Varna
  • Warsaw
  • Wroclaw
Small team (1-10 people)

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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.

Join a great company, not merely an individual project

Project 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.

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 (9am to 5:30pm 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; own architectural decision-making and complex feature delivery using coroutines and existing frameworks.
  • Define testing strategy for features or services, improve test design across the squad, identify gaps in coverage or reliability, and ensure new work meets agreed quality standards (JUnit, Kotest).
  • Conduct thorough and high-quality code reviews, improving team-wide code standards.
  • Participate in the full software development lifecycle, from concept and design to testing and deployment; ensure production readiness and stability, owning monitoring and incident response.
  • Engage in continuous improvement practices and agile methodologies; shape technical direction, raise standards, and influence architectural choices.
  • Mentor and support other engineers; lead technical discussions.
  • Embrace effective agentic coding practices and actively leverage AI tools such as Claude Code and Copilot.

Requirements

  • 2+ years in writing production Kotlin code and implementing features using coroutines.
  • Experience working on commercial, established products used by real customers, and operating software in production.
  • Strong knowledge of testing strategies with tools like JUnit or Kotest; able to define and improve squad-wide test coverage.
  • Backgrounds where quality, testing, and maintainability were prioritised alongside delivery, even under time or commercial pressure.
  • Experience making architectural trade-offs (e.g. consistency vs availability, sync vs async) and being accountable for the long-term maintainability of those decisions.
  • Deep understanding of relational database schema design, indexing, performance optimization, and migration integrity.
  • Advanced Git skills including branching strategy enforcement and complex merge resolution.
  • Proficient in Docker and Kubernetes deployment patterns, troubleshooting, and platform-level reliability improvements.
  • Strong command of English in both oral and written communication; ability to lead technical discussions.
  • Proactive risk management and structured problem-solving mindset.
  • Effective team player with the ability to work independently; supports and mentors others.
  • Ownership of complex or ambiguous initiatives end-to-end.

Nice to have

  • Strong experience with Kafka and event-driven architectures; comfortable with advanced patterns (dead letter queues, schema evolution, exactly once semantics).
  • 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

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We offer

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Vacation

As per the laws of your country. We do ask you to take a proper rest

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Health insurance

We help you to take out an insurance policy for you and your loved ones

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Sick pay

10 days without a doctor's note, afterwards - as per the laws of your country

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Time off for state holidays

According to the official calendar, regardless of the client’s schedule

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Pleasant environment

Two large corporate parties and many small get-togethers for colleagues

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Comfort service

Solving technical and everyday problems at work

The benefits package may vary depending on the region and the type of contract
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