Senior Kotlin Developer (Fintech)

DataArt is a company that delivers innovative and accessible financial solutions for today's consumers.

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.

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.
Strong command of English in both oral and written communication; ability to lead technical discussions.

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.

Vacation as per the laws of your country.
Health insurance policy for you and your loved ones.
10 days of sick pay without a doctor's note, afterwards - as per the laws of your country.
Time off for state holidays according to the official calendar, regardless of the client’s schedule.
Pleasant environment with two large corporate parties and many small get-togethers for colleagues.
Comfort service solving technical and everyday problems at work.

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