Senior Kotlin Engineer (Fintech)

TL;DR

Senior Kotlin Engineer (Fintech): Building and optimizing high-load backend services for a UK-based digital bank with an accent on API design, database performance, and scalability. Focus on microservices architecture, solving complex concurrency challenges, and ensuring system reliability under heavy traffic using TDD.

Location: Remote from Bulgaria or Poland, or onsite in Belgrade, Cluj-Napoca, Krakow, Lodz, Lublin, Riga, Sofia, Varna, Warsaw, Wroclaw. Working schedule aligns with UK time zone (9:00 AM to 5:30 PM UK time).

Company

hirify.global is an outsourcing company partnering with a UK-based digital bank that delivers innovative and accessible financial solutions for modern consumers, expanding into flexible payment options and new services.

What you will do

• Design, develop, and maintain high-quality backend services using Kotlin.
• Collaborate with cross-functional teams to define, design, and deliver new features.
• Optimize application performance, quality, and responsiveness.
• Conduct code reviews and ensure robust code quality with a strong emphasis on Test-Driven Development (TDD) using Kotest or JUnit.
• Participate in the full software development lifecycle from concept to deployment.
• Use Git for efficient collaboration and engage in agile methodologies.

Requirements

• 5+ years of software development experience with a focus on backend services.
• Knowledge of Kotlin and its use in a professional environment.
• Proven experience with Test-Driven Development (TDD) and frameworks like Kotest or JUnit.
• Experience with Kotlin-specific frameworks such as Ktor and Coroutines.
• Solid understanding of microservices architecture, PostgreSQL, Docker, and Kubernetes.
• Proficiency with code versioning tools like Git and build tools such as Gradle or Maven.
• Strong command of English both written and spoken with the ability to contribute clearly to team discussions.

Nice to have

• Experience with Kafka.

Culture & Benefits

• Vacation and sick pay as per local laws, with 10 days sick leave without a doctor's note.
• Health insurance assistance for you and your loved ones.
• Time off for state holidays according to the official calendar.
• Comfort service for technical and everyday work problems.
• Opportunities for IT certifications and access to top-tier courses and learning platforms.
• Pleasant environment with corporate parties and team get-togethers.