Remote Kotlin / Java Backend Developer

The Role

We are seeking an expert-level Backend Developer to join our dynamic team and contribute to the development of robust, scalable server-side applications and data pipelines. You will primarily work with Spring Webflux and Kotlin (and Java). Although existing expertise in Kotlin is preferred, a deep understanding of Java is acceptable if there’s a willingness to adapt and transition quickly.

Scanz is a leading SaaS Trader Terminal that provides a suite of real-time trading tools to help traders and investors identify live trading opportunities in the US stock market. We are dedicated to offering our users – from trading pros to absolute beginners – an intuitive and efficient trading experience.

Responsibilities

• Design and implement server-side logic using Spring Webflux and Kotlin.
• Build robust, reliable, fault-tolerant data pipelines that process millions of operations daily.
• Collaborate with front-end developers to integrate user-facing elements with server-side logic.
• Develop and maintain APIs, ensuring high performance and responsiveness.
• Contribute to database design and implementation (PostgreSQL).
• Improve the system’s throughput and incorporate performance testing into our CI pipelines.
• Scale services horizontally.
• Contribute to weekly standup.
  
  

Back End Tech Stack

• Kotlin
• Spring Webflux
• Ktor Server
• Kotlin Coroutines
• RSocket
• Ktor Client
• Kotlinx Serialization
• Quartz
• Kotest + JUnit
• Gradle
  
  

Front End Tech Stack

• Kotlin Multiplatform
• React (with hooks)
• SharedWorker
• TypeScript
• NPM
• Gradle
  
  

Infrastructure

• AWS + S3
• Prometheus
• Grafana
• Jenkins
• Github
  
  

Ideal Profile

• Strong proficiency in Kotlin / Java.
• Proficiency with Kotlin coroutines (flows).
• Proficiency with Spring Webflux and Reactive Streams back pressure.
• Self-motivated developer comfortable working as a core member on an A-list team of backend and frontend developers split over different time zones.
• Strong problem-solving and analytical skills.
• Excellent collaboration and communication skills within an asynchronous environment (Slack, Loom).
• Deep-level understanding of distributed systems and how to make fault-tolerant applications.
• Experience with containerization technologies (Kubernetes, Docker).
• Strong familiarity with database systems, particularly PostgreSQL.
• Comfortable using AWS and cloud computing platforms.
• Solid understanding of the testing pyramid, specifically unit, integration, and E2E tests.
• Readiness and desire to participate in code reviews.
• Familiar with AI tools like Claude Code.
  
  

What's on Offer?

• Work within a company with a solid track record of success
• Work alongside & learn from best in class talent
• Excellent career development opportunities