Remote Kotlin / Java Backend Developer

Snaphunt; España; A distancia; EUR 40.000 - 60.000; Jornada completa

Descripción de la vacante

A technology firm in Spain is seeking a backend developer proficient in Kotlin and Java to design server-side logic and build data pipelines. The ideal candidate will have strong problem-solving skills, experience with Spring Webflux, and familiarity with AWS and PostgreSQL. This role offers excellent career development opportunities and collaboration with a talented team of developers.

Servicios

Excellent career development opportunities

Work alongside best-in-class talent

Formación

• Strong proficiency in Kotlin / Java.
• Experience with containerization technologies (Kubernetes, Docker).
• Proficiency with Spring Webflux and Reactive Streams.

Responsabilidades

• Design and implement server-side logic using Spring Webflux and Kotlin.
• Build robust, reliable data pipelines.
• Collaborate with front-end developers.

Conocimientos

Kotlin

Java

Problem-solving

Communication skills

Herramientas

Docker

Kubernetes

AWS

PostgreSQL

Descripción del empleo

The Offer

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

The Job

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

The 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.

The Employer

Our client has been working for nearly two decades in the real-time trading technologyand fintech space. Our client delivers complex technological systems that enable serious traders worldwide.