Senior Full-Stack Developer - Scanz

Location:

Remote Type:

Contractor

About Scanz Scanz has been building real-time trading technology for nearly two decades, powering serious traders around the world. We specialize in complex, high-performance systems that operate at scale in the fintech and capital markets space.

At Scanz, innovation is grounded in education, curiosity, and collaboration. We foster a culture of continuous self-improvement and actively encourage out-of-the-box thinking. Our distributed teams work closely together to build the next generation of financial software used by traders of all experience levels—from industry professionals to first-time investors.

The Role We’re looking for a

Senior Backend Developer

to join our engineering team and help design, build, and scale robust server-side systems and data pipelines. You’ll work primarily with

Kotlin and Spring WebFlux

in a highly concurrent, event-driven environment processing millions of operations per day.

Strong Kotlin experience is preferred, but we’re equally open to seasoned Java developers who are motivated and able to transition quickly to Kotlin.

This is a core role with real ownership: you’ll help shape architecture decisions, performance strategy, and system reliability in a production-grade fintech platform.

What You’ll Do

Design and implement server-side services using

Kotlin, Java, and Spring WebFlux

Build and maintain

fault-tolerant, high-throughput data pipelines

Develop and maintain

high-performance APIs

Collaborate closely with frontend engineers to integrate user-facing features

Contribute to

PostgreSQL

schema design and optimization

Improve system throughput and reliability through

profiling, tuning, and performance testing

Scale services horizontally in a cloud-native environment

Integrate performance and reliability checks into CI pipelines

Participate in weekly standups, code reviews, and architectural discussions

What We’re Looking For

Strong proficiency in

Kotlin and/or Java

Solid experience with

Kotlin coroutines and flows

Deep understanding of

Spring WebFlux , Reactive Streams, and backpressure

Experience building

distributed, fault-tolerant systems

Strong problem-solving and analytical skills

Comfortable working asynchronously across time zones

Excellent communication skills (Slack, Loom, async collaboration)

Hands-on experience with:

PostgreSQL

AWS

and cloud-native architectures

Docker and Kubernetes

Strong grasp of the

testing pyramid

(unit, integration, E2E)

Willingness to actively participate in code reviews and technical discussions

Backend Tech Stack

Kotlin, Java

Spring WebFlux, Ktor Server

Kotlin Coroutines

RSocket

Ktor Client

kotlinx.serialization

Quartz

Kotest, JUnit

Gradle

Frontend Tech Stack

Kotlin Multiplatform

React (Hooks)

TypeScript

SharedWorker

NPM

Gradle

Infrastructure & Tooling

AWS (including S3)

Docker & Kubernetes

Prometheus & Grafana

Jenkins

GitHub

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