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Senior Full-Stack Developer - Scanz at G2i Inc.. Remote Location: Remote. 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