Backend Engineer, Data Platform & APIs

About the Role

Join Halcyon's cloud team as a Backend Engineer to contribute to our world-class anti-ransomware platform, focusing on the development and evolution of our data platform and API services using a modern tech stack.

Responsibilities

• Contribute to feature development across our data platform and public API services, including ingestion, transformation, and enrichment of security data.
• Collaborate with product and platform engineers to align on system design, architecture, and data flow.
• Develop, test, deploy, and monitor Scala-based backend services that are reliable, secure, and performant.
• Support our gradual migration of certain APIs from Scala to C#, ensuring consistency and continuity.
• Maintain high standards for code quality, documentation, and operational reliability.
• Participate in design discussions, code reviews, and incident response.
• Support and enhance our Python-based security analysis platform, including malware analysis engines, automated threat detection, and machine learning model workflows.

Requirements

• 5+ years of backend engineering experience, with recent experience in a JVM-based codebase.
• Exposure to C# or interest in learning it as part of a migration path.
• Strong understanding of APIs, messaging systems (Kafka), and modern data stores (Postgres, DynamoDB, OpenSearch).
• Experience building services in a cloud-native environment, preferably AWS.
• Working knowledge of containers and Kubernetes.
• Comfortable working in a remote-first, asynchronous team environment.

Nice-to-Haves

• Familiarity with functional programming patterns and idiomatic Scala.
• Experience with Terraform, Helm, and GitHub Actions.
• Familiarity with observability tools (Prometheus, Grafana, CloudWatch).
• Prior work in security products, data pipelines, or high-availability systems.
• Python development experience, particularly with security analysis tools and malware detection frameworks (YARA, PE analysis, binary analysis).
• Familiarity with machine learning workflows, AutoML, and MLflow for model deployment and management.
• Experience with binary analysis libraries (LIEF, ssdeep, TLSH) and security tooling integration.

About Halcyon

Halcyon is the industry’s first dedicated, adaptive security platform that combines multiple proprietary advanced prevention engines along with AI models focused specifically on stopping ransomware. We are a remote-native, completely distributed global team formed by cyber industry veterans.