Senior Backend Cloud Engineer

The role

You will lead the development and evolution of the data platform and API services. You will work with a tech stack blending Scala and Rust to build scalable backend systems.

What you will do

• Lead the design and delivery of features across the data platform and public API services.
• Drive system design, architecture, and data flow decisions.
• Build, deploy, and own Scala-based backend services in production.
• Help shape and execute the migration of selected APIs from Scala to Rust.
• Set the bar for code quality, documentation, and operational excellence.
• Lead design reviews and code reviews.
• Take part in on-call and incident response.
• Support and enhance the Python-based security analysis platform.

Required qualifications

• 5+ years of backend engineering experience
• Recent experience in a JVM-based codebase
• Track record of designing and owning distributed systems from start to finish
• Experience with Rust, or a well-formed view of when it is the right tool
• 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 have

• Familiarity with functional programming patterns and idiomatic Scala
• Experience with Databricks and ClickHouse (or similar lakehouse and analytical/OLAP data stores)
• Experience with Terraform, Helm, and GitHub Actions
• Familiarity with observability tools (Prometheus, Grafana, CloudWatch)
• Prior work on 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

Benefits

• Comprehensive healthcare (medical, dental, and vision) with premiums paid in full for employees and dependents
• 401k plan with a generous employer contribution
• Short and long-term disability coverage
• Basic life and AD&D insurance plans
• Medical and dependent care FSA options
• Flexible PTO policy
• Parental leave
• Generous equity offering

About the company

Halcyon is a remote-native, completely distributed global team building an adaptive security platform focused on stopping ransomware. The company was formed in 2021 by a team of cyber industry veterans.