Senior Backend Engineer, Precision Defense

The role

You will build and maintain backend APIs, ETL pipelines, and data processing systems for the Precision Defense team. You will design GraphQL APIs and develop event-driven services to support security automation workflows.

What you will do

• Build and maintain backend APIs, ETL pipelines, and data processing systems
• Design and implement GraphQL APIs
• Develop event-driven services and distributed systems
• Collaborate with frontend engineers, attack engineers, and product managers
• Contribute to production reliability through monitoring, alerting, and incident response
• Support safe, explainable, and reversible security automation

Required qualifications

• Bachelor's Degree in Computer Science, Computer Engineering, or related field
• 7+ years of professional software engineering experience using modern object-oriented or functional languages (Python, Java, Go, Scala, C++, TypeScript, etc.)
• Experience building applications on cloud computing platforms such as AWS, Azure, or GCP
• Experience using container technologies such as Docker and Kubernetes
• Expert proficiency in SQL
• Ability to own and manage concurrent initiatives
• Driven, self-managed, capable of conceiving and implementing solutions
• Strong technical documentation ability
• Effective communication and collaboration with designers, developers, and product managers
• Ability and interest in mentoring junior and mid-level engineers

Nice to have

• Experience in EDR/endpoint telemetry and control validation
• Experience in detection engineering and SOC/SIEM workflows
• Experience in threat detection, deception systems, honeypots, or tripwire-style platforms
• Experience in vulnerability intelligence and rapid response workflows
• Familiarity with major EDR platforms (CrowdStrike, SentinelOne, Microsoft Defender)
• Understands detection logic, alert triage workflows, and how security teams consume findings
• Comfort translating attack behavior into measurable defensive outcomes
• Experience with relational (PostgreSQL) and graph (Neo4j) database architectures
• Experience building GraphQL backends
• Background in event-driven systems, distributed services, observability, and production reliability

Benefits

• Equity package in the form of stock options
• Health, vision & dental insurance for you and your family
• Flexible vacation policy
• Generous parental leave

About the company

Horizon3 is a fast-growing, remote cybersecurity company dedicated to enabling organizations to proactively find and fix exploitable attack vectors. The team is a fusion of former U.S. Special Operations cyber operators, startup engineers, and formerly frustrated cybersecurity practitioners.