About the job
Amazon Leo is a constellation of Low Earth Orbit satellites that will provide low-latency, high-speed broadband network connectivity to unserved and underserved communities around the world.
We are looking for a senior software development engineer to be a founding engineer on the Engineering and R&D team within Leo Infrastructure and IP Security. The team defends the manufacturing lines, launch sites, and global ground infrastructure behind the constellation from the most sophisticated threat actors on the planet. You will build a neuro-symbolic reasoning platform: large language model agents combined with a knowledge graph and real-time asset state store that ground every conclusion in verifiable fact, so every automated decision is auditable. The platform automates incident response, threat analysis, offensive security testing, and detection authoring, backed by a high-throughput streaming pipeline that takes a detection from concept to production in hours. This is a unique opportunity to build a security platform from early stage through global scale, at a consequence level few teams ever encounter.
Responsibilities
You will own architecture decisions across the platform, providing system-wide design guidance and ensuring our services are secure, scalable, and operationally simple.
You will design and build the distributed systems that carry the platform, from telemetry ingestion and real-time correlation through agent execution and observability, in an environment where a wrong automated action has real operational consequences.
You will drive automation relentlessly: replacing manual security operations with software, building the evaluation and backtesting infrastructure that proves a model or detection is correct before it is trusted in production, and creating deployment guardrails that prevent human error in high-consequence environments.
You will partner with applied scientists to turn research prototypes into production capabilities, mentor engineers, lead design reviews, and set the standard for code quality across the team.
You will operate what you build, owning operational health, incident response, and reliability for services the security organization depends on.
Qualifications
Minimum
5+ years of non-internship professional software development experience
5+ years of programming with at least one software programming language experience
5+ years of leading design or architecture (design patterns, reliability and scaling) of new and existing systems experience
Experience as a mentor, tech lead or leading an engineering team
3+ years of experience as a mentor, tech lead or leading an engineering team
Experience with performance optimization, including memory management, multi-threading, SIMD, cache coherence, and lock-free or zero-copy designs
Experience designing and building distributed systems, including consensus, message passing, fault tolerance, and real-time stream processing at terabyte scale
Preferred
5+ years of full software development life cycle, including coding standards, code reviews, source control management, build processes, testing, and operations experience
Bachelor's degree in computer science or equivalent
Experience building and operating systems that integrate with LLM APIs or agent frameworks, including tool-use orchestration, prompt management, and execution monitoring
Experience with graph databases, knowledge graph platforms, or large-scale data modeling (Neptune, Neo4j, or equivalent)
Experience building multi-agent orchestration systems with dependency management, parallel execution, and failure handling
Experience designing observability and instrumentation systems for production ML or AI workloads
Experience with any combination of the following: threat modeling, secure coding, identity management and authentication, cryptography, or network security