Senior Software Engineer (Python/ JavaScript/ AWS/ LLMS)

D24 Search is a VC backed start up that builds AI-enabled data infrastructure for secure data access and intelligence sharing, specifically for U.S. intelligence and defense communities. They are seeking a Senior Software Engineer to make technical direction and architectural decisions for their platform, requiring a mix of software development and ML Ops practices.

Responsibilities:

• Making technical direction and architectural decisions for the platform
• Building, shipping, and supporting mission-critical services across the full data stack
• Leveraging LLMs and AI tooling as a core part of software design, build, ship, and debug processes

Requirements:

• 12–20+ years of experience with meaningful time at Staff level or above
• Proficiency with AWS (S3, Lambda, RDS), securing large-scale production data, and ML development in Python/JS
• Track record owning architecture for mission-critical, large-scale production systems
• You think in systems and trade-offs, communicate clearly to technical and non-technical stakeholders, and thrive in ambiguity with high ownership
• Experience shaping engineering culture within government (DoD, Intel) organizations
• You are comfortable with ambiguity and high ownership
• You have experience handling and securing large-scale production data
• You are excited by how AI enables and demands better solutions to time-old problems like data sharing
• You use AI coding tools (Claude Code, Cursor, Copilot) daily and instinctively
• Familiarity with MCP or similar LLM integration frameworks
• You have a clear-eyed view of AI limitations, you know when to trust AI-generated output and when to verify