Senior Software Engineer - Platform

D24 Search is a VC backed startup building the runtime control layer for AI agents in the cybersecurity domain. They are seeking a Senior Software Engineer to be the first key engineering hire, responsible for building backend services and shaping the platform from scratch.

Responsibilities:

• Build backend services for agent connections, tool access, execution records, and control workflows using Go, Java, or Rust
• Take ownership of production paths where authentication, state, latency, and failure handling matter — including on-prem/hybrid deployments (control plane on our side, data plane on customer side)
• Design APIs and data models that make agent activity reliable and understandable as the product scales
• Work closely with the CTO and founding team to shape product direction and turn ambiguous problems into working software
• Set a high engineering bar through code review, technical mentorship, and clear implementation choices
• Help build out the engineering team over time — this is the first targeted platform hire, with IC engineers to follow

Requirements:

• 5+ years of experience in backend/infrastructure engineering at B2B or security companies
• Experience at a cybersecurity, networking infrastructure, or API gateway company (e. g. Okta, Ngrok, Zscaler, F5, Confluent, Elastic)
• Built/operated distributed backend services on cloud (AWS/GCP/Azure) or hybrid/on-prem deployments — control plane vs. data plane thinking, running clusters, cloud primitives
• B2B enterprise product experience — has shipped platform software for regulated industries (defense, banking, insurance); consumer-facing or hardware backgrounds are a no-go
• Startup experience (seed–Series C) — has thrived in 0→1 / 1→2 environments
• On-prem or hybrid deployment experience (control plane / data plane)
• Computer Science degree required
• Proficient in Go, Java, or Rust (not just Python)
• Distributed systems (clusters, distributed networking/compute)
• Cloud platforms (AWS, GCP, or Azure)
• Concurrency primitives
• Identity/auth/gateway systems or MCP familiarity
• Strong in Go (preferred), Java, or Rust with deep understanding of concurrency primitives and distributed systems
• Career trajectory that includes some big tech (up to SD2/3) followed by transition to Series A-C startups
• Product-minded engineer who can structure work, drive features end-to-end, and eventually help build a team