[Remote] Backend Software Engineer — Agentic AI Platform

Note: The job is a remote job and is open to candidates in USA. Flexhire is a stealth-mode startup building an operating system for the next generation of computing, where AI agents replace traditional applications. The Backend Software Engineer will build foundational backend infrastructure for its Agentic OS, including agent runtime, memory and context systems, LLM routing, real-time communication, privacy architecture, and mobile-to-wearables infrastructure.

Responsibilities

• You'll build the backend infrastructure that powers our Agentic OS — the agent runtime, the memory and context layer, the LLM routing system, and the privacy architecture that makes all of it trustworthy. You'll work directly with the CEO and a small, high-trust engineering team across Silicon Valley, Paris
• Agent runtime and orchestration infrastructure — session management, intent routing, tool execution
• Persistent memory and context layer — encrypted, anonymized, and privacy-compliant from day one
• LLM routing and multi-provider integration — LLM agnostic by design, supporting regional models globally
• Real-time communication systems — low-latency APIs supporting always-on contextual awareness
• Privacy and security architecture — E2E encryption built in, not bolted on
• Mobile-to-wearables infrastructure — designed to minimize cloud dependency and support edge computing as the platform evolves to hardware

Skills

• 5+ years of backend engineering experience, ideally in consumer AI, real-time systems, or platform infrastructure
• Strong Python — FastAPI, async patterns, production-grade API design
• Real-time communication experience — WebSockets, SSE, gRPC, or similar
• PostgreSQL or comparable relational database experience at scale
• Strong familiarity with security and encryption protocols and standards
• Cloud deployment experience on GCP or AWS with Kubernetes
• Active user of AI-assisted development tools with a genuine point of view on how to use them well
• Strong written English and proven remote collaboration skills
• LLM integration experience
• E2E encryption or privacy-preserving architecture
• Edge computing awareness
• Terraform
• Helm
• ArgoCD

Benefits

• Meaningful early-stage equity
• Full medical, dental, and vision coverage
• Fully remote with occasional in-person time in Silicon Valley or Paris for key milestones

Company Overview

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