Backend Engineer, AI (Agent Systems)

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ABOUT ACTAI

There are over 5 billion users using basic applications today such email, notes, tasks, calendar and they're not AI-native. Our mission is to build proactive applications for anyone in the world, who are not used to complex prompting. We aim to bring intelligence to conversations, errands, organising and workflows, with minimal to no prompting.

Our first application is an agent-first mobile communication app. We believe building applications that users use daily for communication, coordination and collaboration needs will help integrate AI into their lives. The net effect is to eliminate misinformation, achieve low coordination costs, enable high quality tasks and collaboration at scale with minimal or little prompting.

ROLE

As a Backend Engineer, AI, you own the inference and orchestration layer that powers every AI interaction in the product. Your work sits between models and users, where latency, correctness, reliability, and cost directly impact real-world experience.

You will build and operate production systems that turn model capability into fast, stable, observable APIs used across mobile and desktop clients.

FOCUS

• Build and operate backend systems that serve AI-powered features in production.

• Design inference pipelines, orchestration layers, and service boundaries around models.

• Own production concerns: monitoring, logging, alerting, and incident response.

• Optimize latency and throughput across inference, caching, batching, and streaming.

IDEAL EXPERIENCES

• Strong backend engineering fundamentals in production environments.

• Experience running high-throughput, low-latency services.

• Familiarity with AI inference patterns (LLMs, embeddings, multimodal).