Jack & Jill/External ATS - Backend/Infrastructure Engineer at Mubit
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Requirements
• Proven experience building and running high-scale, latency-sensitive production systems using performance-oriented languages like Rust, Go, or C++. • Deep understanding of distributed systems, storage engine trade-offs, and serving data within a hot execution loop. • A self-directed builder who thrives in ambiguity and has extensive experience with LLM orchestration frameworks and agentic memory patterns. • Who are Jack & Jill? • Ok, I'll go first. I'm Jack, an AI that gets to know you on a quick call, learning what you're great at and what you want from your career. Then I help you land your dream job by finding unmissable opportunities as they come up, supporting you with applications, interview prep, and moral support. • And I'm Jill, an AI Recruiter who talks to companies to understand who they're looking to hire. Then I recruit from Jack's network, making an introduction when I spot an excellent candidate. • Step 1. Visit our website https://jackandjill.ai/jack/job-listing?utm_source=job_listing&utm_medium=job_board&utm_campaign=f3c229c3-722e-4f94-84fe-dcf01b40116d. • Step 2. Click 'Talk to Jack'. • Step 3. Talk to Jack so he can understand your experience and ambitions. • Step 4. Jack will make sure Jill (the AI agent working for the company) considers you for this role. • Step 5. If Jill thinks you're a great fit and her client wants to meet you, they will make the introduction. • Step 6. If not, Jack will find you excellent alternatives. All for free. • We never post fake jobs • This isn't a trick. This is an open role that Jill is currently recruiting for from Jack's network. • We appreciate this can make them look a bit suspect, but there isn't much we can do about it. • Give Jack a spin! You could land this role. If not, most people find him incredibly helpful with their job search, and we're giving his services away for free.
Responsibilities
• Design and implement the core storage and retrieval architecture to handle agent execution history at massive scale. • Build and maintain the SDK that developers use to integrate Mubit with frameworks like LangGraph, CrewAI, and AutoGen. • Profile and optimize system bottlenecks to ensure consistent performance under heavy load while scaling infrastructure 100x.
Benefits
• Founding engineer impact: As hire number one, you co-own the architecture and technical direction of a critical infrastructure layer for the AI era. • High-performance engineering: Tackle complex distributed systems challenges where sub-80ms latency is the baseline requirement for production agents. • On-site collaboration: Build alongside a well-funded founding team in a high-energy Canary Wharf office, fostering rapid iteration and deep technical ownership.
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