Founding Engineer

Millee; San Francisco (CA); On-site; USD 140,000 - 220,000; Full time

Job summary

Millee is the fastest-growing, AI-driven recruitment performance platform. As our Engineer, you will help build the infrastructure and APIs powering AI-driven insights for real-time decision making.

You will design a serverless, scalable architecture, process large datasets efficiently, and ensure high reliability from day one. Early‑stage equity is included for a founder‑level impact role in San Francisco.

Qualifications

• Must have shipped AI features to production and own architecture from day one.
• Strong full stack engineer who can translate real-world workflows into reliable software systems.
• Design and evolve a serverless, event-driven architecture processing data in real time.
• Experience building multi-step AI systems using orchestration frameworks.
• Understand routing tasks across model tiers for generation and classification.
• Build event ingestion pipelines for webhooks, transcripts, and CRM activity.
• Work with retrieval systems combining knowledge bases with context-aware AI.
• Design fault-tolerant systems with retries and durable queues.

Responsibilities

• Build and optimize the infrastructure powering AI-driven insights.
• Design scalable APIs and process large datasets efficiently.
• Ensure high-performance systems to empower recruiters with accurate data.
• Collaborate with product and data teams to improve AI decision layers.

Skills

Production experience

Systems builder

Architecture ownership

AI systems design

Model routing judgment

Data pipeline engineering

Retrieval systems

Reliability mindset

Scaling product intelligence

Job description

Millee is the fastest-growing, AI-driven recruitment performance platform in the world.

Built on 10,000 real won and lost recruitment processes, Millee’s data shows users what creates success or causes failure in their searches. We join that data with deep context about our customers to find the opportunities worth acting on, and then put agents to work: automating risk analysis, drafting responses, auditing deals for nuance, to run a superior search. It measures what works and gets better every day.

As our Engineer, an early-stage seat with founder level equity, you will build and optimize the infrastructure that powers our AI-driven insights. You will design scalable APIs, process large datasets efficiently, and ensure high-performance systems that help businesses take control of their AI recruitment performance.

Preferred Requirements:

• Production experience They must have shipped AI features to production and be comfortable owning architecture and core product reliability from day one.
• Systems builder They need to be a strong full stack engineer who can turn messy real world workflows into reliable software systems.
• Architecture ownership They will design and evolve a serverless, event driven architecture that processes recruiting activity data in real time.
• AI systems design They need experience building multi step AI systems using orchestration frameworks such as Mastra or similar agent frameworks.
• Model routing judgment They must understand how to route tasks across different model tiers, using large models for generation and smaller models for classification and structured reasoning.
• Data pipeline engineering They should be comfortable building event ingestion pipelines that process webhooks, transcripts, and CRM activity into structured signals.
• Retrieval systems They need experience working with retrieval systems that combine proprietary knowledge bases with context aware AI generation.
• Reliability mindset They must design systems with strong failure isolation, retry handling, and durable queues so individual failures never break the pipeline.
• Scaling product intelligence They will be responsible for improving and scaling the AI decision layer that assembles context, diagnoses recruiting situations, retrieves expertise, and generates recommended actions for users.

For the interview, watch this 2 min video, and come with 1 idea for our product roadmap: https://www.youtube.com/watch?v=CeqzTqOI0yk