Senior Software Engineer

HeyMilo AI; San Francisco (CA); On-site; USD 100,000 - 150,000; Full time

Job summary

An innovative AI technology firm located in San Francisco is seeking a talented full stack engineer to develop real-time AI interview systems. Candidates should have 3–5+ years of experience and be comfortable with technologies like ReactJS and MongoDB. This role demands a proactive individual ready to tackle complex challenges in a fast-paced environment, making it perfect for those seeking impactful work on cutting-edge AI solutions.

Qualifications

• 3–5+ years of professional software engineering experience.
• Experience shipping end-to-end products and operating systems in production.
• Basic understanding of machine learning fundamentals.

Responsibilities

• Building real-time AI interview systems with low latency.
• Designing and scaling infrastructure for concurrent interview sessions.
• Developing backend APIs and orchestrating workflows.

Skills

Full stack development

Systems thinking

Real-time communication

Low-latency pipelines

Tools

ReactJS

NextJS

MongoDB

ClickHouse

LiveKit

Job description

HeyMilo is a platform that helps recruiters deploy multimodal AI agents to interview and evaluate candidates at scale.

This role is for an exceptional full stack engineer who wants to work on frontier AI technology including real-time communication, low-latency pipelines, orchestration, and production infrastructure that supports interviews happening across the world.

If you want a very predictable roadmap and narrow responsibilities, this role is not for you.

If you want to build real-time AI systems that feel human, keep reading.

What you'll work on

• Building real-time AI interview systems (voice + video, low latency)
• Designing and scaling infrastructure for thousands of concurrent interview sessions
• Developing backend APIs and workflow orchestration (FastAPI, Temporal)
• Shipping full stack product features used by employers and candidates every day
• Building queue-driven systems for job execution, retries, and automation (SQS)
• Working on retrieval systems and prompt-driven agent workflows (VectorDBs, MCP)
• Improving reliability, performance, and observability across production systems
• Supporting enterprise integrations, data pipelines, and security patterns

What we're looking for

• Use Cursor/Devin to write a good chunk of your code.
• 3–5+ years of professional software engineering experience
• Full stack engineer who can ship end-to-end and operate systems in production
• Strong systems thinking and engineering fundamentals
• Basic understanding of prompt writing + ML fundamentals
• High ownership, high accountability, low ego
• Deep belief in what were building

Tech you should be comfortable with

• Frontend: ReactJS, NextJS, ShadCN
• Databases & analytics: MongoDB, ClickHouse, InfluxDB
• Retrieval: VectorDBs, RAG-style systems
• Real-time: LiveKit, Pipecat, low-latency audio/video pipelines

This role is not for you if

• You want a strict 9–5 job
• You prefer narrow scopes and fixed task lists
• You want safety over upside