Lead Software Engineer

HeyMilo AI; Toronto; On-site; CAD 130,000 - 150,000; Full time

Job summary

Join HeyMilo AI as a Senior/Lead Software Engineer, working on innovative AI-powered hiring technologies in a fast-paced environment. You'll build scalable APIs and manage critical backend infrastructure while influencing enterprise-level technology. Ideal for adaptable engineers ready to take ownership of their work in a dynamic startup culture.

Benefits

Competitive salary

Performance-based benefits

High ownership culture

Qualifications

• 3-5 years of experience in Software Engineering.
• Prior experience with startups, shipping 0->1 products.
• Familiar with AI services and observability.

Responsibilities

• Build scalable APIs and manage data infrastructure.
• Implement monitoring tools and handle large data volumes.
• Optimize database queries for real-time use.

Skills

Python

FastAPI

AWS

Docker

microservices

Redis

data processing

Education

Bachelor’s degree in Computer Science or equivalent

Tools

MongoDB

ClickHouse

Docker/Kubernetes

InfluxDB

PostHog

Job description

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HeyMilo scales intelligent hiring through AI agents handling interviews and evaluations reliably and quickly.

2025 has been a year of unprecedented demand for our platform and we're growing fast! We're looking for a Senior/Lead Software Engineer to work on our core platform services which powers real-time decisions, audio/video infrastructure, AI logic, and robust observability.

Who You Are

• Backend Specialist: Build scalable endpoints and services in Python and FastAPI.
• Infra Savvy: Experienced with AWS, Docker, Lambdas, and microservices.
• AI Curious: Familiarity with LLMs, prompt engineering, AI workflows.
• Data Processing Pro: Proficient with Redis, queues, and asynchronous jobs that process large volumes of data.
• Observability-Minded: Prioritize metrics, logging, and alerts.
• Startup Ready: Hands-on, adaptable, thrives in rapid-growth environments.

What You'll Do

• Develop scalable APIs using FastAPI, integrating AI services.
• Optimizing performance of MongoDB and ClickHouse queries for real-time usage.
• Build LLM evaluation pipelines and inference engines.
• Manage data infrastructure with ClickHouse, Redis, MongoDB.
• Implement monitoring and observability tools (InfluxDB, PostHog).
• Automate deployment and infrastructure with Docker/Kubernetes.
• Enhance job queue architecture with Airflow and async workers.

Some work that was shipped by our talented engineers recently:

• Detecting if a candidate is lying or cheating during interviews.
• Reducing analysis time from 5 minutes to 20 seconds post-interview.
• Leverage message queues to scale Agentic AI platform to support 1000+ concurrent interviews.
• AI/LLM: OpenAI, Anthropic, Gemini, Pinecone, DeepSeek, LLaMa Cloud

Why You Should Join Us:

• Own and scale critical backend infrastructure.
• Influence Agentic AI technology at enterprise scale.
• Work alongside top talent from Instagram, Microsoft, Uber, Meta.
• Competitive salary, strong performance-based benefits.
• Work hard, play hard culture with high ownership.
• Most importantly, be at the forefront of cutting agentic AI technology and take your career to new heights.

This Role is NOT for You If:

• You don’t have experience with FastAPI, Python, or MongoDB.
• If you're looking for a "chill" place to work. We ideate on Monday and ship by Friday. It's a fun, fast-paced environment where you will learn a lot, quickly.
• If you can’t work autonomously or take full accountability/ownership of your output. This role expects you to deliver quality work end to end, from writing the code to monitoring it in production.

Standard Requirements:

• 3-5 years of experience in Software Engineering
• Experience working at an early stage startup and shipping 0->1 products
• Bachelor’s degree or strong CS/engineering fundamentals from a reputable university in North America.

Seniority level

• Seniority level

  Mid-Senior level

Employment type

• Employment type

  Full-time

Job function

• Job function

  Engineering and Information Technology

• Industries

  Software Development

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