Backend Engineer (Python)

HeyMilo is scaling intelligent hiring through AI interview agents that run reliably, in real time, at enterprise volume. We are seeking a mid to senior Backend Engineer to own and evolve the core API and backend services powering our platform.

This is a backend-first, product-critical role: you'll build scalable Python/FastAPI services, ship new features, and ensure production stability. You’ll work directly on our AI interviewer orchestration layer, including agent workflows, prompts, and debugging.

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What You'll Do

• Build, maintain, and scale Python/FastAPI services powering HeyMilo's core platform and AI interviewer
• Design and evolve clean, reliable API contracts for product surfaces and internal services
• Implement backend logic for interview execution, evaluation flows, and real-time decisions
• Own critical parts of the agentic AI orchestration layer: improve workflows, debug agent behavior, and ensure prompt/tool execution is stable at scale
• Diagnose and resolve complex production issues across services, async workflows, databases, and external boundaries
• Improve reliability and performance via strong observability: logging, metrics, tracing, dashboards, alerts, and incident follow-through
• Refactor and optimize existing systems to enhance maintainability, latency, and throughput
• Work end-to-end: build, ship, monitor, iterate

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Who You Are

• Backend specialist: strong Python skills with real production experience building APIs/services
• FastAPI experience: comfortable designing and implementing scalable endpoints
• MongoDB familiarity: experience with NoSQL/document data modeling
• Excellent debugger: enjoys untangling tricky issues across API boundaries and async workflows
• Reliability-minded: care about stability, observability, and performance
• Agentic AI/LLM curious or experienced: comfortable with prompts, agent orchestration, hallucination debugging, and tool-calling
• Startup-ready: high ownership, independent problem solver, thrive in a fast-paced environment

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Nice to Have

• Experience with async/background job patterns and queues (e.g., Temporal)
• Familiarity with Redis or caching/eventing patterns
• Experience with DevOps or infra automation in cloud environments
• Exposure to GCP, Docker, CI/CD pipelines, microservices

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Standard Requirements

• 3+ years of professional software engineering experience
• Bachelor’s degree in Computer Science, Software Engineering, or equivalent practical experience
• Based in Sri Lanka, open to working remote in a high-ownership, high-velocity team

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Why Join HeyMilo

• Own and scale the backend that powers a rapidly growing AI interview platform
• Work directly on agentic AI systems in production
• High agency, high impact: ship meaningful features quickly and see them used at scale
• Learn fast alongside a strong engineering team with global tech experience
• Competitive compensation, performance-driven rewards, and rapid growth opportunities