Phonely
Phonely builds AI voice agents that automate phone calls for businesses. We’re a YC S24 company that raised our Series A in January and are looking for a senior full stack engineer to help build the future of voice AI.
Our stack includes TypeScript, Next.js, Vercel, Python, PostgreSQL, Kubernetes, AWS, Redis, and modern AI models.
We’re looking for engineers who enjoy owning features end-to-end, shipping quickly, and solving hard product and infrastructure problems in a small, high-performing team.
Experience with AI, voice, or distributed systems is a plus, but not required.
Reach out with your CV to [email protected] with “HN Hiring” as the subject.
We’re building the future of voice AI for businesses, with a platform designed to make real-time agents easy to build, tune, and operate.
We’re looking for a senior backend engineer to work on core systems that drive live voice conversations in production. This is a hands-on role with a lot of ownership and a lot of Python.
What you’ll do
• Build Python-based state systems for real-time voice AI conversations
• Integrate multiple LLM providers (prompting, routing, tool calling, fallbacks)
• Write high-performance async Python (FastAPI, asyncio)
• Design and test resilient agent logic and microservices
• Operate and improve production systems with strong observability
What we’re looking for • 5+ years of Python experience, including async web services
• Experience with FastAPI, testing, and CI/CD
• Strong system design and security fundamentals
• Familiarity with LLMs, cloud infrastructure, AWS, and Kubernetes
Stack
Python, FastAPI, async microservices, AWS/GCP, Kubernetes, Redis, Firebase, Supabase, Datadog, SIP/voice APIs
Why Phonely
Small, intense team of builders. High ownership, fast pace, real impact. In-office 5 days/week in SF. Company-paid meals, great culture and periodic international work trips.
https://www.ycombinator.com/companies/phonely/jobs/gp1xSAu-s...