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Phonely (YC S24) · 9 hours ago

Senior Backend Engineer (Python)

San Francisco, CA

Full-time

Onsite

Senior Level

$150K/yr - $220K/yr

5+ years exp

Phonely is a fast-growing company focused on transforming voice AI interactions for businesses. The Senior Backend Engineer will be responsible for building and maintaining Python-based state systems, integrating multiple LLM providers, and ensuring high performance and reliability of the systems.

Artificial Intelligence (AI)Information and Communications Technology (ICT)Software

Responsibilities

Build and maintain Python-based state systems that drive what the voice AI says and does across complex, real-time conversations

Integrate and orchestrate multiple LLM providers, including prompt design, tool/function calling, routing, and fallbacks

Write clean, maintainable, high-performance Python code, leveraging asyncio, OOP, and best practices

Write automated tests and validation suites to ensure correctness, resilience, and safe iteration of agent logic and state transitions

Monitor production systems, debug agent behavior, and continuously improve reliability and conversation quality

Implement comprehensive metrics, logging, and alerting to validate correctness, detect failures early, and maintain extremely high availability

Desgin database schemas, optimize queries, and operate both SQL and NoSQL databases in production

Build and operate authentication and authorization mechanisms with strong security guarantees

Design and build microservices-based architectures

Qualification

PythonAsync programmingAWSKubernetesMicroservicesAPIsTesting frameworksSecurity practicesCI/CDCommunication skills

Required

5+ years writing python, experience writing async web apps using fast api, testing frameworks

Understanding of LLMs, APIs, Cloud, CI/CD pipelines

Comfortable with understanding technical specifications

Understanding of good architecture, security practices

Strong technical and communication skills

Experience with AWS & Kubernetes

Benefits

The company pays for food

We rent out Airbnb’s in cool places (Rocky mountains, Costa Rica, Indonesia) four times a year

Company

Phonely (YC S24)

🌍 On a mission to create the world's most advanced AI phone service 🤖 Experience AI agents that sound and act just like people 📊 Gain insights with our detailed analytics dashboard 🔗 Effortlessly integrate with Zapier, Google Calendar, and more 🌐 www.phonely.ai 📞 Give our AI a call: +1 (844) 734-4902

Founded in 2023

San Francisco, California, USA

2-10 employees