Senior Backend Engineer (Python)

Phonely
San Francisco
Workplace: OnsiteFull timeUSD 150,000 - 220,000 annuallyFunction: Software EngineeringExperience: 5+ yearsSkills: ["Communication","Teamwork","Problem-solving","Attention to detail","Fast learner"]

Senior Backend Engineer at Phonely will design and implement Python-based state machines for voice AI, integrate multiple LLM providers, and build scalable microservices. You’ll write high-performance, asynchronous Python code, design secure auth systems, and own testing, monitoring, and deployment. You’ll collaborate with engineers, support, and product teams in a fast-paced, on-site SFOffice role focused on reliability and impact.

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FursaFursa
Phonely
Phonely
7 months ago

Senior Backend Engineer (Python)

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Source: Company careers pageValidated by: Fursa AI
Last checked: 15 hours agoStatus: Live

Job Summary

Senior Backend Engineer at Phonely will design and implement Python-based state machines for voice AI, integrate multiple LLM providers, and build scalable microservices. You’ll write high-performance, asynchronous Python code, design secure auth systems, and own testing, monitoring, and deployment. You’ll collaborate with engineers, support, and product teams in a fast-paced, on-site SFOffice role focused on reliability and impact.
Location: San Francisco
Workplace: Onsite
Employment Type: Full time
Job Function: Software Engineering
Seniority: Sr. Manager level

Key Responsibilities

  • •Build and maintain Python-based state systems that drive the voice AI across real-time conversations.
  • •Integrate and orchestrate multiple LLM providers, including prompt design, tool/function calling, routing, and fallbacks.
  • •Write clean, high-performance Python code leveraging asyncio and OOP.
  • •Write automated tests and validation suites to ensure correctness, resilience, and safe iteration of agent logic and state transitions.
  • •Design and build microservices-based architectures with authentication/authorization mechanisms to ensure security and reliability.

Pay and Benefits

Salary: USD 150,000 - 220,000 annually
Equity and Bonus:Equity

Key Requirements

  • •5+ years writing Python, experience writing async web apps using FastAPI, testing frameworks
  • •Understanding of LLMs, APIs, Cloud, CI/CD pipelines
  • •Experience with AWS & Kubernetes
  • •Strong technical and communication skills
  • •Understanding of good architecture, security practices
Experience:5+ yearsAIVoice AILLM
Skills:CommunicationTeamworkProblem-solvingAttention to detailFast learner
Tech Stack:PythonAsyncioFastAPIAWSKubernetesRedisFirebaseSupabaseNext.jsDatadogSIPLLMAPIs

Eligibility

Work Authorization:Authorization required. Sponsorship not provided.

Company Brief

Phonely
Develops AI-driven voice agents that automate phone conversations for businesses, handling customer support, lead qualification, and sales outreach. Their platform uses natural language understanding and speech synthesis to conduct human-like calls and integrate with CRM systems.
Industry: AI & Machine Learning
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