Software Engineer - Agent Orchestration

Sela; San Francisco (CA); Hybrid; USD 140,000 - 190,000; Full time

Benefits offered by this job

Top-of-market health coverage

401(k) with employer match

Unlimited PTO

Hybrid in-office SF schedule

Job summary

Sela in San Francisco is hiring a software engineer to build production-grade LLM applications and in-house agent orchestration.

You will optimize context handling, state, and workflows across conversations, channels, and human touchpoints, with a focus on performance, reliability, and privacy.

Join a fast-growing startup backed by top investors, with a hybrid in-office schedule four days a week in SF and a remote day on Wednesdays.

Qualifications

• 3–6 years of software engineering experience.
• Experience building production LLM applications, agent systems, workflow engines, or other complex backend systems.
• Strong Python skills and understanding of software design patterns.
• Experience with agent frameworks such as LangGraph, OpenAI Agents SDK, or similar.
• Strong understanding of asynchronous systems, state management, tool execution, and distributed workflows.

Responsibilities

• Own major components of Sela’s in-house agent orchestration framework, from architecture and implementation to reliability in production.
• Improve how agents manage context, state, tools, reasoning, and handoffs during real-time conversations.
• Extend agents to complete longer-horizon workflows across multiple conversations, channels, and human touchpoints.
• Build systems that let specialized agents coordinate and safely share context across parallel sessions.
• Add new modalities such as video while creating a consistent agent experience across every channel.
• Improve the evaluation, observability, reliability, and safety of agents handling hundreds of thousands of conversations per day.

Skills

Python

LLM applications

Agent systems

Distributed workflows

Asynchronous systems

Tools

LangGraph

OpenAI Agents SDK

Job description

About Sela

Sela is the market-leading AI voice agent for mortgage lenders. Founded in 2024, we’ve grown like crazy (~$0->13M in 20 months), and currently count 5 of the 10 largest independent mortgage banks in the U.S. as enterprise customers. If we’re successful, the cost of owning a home in the US will become ~1% cheaper. We’ve raised $21M across our Seed and Series A from top investors.

About Sela

Sela is the market-leading AI voice agent for mortgage lenders. Founded in 2024, we’ve grown like crazy (~$0->13M in 20 months), and currently count 5 of the 10 largest independent mortgage banks in the U.S. as enterprise customers. If we’re successful, the cost of owning a home in the US will become ~1% cheaper. We’ve raised $21M across our Seed and Series A from top investors.

Why this is a huge opportunity

Around 1% of the U.S. labor force works in phone sales, representing roughly $100B of annual salary, and the industry is poised at the brink of complete disruption. We are at the cutting edge of this economic transformation, one of the first companies creating real, durable economic value through applied AI.

Buying a house is the largest financial decision most people make in their lives, and homeownership is tied to many other purchases, including life insurance, homeowners insurance, alarm systems, home renovations, solar panels, and more. By owning the mortgage vertical, we will own the relationship with the consumer, allowing us to serve as the essential AI infrastructure for high consideration consumer sales.

Why Join

• Crazy growth: The market pull is exhilarating - we’ve grown 10x in the past 12 months and more than 100x since our seed round, all without a dedicated sales or marketing team. Building something that people want so badly is the best feeling you can have in a startup.
• Team and Culture: We are a high-agency team where the bar is high and everyone makes the people around them better. Collaboration and intensity are core team values: people truly care about their work and their coworkers. At the same time, we don't take ourselves too seriously.
• Challenging problems: Outperforming human sales teams on half a million daily calls is not easy. Low-latency, real-time infra. 99.9% uptime. Enterprise-grade privacy and security. Advanced simulation and evaluation systems. Flexible A/B testing. AI scheduler and dialer. We own the whole stack and we do not compromise on quality.
• Well-funded: We’ve raised $21M+ in total funding, most recently a $15M Series A in June 2026.

What Will You Do

• Own major components of Sela’s in-house agent orchestration framework, from architecture and implementation to reliability in production
• Improve how agents manage context, state, tools, reasoning, and handoffs during real-time conversations
• Extend agents to complete longer-horizon workflows across multiple conversations, channels, and human touchpoints
• Build systems that let specialized agents coordinate and safely share context across parallel sessions
• Add new modalities such as video while creating a consistent agent experience across every channel
• Improve the evaluation, observability, reliability, and safety of agents handling hundreds of thousands of conversations per day

What Are We Looking For

• 3–6 years of software engineering experience
• Experience building production LLM applications, agent systems, workflow engines, or other complex backend systems
• Strong Python skills and a deep understanding of software design patterns and best practices
• Experience with agent frameworks such as LangGraph, OpenAI Agents SDK, or similar
• Strong understanding of asynchronous systems, state management, tool execution, and distributed workflows
• Experience using AI coding tools or agents to ship maintainable, clean code
• Experience in high-growth startups, ideally at Seed through Series B

Benefits

• Top-of-market medical, dental, and vision coverage for you and your dependents
• 401(k) with a top-of-market employer match
• Unlimited PTO
• Snacks, weekly team lunches, and dinner on Sela
• Hybrid in-office schedule: four days a week together in SF, with a flexible remote day on Wednesdays