Software Engineer, Agent Experience

AssemblyAI, Inc.; Los Angeles (CA); On-site; USD 160,000 - 210,000; Full time

Job summary

AssemblyAI, Inc. in Los Angeles, CA seeks a software engineer to own the agent experience for developer-facing products. You will design and ship coding agents, prompts, and integrations, collaborating with senior engineers to scale the AX domain.

You will measure success with evals, optimize prompts and docs, and help scale the playbook across products while leveraging AI tools to accelerate development.

Qualifications

• 2+ years of professional software engineering experience with JS/Python.
• Hands-on use of coding agents such as Claude Code, Cursor or Codex.
• Experience writing prompts, skills, tool definitions, or agent instructions.
• Product sense for developer-facing work and strong technical writing.

Responsibilities

• Drive the agent experience as a first-class developer user.
• Build and maintain agent skills for core products (Speech-to-Text, Real-time, Dictation, Voice Agents, TTS).
• Extend MCP server, ship agent and MCP auth (OAuth and API keys).
• Create llms.txt, docs, quickstarts and SDK examples for agent use.
• Tune prompts and instructions powering in-dashboard agent onboarding.

Skills

Full-stack JS/Python

Coding agents

Prompts & tooling

Technical writing

Tools

MCP server

OAuth & API keys

Job description

AssemblyAI builds the best-in-class Voice AI models powering the next generation of voice applications. Our models serve 600M+ inference calls monthly, process 1M+ hours of audio daily, and power 2 billion+ end-user experiences. The Voice AI space is at an inflection point; we’re looking for folks truly excited to join a small team and help define the future of the industry.

We are one of the most capital-efficient AI companies on the planet - with under 100 people generating roughly $600K ARR per employee, we sit among the top 5 most revenue-dense teams within the fastest-growing AI companies today. That's not an accident; it's a deliberate choice to stay lean, move fast, and give every person on the team outsized ownership and impact. With thousands of customers including Granola, Fireflies, Figure AI, and CallRail, the company has real scale - processing over 2 million hours of audio daily and handling more than 1 million API calls every day. This is a rare growth-stage opportunity where the business is proven and the trajectory is steep, but the team is still small enough that your fingerprints are on everything.

We’re committed to creating a space where our employees can bring their full selves to work and have equal opportunity to succeed. No matter your race, gender identity or expression, sexual orientation, religion, origin, ability, age, veteran status, if joining this mission speaks to you, we encourage you to apply!

Why AssemblyAI

AssemblyAI builds the best-in-class Voice AI models powering the next generation of voice applications. Our models serve 600M+ inference calls monthly, process 1M+ hours of audio daily, and power 2 billion+ end-user experiences. The Voice AI space is at an inflection point; we’re looking for folks truly excited to join a small team and help define the future of the industry.

We are one of the most capital-efficient AI companies on the planet - with under 100 people generating roughly $600K ARR per employee, we sit among the top 5 most revenue-dense teams within the fastest-growing AI companies today. That's not an accident; it's a deliberate choice to stay lean, move fast, and give every person on the team outsized ownership and impact. With thousands of customers including Granola, Fireflies, Figure AI, and CallRail, the company has real scale - processing over 2 million hours of audio daily and handling more than 1 million API calls every day. This is a rare growth-stage opportunity where the business is proven and the trajectory is steep, but the team is still small enough that your fingerprints are on everything.

We’re committed to creating a space where our employees can bring their full selves to work and have equal opportunity to succeed. No matter your race, gender identity or expression, sexual orientation, religion, origin, ability, age, veteran status, if joining this mission speaks to you, we encourage you to apply!

About the role:

More and more developers don't read our docs or click through our dashboard. Their coding agent does. Claude Code, Cursor, Codex and others are now how a big share of engineers discover, integrate and debug AssemblyAI. We've spent years polishing the human experience. The agent experience (AX) is newer, growing fast, and almost untouched.

That's the job. You'll own how AI agents build with AssemblyAI: the skills, prompts, MCP server, code samples, docs and integrations an agent reads and runs when a developer says "add transcription to my app." Your north star is simple: an agent should go from zero to a working, production-grade AssemblyAI integration on the first try.

You'll work closely with senior engineers on our Product Engineering team, with real ownership from day one and room to grow into leading AX as the area scales.

What You’ll Do:

• Drive the agent experience. Treat coding agents as a first-class user of AssemblyAI, alongside the humans who use our dashboard and Playground.
• Build and maintain agent skills. Ship skills for our core products (Speech-to-Text, Real-time, Dictation, Voice Agents, TTS, LLM Gateway) that teach agents how to integrate us correctly.
• Build on our MCP server and agent integrations. Extend the AssemblyAI MCP server, help ship agent and MCP auth (OAuth and API keys), and make it easy to plug into Claude Code, Cursor, Codex and whatever comes next.
• Make our docs and code samples agent-ready. Own llms.txt, machine-readable docs, quickstarts and SDK examples so agents pick the right API, parameters and patterns the first time.
• Tune the prompts and instructions behind our product. Improve the system prompts, tool definitions and agent instructions that power our in-dashboard agent and onboarding flows.
• Measure it. Build evals and benchmarks that run real coding agents against real integration tasks. Track success rate, time to first working call, and activation from agent-driven signups.
• Help us scale the playbook. Start with one product and then roll what works across every product.
• Use AI tools as a core part of how you work, and help the rest of engineering build faster with agents.

What You’ll Need:

• 2+ years of professional software engineering experience, with solid full-stack fundamentals (Javascript and/or Python).
• Daily, hands-on use of coding agents such as Claude Code, Cursor or Codex, and real curiosity about what makes them succeed or fail.
• Some hands-on experience writing prompts, skills, tool definitions or agent instructions, at work or side projects, and an interest in measuring them with evals rather than vibes.
• Product sense for developer-facing work. You care whether the developer, or their agent, actually gets to a working integration.
• Clear technical writing. Much of this role is writing that agents and humans both read.
• Comfort with ambiguity and a bias to ship. AX is a new discipline, and you'll learn it and help define it alongside us.

Nice to Have:

• Working knowledge of MCP, LLM tool calling, and how agents read docs and APIs.
• You've built or contributed to an MCP server, agent skill library, or coding agent plugin.
• Developer relations, docs engineering, or SDK experience at an API-first company.
• Experience with Voice AI, speech-to-text, or LLM APIs.
• You've shipped something that agents use in the wild, and can show us the before and after.

Pay Transparency:

AssemblyAI strives to recruit and retain exceptional talent from diverse backgrounds while ensuring pay equity for our team. Our salary ranges are based on paying competitively for our size, stage, and industry, and are one part of many compensation, benefit, and other reward opportunities we provide.

There are many factors that go into salary determinations, including relevant experience, skill level, qualifications assessed during the interview process, and maintaining internal equity with peers on the team. The range shared below is a general expectation for the function as posted, but we are also open to considering candidates who may be more or less experienced than outlined in the job description. In this case, we will communicate any updates in the expected salary range.

The provided ranges are the expected salaries for candidates in the United States (USD) and Canada (CAD). Outside of those regions, there may be a change in the range which will be communicated to candidates throughout the interview process.

USD Salary Range: $160,000 - $210,000

CAD Salary Range: C$225,000 - C$285,000

AI to Interview:

If you're selected for an interview, please review this resource to better understand how AssemblyAI approaches the use of AI in our interview process.

GDPR privacy notice:

Candidates from the EU should review this job applicant privacy notice before applying.

Keep Exploring AssemblyAI:

Speech-to-text | Streaming speech-to-text | Speech Understanding | LLM Gateway
Try the Playground
Our $50M Series C fundraise
Check us out on YouTube!