Senior Member of Technical Staff

Thomas Talent Network; San Francisco (CA); On-site; USD 225,000 - 300,000; Full time

Job summary

Confidential client, a seed-stage startup building the simulation and evaluation layer for Voice AI agents, seeks a Senior Member of Technical Staff. You will architect and develop systems for conversational AI, scaling AWS infrastructure to handle millions of real-time conversations, surface insights, and ensure safety and alignment with human intent.

The role is on-site in San Francisco, requiring senior-level ownership and deep experience across the stack. Visa sponsorship is not available.

Qualifications

• 6+ years of engineering experience.

Responsibilities

• Architect and develop simulation, analysis, and evaluation systems for conversational AI (voice and multimodal).
• Build resilient, scalable AWS infrastructure for millions of real-time conversations.
• Create algorithms and pipelines to surface insights and detect failure modes.
• Own your work across the stack from design to deployment.

Tools

AWS

Lambda

EC2

WebSockets

SIP

Job description

Confidential client — a Seed-stage startup (1-10 employees) building the simulation, observability, and self-improvement layer for Voice AI agents, with a mission to be the trust layer between AI and humanity. The founders previously built critical infrastructure at major cloud and AI companies. Voice is the hardest modality for AI, and the company builds the simulation, observability, and evaluation infrastructure to make voice the default medium between humans and technology. In just one year, large technology, healthcare, banking, and food-service organizations across five continents have used the product to understand and improve their Voice AI agents. Raised a $4M seed, sustained on seven-figure revenue, handling millions of calls a month. Team of 10, based in a San Francisco office. Full-Time, In-person, San Francisco, CA. Experience: 6+ years. Salary: $225,000-$300,000/yr. Visa sponsorship: None available.

About the Role:

As a Senior Member of Technical Staff, you'll play a pivotal technical role: architecting and developing systems that simulate, analyze, and evaluate conversational AI agents across voice and multimodal systems, and designing resilient, scalable infrastructure on AWS (Lambda, EC2, WebSockets, SIP) to handle millions of real-time conversations. You'll build algorithms and pipelines that surface insights, detect failure modes, and keep agents safe, reliable, and aligned with human intent. This is a high-bar, full-ownership role on a tiny team, with proficiency expected across the stack, especially databases, AWS, and AI engineering. It's also customer-facing: you'll work on-site with customers, building, selling, and deploying the product to some of the largest companies in the world. The company wants senior engineers who obsess over details, can lead a project's technical execution end to end, and have built high-traffic features at scale.

What You'll Own:

• Architecting and developing simulation, analysis, and evaluation systems for conversational AI (voice and multimodal)
• Resilient, scalable AWS infrastructure (Lambda, EC2, WebSockets, SIP) for millions of real-time conversations
• Algorithms and pipelines that surface insights, detect failure modes, and keep agents safe and aligned
• Full ownership of your work, across the stack

Company stage: Seed. Work type: In-person (San Francisco, CA). No visa sponsorship available.