Senior Founding Engineer | San Francisco, CA | Avg $200K-$250K
$200k - $250kDirect Line Workforce Solutions
Job Description
Job Description
Senior Founding Engineer | San Francisco, CA | Avg $200K–$250K
Role Overview
A rapidly scaling AI technology company is seeking a Senior Founding Engineer to help architect and scale the infrastructure powering conversational AI evaluation, observability, and simulation systems handling millions of calls per month.
This is a highly technical, architecture-heavy role focused on building resilient, scalable systems across the full stack. The company is looking for engineers who move quickly, think deeply about systems design, and care about building high-performance infrastructure that operates reliably at production scale.
This role is ideal for experienced engineers who thrive in fast-moving startup environments, enjoy solving complex systems problems, and want direct influence over product architecture and engineering culture.
About the Company
The company builds simulation, evaluation, and observability systems for conversational AI agents across voice and multimodal experiences. Founded by former AI engineers from Microsoft and AWS, the platform helps organizations validate and improve AI agent performance before deployment into real-world environments.
Backed by Y Combinator, Floodgate, and PeakXV, the company has experienced rapid growth and now supports millions of AI-powered conversations per month for enterprise customers including major technology and Fortune 500 organizations.
Key Responsibilities
Systems Architecture & Scalability
Architect and develop scalable systems supporting conversational AI evaluation and simulation
Design resilient infrastructure capable of handling millions of real-time interactions
Optimize backend systems, database performance, and frontend responsiveness
Reduce system bottlenecks across distributed services and infrastructure layers
Design systems prioritizing reliability, scalability, and operational efficiency
Full-Stack Engineering
Build and maintain frontend and backend systems across the platform
Develop APIs, real-time systems, and infrastructure services
Improve frontend dashboard performance and user experience
Support CI/CD pipelines and production deployment systems
Contribute to architectural decisions and technical direction
AI & Conversational Systems
Develop pipelines and systems that analyze conversational AI performance
Detect system failures, performance issues, and reliability gaps
Support voice AI and multimodal infrastructure initiatives
Build observability and evaluation tooling for AI agents
Work directly with customers on implementation and deployment efforts
Engineering Leadership & Standards
Establish strong engineering practices around architecture, code review, and system quality
Support scalable engineering workflows within a fast-growing environment
Collaborate directly with founders and leadership teams
Contribute to technical strategy and long-term infrastructure planning
Requirements
Minimum 6 years of full-stack engineering experience
Deep proficiency in:
- TypeScript
- Python
- SQL
- AWS
Strong systems architecture and scalability experience
Experience building and optimizing large-scale production systems
Strong communication and collaboration skills
Comfortable working onsite within fast-paced startup environments
Ability to move quickly while maintaining engineering quality standards
Tech Stack
Frontend:
React
Tailwind
TypeScript
NextJS
Backend:
Python
FastAPI
Supabase
Redis
AWS (Lambda, EC2, WebSockets, SIP)
Voice AI & Infrastructure:
LiveKit
Deepgram
Cartesia
ElevenLabs
Gemini
CI/CD pipelines
Preferred Qualifications
Founding engineer or YC startup experience
Voice AI or conversational AI systems experience
Experience building polished frontend products
Technical founder or VC-backed startup background
Experience within high-performance AI engineering environments
Strong ownership mentality and systems thinking
Compensation & Benefits
Avg Base Salary: $200,000–$250,000
Health Insurance
Gym Membership Reimbursement
$500 Workspace Setup Stipend
High ownership and direct impact opportunity
Fast-moving engineering culture with strong growth trajectory
Interview Process
Intro Call with Founder
Take-Home Assignment
Technical Interview
Onsite Work Trial
Final Offer
Work Environment
Onsite in San Francisco, CA
Collaborative startup environment
Direct access to founders and leadership
High-growth AI infrastructure company
Expanding engineering organization
Ideal Candidate
Highly technical full-stack engineer with strong architecture depth
Comfortable operating in high-scale production environments
Strong systems thinker and problem solver
Fast-moving, execution-oriented engineer
Low ego with strong communication skills
Passionate about mastering technical and personal challenges
Excited about building infrastructure powering the future of conversational AI
$200k - $250k
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