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
$250k - $350k
...Job Description Job Description Senior Software Engineer - Infrastructure Platform - San Francisco, CA - $250K-$350K Location: San Francisco, CA Work Arrangement: Onsite Overview: We're seeking a Senior Software Engineer to help build and scale the core...SeniorFull timeVisa sponsorshipRelocation package- ...desalination water systems. Description The Senior Project Developer will have... ...process, in partnership with the company’s engineering consultants Real estate entitlement... ...~ Bay area location preferred for our San Francisco office ~ A rapidly growing yet well-...SeniorContract workWork at officeRemote workWork from homeFlexible hours
$250k - $315k
...Job Description Job Description Staff AI Frontend Engineer - San Francisco, CA - $250K-$315K Location: San Francisco, CA Work Arrangement:... ...to relocate. Preferred Qualifications: Founder or founding engineer experience. WebRTC or real-time streaming experience...SuggestedFull timeRelocationVisa sponsorshipRelocation package$150k - $210k
...Candidates must live in or near San Francisco Bay, CA. Proven track record (... ...architecture or systems engineering roles, designing and supporting... ...for our clients. Founded in 1990, World Wide... ...clients across industries. This senior pre-sales role is ideal for...SuggestedFull timeLive inShift work- ...development and hospitality management company, is currently searching for a Maintenance Technician for Harbor Court Hotel in San Francisco, CA . Job Purpose: The Maintenance Technician ensures the safe, efficient, and well-maintained operation of hotel...SuggestedDaily paidFull timeTemporary workFor contractorsSeasonal workWork at officeLocal areaFlexible hoursNight shift
- ...About the job Senior Tax Manager/Principal - San Francisco, CA The Role The Tax Services Division is looking for a Senior Tax Manager or Principal with a minimum of eight (8) years of experience. This outstanding opportunity places the eligible candidate on...SeniorCasual workWork at officeRemote workWork from homeFlexible hours
$130k - $160k
...treatments for rare, deadly diseases. We were founded in 1996 by a family seeking a cure for... ...and awareness Territory to include: San Francisco, CA and Bay Area/ph3Minimum Requirements... ...60,000 per year and the salary for the Senior Cardiopulmonary-PAH (CPS) Specialist is...SeniorLocal areaRemote work$97.4k - $141.2k
...design practice. Our architects, engineers, interior designers,... ...duties under the supervision of a Senior Project Engineer or Project Engineer... ...meetings, and performs other CA tasks. Actively... ...preferred Pursuant to the San Francisco Fair Chance Ordinance, we will...Full timeTemporary workPart timeCasual workWork at office$85.4k - $119.6k
...design practice. Our architects, engineers, interior designers,... ...project under the guidance of a Senior Engineer. You will participate... ...preferred Pursuant to the San Francisco Fair Chance Ordinance, we will... ...Range: • Locations in NYC & CA (Bay Area) & NJ (RP)-$85,400....Full timeTemporary workPart timeCasual workWork at officeShift work$89k - $95k
...Project Engineer - San Francisco, CA DeSimone is a leading global structural engineering firm known for delivering innovative, high-performance... ...field observations and inspections under the guidance of senior engineers. Maintain accurate records of design decisions...For contractorsLocal areaFlexible hours$128k - $240k
...millions of members reach their goals. We are seeking a Senior Software Engineer to join our team. SoFi Invest is SoFi’s new investment platform... ...regard to protected characteristics. Pursuant to the San Francisco Fair Chance Ordinance, we will consider for employment...SeniorWork experience placement- ...CPA firm established in 1989, is based in San Francisco-but active globally-they provide... ...worldwide. They are seeking an on-site Senior Tax Accountant , capable of rapid advancement... ...Full time, W2 Location: San Francicso, CA - (financial district) On-Site Responsibilities...SeniorFull timeWork at officeWorldwide
- ...About this job: Are you warm, friendly, and enjoy helping seniors? We are seeking Helpers and caregivers for private, non-medical senior care in San Francisco, CA. T his role involves assisting with easy, everyday tasks and providing companionship. Ideal for gig...SeniorFull timeTemporary workPart timeFlexible hours
$164k
...Senior Software Engineer, Data Platform Chime San Francisco, CA, US About the Role Chime's Data Platform team builds the infrastructure every engineering and analytics team depends on - ingestion, transformation, quality, governance, and self-serve tooling...SeniorFull timeWork at officeLocal areaRemote workNight shift- ...Sr. Tax Accountant, Private Equity - San Francisco, CA San Francisco, California, United States About the Job Founded in 1964, this XCTR client is an American Private... ...The Role The client is looking for a Senior Accountant to assist with tax services. The...SeniorCasual work
$52 - $60 per hour
...Title: Perm - Technologist - Radiologic Technologist - X-Ray (Varied) East Bay/San Francisco, CA Description: Serves over 7,500 care facilities nationwide. "Great company to work for. Great working environment and developmental training! Feel accomplished...Hourly payPermanent employmentRelocation$115k - $145k
...Tech Company, is seeking an accomplished Senior Energy Consultant to join our expanding Building Science Group in San Francisco, CA and help lead high-impact energy consulting... ...closely with building owners, architects, engineers, and internal project teams to deliver innovative...SeniorFor contractorsWork at officeWorldwide2 days per week- ...About the job Tax Senior or Supervisor - San Francisco, CA The Role The ideal candidate is a team player who manages the tax team to greater performance, creates and implements tax plans, and works with the accounting and leadership teams to identify opportunities...SeniorFull timeTemporary workFlexible hoursWeekend work
$144.5k - $175.1k
...Senior Therapeutic Area Specialist, Oncology/Hematology - San Francisco, CA Working with Us Challenging. Meaningful. Life-changing. Those aren't words that are usually associated with a job. But working at Bristol Myers Squibb is anything but usual. Here, uniquely interesting...SeniorPrivate practiceWork at office$95k - $125k
...Company Description Founded in 1952 and formerly known as... ...ambitious and self-starting Project Engineer to support K-12 and public... ...construction projects in San Francisco. This person will be... ...with LA County ordinance and CA law. Turner & Townsend...Full timeFor contractorsFor subcontractor$60 per hour
...Radiologic Technologist (X-Ray) Mobile/On-Site - East Bay/San Francisco, CA (Perm) San Francisco, CA Up to $60.00 per hour (depending on experience and qualifications) Join a Leading Healthcare Provider with Unmatched Opportunities! Are you a skilled Radiologic...Hourly payDaily paidPermanent employmentRelocation package- ...Senior Accountant - San Francisco, CA San Francisco, California, United States Or refer someone Job Openings Senior Accountant - San Francisco, CA The Role The Family Office Services department handles the daily financial needs of several of the firm's high-net...SeniorTemporary workInternshipWork at officeFlexible hours
$200k
...The next step is to speak to Jack. Job Title: Founding Engineer - Full Stack Salary: $200K+ TC + Equity Company Description: Muro AI - AI-native... ...and 1,500-page plan sets. Location: San Francisco, USA Why this role is remarkable: Unrivaled...- ...Title – Video Conferencing Engineer Position – Contract (6 + Months) With Extensions Location – San Mateo, CA Rate-$Open(Best Possible) Required Skills: Improve/enhance Cisco conference room issues iphone, ipad issues for mobility of applications...Contract work
$150k - $250k
...The next step is to speak to Jack. Job Title: Founding Engineer Salary: $150k - $250k + Equity Company Description: AgentMail - High-growth... ...for a rapidly expanding user base. Location: San Francisco, USA Why this role is remarkable: Unique Market...- ...Advisory & Assurance Senior or Supervisor - San Francisco, CA San Francisco, California, United States The Role The Advisory & Assurance Senior or Supervisor will be responsible for a full array of audit and consulting services for our privately held clients...SeniorFull timeTemporary workFlexible hoursWeekend work
$90k - $100k
...Senior Account Executive You are an IT sales professional with a few years of experience under your belt, and you love selling... ...advancement opportunities. Candidates must be based in the San Francisco, CA area. This is a remote position with the expectation to...SeniorRemote job- ...Senior Territory Manager - San Francisco, CA San Francisco, CA - San Francisco, CA 94102 Overview Salary Range $80,000.00 Base+Commission/month Position Type Full Time Travel Percentage Road Warrior Senior Territory Manager - San Francisco, CA About Precision...SeniorFull timeLocal areaRemote work
- ...About the job Senior Tax Associate - San Francisco, CA The Role The Tax Services Division is looking for a dedicated Senior Tax Associate with a minimum of five (5) years of experience. This position provides room for advancement and growth in a fast-paced...SeniorCasual workWork at officeLocal areaRemote workWork from homeFlexible hours
- ...Senior Cloud Data Operations Engineer Responsibilities Support/Operate an Enterprise Data Services Platform (RedShift/EMR/OpenSearch Service... ...in Scala & Java This is a long-term contract in San Francisco (hybrid/remote). MUST be a US citizen, or at least...SeniorLong term contractContract workRemote work
Do you want to receive more vacancies?
Subscribe and receive similar vacancies to Senior Founding Engineer | San Francisco, CA | Avg $200K-$250K. Be the first to apply!
- senior cost analyst San Francisco, CA
- senior program specialist San Francisco, CA
- senior manager quality engineering San Francisco, CA
- senior software test automation engineer San Francisco, CA
- senior design technologist San Francisco, CA
- senior director corporate development San Francisco, CA
- senior design verification engineer San Francisco, CA
- senior director quality San Francisco, CA
- senior director of development San Francisco, CA
- sr project engineer San Francisco, CA



