SENIOR/STAFF/PRINCIPAL PRODUCT ENGINEER – FULL STACK
Harnham
San Francisco, CA · Posted November 6, 2026
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November 2026
- #1Best cities for security jobs316 openings · of 20
- #1Best cities for technology jobs7,178 openings · of 100
- #1Best cities for financial services pay after cost of living$173k · of 33
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- #1Cities with the most jobs that do not need a four-year degree in the West Coast902 jobs · of 47
Rankings about engineering jobs
- Best cities for software and engineering jobs #1 San Francisco (3,412 openings)
- Best cities for engineering pay after cost of living #1 San Mateo ($216k)
- Most requested AI skills in engineering jobs #1 AI tools in daily work (6.1%)
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Pay compared with the market
This listing does not state pay. Across 180 open senior listings that state pay, the middle half runs $177,000 to $256,000 and the median is $222,500.
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How AI is used in this kind of work
AI use among mechanical engineers is little observed so far. Measured exposure for mechanical engineers: 8% (little observed).
Share of this job’s tasks that AI is already used for at work, from real usage. It is not a forecast of job loss, and a low number means no use seen yet. Source: Anthropic Economic Index.
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About the job
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SENIOR/STAFF/PRINCIPAL PRODUCT ENGINEER – FULL STACK
SAN FRANCISCO, CA (ONSITE – 5 DAYS/WEEK)
$175,000 – $300,000 + EQUITY + BENEFITS
The Opportunity
We’re partnering with a high-growth, AI native technology company to hire a Staff/Principal Product Engineer with strong TypeScript, Node.js, and full-stack engineering experience to help build and scale an innovative AI-powered platform.
The company is transforming their industry by automating manual workflows for their enterprise clients. This is a hands-on senior IC opportunity with significant ownership over product development, technical execution, and customer experience.
The Engineering Environment
Full-stack application development leveraging TypeScript and Node.js
Building intelligent AI solutions to streamline complex business processes
Developing scalable platforms and intuitive user-facing products
Working with large datasets, document processing, and enterprise integrations
Collaborative startup setting with a small, highly experienced engineering team
What You’ll Be Working On
Engineer new features across the frontend and backend of the platform
Create and improve AI-driven tools that automate manual workflows
Lead feature development from initial design through production launch
Partner with customers to identify challenges and deliver product enhancements
Improve system efficiency, reliability, and overall application performance
What We’re Looking For
6+ years of hands-on software engineering experience
Strong TypeScript skills with practical Node.js experience
Track record of delivering successful, customer-facing software products
Experience launching products or features from the ground up in 0-to-1 environments
Excellent communication skills and ability to excel in fast-moving startup teams
Why This Role
Join an emerging AI company experiencing significant enterprise adoption
Build technology that modernizes and improves a large, established industry
Influence product strategy and have meaningful technical ownership
Collaborate closely with founders and senior engineering leaders
Competitive salary, equity participation, and comprehensive benefits
This is an opportunity for a product-minded engineer who enjoys building from the ground up, taking ownership, and solving real customer problems through technology.
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