Senior Fullstack Engineer
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Job Location:
San Francisco, CA - USA
Monthly Salary:
Not Disclosed
Posted on:
11-10-2025
Vacancies:
1 Vacancy
Job Summary
Senior Full-stack Engineer
San Francisco Full-time On-site $180K $230K Equity
About the Role
This is a rare opportunity to join an early-stage team building foundational systems in AI-driven products. Youll work side-by-side with the founders own critical architecture and product decisions from day one and directly shape the customer experience.
If you thrive in environments where ambiguity is the norm speed matters and getting things done trumps everything else this role is for you.
What Youll Do
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Scale architecture: Design and optimize systems to handle rapid user and traffic growth while maintaining real-time performance.
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Automate AI workflows: Build and own tooling for evaluating and retraining AI models in production ensuring they improve continuously.
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Own the product: Work directly with customers define problems design solutions ship code and iterate quickly.
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Full-stack execution: Develop across the stack (frontend backend integrations) to get users live and delighted.
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Build integrations: Create rich bidirectional features with tools like Slack and Teams to embed the product where customers already work.
Who You Are
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58 years of full-time full-stack engineering experience ideally at YC-backed or top-tier startups.
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Experience in agentic product development and shipping products with real users and revenue.
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A background that blends big tech stability with early-stage startup scrappiness.
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Experience as a technical PM turned SWE is a strong plus.
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Strong CS or engineering degree.
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Full-stack capabilities with high proficiency in TypeScript and React.
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Strong intuition on when and how to use AI with experience leveraging it to accelerate workflows.
Soft Skills & Mindset
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Mission-driven: Deeply interested in and aligned with the companys mission.
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Scrappy builder: Assemble resources to move faster without compromising quality.
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Customer-obsessed: Comfortable speaking with users directly to shape product direction.
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High-agency: Self-directed problem solver who thrives in ambiguous fast-changing environments.
Whats Offered
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Competitive compensation: $180K $230K base salary
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Equity: 0.7 2.0%
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Visa sponsorship available (TN-1 H1B transfers)
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Health dental and vision are fully covered
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High trust high ownership environment micromanagement
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A real shot at something big: Help define the future of AI-powered products
Intake Call Summary
AI Summary
- Josh Lampen and Hans Han are in the San Francisco office discussing the small team size and plans to grow quickly.
- Hans has been following Cartage and expressed interest in the startup space mentioning newsletters and industry figures influenced him.
- Cartage is growing rapidly having completed YC and is seeking to expand its engineering capacity to meet demand.
- The role discussed is for Cartages first full-time hire with high expectations and standards seeking someone akin to a co-founder.
- Candidates should be able to act as their own product managers interface with customers and solve complex problems.
- Cartage differentiates itself by offering significant impact opportunities rapid learning in a small team and potential economic benefits with equity.
- The company is seeking to hire two engineers immediately with the possibility of expanding to four by December. It is open to relocation bonuses but prefers not to offer visa sponsorship.
- Ideal candidates have 3-5 years of experience with founding experience being a significant plus; React TypeScript and Full-Stack skills are must-haves.
- Personality traits desired include low ego resourcefulness and a willingness to learn and adapt in the trucking industry.
- Key interview questions include why candidates are interested in Cartage and why they want to leave their current job. Red flags on the other hand include solely having big tech experience and a history of frequent job changes.
Base hire reward$27000 - $34500(2x)15% first year salary
Key Skills
- APIs
- C/C++
- Computer Graphics
- Go
- React
- Redux
- Node.js
- AWS
- Library Services
- Assembly
- GraphQL
- High Voltage
