As a Senior Full-Stack Engineer at blok, you will build production systems that turn complex agentic simulations into actionable product insights. Working across Python and React/TypeScript, you’ll own features end-to-end within a high-velocity engineering tribe, bridging the gap between raw behavioral data and critical product decisions for high-growth customers.
Senior Full-Stack Engineer at blok
Join blok, a high-velocity AI startup backed by MaC VC and a16z scouts, building the future of human-AI behavior simulation. As a Senior Full-Stack Engineer, you'll work alongside Stanford researchers and exited founders to create systems that predict how users act before code even ships.
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Location
San Francisco, United States
Compensation
$180k-$200k + Equity
Company
blok
Role overview
Software15-20 employees
The future of product development in the era of frontier AI. We’re helping product and growth teams simulate user behavior before shipping code. With Blok you can test ideas in hours, not weeks, and uncover issues before they become expensive mistakes. Build with us: https://joinblok.notion.site/Open-Roles-at-Blok-21c5df33b374800da3d2de6fb065eb96
What you will do
- Build and evolve the core Python platform used by customers to design experiments, run simulations, and explore behavioral outputs.
- Translate raw agent behavior into intuitive product functionality, bridging the gap between complex backend simulations and frontend user experiences.
- Design and implement systems that provide visibility and trust, helping users understand why the AI simulated specific human behaviors.
Who this is a fit for
- Over 6 years of experience building end-to-end production systems using Python and React/TypeScript in high-stakes environments.
- Proven track record with AI-native applications, specifically agentic systems or LLM-powered products that solve real-world user problems.
- A product-minded engineer who thrives in ambiguity, values radical candor, and takes extreme ownership of outcomes rather than just code.
Why this role is remarkable
- Join an elite team of 15, including exited founders and researchers from Stanford, MIT, Discord, and Airbnb, solving frontier AI problems.
- Work at the cutting edge of behavioral science and AI, building simulation systems that actually predict how real users think and act.
- Experience high-velocity ownership with bi-weekly shipping cycles, backed by top-tier investors like MaC VC, Weekend Fund, and a16z scouts.
How Jack & Jill work together
I get to know what you’re great at, then find roles you’d never find yourself.Ok, I'll go first. I'm Jack, an AI that gets to know you on a quick call, learning what you're great at and what you want from your career. Then I help you land your dream job by finding unmissable opportunities as they come up, supporting you with applications, interview prep, and moral support.
I recruit from Jack’s network and make the intro when I spot a great match.And I'm Jill, an AI Recruiter who talks to companies to understand who they're looking to hire. Then I recruit from Jack's network, making an introduction when I spot an excellent candidate.
Jack gets to know what you're great at and what you want next, then searches 15 million jobs daily and helps you discover roles at companies like this.
Meet Jack
What happens next?
Jack’s an AI agent for job searching and career coaching. He works for you.
Jill is the AI recruiter working for the company. She recruits from Jack’s network.
If your profile’s a match and blok wants to meet, Jill will make the intro. In the meantime, Jack will send you excellent alternatives.