Senior Full-Stack Engineer ($180k-$200k + Equity) at blok

About the Company

blok is an AI-native startup backed by MaC VC, Protagonist, Weekend Fund, and a16z scouts, building behavioral simulation systems. Founded by exited founders and researchers from Stanford and MIT, they help product teams predict human behavior at scale by testing decisions through AI agents before shipping.

About the Role

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.

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.

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.

Qualifications

• 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.