Member of Technical Staff: Full-Stack
About this role
before anything ships.
The hardest part of building products isn't writing code - it's predicting human behavior. Until now, it's been guesswork. Seldon (formerly Blok) changes that: our multi-agent simulation engine predicts how real users respond to digital experiences before anything ships.
We're a high-velocity team of ~20 exited founders, engineers, researchers, and adventurers from 10 countries, backed by MaC VC, Protagonist, Rackhouse, Blank, and Weekend Fund, plus scouts at a16z, Greylock, and CRV. We're hiring a Member of Technical Staff (Full-Stack) to connect complex backend systems - multi-agent simulations, evaluation pipelines - to the frontend experiences customers use to decide what to build next.
Core platform - Build and evolve the Seldon platform (Python): where customers design experiments, run simulations, explore behavioral outputs, and decide what to ship.
Agent-to-product translation - Turn raw agent behavior into product functionality, bridging "what the system did" and "what the user should do next."
System visibility & trust - Build tooling that makes the system understandable, debuggable, and trustworthy.
User agency & decisions - Help define how users interact with simulations and make decisions from them.
Velocity & ownership - Own features end-to-end (backend to frontend to user impact), ship bi-weekly, and define best practices as we scale.
8+ years building production systems across the stack, with a bias toward backend - an IC by choice, not a people manager
AI-native: hands-on with LLMs, agents, and simulation systems - you build for the user, not just the tech
Product engineer at heart: zero-to-one features that shipped and stuck, moving fast without regressing quality
High ownership, low ego: humble, coachable, and hungry for feedback
SF-based: SoMA HQ Mon/Tue/Thu with the team, WFH Wed/Fri
Any background: dropouts to PhDs - how you think, build, and work in teams beats pedigree
Bonus: experience designing agentic systems or LLM-powered products, building internal tools or complex product workflows, or working in highly regulated environments.
$180-200k + meaningful equity upside · 100% paid medical, dental & vision · 28 days PTO · beautiful SoMA office optimized for deep work · 2 annual offsites plus regular team dinners and events
Company at a glance
Seldon provides decision layer for product development using a multi-agent simulation engine to predict user responses and surface friction. It uses personas from analytics and ethnography, matches behavior 87% across Big Five traits, and is SOC 2 Type II compliant.
Top Benefits
- WFH: 2 days/week (Wed & Fri) to catch up on laundry, save time commuting, and let your cat walk across the keyboard
- Adventures: 2 annual offsites (we’re back from Las Vegas and planning something fun in Sept), plus we host regular team dinners and events in the city
- Environment: Beautiful office in SoMa, fully stocked, and optimized for deep work
- PTO: 28 days (inc 5 company days on stats) that we all take (even our founders)
- Health: 100% paid medical, dental & vision
What happens next
Skip the application pile. I get you in front of the people who decide.
Confirm the fit
A few questions to make sure this role is the right shape for you. Two minutes.
I pitch you to the company
I write the intro, send it to the founder, and handle the back-and-forth.
A meeting lands on your calendar
When the company wants to meet, I get the call on your calendar. You just show up.
Know someone who'd be great for this?
