Founding Fullstack Engineer

Founding Engineer Role At Hub.xyzRobot foundation models learn physical behavior from human demonstration, and real-world data has become a critical bottleneck in embodied intelligence.Hub provides real-world training data to frontier AI labs and robotics companies, scaling multiple 7 to 8 figure contracts in parallel. Our network of 150,000+ users captures egocentric human data across all continents, and we run collection, processing, QA and annotation in-house, end to end.Hub's mission is to advance embodied AGI through real-world data and research.We're assembling a unique team of exceptional and relentless individuals, willing to dedicate themselves fully to the achievement of this mission.The RoleAs a founding engineer you own some of the most critical systems in the company.Multiple platforms with 150K+ users collecting data: B2C, B2B, mobile app, internal.Anti-fraud and automated QA systems. You own the quality of what we deliver every day.Heavy backend, keeping architecture and ops efficient as we scale to 1M+ users.Payout systems moving daily high volumes of money across 100+ countries.Live production serving multiple top 5 AI companies, hard deadlines and specs.The ProfileGraduates from top French engineering schools, ideally through classes préparatoires, 6 months to 3 years of experience. More experience is welcome when the track record justifies it. We look for outliers with outstanding achievements and grit.Exceptional individual achievement: elite rankings at competitions or concours, hackathons won, system you hacked, projects at real scale or revenue.You live for programming. Thousands of contributions on GitHub this year, active open-source participation (e.g. frequent late-night commits on weekends on your own).You treat agentic engineering as a craft. You research the field daily and always run a SOTA customized harness.You're willing to sacrifice to be part of an extraordinary journey, working at the center of the embodied AGI frontier alongside the biggest AI labs.Bonus: experience developing mobile apps for iOS or Android.CultureSmall core team by design. Y Combinator + SF high-performance culture and pace.European founders, team across SF & Europe.High accountability. Features owned end to end: design, build, ship, support.Tokenmaxxing ethos. Uncapped frontier models, fleets of agents, shared skills and KB.Multiple features shipped per day, output of an org 50 times the size.Constant proactive communication. Slack, huddles, short stand-ups. No black box.We hold a higher bar for ourselves than anyone could hold for us.StackPython, FastAPI, Postgres, React, Docker, AWS and S3, versioned REST APIs.Mobile: React Native and Expo, one codebase across iOS and Android, ARKit and ARCore under it for egocentric video capture. RGB+IMU sync, MCAP out.Multimodal pipelines at petabyte scale: ingestion, VLM QA and labeling, fraud detection, stereo depth and hand reconstruction, delivery in MCAP and LeRobot.We build our own custom platforms, not assembled SaaS: contributor app, commercial platform, mobile app, internal, payouts.What We OfferFounding engineer in one of the fastest-growing Y Combinator startups.$80,000 to $100,000 yearly salary, stock options between 0.25% and 1%.Remote, based in France. Paris office opening soon.Direct work with the founders. Direct work with top AI labs.ProcessA short application read by the founders. We open your handles first: your GitHub with real commits, individual achievements, repos of projects you built.One conversation, then a build task from the real work.We watch how you approach the problem, how you break it down, what you measure, and how you verify your own work.Final conversation.