FortyFive LabsFortyFive Labs

    Join Our Mission

    We're building the human data infrastructure to create useful and aligned AI. Partner with us to work on the future of robot safety and capabilities.

    Backed by top AI researchers
    In-person culture
    Competitive compensation

    Open Positions

    Senior Software Engineer - Backend/Infrastructure

    EngineeringCambridge, On SiteFull-time

    Build the human data infrastructure to create useful and aligned AI. Partner with AI teams at Anthropic, Meta, Google on RLHF, model evaluations and more. Join a lean, talent-dense team.

    Requirements:

    • 5+ years of backend development experience
    • Experience with distributed systems and cloud infrastructure
    • Strong programming skills in Python, Go, or similar languages
    • Experience with databases and data processing pipelines
    • Experience with WebXR and spatial computing platforms
    • No prior AI experience required

    Key Skills:

    Python
    Go
    AWS
    Kubernetes
    PostgreSQL
    WebXR
    WebGPU

    Senior Full-Stack Product Engineer

    EngineeringCambridge, On SiteFull-time

    Lead product development for our human data platform. Build intuitive interfaces that enable high-quality data collection and annotation workflows.

    Requirements:

    • 5+ years of full-stack development experience
    • Experience with React, TypeScript, and modern web technologies
    • Strong product sense and user experience focus
    • Experience building scalable web applications
    • Experience with WebXR, WebGL, and 3D web technologies
    • Interest in AI/ML applications

    Key Skills:

    React
    TypeScript
    Node.js
    Python
    SQL
    WebXR
    WebGL
    Three.js

    Machine Learning Engineer

    AI ResearchCambridge, On SiteFull-time

    Work on RLHF pipelines, model evaluations, and alignment research. Collaborate with top AI research teams to improve model safety and capabilities.

    Requirements:

    • 3+ years of ML engineering experience
    • Experience with PyTorch, TensorFlow, or similar frameworks
    • Knowledge of reinforcement learning and RLHF
    • Experience with large language models
    • Strong Python programming skills
    • Interest in spatial AI and WebXR applications

    Key Skills:

    PyTorch
    Python
    RLHF
    Transformers
    CUDA
    WebGPU
    WebXR

    Data Scientist - robot safety

    AI ResearchCambridge, On SiteFull-time

    Design and analyze experiments for robot safety research. Work on model evaluations, alignment metrics, and safety benchmarks.

    Requirements:

    • PhD in relevant field or equivalent experience
    • Strong statistical analysis and experimental design skills
    • Experience with robot safety or alignment research
    • Proficiency in Python and data analysis tools
    • Published research in robot safety or related areas
    • Experience with spatial computing and XR technologies

    Key Skills:

    Python
    R
    Statistics
    robot safety
    Research
    WebXR
    Spatial Computing

    Operations Lead

    OperationsCambridge, On SiteFull-time

    Scale our human data operations and quality assurance processes. Manage relationships with data labeling teams and ensure high-quality outputs.

    Requirements:

    • 3+ years of operations or project management experience
    • Experience managing distributed teams
    • Strong attention to detail and quality processes
    • Experience with data quality and labeling workflows
    • Excellent communication and organizational skills
    • Interest in XR and spatial computing workflows

    Key Skills:

    Project Management
    Quality Assurance
    Team Leadership
    Process Design
    XR Operations

    Product Manager - AI Platform

    ProductCambridge, On SiteFull-time

    Lead product strategy for our AI data platform. Work closely with engineering and research teams to build products that enable better AI alignment.

    Requirements:

    • 5+ years of product management experience
    • Experience with B2B SaaS or developer tools
    • Understanding of AI/ML workflows and challenges
    • Strong analytical and strategic thinking skills
    • Experience working with technical teams
    • Knowledge of WebXR and spatial computing markets

    Key Skills:

    Product Strategy
    B2B SaaS
    Analytics
    Roadmap Planning
    WebXR
    Spatial Computing

    Why Work With Us

    [ Impact ]

    Work on critical robot safety challenges that will shape the future of artificial intelligence.

    [ Team ]

    Join a lean, talent-dense team of researchers and engineers from top institutions.

    [ Growth ]

    Learn from industry leaders while working on cutting-edge AI alignment research.

    Application Process

    [ 1 ]

    Apply

    Email us your CV, transcript and availability.

    [ 2 ]

    Screen

    We will get back to you within the same day.

    [ 3 ]

    Coding Project

    We will give you a technical problem to solve. Time is uncapped.

    [ 4 ]

    Offer

    Welcome to the team!