Alljoined, Inc.

Decoding the Human Mind

Alljoined is a neurotechnology company on a mission to bridge the gap between human thought and technology. Founded in 2023 and based in San Francisco, the team is building the next generation of brain-computer interfaces (BCIs). By leveraging large-scale neural datasets and cutting-edge deep learning models, Alljoined is able to decode images, emotions, and complex cognitive processes from non-invasive brain signals like EEG. With over $7 million in Pre-seed funding backed by prominent investors such as Khosla Ventures and Jeff Dean, the company is pushing the boundaries of what is possible in semantic understanding, abstract reasoning, and intentional planning.

A Culture of Scientific Rigor and Innovation

The culture at Alljoined is deeply rooted in scientific research and engineering excellence. The team consists of world-class researchers and engineers hailing from top institutions, all dedicated to improving human capability and dignity. The company is advised by leading experts in neuroscience and AI, fostering an environment where modern machine learning approaches are combined with serious neuroscience. The goal is not just to build technology, but to create tools that allow computers to empathize with humans and revolutionize mental health and personal growth.

What You'll Actually Do

At Alljoined, you will be at the forefront of neural decoding research. For engineering and research roles, this means working with massive EEG datasets—such as the Alljoined-1.6M dataset, the largest public dataset for EEG-image decoding. You will design, train, and optimize deep learning models that can interpret brain activity in real-time. The work spans from hardware integration to advanced algorithm development, requiring a deep understanding of both software engineering and cognitive neuroscience. For operational roles, the focus is on scaling the company's research capabilities and managing the complex logistics of human subject studies.

Compensation & Benefits

As an early-stage startup, Alljoined offers a unique opportunity to get in on the ground floor of a potentially transformative technology. While specific public salary data is currently Unknown, compensation typically includes a mix of competitive base salary and significant equity options. The company operates primarily in-office in San Francisco, emphasizing close collaboration and rapid iteration. Benefits are aligned with top-tier Silicon Valley startups, focusing on health, wellness, and continuous learning.

The Interview Process

The interview process at Alljoined is rigorous and tailored to the highly specialized nature of the work. While exact details are Unknown, candidates can expect a multi-stage process that includes deep technical assessments, research presentations, and extensive cultural fit interviews. Given the interdisciplinary nature of the team, candidates are evaluated not just on their core competencies, but also on their ability to communicate complex ideas across different domains of expertise.

Why Join / Why Not

Joining Alljoined means working on some of the most challenging and exciting problems in AI and neuroscience today. It is an ideal environment for researchers and engineers who are passionate about BCIs and want to make a tangible impact on how humans interact with technology. The opportunity to work alongside industry luminaries and access unparalleled datasets is a significant draw. However, the work is highly experimental and carries the inherent risks of deep tech startups. The required in-office presence in San Francisco may also not suit those looking for remote or highly flexible work arrangements.