What is a Software Engineer at HumanSignal?
A Software Engineer at HumanSignal plays a critical role in shaping the future of AI development. As the creators of Label Studio, the leading open-source data labeling and curation platform, HumanSignal sits at the intersection of machine learning, data engineering, and high-performance web applications. In this role, you will build the core tools that AI researchers, data scientists, and enterprise teams use to curate, label, and refine datasets for training advanced machine learning models, including Large Language Models (LLMs) and computer vision systems.
The impact of this position is immense. The features you build and optimize directly influence how thousands of organizations globally prepare their training data, which is the most critical bottleneck in the AI lifecycle. Whether you are working as a Senior Frontend Engineer building highly interactive annotation interfaces, a Senior Backend Engineer designing robust data pipelines and APIs to handle millions of tasks, or a Senior Full Stack Engineer bridging both worlds, your work will be highly visible in both the open-source community and the enterprise product tier.
Working at HumanSignal requires balancing the rapid pace of a venture-backed startup with the architectural discipline needed to maintain a massive open-source codebase. You will tackle unique engineering challenges, such as rendering complex, multi-modal annotation interfaces (combining audio, video, text, and 3D point clouds), optimizing real-time collaborative workflows, and ensuring the platform remains highly performant under heavy data loads. It is a highly collaborative, intellectually stimulating environment where your technical decisions directly shape the modern AI stack.