Staff Full Stack Engineer

The power of prediction starts with HumanSignal. We build software that helps people do what only they can do – give meaning

Data fills our modern world. It flows prolifically inside organizations, customer interactions, through product usage, environmental research, healthcare imaging, and beyond. What if we could use any of that historical data to predict the future? The fact is, in most cases we can make predictions through Machine Learning and AI, but to do so in a meaningful and impactful way, historical data needs to be accurate, comprehensive, and absent of bias. 

In order to make the best predictions, we believe internal teams with domain expertise should be responsible for annotating and curating data. It's called data labeling, and it’s a process of real people giving meaning to the information they see on the screen. HumanSignal was founded to take data labeling to the next level. 

We believe that data labeling is a team sport. Data scientists, subject matter experts, engineers, operations, and annotators must work collaboratively to ensure quality results and an efficient process. That’s why we created Label Studio, which has quickly become the most popular open source data labeling platform with a 250K+ users around the world and millions of labeled samples, alongside a community of thousands of data scientists sharing knowledge and working to advance data-centric AI.  

In late spring 2022, HumanSignal raised $25 million in Series A funding, bringing our total funds raised to $30 million from notable investment partners Redpoint Ventures, Unusual Ventures, Bow Capital, Swift Ventures, as well as angel investors.

HumanSignal is a fully distributed organization with people all over the world. We have team members in North America, Europe, and South America across 6 countries. 

About the Opportunity:

HumanSignal is seeking a talented Full Stack Engineer who thrives on building end-to-end solutions that empower our platform’s user experience while ensuring scalability and reliability on the backend. As a Full Stack Engineer, you will work closely with product managers, designers, and other engineers to develop robust, intuitive, and performant web applications. You will have the opportunity to influence the entire technology stack, from database architecture to user interfaces, playing a crucial role in delivering value to our rapidly growing user base. This role is ideal for engineers who enjoy the challenges of working across the entire stack and are passionate about creating impactful software that democratizes data labeling through AI and automation.

Responsibilities:

• Develop and maintain both backend services and frontend components of our data labeling platform, ensuring high performance, scalability, and excellent user experience.
• Design and build RESTful APIs and other backend services to support new and existing features, ensuring seamless integration with the frontend.
• Create and maintain responsive and accessible user interfaces using modern JavaScript frameworks, focusing on delivering intuitive and user-friendly experiences.
• Collaborate closely with product, design, and other engineering teams to translate requirements and mockups into complete solutions that align with our business goals.
• Participate in code reviews, architecture discussions, and contribute throughout the entire development process, from ideation to production deployment.
• Identify and implement areas of improvement across both frontend and backend codebases, driving changes that enhance the overall quality and maintainability of our platform.
• Establish and uphold best practices, coding standards, and development guidelines for both frontend and backend systems.
• Mentor all engineers across the stack, providing guidance on best practices, code quality, scalable and performant system design and professional growth.

What You'll Bring:

• Extensive experience developing full stack applications, with proficiency in both backend (Python, Java, Go, Kotlin, Scala, Rust) and frontend (React, Angular, Vue.js) technologies.
• Strong knowledge of HTML, CSS, and JavaScript (ES6+), with a focus on cross-browser compatibility, accessibility principles, and delivering high-quality, maintainable code.
• Proven experience building and integrating scalable backend services and APIs, with expertise in frameworks like FastAPI, Django, or similar.
• Familiarity with database systems (Postgres, BigQuery) and experience working with streaming event and messaging architectures (Kafka, Spark).
• Comfort working acro