Senior Full-Stack Engineer, AI Platform, Alignerr

Shape the Future of AI

At Labelbox, we're building the critical infrastructure that powers breakthrough AI models at leading research labs and enterprises. Since 2018, we've been pioneering data-centric approaches that are fundamental to AI development, and our work becomes even more essential as AI capabilities expand exponentially.

About Labelbox

We're the only company offering three integrated solutions for frontier AI development:

1. Enterprise Platform & Tools: Advanced annotation tools, workflow automation, and quality control systems that enable teams to produce high-quality training data at scale
2. Frontier Data Labeling Service: Specialized data labeling through Aligner, leveraging subject matter experts for next-generation AI models
3. Expert Marketplace: Connecting AI teams with highly skilled annotators and domain experts for flexible scaling

Why Join Us

• High-Impact Environment: We operate like an early-stage startup, focusing on impact over process. You'll take on expanded responsibilities quickly, with career growth directly tied to your contributions.
• Technical Excellence: Work at the cutting edge of AI development, collaborating with industry leaders and shaping the future of artificial intelligence.
• Innovation at Speed: We celebrate those who take ownership, move fast, and deliver impact. Our environment rewards high agency and rapid execution.
• Continuous Growth: Every role requires continuous learning and evolution. You'll be surrounded by curious minds solving complex problems at the frontier of AI.
• Clear Ownership: You'll know exactly what you're responsible for and have the autonomy to execute. We empower people to drive results through clear ownership and metrics.

Role Overview

As a Senior Full-Stack Engineer on the Alignerr engineering team, you will play a key role in building and maintaining an internet-scale platform that facilitates the hiring and onboarding of specialized experts who train and tutor AI systems. Your work will directly contribute to Labelbox’s AI platform by developing the features and capabilities that enable these AI trainers to provide high-quality human feedback.

Your Impact

• Shape the future of AI alignment by building intuitive, scalable interfaces that enable experts in specialized fields to train AI and contribute to the development of powerful LLMs.
• Enhance product capabilities by collaborating with engineers, product managers, and designers to deliver new features, resolve issues, and maintain a high-quality codebase while managing technical debt.
• Solve complex engineering challenges by designing and implementing solutions that improve system performance, scalability, and adaptability in an evolving AI landscape.
• Improve customer experience by working closely with the support team to diagnose and resolve issues, ensuring users have seamless interactions with our platform.
• Ensure system reliability by participating in on-call rotations, proactively monitoring system health, and addressing potential disruptions before they impact users.
• Drive engineering excellence by identifying and implementing process improvements that enhance team efficiency and accelerate product development.
• Contribute to knowledge sharing by documenting technical decisions, writing clear and concise technical guides, and mentoring teammates to strengthen the team’s overall expertise.

What You Bring

• Full-stack expertise with 2+ years of experience building seamless user experiences on the frontend and designing scalable, reliable backend systems.
• Proficiency in modern technologies, including TypeScript, Node.js, and GraphQL, with experience in Python, Kubernetes, and Google Cloud (MySQL, Spanner, GCS, PubSub) to architect efficient and high-performing solutions.
• Frontend development experience (2+ years) with frameworks like React/Redux or Angular, ensuring designs translate into responsive, interactive user interfaces.
• A strong sense of ownership, continuously driving improvements in both the product and team dynamics while pushing for innovative solutions that enhance customer experience.
• An agile mindset, thriving in fast-paced environments where you take initiative, adapt quickly, and devise elegant solutions to complex technical challenges.