Senior Full Stack Engineer

HumanSignal is a human data partner for companies building AI models and products. We specialize in real-world data collection, multimodal pipelines, and multi-step workflows, partnering with researchers to enhance AI development.

• Build full-stack features: React/TypeScript on the client; Django/REST services, data models, and background jobs on the server. • Own outcomes, not tasks: refine scope, suggest trade-offs, propose simpler approaches, and land increments that deliver value fast. • Design clean API contracts and evolve schemas/migrations; improve performance and reliability (query tuning, caching, job orchestration). • Partner with Product & Design from discovery to delivery: clarify user jobs, write lightweight RFCs/PRDs, and shape scope and milestones. • Keep UIs accessible and responsive; add solid error-handling and failure-mode UX. • Raise engineering standards: testing strategy, code quality, observability hooks, resilience patterns. • Partner with Support to investigate production issues, reduce UX papercuts, and turn learnings into fixes. • Engage with our open-source community (issues, discussions) to understand real-world needs and improve developer experience. • Participate in architecture discussions and code reviews; mentor teammates and improve patterns across the codebase.

• Senior-level experience shipping production full-stack features (React/TypeScript + Python/Django + SQL). • Strong product sense: you’ve made scope/trade-off decisions and iterated based on real-world usage and feedback. • Fluency with modern FE tooling (e.g., Vite/Webpack, Jest/Cypress) and state-management patterns. • Backend depth: REST API design, relational modeling, migrations, performance tuning, and background job patterns. • Excellent communication at a Senior IC level—you write clear RFCs/PRDs, give actionable reviews, and present trade-offs well. • Nice to have: GraphQL familiarity; Kafka/queues/streaming; Spark/BigQuery; auth/RBAC; multi-tenant SaaS; design-system experience.

• Competitive salary range of $115,000 to $195,500 USD. • Remote work opportunity. • Opportunity to shape the next generation of AI products. • Collaborative work environment with a focus on continuous improvement.

HumanSignal is a software company that provides data labeling, evaluation, and quality workflows for AI and machine learning teams. It is best known for Label Studio, an open-source platform used to prepare training data, fine-tune models, and support human-in-the-loop AI workflows. In 2025, it expanded into multimodal data services and expert annotation through HumanSignal Services.