The vacancy is well-structured and informative, providing clarity on responsibilities and expectations.
Job description
At HumanSignal, we’re building the platform that powers the creation, curation, and evaluation of high-quality data for AI. Our open-source product, Label Studio, is widely adopted for labeling and evaluating data across various modalities. We focus on ensuring models are grounded in real-world signals.
Responsibilities
- Design, build, and operate backend services/APIs in Python/Django with Postgres/Redis.
- Own outcomes, not tasks: refine scope, suggest trade-offs, and land increments that deliver value quickly and safely.
- Model data and author migrations; tune queries and caching; manage background jobs/queues for high-volume workflows.
- Evolve API contracts with FE; keep interfaces clear, versioned, and resilient to change.
- Improve reliability and performance (timeouts, retries, idempotency, rate limits, pagination, backpressure).
- Implement secure, multi-tenant patterns: auth, permissions/RBAC, auditability, and safe data boundaries.
- Contribute to testing strategy (unit/integration), error handling, and graceful failure modes.
- Partner with Support to investigate production issues and turn learnings into fixes and prevention.
- 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.
Requirements
- Senior-level experience shipping production backends in Python/Django (or a close equivalent) and SQL.
- Strong product sense: you’ve made scope/trade-off decisions and iterated based on real-world usage and feedback.
- Depth in REST API design, relational modeling, migrations, and performance tuning.
- Experience with background processing/queues (e.g., Celery/RQ/Kafka-backed workers) and operational concerns.
- Clear written communication at a Senior IC level—concise RFCs/PRDs, actionable reviews, and crisp decision records.
- Nice to have: GraphQL familiarity; Kafka/streaming; Spark/BigQuery; security/compliance exposure; multi-region architectures.
About HumanSignal
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.