Back End Developer

Varolio turns traditional businesses into AI-native organizations. Our platform transforms messy operational data into a live model that drives fully automated AI delivery, from uncovering hidden bottlenecks to building and deploying tailored solutions.

We’re looking for a Backend Engineer with strong AI experience to take ownership of critical parts of our ontology engine, agent harnesses, and data infrastructure.

You’ll transform complex, imperfect information from multiple systems into a reliable model that lets our solutions understand the customer’s business and act on it.

**What you’ll own**

• Data & Ontology: Design and evolve data models and ontologies that represent real operational processes.

• Agent systems: Build agent harnesses, multi-agent orchestration, tool execution, and context management.

• Data infrastructure: Build storage, indexing, retrieval, APIs, and durable asynchronous workflows.

• Quality & evaluation: Build evaluation harnesses and benchmarks; own regression testing, typed outputs, validation, and provenance.

• Production performance: Own reliability, observability, latency, and cost optimization.

**What you bring**

• 5+ years building production backend systems, with strong architecture and system-design skills.

• Strong data modelling, with experience in different types of databases and search infrastructure, such as Elasticsearch and Postgres.

• Experience with distributed and asynchronous systems: queues, retries, idempotency, and backfills, such as Temporal.

• Hands-on experience building LLM agents, including agent harnesses, tool calling, and context engineering.

• Experience working with large, incomplete, or conflicting datasets from multiple sources.

• Experience evaluating AI systems, debugging failures, and improving accuracy and reliability.

• Rigour and curiosity: you care about the business logic behind the data, not only moving records from A to B.

You’ll work directly with the founding team and help shape the architecture and engineering practices behind the product.

We are a small, ambitious team building from the ground up. There is no playbook here. You’ll have both the space and the responsibility to shape the foundations of a product that turns complex customer reality into reliable AI systems.

You’ll thrive here if you enjoy high ownership, are comfortable with ambiguity, and are motivated by turning messy operational reality into something clear, reliable, and useful

Interested? Send your CV to careers@varolio.io with the role title in the subject line

Tel Aviv (near HaShalom Train Station) | Full-time