Senior Backend Developer (Python)

Senior Backend Developer (Python) New Technology Division of KATA-GROUP – Building a Global Product

We are looking for a Senior Backend Developer for hands-on production work, with full responsibility for logic, state, and system integrity. The role focuses on building an event-driven backend system, handling unstructured data and complex operational flows.

Responsibilities

Production-grade Python backend development (not POC) Working with event-driven systems and persistent state Managing sessions, event ordering, idempotency, and deduplication Building operational flows from unstructured data such as free text, emails, and messages Ensuring data accuracy, consistency, and the ability to provide system explainability Working with a Node.js layer for WhatsApp integration including protocols and sessions

Requirements

6+ years of experience in Backend development Strong Python skills with an emphasis on Production and Event-Driven architecture Hands-on experience with Databases such as PostgreSQL, MongoDB, or Redis Deep understanding of persistent state, idempotency, ordering, and failure handling Ability to work independently and take full ownership of a live system

Significant Advantages

Experience with entity modeling and long-term relationships Working with Graphs at the data model or GraphDB level Experience with GraphRAG or Explainable AI Working with unstructured data including NLP and free text Integration with WhatsApp or Email systems Experience with OCR and documents such as invoices and certificates