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**