Senior Backend Engineer - AI-Driven Multi-Tenant Platform

beqom; Kraków; On-site; PLN 240,000 - 360,000; Full time

Job summary

beqom in Kraków is seeking a Senior Backend Engineer to join the Data Platform Core team, owning services at the heart of our data architecture, including multi-tenant data ingestion, schema management, and analytics-ready contracts.

You will collaborate with Data Platform, Analytics, Support, and Product teams in an AI-first environment, leveraging .NET 8/C#, PostgreSQL, and MassTransit to deliver scalable, observable backend services.

Qualifications

• 5+ years of production backend development
• Strong SQL and PostgreSQL design and optimisation
• Experience with multi-tenant SaaS architectures

Responsibilities

• Design and build features across multi-tenant data platform services
• Collaborate with Data Platform, Analytics, Support and Product teams
• Mentor engineers and contribute to agent-driven development practices

Skills

Senior backend engineer

.NET/C#

SQL/PostgreSQL

AI-driven development

Multi-tenant SaaS

Excellent written communication

Tools

EF Core

Dapper

MassTransit

RabbitMQ

Claude Code

OpenTelemetry

Job description

beqom in Kraków is seeking a Senior Backend Engineer to join the Data Platform Core team, owning services at the heart of our data architecture, including multi-tenant data ingestion, schema management, and analytics-ready contracts.

You will collaborate with Data Platform, Analytics, Support, and Product teams in an AI-first environment, leveraging .NET 8/C#, PostgreSQL, and MassTransit to deliver scalable, observable backend services.