Senior Backend Engineer - AI & SaaS Platform

EuroPython; Kraków; Hybrid; PLN 224,000 - 336,000; Full time

Job summary

ActiveCampaign is expanding its Poland office in Krakow and inviting a seasoned backend engineer to join our Platform & AI Development team. You will build and modernize SaaS backend services using PHP and Python, scale databases like MySQL, DynamoDB and Redis, and contribute to AI workflows and partner tooling while collaborating with Product, Design, and other engineering squads.

This role offers the opportunity to help shape the architecture of our platform and deliver scalable, reliable

Qualifications

• 4+ years of work experience in a backend software engineering role.
• Experience writing production code in PHP following accepted coding standards.
• Experience with Python for backend services or AI workflows.
• Familiarity with DB technologies: MySQL, DynamoDB, Redis.
• Strong problem-solving skills and ability to work across multiple codebases and technologies.

Responsibilities

• Build and enhance backend features across the Agency platform with PHP and Python services.
• Scale SaaS systems and design scalable, configurable partner tooling and API services.
• Implement LLM-powered capabilities and AI workflows for partner experiences.
• Participate in cross-functional collaboration with Product, Design, and other engineering squads; on-call rotation.

Skills

Backend development

PHP

Python

MySQL

DynamoDB

Redis

SaaS scalability

Code quality

Collaboration

Tools

CI/CD

AWS

API design

Platform development

Job description

ActiveCampaign is expanding its Poland office in Krakow and inviting a seasoned backend engineer to join our Platform & AI Development team. You will build and modernize SaaS backend services using PHP and Python, scale databases like MySQL, DynamoDB and Redis, and contribute to AI workflows and partner tooling while collaborating with Product, Design, and other engineering squads.

This role offers the opportunity to help shape the architecture of our platform and deliver scalable, reliable