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Senior Software Engineer

ActiveCampaign - Krakow

Posted May 6, 2026

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About this role

Senior Software Engineer Krakow What your day could consist of: - Agency Platform & AI Development Building and enhancing features across the Agency platform including partner tooling, multi-account management, and API services in PHP Designing and implementing agentic AI workflows that automate and enhance partner and reseller experiences Integrating LLM-powered capabilities into core Agency features - from intelligent recommendations to automated partner operations Contributing to our Python-based AI agent development and iteration Driving productization - evolving Agency features to be more scalable and configurable for diverse partner needs Maintaining and evolving legacy codebases while driving modernization efforts - Collaboration Working with cross-functional teams including Product, Design, and other engineering squads Engaging in pairing and code reviews Participation in the on-call rotation for incidents What we're looking for: Required: - 4+ years of work experience in a backend software engineering role - Demonstrated knowledge of the challenges of scaling SaaS systems - Experience writing production code in PHP following accepted coding standards - Experience with Python for backend services or AI/agentic workflows - Familiarity with DB technologies: MySQL, DynamoDB, Redis - Strong problem-solving skills and ability to work across multiple codebases and technologies Nice to have: - Experience building or integrating AI/ML systems, LLM-powered features, or agentic workflows - Deeper database expertise - query optimization, data modeling, schema design, or experience with data pipelines and analytics infrastructure - Familiarity with CI/CD practices and patterns - Knowledge of AWS (or any public cloud) - Experience with API design and platform/partner ecosystem development

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