Senior Software Engineer
ActiveCampaign · Krakow, Poland
About The Role
What your day could consist of
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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
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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
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- 4+ years of work experience in a backend software engineering role
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- Demonstrated knowledge of the challenges of scaling SaaS systems
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- Experience writing production code in PHP following accepted coding standards
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- Experience with Python for backend services or AI/agentic workflows
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- Familiarity with DB technologies: MySQL, DynamoDB, Redis
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- Strong problem-solving skills and ability to work across multiple codebases and technologies
Nice to have
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- Experience building or integrating AI/ML systems, LLM-powered features, or agentic workflows
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- Deeper database expertise — query optimization, data modeling, schema design, or experience with data pipelines and analytics infrastructure
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- Familiarity with CI/CD practices and patterns
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- Knowledge of AWS (or any public cloud)
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- Experience with API design and platform/partner ecosystem development
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- Track record of identifying and delivering performance improvements in production systems
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- Experience with SaaS productization
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