Senior Software Engineer - ActiveCampaign

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

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