Senior Software Engineer - activecampaign

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

Track record of identifying and delivering performance improvements in production systems

Experience with SaaS productization

This is an exciting time to join ActiveCampaign as we build out our new office in Poland. You will be a large part of developing our office culture in this new Krakow hub location.

About ActiveCampaign:

ActiveCampaign is the autonomous marketing platform for people at the heart of the action. It empowers teams to automate their campaigns with AI agents that imagine, activate, and validate–freeing them from step-by-step workflows and unlocking limitless ways to orchestrate their marketing.

With AI, goal-based automation, and 1,000+ app integrations, agencies, marketers, and owners can build cross-channel campaigns in minutes–fine-tuned with billions of data points to drive real results for their unique business.

ActiveCampaign is the trusted choice to help businesses unlock a new world of boundless opportunities–where ideas become impact and potential turns into real results.

As a global multicultural company, we are proud