Hybrid Software Engineer, Agent Development

at ActiveCampaign

• Job title: Software Engineer, Agent Development
• Job type: Full Time
• Experience level: Junior, Mid level
• Salary: PLN 184,000 - PLN 276,000 per year
• Degree requirement: Bachelor's Degree
• Tech skills: AWS, DynamoDB, Ember.js, MySQL, PHP, Python, React, Redis
• Location requirements: Hybrid, Krakow, Poland

About the role

• Software Engineer developing AI agents for ActiveCampaign's marketing automation platform in Kraków. Collaborate with multiple teams to build autonomous workflows and refine user interactions.

Responsibilities

• Designing and building production-grade AI agents and autonomous marketing workflows across the ActiveCampaign platform
• Implementing multi-step agentic flows involving LLM orchestration, tool use, and integration with platform services
• Working with LLM APIs (prompt engineering, response handling, evaluation) and building reliable, testable agent pipelines
• Designing and running agent evaluations — building eval frameworks, defining quality metrics, and continuously measuring agent accuracy, reliability, and performance in production at scale
• Monitoring and optimizing agent performance — latency, cost, token usage, error rates — and iterating rapidly based on production data
• Iterating on agent behavior based on user feedback, observability data, and quality metrics
• Leveraging AI-assisted development tools and practices in your daily workflow — you don't just build AI features, you build with AI
• Writing production-quality code in Python for agent services and backend orchestration
• Contributing to PHP backend and frontend (React/Ember) integration points where agents interact with the core platform
• Building and maintaining APIs, data flows, and service interfaces that agents depend on
• Working iteratively — shipping code fast, learning from production, and improving continuously
• Ensuring code quality through testing, code review, and adherence to engineering standards
• Participating in on-call rotation for incidents related to agent services
• Working closely with Product, Design, and domain engineering teams to define agent capabilities and user experiences
• Engaging in pairing and code reviews across teams
• Contributing to documentation of agent architectures, patterns, and best practices
• Maintaining regular overlap with US-based teams (Chicago timezone) to ensure alignment and tight collaboration across the organization

Requirements

• 2-4 years of experience in a software engineering role
• Hands-on experience building and running AI agents or agentic workflows in a production environment — not just prototypes or side projects
• Experience with agent evaluation and performance optimization — you know how to measure whether an agent is working well and how to make it better
• Solid backend development skills in Python; working familiarity with PHP is a plus
• Understanding of how to build reliable, testable, and observable systems
• Active practitioner of AI-driven development — you use AI coding assistants and agentic development tools as part of how you work, not just what you build
• Ability to work iteratively and ship code fast — you're comfortable with rapid release cycles and learning from production
• Familiarity with DB technologies: MySQL, DynamoDB, Redis
• Strong problem-solving skills and ability to work across multiple codebases and technologies
• Fluent in English (B2 minimum)
• Willingness to work flexible hours with regular afternoon availability to overlap with US Central timezone
• Experience with agentic AI frameworks or multi-agent orchestration patterns
• Familiarity with Model Context Protocol (MCP) or tool-use patterns for LLM agents
• Experience building eval pipelines or quality measurement systems for LLM-based features
• Frontend experience with React or Ember
• Familiarity with AWS, CI/CD practices, and observability tooling
• Understanding of prompt engineering, evaluation methodologies, or LLM fine-tuning
• Experience in SaaS, marketing automation, or CRM domain

Benefits

• Comprehensive Health & Wellness: Top-tier benefits package that includes medical and dental benefits paid 100% by ActiveCampaign for you and 50% for your dependents, and reimbursements on vision expenses.
• Growth & Development: Access to LinkedIn Learning, professional development programs, and career growth opportunities in a fast-growing organization.
• Generous Paid Time Off: Recharge and take the time you need to maintain work-life balance.
• Total Rewards: Pension scheme with matching up to 1.5% of your contribution, MultiSport Plus card to support your active lifestyle, home office stipend to cover your commuter or work from home expenses, and a four-week paid sabbatical with bonus after five years.
• Collaborative Culture: Work alongside brilliant, passionate colleagues in an environment that values innovation, teamwork, and mutual support.