Staff Software Engineer

As our next Staff Software Engineer, you won’t just be writing code—you’ll be the high-impact catalyst at the heart of our Kraków Hub, forcing clarity and raising the bar for engineering excellence across the entire ActiveCampaign platform. You will sit at the epicenter of our AI-first transformation, architecting agentic workflows that redefine marketing automation while simultaneously pioneering AI-assisted development practices that accelerate every team around you. This isn’t a role for someone who waits for a roadmap; it’s for a technical visionary who takes extreme ownership of the platform’s performance, scalability, and future trajectory. Whether you are embedding in a squad to unblock a complex AI integration or advising leadership on cross-cutting architectural debt, your influence will be the force multiplier that ensures our Kraków Hub remains a powerhouse of innovation. This is your opportunity to shape the direction of a world-class SaaS platform and see your contributions directly impact the way millions of users engage with intelligent automation

On a typical day, you might:

• Drive technical direction across multiple Kraków Hub teams, acting as a strategic advisor or embedding directly into squads when technical complexity demands a master-level touch.
• Architect scalable agentic AI features, ensuring autonomous workflows and LLM integrations across platform subsystems—from CRM to email automation—are reliable and maintainable at scale.
• Identify and resolve platform-wide bottlenecks with a whole-system perspective, optimizing everything from frontend rendering in React/Ember to deep backend logic in PHP and Python.
• Champion AI-assisted engineering practices, leading the evaluation and adoption of cutting-edge tools (like Copilot, Cursor, or Devin) to transform how our internal teams build and test software.
• Mentor and grow the next generation of talent, using pairing and code reviews to foster a culture of high ownership and technical rigor within the hub.
• Bridge the gap between strategy and execution, articulating the basis for technical decisions to both engineers and leadership to balance business speed with long-term architectural health.

The ideal candidate will bring:

• 8+ years of hands-on software engineering experience, with a demonstrated track record of delivering high-impact results across multiple product areas or complex SaaS systems.
• Multi-stack mastery with deep production experience in PHP and modern backend technologies, complemented by a strong competency in React or Ember.
• Proven expertise in AI and Agentic development, including real-world experience designing autonomous agents, multi-agent orchestration, or deep LLM integrations.
• The ability to act as a technical advisor, earning trust across the organization through sound judgment, clear architectural documentation, and a "whole-system" ownership mindset.
• Experience in high-growth SaaS environments, ideally within the marketing automation or CRM domain, with a solid understanding of AWS, CI/CD, and observability at scale.
• A working knowledge of Python for AI services and experience with data stores like MySQL, DynamoDB, or Redis at scale.
• Fluency in English (B2 minimum) and the flexibility to collaborate effectively across time zones, specifically overlapping with US Central time.
• Familiarity with emerging AI standards, such as the Model Context Protocol (MCP) or advanced AI coding assistants.

About ActiveCampaign: ActiveCampaign is the autonomous marketing platform that gives growing businesses the intelligence to market like a much larger team. Powered by Active Intelligence, ActiveCampaign turns each business’ own data into campaigns, automations, and customer experiences that get smarter over time. Learn more at activecampaign.com. As a global multicultural company, we are proud of our inclusive culture which embraces diverse voices, backgrounds, and perspectives. We don’t just celebrate our differences, we believe our diversity is what empowers our innovation and success. You can find out more about our DEI initiatives here. Perks and Benefits: At ActiveCampaign, we prioritize employees’ well-being and professional growth by cultivating a culture centered on collaboration and innovation. When you join our team, you’ll not only have the opportunity to make a significant impact, but also enjoy a range of benefits tailored to support your personal and career development. Here are some of the benefits we offer: -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. In addition, employees receive complimentary access to telehealth services, and a free subscription to Calm. -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. ActiveCampaign is an equal opportunity employer. We recruit, hire, pay, grow, and promote no matter of gender, race, ethnicity, sexual orientation, marital status, political opinion, national origin, social origin, parentage, workers union membership, economic status, religion, age, health condition, disability or any other grounds protected by law. Our Employee Resource Groups (ERGs) strive to foster a diverse inclusive environment by supporting each other, building a strong sense of belonging, and creating opportunities for mentorship and professional growth for their members.