Staff Software Engineer

EuroPython; Kraków; Hybrid; PLN 369,000 - 451,000; Full time

Job summary

ActiveCampaign seeks a Staff Software Engineer to anchor our Kraków hub, driving technical direction and AI-driven platform improvements. You will architect scalable agentic features, optimize system performance, and champion modern engineering practices across multiple teams.

You will mentor engineers and collaborate with leadership on architecture and roadmaps. The ideal candidate has 8+ years in multi-stack SaaS environments, strong PHP and React/Ember skills, AI experience, and English

Qualifications

• 8+ years hands-on software engineering across multiple product areas.
• Proven PHP, React/Ember and AI integration experience.
• Experience with AWS, CI/CD and observability at scale.
• Fluent English (B2) and cross-timezone collaboration.
• Knowledge of AI standards or tooling is a plus.

Responsibilities

• Set technical direction across Kraków Hub teams and act as advisor or embed into squads.
• Architect scalable AI features with reliable, maintainable architectures.
• Identify and resolve platform bottlenecks with a whole-system view.
• Champion AI-assisted engineering practices and tooling adoption.
• Mentor engineers and foster high-ownership culture.
• Bridge strategy and execution with clear architectural documentation.

Skills

8+ years exp

PHP & React/Ember

AI & Agentic Dev

SaaS experience

AWS & CI/CD

English fluency

Tools

MySQL

DynamoDB

Redis

Python

AWS

Job description

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.

Compensation: zł 369,000 - 451,000 (per year salary)

Compensation details listed in this posting reflect the base rate only and do not include bonus, equity, sales incentives or other role specific compensation that the role may be eligible for. ActiveCampaign believes in and is committed to equitable compensation practices. The salary range provided above is a good faith estimate of the pay range determined by the location associated with the job posting. The actual salary depends on a candidate’s skills, experience, and work location.

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.