Senior Data Scientist
ActiveCampaign
Data Science
Kraków, Poland
Posted on Jun 28, 2025
Join us in revolutionizing how small and medium businesses harness AI for marketing success. As a Senior Data Scientist, you'll help to architect the next generation of agentic AI systems that autonomously optimize marketing campaigns, making enterprise-level AI accessible to SMBs worldwide.
What You'll Build:
- Design and implement our foundational AI data platform, ensuring enterprise-grade scalability, reliability, and performance
- Build production-ready agentic systems that autonomously execute marketing strategies, from campaign optimization to audience targeting
- Create robust MLOps pipelines supporting model training, deployment, and continuous improvement at scale
- Prototype and deploy state-of-the-art machine learning models, specializing in agentic AI systems for marketing automation
- Advance our LLM capabilities through RAG implementations, fine-tuning strategies, RLHF, and comprehensive model evaluation frameworks
- Research and integrate emerging AI technologies, translating academic breakthroughs into practical business solutions
- Conduct deep statistical analysis to identify the patterns and metrics that drive successful marketing campaigns
- Build end-to-end data science products from proof-of-concept through production deployment
- Collaborate with product and engineering teams to integrate AI models into scalable, production-ready systems
What we're looking for:
- 7+ years of relevant experience
- Proven track record building and deploying sophisticated machine learning solutions, with experience in agentic systems, NLP, or deep learning
- Demonstrated success architecting scalable data pipelines and ML platforms that support high-volume model training and inference
- Strong proficiency in Python ecosystem (scikit-learn, TensorFlow, PyTorch, Hugging Face) for both research and production systems
- Hands-on experience with RAG architectures, model fine-tuning, RLHF, comprehensive evaluation frameworks, and drift detection systems
- Advanced SQL skills and expertise in data warehousing, ETL processes, and data governance best practices
- Understanding of database architectures and their trade-offs, plus experience with cloud platforms (AWS, GCP, Azure) and distributed computing (Spark, Dask)
- Ability to identify high-impact AI opportunities and translate them into technical solutions that drive business value
- Insatiable appetite for learning about cutting-edge AI research and its practical applications
- Strong bias toward reusable, scalable solutions that maximize impact
- Lives and breathes data, with natural instincts for uncovering meaningful patterns and relationships
Why this role matters:
- You'll be joining a small, high-impact team where your work directly empowers thousands of SMBs to compete with enterprise-level marketing sophistication. Our flat hierarchy means your ideas shape our product direction, and our focus on agentic AI puts you at the forefront of one of the most exciting areas in machine learning. This isn't just about building models—it's about democratizing AI and creating lasting impact for businesses that form the backbone of the world’s economy.
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 an AI-first, end-to-end 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 950+ 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 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.