Principal AI Engineer

Join us in revolutionizing how small and medium businesses harness AI for marketing success. As the Principal AI Engineer, you'll architect the next generation of agentic AI systems that autonomously optimize marketing campaigns, making enterprise-level AI accessible to SMBs worldwide. You will lead the charge in translating our ambitious vision into tangible, impactful AI products, guiding a team of talented data scientists and product managers to achieve our strategic objectives.

• Strategically define and implement our foundational AI data platform, ensuring enterprise-grade scalability, reliability, and performance.
• Drive the development and deployment of production-ready agentic systems that autonomously execute marketing strategies.
• Architect and oversee the creation of robust MLOps pipelines supporting model training, deployment, and continuous improvement.
• Prototype and deploy state-of-the-art machine learning models, specializing in agentic AI systems.
• Advance our LLM capabilities through innovative RAG implementations, fine-tuning strategies, RLHF, and comprehensive model evaluation frameworks.
• Lead the research and integration of 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.
• Own the development of end-to-end data science products from proof-of-concept through production deployment.
• Develop quantitative impact metrics and compelling visualizations that demonstrate clear ROI for SMB clients.
• Champion collaboration with product, engineering and cross-functional organizations, ensuring seamless integration of AI models.

• 12+ years of experience building and deploying sophisticated machine learning solutions, with deep 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.
• Expert-level 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.
• Deep understanding of database architectures and their trade-offs, plus experience with cloud platforms (AWS, GCP, Azure) and distributed computing (Spark, Dask).
• Exceptional ability to identify high-impact AI opportunities and translate them into technical solutions that drive significant business value.
• Outstanding skill in translating complex technical concepts into clear business strategies and actionable insights, influencing stakeholders and driving adoption of our AI solutions.
• Experience mentoring and developing junior data scientists in a collaborative, high-impact environment.
• Appreciation for the unique challenges SMBs face in adopting AI, with passion for democratizing access to advanced technology.

• 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.

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. 

-Comprehensive health and wellness benefits that includes a High Deductible Health Plan (HDHP) fully covered by ActiveCampaign, complimentary access to telehealth and tele-mental health resources, and a complimentary membership to Calm

-Open paid time off

-Generous 401(k) matching program with immediate vesting

-Quarterly Path Perks with options for commuter and lunch benefits (for those reporting to a Hub), or a remote home office stipend

-Access to professional development resources through LinkedIn Learning

-After five years of service, you’ll be eligible for a four-week paid sabbatical leave and a sabbatical leave bonus

ActiveCampaign is an equal opportunity employer. We recruit, hire, pay, grow and promote no matter of gender, race, color, sexual orientation, religion, age, protected veteran status, physical and mental abilities, or any other identities 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.