Principal Engineer/Engineering Manager

Principal Engineer/Engineering Manager

We are seeking a Principal Engineer/Engineering Manager to lead one of the core engineering teams within Planning Agent, our AI-powered advertising planning platform used daily by Omnicom agency teams. You will help shape and grow a product with AI at its core, using agents to power an AI assistant advertising planners throughout their workflow.

You’ll lead a cross-functional team of 8–10 remote engineers and data scientists, distributed across multiple countries in Europe, with a significant presence in Poland and Ukraine. Our tech stack includes Python with a React frontend, deployed on AWS in Kubernetes clusters, using GCP for Gemini and LangGraph for agent orchestration. While you’ll have the resources of a large organisation, this team operates with a startup mentality: embracing rapid iteration, a cross-functional mindset, and end-to-end ownership of features.

The role can be tailored to your strengths, whether as an Individual Contributor, a Manager, or a mix of both. You’ll lead system design, make architecture decisions, and guide technical direction while balancing hands-on implementation with enabling the team to deliver effectively. Depending on your focus, you may spend more time coding and implementing complex features, or more time on coaching, mentoring, and driving delivery. In all cases, you’ll conduct code reviews, contribute to high-impact features, and foster a high-performance engineering culture.

This position reports to the VP, Software Engineering, Planning. It will be primarily remote, though you are also welcome to work in our London office.

Key responsibilities

• Shape the architecture and engineering design of the product and its interactions with other applications and services
• Lead by example in technical delivery and engineering best practices
• Work with the Product team and other Tech Leads to execute the roadmap and translate requirements into actionable engineering tasks
• Discuss technical solutions with the development team, communicate goals, and facilitate execution
• Develop and expand product capabilities, from AI-driven features to core full-stack enhancements
• Lead functional design and code reviews, providing constructive feedback
• Coordinate with QA to achieve automated testing in support of continuous delivery
• Build and maintain a high-performance team and an innovative culture
• Provide coaching, mentoring, and career development to team members
• Have a results-driven personality, high enthusiasm, energy, and confidence

Minimal requirements

• Proven experience as a senior technical leader in an Agile/Scrum environment
• Strong knowledge of Python and microservice architectures
• Experience building web applications, preferably including React
• Familiar with software development methodologies, scaled system design, and best practices
• Knowledge of AWS and cloud-native architectures; familiarity with LangGraph a plus
• Strong communication skills, able to explain technical problems clearly to varied audiences
• Excellent organisational and technical writing skills
• Experience working with remote and geographically distributed teams a plus
• Background in advertising/marketing tech a plus

To apply, contact recruiter Joanna Samborska at [contact hidden]