Lead Engineer, Full Stack (US)

Code and Theory is seeking a full-stack lead engineer to help build The Machine, our agentic operating system for marketing. This is a senior, hands-on role, setting technical direction, developing the team, and staying in the code building, the AI-native digital platforms, and user experiences that power enterprise marketing workflows. The engineer will work closely with Engineering, Product, and Design to build performant, scalable applications across web and AI-enabled systems, leading through the work itself, coordinating across functions, and gathering the information that shapes roadmaps and priorities.

The Machine is the agentic operating system for marketing, built by Code and Theory. It plugs into the tools marketing teams use and turns disconnected workflows into a single intelligent system, connecting brand strategy, creative production, and media performance. The Machine helps power agencies across Stagwell's network and world-leading brands.

WHAT YOU'LL DO

• Own the technical direction for features and systems across the full stack, setting standards for scalability, correctness, and maintainability that the team builds against

• Build and maintain modern front-end applications using React and Next.js, focusing on correctness, for long term maintainability, and integration with back-end services

• Own complex API integrations end to end, setting the contracts, validation standards, and reliability bar for how internal and external systems communicate

• Build maintainable and well-structured application logic

• Lead cross-disciplinary alignment on architecture, data flow, and technical trade-offs

• Lead technical discussions, architectural reviews, and problem-solving sessions, shaping how the team approaches hard engineering decisions

• Set the bar for code quality, and define and enforce standards for clean, maintainable, well-documented code across the team

• Mentor and develop engineers, actively growing junior talent through code review, knowledge-sharing, and modeling strong engineering practices

• Help define the vanguard for emerging technologies and frameworks, applying them to projects quickly and effectively to improve the health of our systems over time

WHAT YOU'LL NEED

• Ability to build independently to figure out how something works for the user

• Self-direction, curiosity, and comfort with ambiguity

• Bias toward action

• Experience in an IDE or harness of choice

• Backend in Python, Node.js, or Go

• Infrastructure and infrastructure as code (GCP, AWS, or Azure; Terraform, Pulumi, or similar; Kubernetes and networking principles)