Principal Software Engineer

Principal Engineer, AI/ML & CloudCompany description A division of Publicis Groupe, Publicis Digital Experience is a network of top-tier agencies designed to develop capabilities and solutions to enable growth and provide scaled access to the digital capabilities of Publicis Groupe in service of our clients. Together, the Publicis Digital Experience portfolio endeavors to create value at the intersection of technology and experiences to connect brands and people. Our model to transform every brand experience will help clients navigate, develop, and activate commerce in a way that will provide them with a future-proof model for modern marketing. With our unique expertise in consumer engagement, CRM, and commerce, Publicis Digital Experience powers brands and empowers people in a new era of creativity.Overview Principal Engineer, AI/ML & Cloud, to serve as the top individual-contributor technical authority for our customer-facing AI capabilities and the cloud platform that powers them. This is a strategy-and-architecture role: you will define the reference architecture for Generative and Agentic AI on the platform, establish the engineering standards other teams build against, and personally deliver the hardest, highest-leverage pieces of the system. You will operate as a force multiplier across the AI/data science and platform engineering teams — shaping direction through architecture, design reviews, and hands-on mentorship rather than through people management.The ideal candidate brings 13+ years of experience in Data Engineering and ML (including large-scale distributed systems and architecture), 3+ years of hands-on experience with Generative/Agentic AI in production, and a track record of designing and deploying production-grade AI solutions across a hybrid estate — on-prem (Oracle) and AWS Cloud. You set technical vision, make the build/buy and platform decisions that others depend on, and are trusted to be right on the questions that matter most.Responsibilities The position's purpose includes, but is not limited to:Own the end-to-end technical architecture for the AI platform — from data foundations through model serving, retrieval, and agent orchestration — and drive it from vision to production.Define reference architectures, engineering standards, and paved-path patterns that AI and platform teams build against.Make and document the high-stakes build/buy, model-selection, and platform decisions (frameworks, vector stores, inference strategy, cloud services), informing senior leadership of alternatives and trade-offs.Lead the analysis and design of net-new and enhanced AI capabilities for the marketing platform as per business strategy and requirements.Set the standard for the development environment, tooling, and AI-assisted engineering workflow across teams.Partner with QA, product, data science and production support to bring new or enhanced AI features to market and resolve the most complex issues.Establish monitoring, evaluation, cost-governance and reliability practices for production AI systems.Guide and de-risk platform, security, and version/patch upgrade strategy for the AI and cloud estate.Qualifications Skill Summary Experience & leadership 13+ years of experience across ML engineering, data engineering, and large-scale distributed systems, including deep architecture experience. 3+ years of hands-on experience designing and shipping Generative/Agentic AI systems in production. Demonstrated ability to operate as a Principal-level individual contributor — setting technical direction, owning architecture, and influencing multiple teams without direct people-management authority. Track record of being the technical decision-maker on high-stakes platform and AI initiatives. Generative & Agentic AI Hands-on experience building and deploying production AI applications using LLMs at scale. Deep experience with RAG architectures, vector databases, embeddings, and retrieval systems in production — including chunking, indexing, and retrieval-quality optimization. Experience designing agentic AI systems — tool-using agents, orchestration, and multi-step reasoning workflows — with appropriate guardrails and evaluation. Expertise in optimizing LLM usage across a platform: model selection, prompt engineering, context strategy, fine-tuning where warranted, and inference/deployment optimization for cost and latency. Ability to establish LLMOps/MLOps practice: monitoring, observability, and evaluation frameworks for AI systems — performance, cost management, and output-quality/guardrail metrics. Active, expert use of AI coding assistants (Cursor, Claude Code, GitHub Copilot) and spec-driven AI-assisted development in daily workflow, and ability to set that standard for others. Data & platform engineering Strong data engineering skills: pipeline design, data transformation, and working with large-scale datasets that feed AI systems — integrating with existing infrastructure while building new pipelines where needed. Depth with distributed data processing (Spark/PySpark, Databricks, Hadoop/Hive) and workflow orchestration (Airflow); experience with MLflow or equivalent for the ML lifecycle. Ability to design and deploy RAG systems, embeddings pipelines, and LLM-powered features on native Python infrastructure and/or Scikit-learn, XGBoost, PyTorch, TensorFlow, and FastAPI. Ability to define and lead migration strategies from legacy systems to modern AI and cloud architecture. Cloud & software engineering Hands-on experience designing and deploying production-grade solutions on AWS — including compute and data services (e.g., EC2, S3, EMR, Glue, Lambda, Redshift) — as well as on-prem (Oracle) in a hybrid estate. Experience with Infrastructure-as-Code (Terraform/CloudFormation), containers and orchestration (Docker, Kubernetes), and secure, multi-account cloud design (IAM, network, and security boundaries). Strong software engineering fundamentals: version control, testing, CI/CD, and code review — and the ability to set these standards for teams. Proficiency in Python and in Linux/Shell/bash scripting to automate processes. Strong understanding of Disaster Recovery and Business Continuity solutions, performance tuning, and application monitoring/support of production applications with distributed teams. Experience with scheduling applications with complex interdependencies, and with reporting/report development on any reporting tool.Ways of working Ability to work independently and set direction while integrating with, and elevating, a team. Proven analytical and problem-solving abilities, with the ability to anticipate and avoid problems before they occur. Experience mentoring and technically guiding senior engineers; comfortable being the person others escalate the hardest problems to. Excellent experience working with geographically and culturally diverse teams. Ability to write detailed technical specifications for developers, and to design, validate and oversee software test strategy. Deep familiarity with the full Application Development Life Cycle, able to independently lead each phase. Education Bachelor's degree in Computer Science or equivalent; advanced degree or equivalent depth of experience preferred.Preferred Knowledge Areas Technical Prior experience in automotive marketing and/or CRM applications strongly preferred. Experience with ETL tooling (e.g., Informatica or equivalent). Proven ability to define solution architecture and set direction across teams. Awareness of Dimensional, Fact, and Data modelling with Cube design and deployment experience related to Data Warehouse. Familiarity with complex data lake environments spanning OLTP, MPP and Hadoop platforms. Excellence in impact analysis and root cause analysis. Ability to design and build flexible, extensible systems with a focus on reuse, generation, and paved-path patterns for other teams. Awareness of responsible-AI, data privacy, and model-governance considerations for customer-facing systems. Ability to work within tight deadlines and to prioritize and execute effectively in a high-pressure environment. Strong communication skills (verbal and written), including communicating technical strategy to non-technical audiences and all levels of management. Non-Technical Strong analytical and problem-solving skills. Ability to diagnose and troubleshoot problems quickly to maintain operational stability. Motivated to learn new applications and domains, with an appetite for learning through exploration and reverse engineering. Strong time-management skills and the ability to take full ownership of ambiguous, high-impact problems. Behavioral Attributes A technical leader who elevates the team — excellent interpersonal skills and a collaborative, low-ego approach. Good verbal and written communication. A can-do attitude and the resilience to lead through any kind of challenge.Additional information The Power of One starts with our people! To do powerful things, we offer powerful resources. Our best-in-class wellness and benefits offerings include: Monetary assistance and support for Adoption, Surrogacy and Fertility Monetary assistance and support for pet adoption Employee Assistance Programs and Health/Wellness/Comfort reimbursements to help you invest in your future and work/life balance Tuition Assistance Paid time off that includes Flexible Time off Vacation, Annual Sick Days, Volunteer Days, Holiday and Identity days, and more Matching Gifts programs Flexible working arrangements Work Your World' Program encouraging employees to work from anywhere Publicis Groupe has an office for up to 6 weeks a year (based upon eligibility) Business Resource Groups that support multiple affinities and alliances The benefits offerings listed are available to eligible U.S. Based employees, are reviewed on an annual basis, and are governed by the terms of the applicable plan documents. We also offer medical and voluntary benefits to our freelancers and temporary employees. Voluntary benefit options include supplemental medical insurance, transportation, and parking benefits, legal benefits, pet insurance, and auto and home insurance. You must be actively employed for 90 consecutive calendar days in order to be eligible for Publicis medical and voluntary benefits. You must be work authorized in the United States on a full-time basis without the need for employer sponsorship now or in the future. The Company cannot offer employment to F-1 (student)