Senior Backend Engineer

This is Us

Ingenious Lion is a Digital Tech Hub designed exclusively for Publicis Groupe, one of the world’s leading marketing agencies.

As the marketing industry continues to drive digital transformation, Publicis Groupe empowers its clients with innovative data solutions and media ecosystems. Ingenious Lion has one mission: to partner with Publicis’ global teams in creating innovative data and digital tech products that will shape the future.

What makes us successful? Two key ingredients: we seek the good and the best, meaning we cultivate a thriving company culture. We’re all about creating an environment where people don’t just work; they grow, challenge themselves, strive for excellence, and are recognized for their incredible value to the team.

If you're curious to learn more about us, here are four things you should know:

• Our company culture is anchored in five powerful values: Joy, Honesty, Connectivity, Own Challenger, and Greater World. Do these values resonate with you?

• We are committed to diversity and inclusion because we believe our unique differences make us stronger.

• We encourage open communication and create an environment where everyone’s voice is heard and every contribution is valued.

• Finally, we’re somewhat “obsessed” with quality. We believe in continuous learning and knowledge sharing; when we hit a roadblock, we don’t just complain—we create solutions to overcome it.

In one sentence, we are a group of people with an unusual aptitude for generating great ideas, groundbreaking concepts, and infusing them with positive energy and good fun.

Feeling Ingenious already?

A Sneak Peek at Your Future Role

As a Senior Backend Engineer, you will lead the design, development, and evolution of backend systems and data pipelines, write production-grade code and solve complex distributed systems problems. You will shape backend patterns and architecture across the platform, ensuring systems are scalable, reliable, secure, and performant.

You will work as an individual contributor with a high level of technical ownership, defining service architecture, enforcing engineering best practices, and guiding other engineers through technical influence rather than direct management.

Working closely with product and data teams, you will align architecture decisions across teams, contribute to shared backend designs, and ensure consistency and maintainability across the platform.

Here Are the Key Tasks You'll Be Working on Every Day

• Architect distributed backend services and APIs, defining patterns for microservices, caching, queuing, resiliency, and error handling.

• Design and maintain data pipelines following the medallion architecture, building and optimizing ETL/ELT workflows that ingest, transform, and serve data at scale.

• Write high-quality, production-ready code and integrate with external APIs, cloud services, and internal microservices.

• Implement secure authentication, authorization, rate limiting, and multi-tenant access controls across services.

• Build and maintain CI/CD pipelines and infrastructure-as-code environments, leading code reviews and ensuring high engineering standards.

• Implement tracing, structured logging, metrics, and alerting, optimizing services for latency, concurrency, and reliability.

• Mentor engineers, contribute to internal libraries and backend frameworks, and drive consistency across the platform.

We're Thrilled to Have You Consider Joining Our Team. Here Are the Qualifications We're Seeking

• At least five years of backend engineering experience with architectural ownership over services or distributed systems.

• Expertise in Python, FastAPI, and Flask with modern backend development patterns.

• Strong understanding of microservices, concurrency, async programming, and event-driven architectures.

• Proficiency with SQL and NoSQL databases such as PostgreSQL, DynamoDB, Redis, or MongoDB.

• Experience with PySpark and Databricks, including the medallion architecture.

• Hands-on experience with Docker, Kubernetes, and cloud platforms such as AWS or GCP.

• Strong CI/CD experience and deep knowledge of observability practices, including logs, metrics, and traces.

• Fluent in English, both verbal and written.

Skills That Would Make You Shine Even Brighter!

• You know about streaming or queuing systems such as Kafka, Pub/Sub, or SQS.

• You are familiar with AI and LLM systems, including agentic workflow integration.

• You have experience with Delta Lake, Unity Catalog, or other Lakehouse governance tools.

• You have prior experience in media, advertising, or AdTech environments.