About Business Unit:

The Product team forms the crux of our powerful platforms and helps connect millions of customers worldwide with the brands that matter most to them. This team of innovative problem solvers develops and builds products that position Epsilon as a differentiator, encouraging an open and balanced marketplace built on respect for individuals, where every brand interaction holds value. Our full-cycle product engineering and data teams chart the future and set new benchmarks for our products, by using industry standard methodologies and sophisticated capabilities in data, machine learning, and artificial intelligence. Driven by a passion for delivering smart end-to-end solutions, this team plays a key role in Epsilon’s success story.

About the Role:

We are looking for a Senior Software Engineer (Full Stack) to help design and build scalable, high-performance platforms that power data-driven marketing and advertising use cases. This is a high-impact role for an engineer who thrives with ownership, understands system-level thinking, and enjoys working across frontend, backend, and data layers.

You will contribute to architecture and implementation, optimize performance and reliability, and collaborate closely with product, design, and platform teams to deliver robust solutions used at scale.

Click here to view how Epsilon transforms marketing with 1 View, 1 Vision and 1 Voice.

How You’ll Make an Impact

• Design, implement, and operate scalable, high-throughput web applications and services
• Build and evolve backend services, APIs, and data integrations supporting data-intensive workflows
• Develop modern, performant user interfaces and internal tools when needed
• Collaborate with product and design teams to translate business requirements into technical solutions
• Optimize performance, troubleshoot production issues, and eliminate bottlenecks across the stack
• Champion clean code, testing best practices, and CI/CD automation
• Contribute to system observability, monitoring, and reliability improvements
• Mentor junior engineers and actively participate in design and code reviews

What You’ll Achieve

• Deliver reliable, scalable features that support mission-critical marketing and analytics workflows
• Build services and interfaces that enable rapid iteration and future platform growth
• Improve system performance, stability, and developer productivity
• Raise engineering standards through thoughtful design and execution

• Strong experience with frontend frameworks (React, Next.js, Angular)
• Strong experience with backend development (Java/Spring Boot, Node.js, or Python)
• Hands-on experience with SQL and NoSQL databases (MySQL, PostgreSQL, BigQuery, etc.)
• Experience building and consuming RESTful APIs (gRPC is a plus)
• Exposure to Docker and Kubernetes in production environments
• Experience working with cloud platforms (AWS or GCP)
• Proficiency with Git and CI/CD tools (Jenkins, GitHub Actions)
• Strong problem-solving, debugging, and system design skills

Nice to Have

• Experience in ad-tech, retail media, or data-heavy platforms
• Experience with event-driven or streaming systems (Kafka, Pub/Sub, etc.)
• Experience with GraphQL in addition to REST
• Knowledge of authentication and authorization (OAuth 2.0, JWT, SAML)
• AWS or GCP certifications

Epsilon is a global data, technology and services company that powers the marketing and advertising ecosystem. For decades, we’ve provided marketers from the world’s leading brands the data, technology and services they need to engage consumers with 1 View, 1 Vision and 1 Voice. 1 View of their universe of potential buyers. 1 Vision for engaging each individual. And 1 Voice to harmonize engagement across paid, owned and earned channels.

Epsilon’s comprehensive portfolio of capabilities across our suite of digital media, messaging and loyalty solutions bridge the divide between marketing and advertising technology. We process 400+ billion consumer actions each day using advanced AI and hold many patents of proprietary technology, including real-time modeling languages and consumer privacy advancements. Thanks to the work of every employee, Epsilon has been consistently recognized as industry-leading by Forrester, Adweek and the MRC. Epsilon is a global company with more than 9,000 employees around the world.

Our pillars aren't just words. They're how we show up every day.

• People centricity: We focus on employee well-being in an environment where colleagues truly care about each other.
• Collaboration: We work together, support one another, and collectively achieve goals.
• Growth: There are endless opportunities for growth through learning, development and career advancement.
• Innovation: We drive progress through cutting-edge solutions and forward-thinking approaches.
• Flexibility: We’ve created a balance between work and personal life, and we encourage adaptability to solve problems creatively.

Our values guide us to create value for our clients, our people and consumers.

• Act with integrity
• Work together to win together
• Innovate with purpose
• Respect all voices
• Empower with accountability

These pillars and values are our foundation—shaping our culture, guiding our decisions, and uniting us in common purpose.

Epsilon is an Equal Opportunity Employer. 
Epsilon is committed to promoting diversity, inclusion, and equal employment opportunities by using reasonable efforts to attract, recruit, engage and retain qualified individuals of all ethnicities and backgrounds, including, but not limited to, women, people of color, LGBTQ individuals, people with disabilities and any other underrepresented groups, traits or characteristics.