Senior Software Engineer

Epsilon is building the next generation Retail Media Network (RMN) platform to power onsite advertising at scale, using services from our industry-leading platform that already serves billions of offsite ads across the open web. Our vision is a unified platform for both onsite and offsite ads, delivering low-latency, high-throughput performance across the board. We’re looking for a Senior Software Engineer to join our Core Platform Engineering team, someone with a self-starter mindset who thrives with minimal direction, can quickly grasp business and technical goals, and takes ownership from concept through delivery.

This is a high-impact role where you’ll shape the architecture, optimize performance, and ensure our systems are built for scale, reliability, and innovation.

You’ll be at the forefront of building a next-generation advertising platform that combines the speed and sophistication of programmatic ad serving with the personalization and commerce power of retail media. Your work will directly shape how millions of users experience advertising across top retailers and brands.

• Design, implement, and maintain high-performance, low-latency services for advertising.
• Collaborate with product, platform, and operations teams to integrate new capabilities into the platform.
• Optimize system performance, fix production issues, and eliminate bottlenecks across the stack.
• Contribute to frontend integrations (SPAs, dashboards, tools) when needed, ensuring seamless workflows for internal and external users.
• Partner with data engineering teams to design and integrate event tracking, analytics, and reporting pipelines.
• Champion code quality, testing standard processes, and CI/CD automation.
• Deliver critically important enhancements enabling fast, accurate, and scalable ad delivery.
• Build robust, future-proof services and interfaces that empower rapid feature development.
• Improve system observability, monitoring, and fault tolerance.

• What You’ll Bring with you :
  • Bachelor’s degree in Computer Science or related field (or equivalent experience).
  • 6+ years of experience in backend and/or full stack software development.
  • Strong backend expertise in Java, with experience in high-performance, distributed systems.
  • Experience with streaming platforms (e.g., Kafka, Kinesis, Pulsar).
  • Proficiency with relational databases (SQL) and No
    
    SQL data stores.
  • Understanding of low-latency, high-throughput architectures and clean software design principles.
  • Experience building SPAs with Type Script and modern frameworks (Angular, React, or similar).
• Why you might stand out from other talent :
  • Master’s degree or 10+ years software engineering experience.
  • Experience in ad tech, especially ad serving, RTB, or programmatic platforms.
  • Familiarity with cloud-native environments (AWS, Kubernetes, Docker).
  • Experience with large-scale event tracking, data pipelines.

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

Base Salary: $80,250 - $133,750

Actual compensation within the range will be dependent upon, but not limited to the individual’s skills, experience, qualifications, location and application employment laws. The salary pay range is subject to change and may be modified at any time.

When You Join Us, We’ll Create Something EPIC Together 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.…