Senior Full Stack Engineer
Company: Epsilon Strategy & Insights
Location: Schiller Park
Posted on: November 3, 2025
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Job Description:
Epsilon is building the next generation Retail Media Network
(RMN) platform to power onsite advertising at scale, leveraging
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. What You’ll Achieve • 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, troubleshoot 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 best
practices, and CI/CD automation. • Deliver mission-critical
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. Who You Are • What You’ll Bring
with you : o Bachelor’s degree in Computer Science or related field
(or equivalent experience). o 6 years of experience in backend
and/or full stack software development. o Strong backend expertise
in Java, with experience in high-performance, distributed systems.
o Experience with streaming platforms (e.g., Kafka, Kinesis,
Pulsar). o Proficiency with relational databases (SQL) and NoSQL
data stores. o Understanding of low-latency, high-throughput
architectures and clean software design principles. o Experience
building SPAs with TypeScript and modern frameworks (Angular,
React, or similar). • Why you might stand out from other talent : o
Master’s degree or 10 years software engineering experience. o
Experience in ad tech, especially ad serving, RTB, or programmatic
platforms. o Familiarity with cloud-native environments (AWS,
Kubernetes, Docker). o Experience with large-scale event tracking,
data pipelines.
Keywords: Epsilon Strategy & Insights, Chicago , Senior Full Stack Engineer, IT / Software / Systems , Schiller Park, Illinois
