Senior Software Engineer
Company: Epsilon Strategy & Insights
Location: Schiller Park
Posted on: January 2, 2026
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Job Description:
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. 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, 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. 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, Tinley Park , Senior Software Engineer, IT / Software / Systems , Schiller Park, Illinois
