Senior Software Engineer

Overview

How You’ll Make an Impact
A subsidiary of Publicis Groupe, Epsilon is a leading provider of multi-channel marketing services, technologies, and database solutions. At Epsilon, we do more than collect and store data. We help some of the world’s biggest brands discover real opportunities inside the data types, delimiters and decimals. We are looking for a highly experienced Senior Software Engineer (7–10 years) to design, build, and scale robust backend systems using Java and Python in an Agile environment.

Responsibilities

• Design, develop, and maintain scalable backend services using Java and Python
• Apply spec-driven AI-assisted development as a core development practice, including:
• Translating detailed functional and technical specifications into high-quality code using AI tools
• AI-assisted code generation, refactoring, and optimization with strong human validation
• Prompt-driven development aligned to explicit design and acceptance criteria
• Intelligent debugging, test generation, and code reviews using tools like Cursor, Claude Code, and Kiro
• Build and integrate RAG-based solutions and Agentic AI workflows into enterprise systems
• Lead system design and architecture discussions
• Ensure high code quality through reviews, testing, and engineering best practices
• Collaborate with product, data, platform, and cross-functional teams
• Own and resolve complex production issues

Qualifications

• Bachelor’s or Master’s degree in Computer Science, Engineering, or a related field (or equivalent practical experience)
• 7–10 years of hands-on software development experience
• Strong expertise in Java and Python
• Strong backend engineering experience with Java (e.g., Spring or similar frameworks) and production-grade service development
• Experience with common Java build and delivery tooling (e.g., Maven / Gradle) and source control workflows (e.g., Git, pull requests)
• Strong Data Modeling skills and experience with relational and NOSQL databases
• Experienced working in Unix/Linux environments, including automation and scripting
• Mandatory experience with spec-driven AI-assisted development
• Practical, day-to-day usage of AI coding tools such as Cursor, Claude Code, and similar platforms
• Ability to validate, refine, and productionize AI-generated code against explicit specifications
• Mandatory hands-on experience with:
• RAG (Retrieval-Augmented Generation) architectures
• Agentic AI systems (tool-using agents, orchestration, multi-step reasoning workflows)
• Strong fundamentals in:
• Data Structures & Algorithms
• Object-Oriented Programming
• Design Patterns and System Design
• Experience building and operating backend systems in production
• Solid understanding of REST APIs, microservices, and distributed systems
• Proven ability to own problems end-to-end, including driving design, implementation, testing, and production support
• Experience working in Agile / Scrum teams

Why You Might Stand Out

• Frontend exposure using Angular or similar frameworks
• Experience with Databricks, Spark, or large-scale data processing
• Experience with data modeling, data warehousing, and/or building ETL pipelines
• Experience with cloud platforms (AWS / Azure / GCP) and DevOps practices
• Experience with CI/CD pipelines, Docker, Kubernetes
• Experience with observability, monitoring, and performance tuning

Additional Information

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. 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.

Benefits

• Time to Recharge: Flexible time off (FTO), 15 paid holidays
• Time to Recover: Paid sick time
• Family Well-Being: Parental/new child leave, childcare & elder care assistance, adoption assistance
• Extra Perks: Comprehensive health coverage, 401(k), tuition assistance, commuter benefits, professional development, employee recognition, charitable donation matching, health coaching and counseling

Compensation Range

USD $88,900.00 - USD $165,100.00/Annually