Senior Software Engineer

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. This role has a strong emphasis on spec‐driven AI‐assisted development, where engineers leverage clear technical specifications and modern AI coding tools such as Cursor, Claude Code, and Kiro to accelerate development while maintaining high engineering rigor and production quality. Join us and do some truly astounding things.

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.

What you’ll bring with you:

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

Demonstrated technical leadership (mentoring junior engineers, raising code quality via reviews, and ensuring implementations meet specifications and standards)

Experience working in Agile / Scrum teams.

Why you might stand out from other talent:

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

Cloud platforms ( AWS / Azure / GCP ) and DevOps practices

CI/CD pipelines, Docker, Kubernetes

Observability, monitoring, and performance tuning experience

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

When you join Epsilon, we’ll create something EPIC together. We’re a global leader in data and identity, with deep expertise in digital media, clean rooms, customer data platforms, loyalty and marketing services. Positioned at the center of Publicis Groupe, Epsilon helps brands deliver personalized experiences at scale and build lasting customer relationships by unlocking the full potential of data and identity. Epsilon operates in 30+ countries across EMEA, the Americas and APAC, with more than 8,000 employees.

Check out a few of these resources to learn more about what makes Epsilon so EPIC:

Our Culture: https://www.epsilon.com/us/about-us/our-culture-epsilon

Life at Epsilon: https://www.epsilon.com/us/about-us/epic-blog

Epsilon has five values that define our culture and guide us as we create value for our clients, our people and consumers. We seek candidates who align with our company values, demonstrate them and make them meaningful in their day-to-day work:

Act with integrity. We are transparent and have the courage to do the right thing.

Work together to win together. We believe collaboration is the catalyst that unlocks our full potential.

Innovate with purpose. We shape the market with big ideas that drive big outcomes.

Respect all voices. We embrace differences and foster a culture of connection and belonging.

Empower with accountability. We trust each other to own and deliver on common goals.

Because You Matter

As an Epsilon employee, you deserve perks and benefits that put you, your family and your finances first. Our benefits encompass a wide range of offerings, including but not limited to:

Time to recharge: Flexible time off (FTO), 14 paid holidays, 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

Epsilon benefits are subject to eligibility requirements and other terms.

Epsilon is an Equal Opportunity Employer. Epsilon’s policy is not to discriminate against any applicant or employee based on actual or perceived race, age, sex or gender (including pregnancy), marital status, national origin, ancestry, citizenship status, mental or physical disability, religion, creed, color, sexual orientation, gender identity or expression (including transgender status), veteran status, genetic information or any other characteristic protected by applicable federal, state or local law. Epsilon also prohibits harassment of applicants and employees based on any of these protected categories. Epsilon will provide accommodations to applicants who need accommodations to complete the application process. Please reach out to LeaveofAbsence@epsilon.com to request an accommodation.

For San Francisco Bay and Los Angeles Areas: Epsilon will consider qualified applicants with criminal histories for employment in a manner consistent with the City of Los Angeles’ Fair Chance Initiative for Hiring Ordinance and San Francisco Police Code Sections 4901-4919, commonly referred to as the San Francisco Fair Chance Ordinance. Applicants with criminal histories are welcome to apply.

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