Senior Software Engineer

Overview

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.

How You’ll Make an Impact

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.

What You’ll Achieve

• 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

Who You Are

• 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

Benefits and Compensation

• 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 per year. The Company reserves the right to modify this pay range at any time.

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 needing accommodations to complete the application process. Please reach out to to request an accommodation.

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