Senior Software Engineer

Overview About Business Unit: The Product team forms the crux of our powerful platforms and helps connect millions of customers worldwide with the brands that matter most to them. This team of innovative problem solvers develops and builds products that position Epsilon as a differentiator, encouraging an open and balanced marketplace built on respect for individuals, where every brand interaction holds value. Our full-cycle product engineering and data teams chart the future and set new benchmarks for our products, by using industry standard methodologies and sophisticated capabilities in data, machine learning, and artificial intelligence. Driven by a passion for delivering smart end-to-end solutions, this team plays a key role in Epsilon’s success story. 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 use 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. Click here to view how Epsilon transforms marketing with 1 View, 1 Vision and 1 Voice. 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 protocols Collaborate with product, data, platform, and multi-functional teams Own and resolve complex production issues Qualifications 7–10 years of hands‑on software development experience Strong expertise in Java and Python 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 Experience working in Agile / Scrum teams Good to Have Frontend exposure using Angular or similar frameworks Experience with Databricks, Spark, or large‑scale data processing Cloud platforms (AWS / Azure / GCP) and DevOps practices CI/CD pipelines, Docker, Kubernetes Observability, monitoring, and performance tuning experience Education Bachelor’s or Master’s degree in Computer Science, Engineering, or a related field (or equivalent practical experience) Additional Information 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. Our values guide us to create value for our clients, our people and consumers. Act with integrity Work together to win together Innovate with purpose Respect all voices Empower with accountability These pillars and values are our foundation—shaping our culture, guiding our decisions, and uniting us in common purpose. Epsilon is an Equal Opportunity Employer. Epsilon is committed to promoting diversity, inclusion, and equal employment opportunities by using reasonable efforts to attract, recruit, engage and retain qualified individuals of all ethnicities and backgrounds, including, but not limited to, women, people of color, LGBTQ individuals, people with disabilities and any other underrepresented groups, traits or characteristics.