Senior Software Engineer

Overview About Business Unit: Platform Services specializes in the implementation, management and evolution of Custom and PeopleCloud solutions, offering end-to-end support for clients. Our team of experts handles platform setup, ongoing management, and strategic enhancements, ensuring that our solutions adapt to changing business needs. From loyalty programs to digital activation, our platforms empower clients to implement campaigns, generate insights, and streamline business activities, all with a focus on seamless integration and continuous improvement. By collaborating with client partners and strategy teams, we create impactful campaigns tailored to each client’s unique objectives. Click here to view how Epsilon transforms marketing with 1 View, 1 Vision and 1 Voice. Responsibilities What You Will Do You will combine strong software engineering fundamentals with AI-assisted ways of working and the ability to contribute across the end-to-end solution lifecycle. Your primary accountability remains engineering delivery, expected to flex into adjacent responsibilities (business analysis, quality engineering, data, and automation) as business and delivery needs evolve. Software Engineering & Platform Development Design, build, test, debug, deploy, and maintain web, API, integration, batch, and data-enabled applications using C#, .NET, JavaScript/TypeScript, and relevant modern frameworks. Develop responsive front-end experiences and reliable middleware and backend services using sound object-oriented, API, integration, and database design principles. Collaborate with architects and senior engineers to create modular, observable, resilient, secure, and scalable solutions across AWS, Azure, or equivalent cloud platforms. Apply clean-code practices, design patterns, peer reviews, unit testing, version control, Agile delivery and CI/CD throughout the development lifecycle. Own software quality and operability by addressing performance, reliability, maintainability, accessibility, security, privacy, and technical debt. Prepare and maintain solution documentation, operational guidance, release notes, and support materials. Use AI-assisted engineering tools such as Amazon Q, Kiro, Microsoft Copilot, or equivalent tools for design exploration, coding, refactoring, test generation, documentation, troubleshooting, and productivity improvement, with appropriate human review. AI & Innovation Apply foundational Generative AI and Agentic AI concepts to relevant engineering and delivery use-cases. Prototype solutions using prompt engineering, retrieval-augmented generation (RAG), tool use, orchestration, evaluation, and human-in-the-loop patterns. Explore frameworks and services such as LangChain, LangGraph, CrewAI, Amazon Bedrock, Azure AI, or equivalent technologies. Apply responsible AI practices, including data protection, security, accuracy validation, explainability, traceability, and appropriate human oversight. Contribute ideas and reusable assets that improve engineering productivity, customer experience, delivery quality, and operational efficiency. Business Analysis & Solution Design Collaborate with clients, product owners, architects, business analysts, quality engineers, and other partners to understand business outcomes and translate them into clear functional and technical requirements. Document requirements, user journeys, acceptance criteria, interfaces, data flows, dependencies, risks, and non-functional needs. Analyze business, application, and customer data to inform solution choices, including CRM, loyalty, and marketing technology use cases where applicable. Contribute to discovery sessions, design workshops, estimation, and solution reviews, balancing user value, feasibility, quality, security, scalability, and cost. Use AI-assisted analysis and documentation tools responsibly to accelerate discovery, improve traceability, and validate completeness and accuracy. Quality Engineering & Automation Define and implement unit, integration, API, UI, regression, data, performance, and negative test scenarios aligned to requirements and risk. Validate application and data quality using SQL, backend verification, logs, telemetry, and defect analysis. Build and maintain automated tests using tools and frameworks such as Playwright, Selenium, Postman, ReadyAPI, or equivalent technologies. Embed quality engineering into CI/CD pipelines and support continuous validation across the software development lifecycle. Use AI-assisted techniques to improve test design, coverage analysis, defect triage, and automation, while validating generated outputs for correctness and reliability. Collaboration, Ownership Take end-to-end ownership of assigned outcomes, communicate progress and risks early, and support delivery through to production stability. Flex across development, analysis, testing, data, cloud, automation, documentation, and support activities based on team priorities, while maintaining depth in core engineering capability. Participate in solution and code reviews, knowledge sharing, communities of practice, retrospectives, and continuous improvement initiatives. Mentor peers where appropriate, contribute to a collaborative team culture, and invest in continuous learning as technologies and delivery models evolve. Qualifications Essential Education & Experience Bachelor's degree in Computer Science, Engineering, Information Technology, or a related field, or equivalent practical experience. 5+ years of software engineering experience delivering and supporting production-grade applications. Experience delivering complex initiatives using disciplined engineering, Agile, DevOps, and quality practices. Demonstrated ability to solve complex software problems and manage multiple priorities with attention to detail. Core Technical Skills Strong programming capability in C#/.NET and working proficiency in Python and/or JavaScript/TypeScript, with sound understanding of object-oriented principles and design patterns. Experience with REST APIs, JSON, MVC/Web API, web services, and modern front-end frameworks such as React or Angular. Proficiency in HTML, CSS, responsive web development, and unit-testing frameworks such as NUnit or equivalent. Strong SQL, relational database design, data modelling, and database fundamentals; exposure to MySQL, Oracle, DynamoDB, Snowflake, Redshift, or equivalent platforms. Hands-on experience with Git-based version control, peer review, build automation, CI/CD, and cloud platforms such as AWS or Azure. Understanding of software development, testing, release, support, security, and operational lifecycles. Working knowledge of QA automation and API testing tools such as Playwright, Selenium, Postman, ReadyAPI, or equivalent. AI & Future Skills Practical understanding of Generative AI, Agentic AI, prompt engineering, RAG, and AI-assisted software delivery. Exposure to LangChain, LangGraph, Amazon Bedrock, Azure AI, or similar AI frameworks and services. Ability to use AI-assisted tools for analysis, design, coding, testing, documentation, troubleshooting, and workflow automation, with disciplined verification of outputs. Ability to identify valuable AI use cases, prototype responsibly, evaluate outcomes, and communicate findings through demonstrations, case studies, or presentations. Awareness of responsible AI, privacy, security, intellectual property, and data-handling considerations. Desirable Skills & Experience Cloud-native and serverless services, including AWS EC2, S3, Lambda, Redshift, or equivalent services. Unix/Linux command line, Bash or PowerShell scripting, Python automation, and application observability. Workflow automation using n8n, Make, Zapier, low-code/no-code platforms, or equivalent technologies. Experience with performance engineering, distributed systems, data platforms, CRM, loyalty, or marketing technology solutions. Personal Attributes Excellent verbal and written communication, stakeholder collaboration, analytical thinking, and structured problem solving. Professionalism, integrity, accountability, and a quality-first mindset. Curiosity, learning agility, adaptability, and willingness to work beyond traditional role boundaries. Self-starter who can organize work, coordinate across team members, and operate effectively in collaborative, fast-paced environments. Creative thinker who challenges existing practices constructively and converts learning into measurable improvements. Success in This Role Success is demonstrated through reliable delivery of business outcomes, high-quality and secure engineering, effective use of AI and automation, strong cross-functional contribution, continuous skill growth, and the ability to move fluidly across adjacent responsibilities without compromising accountability or technical depth. 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.