Senior Business Systems Analyst

This role is based in our London office at least 4 days per week.

How You’ll Make an Impact

Our Data Engineering team transforms complex client data into scalable, high-quality solutions that power digital media, messaging, and loyalty strategies. As a Senior Business Systems Analyst, you’ll sit at the intersection of data, technology, and client strategy—ensuring customer and transaction data is accurately onboarded, automated, and optimised within our data warehouse ecosystem. You’ll play a critical role in translating client requirements into actionable technical specifications, enabling seamless data integration and measurable business outcomes. By ensuring the highest standards of data integrity and governance, you’ll directly impact campaign effectiveness and long-term client success.

What You’ll Achieve

• Own the onboarding and automation of client customer and transaction data across Epsilon products
• Translate business requirements into clear, structured technical documentation for developers
• Analyse and interrogate client datasets to define scalable data warehouse solutions
• Create and validate data mapping rules to ensure accurate implementation
• Conduct code reviews, ensuring business rules are correctly applied in developer scripts
• Present onboarding results and insights to cross‑functional stakeholders
• Act as liaison between clients, Engineering, Pre‑Sales, and downstream teams
• Maintain database integrity and ensure data quality standards are consistently met
• Proactively communicate maintenance events impacting data loads and SLAs
• Build strong internal and external relationships to support long‑term partnership success

Who You Are

What you’ll bring with you:

• 5+ years’ experience onboarding data as a Business Analyst, Data Solutions Engineer, or similar role
• Strong understanding of data warehousing concepts and architecture
• Advanced SQL skills and solid knowledge of relational database design
• Experience working with ETL systems and file transfer methodologies
• Confidence navigating Linux environments and using terminal commands
• Experience working directly with clients and cross‑functional technical teams
• Strong written and verbal communication skills with the ability to articulate detailed specifications
• Excellent time management skills with experience working to service‑level agreements
• A proactive, ownership‑driven mindset with strong analytical problem‑solving ability

Why you might stand out from other talent:

• Experience within the AdTech industry
• Familiarity with Python and Shell scripting
• Experience working within agile engineering environments
• Exposure to digital media data and downstream activation use cases

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.

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

Because You Matter. We know that we have some of the brightest and most talented employees in the world, and we believe in rewarding them accordingly. If you work here, expect competitive compensation, a great benefits package and endless opportunities to advance your career. We offer hybrid working opportunities, with our office space located in the Iconic Television Centre, White City.

As part of our dedication to enhance our inclusive and diverse workforce, Epsilon is committed to equal access to opportunity for people without regard to race, age, sex, disability, neurodiversity, sexual orientation, gender identity, pregnancy and maternity, marriage and civil partnership or religion or belief. We are committed to providing reasonable adjustments for candidates in our application process.