Client Integrations Engineer

Publicis Groupe UK; Greater London; On-site; GBP 70,000 - 95,000; Full time

Job summary

Epsilon, part of Publicis Groupe, seeks a Client Integration Engineer in London. You will develop scripts, maintain data feeds, and integrate clients into the Epsilon platform, acting as a hybrid web technologist and solutions architect.

You’ll collaborate across engineering, analytics, product, and sales to deliver scalable, data-driven solutions. Ideal candidates have 3+ years in a similar digital role, with expertise in JavaScript, SQL, HTML, and ad-tech ecosystems.

Qualifications

• 3+ years in a similar digital role and strong coding in JavaScript, SQL, HTML.
• Experience with ad tagging, tracking scripts, and measurement.
• Familiar with DSPs, Ad Servers, SSPs, CDPs, and DMPs.
• Able to troubleshoot discrepancies in impression, click, conversions.
• Knowledge of UTM parameters, URLs and query strings for campaigns.
• Understanding of RTB mechanics and brand safety technologies.
• Strong communication and problem-solving abilities.

Responsibilities

• Develop scripts, maintain databases, and process data feeds for new client initiatives.
• Integrate clients into the Epsilon system with technical solutions.
• Conceptualize integration strategies for large-scale clients and provide ongoing support.
• Collaborate with cross-functional teams globally across engineering, analytics, product and sales.
• Troubleshoot issues and drive them to resolution.

Skills

3+ years experience

digital ad tagging

tracking scripts & pixels

DSPs

Ad Servers

SSPs

CDPs

DMPs

troubleshooting data

UTM parameters

URL structures

RTB mechanics

brand safety

problem-solving

communication skills

JavaScript

SQL

HTML

team collaboration

Education

Bachelor’s degree in computer science or MIS

Tools

PHP

Shell

Python

Job description

Company Description

Overview

How You’ll Make an Impact

Our Client Integration Engineers are experienced client facing digital technologists. You will become responsible for providing technical solutions and strategies to help our clients achieve their digital marketing objectives. This includes integrating new clients onto the Epsilon platforms, managing the technical relationship with existing clients, driving automation initiatives and providing technical sales support. An Epsilon Client Integration Engineer is a unique hybrid role within our company that combines aspects of a web technologist, business analyst and solutions architect. Our Client Integration Engineers leverage their technical capabilities, commercial acumen and knowledge of the Epsilon platform to design and deliver actionable strategies and solutions. Reporting in the Director Client Integration you will also have the opportunity to collaborate across Sales, Account Management, Media Delivery, Product and Engineering teams to produce high quality results serving as a subject matter expert or facilitator as needed. This is a hybrid role based in London.

Responsibilities

What You’ll Achieve

• You will be developing scripts, maintaining database tables, and processing data feeds to support new client initiatives Integrating our clients into the Epsilon system: designing, developing, implementing and testing technical solutions based on client and business requirements.
• Conceptualizing integration strategies for complex, large-scale clients whilst providing on-going support & maintenance of existing clients
• Identify and assist in developing enhancement opportunities and best practices across the enterprise through innovation, automation and knowledge sharing.
• Work with internal and external cross teams globally, including engineering, analytics, account management, product management and sales
• Oversee troubleshooting issues impacting the team and drive them to resolution

Qualifications

Who You Are

• What you’ll bring with you:
  • Ideally 3+ years’ experience in a similar digital role
  • Have a strong knowledge of digital ad tagging, tracking scripts & pixels, and measurement
  • Have experience with DSPs, familiar with Ad Servers & understand SSPs, CDPs, and DMPs
  • Have proven experience troubleshooting discrepancies in impression, click, and conversion data
  • Can identify and resolve ad delivery, tracking, and reporting issues
  • Have experience with UTM parameters, URL structures, and query strings for campaign tracking
  • Are familiar with programmatic buying and real-time bidding (RTB) mechanics
  • Understands brand safety, viewability, and fraud detection technologies
  • Are passionate about problem-solving and using their analytical side
  • Are inquisitive and need to know why we are doing whatever we are doing!
  • Like to be organized - Time management and follow-through skills are second nature.
  • Possess excellent verbal and written communication skills and can tailor their communication style to the recipient.
  • Have advanced coding experience in JavaScript, SQL, HTML.
  • Love working in an energetic and engaging team environment.
  • Are intrigued by the digital industry, have a good understanding of online tracking technologies and the digital marketing landscape
  • Have experience in a solutions architect/engineer or otherwise relevant technical role in AdTech or similar.
• Why you might stand out from other talent:
  • Bachelor’s degree in computer science, Management Information Systems (MIS), or equivalent experience.
  • Coding languages such as PHP, shell, python would be a nice to have.

Additional Information

When You Join Us, We’ll Create Something EPIC TogetherEpsilon 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.

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 parental, marriage and civil partnership or religion or belief. We are committed to providing reasonable adjustments for candidates in our application process.

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