Senior Performance Data Analyst (Mobility/Tech)

Department: Data

About Buttermilk

Buttermilk is a creative agency shaping the future of the creator economy. We deliver work that’s as culturally sharp as it is commercially impactful, partnering with the world’s most recognisable brands to drive real results and real connection.

We celebrate individuality, move with intent, and support ambitious growth without compromising wellbeing.

Our Values

• Celebrate what makes us weird, with care for others

• Build on intent, not impulse

• Fail fast, learn faster

• Be supported by systems, not limited by them

• Be ambitious, pursue it healthily

Role Overview

The Senior Performance Data Analyst (Mobility/Tech) plays a critical leadership role in shaping how data informs strategy, measurement, and client impact at Buttermilk.

This role leads data and measurement across one of our most significant global mobility/tech accounts, acting as the primary data partner to both client and internal teams. You will own and evolve measurement frameworks, build senior client relationships, and translate complex datasets into clear, actionable insights that drive both creative and commercial outcomes.

You will be expected to bring deep expertise in measurement, proactively identify opportunities to advance our data capabilities, and contribute to the agency’s broader data strategy and thought leadership.

Key Responsibilities

Client Leadership & Partnership

• Own and develop senior relationships with client-side Measurement teams (primary stakeholders) and Marketing teams (secondary), aligning on methodologies, SLAs, and joint initiatives

• Act as a trusted data partner to the client, confidently representing Buttermilk’s measurement approach

• Lead collaboration on advanced measurement initiatives such as creative testing, uplift studies, and creator selection optimisation

Measurement & Framework Development

• Build on existing measurement frameworks to develop line-of-business specific targets, KPIs, and principles, ensuring alignment to broader client objectives

• Uphold and evolve best-in-class measurement practices, ensuring consistency, accuracy, and scalability across campaigns

• Stay ahead of platform and industry changes, assessing new tools, methodologies, and data sources to advance capabilities

Campaign Performance & Insight Generation

• Deliver and present campaign reporting that tells a clear, cohesive story of performance, learnings, and optimisation opportunities

• Develop a deep understanding of client data across campaign, brand, and business levels to provide holistic measurement

• Translate complex datasets into clear narratives across formats (reports, dashboards, presentations, executive summaries)

• Identify and extract high-value insights (“the nuggets”) that inform both immediate optimisations and long-term strategy

Cross-Functional Collaboration

• Partner closely with Campaign, Strategy, Account, and Creator teams across London and New York to maintain visibility on in-flight activity

• Establish processes that enable real-time, data-informed campaign optimisation

• Collaborate on end-of-quarter and annual wrap-ups, weaving performance data into compelling narratives

Process & Output Excellence

• Develop scalable processes for campaign reporting, quarterly reviews, and annual summaries

• Ensure consistency and efficiency in reporting outputs while maintaining a high standard of analytical rigour

• Support proposal development and new business pitches with data-driven insights and frameworks

Thought Leadership & Marketing

• Support the development of case studies in partnership with account leadership, client stakeholders, and internal marketing teams

• Contribute to external thought leadership opportunities, showcasing Buttermilk’s data and measurement expertise (subject to client approval)

Core Competencies

Craft / Technical

• Design and evolve advanced measurement frameworks that inform strategy and quantify success

• Own end-to-end campaign analytics, ensuring accuracy, clarity, and efficiency in reporting

• Apply strong technical skills across SQL, Looker Studio, Excel/Google Sheets, and (ideally) Python

• Maintain deep knowledge of platform performance data across TikTok, Instagram, and YouTube

Business

• Proactively identify opportunities to expand the role of data within the agency and client engagements

• Contribute to the development of proprietary methodologies and data products

• Balance analytical rigour with commercial pragmatism in a fast-paced environment

Personal

• Act as a senior, trusted partner across departments, confidently communicating data insights to non-technical stakeholders

• Demonstrate strong interpersonal and stakeholder management skills, particularly with senior client teams

• Mentor and support junior team members, contributing to overall team development and capability building

Success Metrics

• Successful evolution and implementation of measurement frameworks across the mobility/tech account

• Strength and depth of client relationships, particularly within Measurement and Marketing teams

• Consistent delivery of high-quality, insight-led reporting that drives tangible campaign optimisation

• Contribution to agency growth through data-driven thinking in proposals, pitches, and case studies

• Development of scalable processes that improve efficiency and output quality across teams

Required Experience & Skills

• 5+ years’ experience in a data-led or analytical role within marketing, media, or a related field (agency experience preferred)

• Strong proficiency in SQL, Looker Studio, and Excel/Google Sheets

• Experience with Python is advantageous

• Deep understanding of organic social media measurement; paid social knowledge is a plus

• Experience reporting across platforms including TikTok, Instagram, and YouTube

• Proven ability to manage senior stakeholders and translate complex data into clear, actionable insights

• Strong analytical mindset with a passion for performance, media effectiveness, and the creator economy

• Excellent communication, organisation, and time management skills with high attention to detail

What We Offer

• Private Medical Insurance

• Juno Wellbeing Credits

• Hybrid Working (London)

• £200 Home Office Setup Budget

• Night Key Membership

• Birthday Leave

• Learning & Development Budget

• Friday 2PM Finish