Lead Data Scientist

Harnham Ltd; London; On-site; GBP 40,000 - 70,000; Full time

Job summary

A fast-growing London-based agency is seeking a Data Scientist to join their performance marketing team. The role involves delivering data-driven projects, engaging in advanced analytics, and providing strategic consulting using first-party data. Ideal candidates will have strong skills in Python, SQL, and cloud technologies, with opportunities for mentoring.

Qualifications

• Experience with Python and SQL is essential.
• Familiarity with GCP or AWS is desirable.
• Management experience is a plus, but mentoring is also welcomed.

Responsibilities

• Conduct data-driven projects across platforms like Google and Meta.
• Engage in experimentation and advanced analytics.
• Provide strategic consulting for major clients.

Skills

Python

SQL

GCP/AWS

Experimentation

MMM

Propensity Modelling

LTV Modelling

Job description

Cookies are small text files that can be used by websites to make a user's experience more efficient.

The law states that we can store cookies on your device if they are strictly necessary for the operation of this site. For all other types of cookies, we need your permission.

This site uses different types of cookies. Some cookies are placed by third-party services that appear on our pages.

You can at any time change or withdraw your consent from the Cookie Declaration on our website.

Learn more about who we are, how you can contact us, and how we process personal data in our Privacy Policy.

Please state your consent ID and date when you contact us regarding your consent.

Your consent applies to the following domains: www.harnham.com

Necessary (16)

1. AWSALBTG Typeform: Registers which server-cluster is serving the visitor. Used with load balancing to optimize user experience. 7 days HTTP Cookie
2. AWSALBTGCORS Typeform: Same as above. 7 days HTTP Cookie
3. bcookie LinkedIn: Used to detect spam and improve security. 1 year HTTP Cookie
4. li_gc LinkedIn: Stores the user's cookie consent state. 180 days HTTP Cookie
5. OptanonConsent cdn.cookielaw.org: Determines if the visitor has accepted the cookie consent box. 1 year HTTP Cookie
6. wordpress_test_cookie www.harnham.com: Checks if the browser supports cookies. Session HTTP Cookie
7. wpEmojiSettingsSupports www.harnham.com: Supports content delivery and presentation settings. Session HTML Local Storage

Preferences (2)

1. lang LinkedIn: Maintains language settings. Session HTTP Cookie
2. lidc LinkedIn: Registers server-cluster info for load balancing. 1 day HTTP Cookie

Statistics (2)

1. vuid Vimeo: Collects data on page visits. 2 years HTTP Cookie
2. #-# YouTube: Tracks interaction with embedded content. Session HTML Local Storage

Marketing (23)

1. #-# YouTube: Tracks user interaction with embedded videos. Session HTML Local Storage
2. _ga Google: Sends data to Google Analytics. 2 years HTTP Cookie
3. _ga_# Google: Same as above. 2 years HTTP Cookie
4. iU5q-!O9@$ YouTube: Registers a unique ID for YouTube videos. Session HTML Local Storage
5. LAST_RESULT_ENTRY_KEY YouTube: Tracks interaction with embedded content. Session HTTP Cookie
6. LogsDatabaseV2:V#||LogsRequestsStore YouTube: Tracks interaction. Persistent IndexedDB
7. optimizelyOptOut Optimizely: Collects visitor data for targeted ads. Session HTTP Cookie
8. remote_sid YouTube: Necessary for YouTube content. Session HTTP Cookie
9. ServiceWorkerLogsDatabase#SWHealthLog YouTube: Necessary for YouTube content. Persistent IndexedDB
10. TESTCOOKIESENABLED YouTube: Tracks interaction. 1 day HTTP Cookie
11. ytidb::LAST_RESULT_ENTRY_KEY YouTube: Tracks interaction. Persistent HTML Local Storage
12. YtIdbMeta#databases YouTube: Tracks interaction. Persistent IndexedDB
13. yt-remote-cast-available YouTube: Stores video player preferences. Session HTML Local Storage
14. yt-remote-cast-installed YouTube: Stores preferences. Session HTML Local Storage
15. yt-remote-connected-devices YouTube: Stores preferences. Persistent HTML Local Storage
16. yt-remote-device-id YouTube: Stores preferences. Persistent HTML Local Storage
17. yt-remote-fast-check-period YouTube: Stores preferences. Session HTML Local Storage
18. yt-remote-session-app YouTube: Stores preferences. Session HTML Local Storage
19. yt-remote-session-name YouTube: Stores preferences. Session HTML Local Storage

*Please note, this company is unable to sponsor, and you must be a UK resident to apply*

THE COMPANY

Join a fast-growing London-based agency that specialises in performance marketing and cutting-edge technology. The agency delivers services across paid search and social, data engineering, analytics, and marketing automation. The agency partners with major brands across retail, travel, tech, and entertainment, and runs an inclusive Early Careers Scheme to support entry into marketing and tech. Their mission: to fuel scalable, sustainable growth through data-driven marketing and innovative tech solutions.

THE ROLE

This performance marketing agency focuses on digital analytics and measurement, delivering long-term, data-driven projects across platforms like Google and Meta. Data Scientists play a key role in experimentation and measurement (including incrementality, attribution, and MMM), as well as advanced analytics such as lifetime value and propensity modelling. Projects involve cloud-based environments, with models deployed directly into advertising platforms. The work goes beyond typical agency tasks, including strategic consulting for major clients and direct access to robust first-party data - a rare advantage in the agency space.

SKILLS + EXPERIENCE

• Python + SQL and ideally GCP/AWS
• Key methodologies are Experimentation (incrementality, brand lift studies, geo lift testing, causal inference), MMM, Propensity and LTV modelling
• Management experience desirable but open to mentoring

HOW TO APPLY

If this sounds like the role for you, swiftly send over your CV to Izzi at Harnham by using the link below.

If you can’t see what you’re looking for right now, send us your CV anyway – we’re always getting fresh new roles through the door.