Martech Engineer

23 days ago

London, United KingdomSenior

Responsibilities

Own the Google Tag Manager setup, including the server-side GTM container, and review tracking changes from other teams.
Partner daily with paid marketing to fix tracking bugs, instrument landing pages and campaigns, and investigate conversion discrepancies.
Build and maintain server-to-server conversion tracking, including Meta CAPI and Google Enhanced Conversions, and validate pixel/server deduplication.
Improve tracking script performance while keeping page speed and Core Web Vitals within budget.
Enforce consent handling and regional restrictions across markets.
Define and document event schemas and UTM conventions.
Build monitoring and alerting to detect measurement failures quickly.
Review conversion-event pull requests and collaborate with product engineering on tracking integrations.

Strong JavaScript and TypeScript skills with experience in frontend code and production application codebases.
Hands-on Google Tag Manager experience, including server-side GTM.
Experience implementing at least one server-to-server conversion API, such as Meta CAPI or Google Enhanced Conversions.
Experience debugging attribution discrepancies, pixel/server deduplication, UTM conventions, and event schema design.
Solid understanding of web performance and Core Web Vitals.
Working knowledge of consent and privacy requirements, including Consent Mode v2 and regional restrictions.
SQL experience for validating tracking data in a warehouse.
Bonus qualifications include experience with Segment, RudderStack, Snowplow, GA4, Amplitude, PostHog, dbt, Next.js, incrementality testing, or media mix modelling.

Fully remote role that can be performed globally, with optional access to offices in London, New York, Madrid, Warsaw, and other locations.
Annual discretionary professional development stipend.
Annual discretionary stipend for meeting colleagues through social travel.
Monthly co-working stipend for employees outside main hubs.
Annual company offsite in a new location.
Growth opportunities toward marketing engineering leadership, senior/staff IC work, data engineering, attribution modelling, or growth engineering.

1,001-5,000 employees