Staff Software Engineer, Google Tag Manager & Server-Side Tagging

About the Role

We are a global technology company operating in the consent management and privacy solutions space. Our vision is to enable a digital ecosystem where user privacy and business growth go hand in hand. Our mission is to help organizations manage user consent transparently, comply with global privacy regulations, and build lasting trust with their users.

We are looking for a Staff Software Engineer with expert-level knowledge of Google Tag Manager (GTM) and Server-Side GTM (sGTM), including the development of custom templates, clients, tags, and end-to-end event flows. In this role, you will architect and build a server-side tagging product, improve the template ecosystem, and ensure high-performance, privacy-aligned event delivery.

This role is ideal for someone who understands the internals of GTM and sGTM, the sandboxed JavaScript environment, and how to design scalable tagging infrastructures on modern cloud platforms.

Your Responsibilities

• Design, implement, and scale a server-side GTM hosting platform, including container orchestration and runtime optimizations

• Build advanced GTM and sGTM templates (clients, tags, variables), including sandboxed JavaScript logic, permissions, and data transformations

• Design event ingestion workflows, transformation layers, and commerce analytics mappings (e.g. GA4 eCommerce, Measurement Protocol)

• Implement and optimize server-side data routing, caching, and identity management

• Integrate with external analytics, advertising, and third-party APIs to support complex tracking setups

• Lead complex technical initiatives that span product and infrastructure boundaries

What You Bring

• 5+ years of software engineering experience, ideally with strong backend exposure

• Deep hands-on expertise with GTM and sGTM, including:

  • Client templates

  • Tag templates

  • Variable templates

  • Permissions and sandboxed script restrictions

• Strong proficiency in JavaScript, Node.js, and TypeScript

• Solid grounding in API and service design, including security considerations

• Strong understanding of GA4, ecommerce schemas, Measurement Protocol, and cross-platform data mapping

• Experience with CDNs for caching, edge execution, and traffic routing

• Hands-on experience with cloud-native infrastructure (experience with major cloud providers is a plus)

• Ability to lead system design discussions and influence architectural direction

Nice to Have

• Experience running Kubernetes clusters and container-based tagging pipelines

• Background in web analytics, digital measurement, or marketing engineering

• Understanding of consent management, privacy enforcement, and compliance-aware data flows

Sphere Digital Recruitment currently have a variety of job opportunities across digital so feel free to get in touch with us to find out how we can help you. Please take a look at our website.

Sphere is an equal opportunities employer. We encourage applications regardless of ethnic origin, race, religious beliefs, age, disability, gender or sexual orientation, and any other protected status as required by applicable law.

If you require any adjustments or additional support during the recruitment process for any reason whatsoever, please let us know.