Principal Software Engineer (Go / AdTech) Location: West Midlands (Hybrid)
Salary: Competitive + Bonus + Equity Options
Type: Full-time, Permanent

Build the Future of eCommerce GrowthWe're partnering with a rapidly scaling SaaS technology company transforming how eCommerce brands acquire, engage and retain customers. Following significant growth and investment, we're looking for a Principal Software Engineer to help shape the next generation of our advertising and marketing technology platform.
This is a strategic technical leadership role where you'll influence architecture, mentor engineering teams, and drive the development of high-scale systems processing significant advertising and customer data volumes across multiple digital channels.

If you've built AdTech platforms, worked with advertising APIs, and enjoy solving complex distributed systems challenges, we'd love to speak with you.
The RoleAs a Principal Engineer, you'll provide technical leadership across multiple engineering teams while remaining hands-on with architecture and critical development initiatives.

You'll play a key role in evolving a platform that integrates deeply with major advertising ecosystems, helping merchants optimise campaign performance and maximise customer acquisition ROI.
Key Responsibilities

Lead the architecture and design of highly scalable cloud-native systems.
Drive technical strategy and engineering best practices across the organisation.
Build and optimise backend services using Go.
Design and develop integrations with major advertising platforms and APIs.
Collaborate with Product, Data, and Commercial teams to deliver innovative AdTech capabilities.
Mentor senior engineers and contribute to engineering leadership.
Champion performance, reliability, security, and observability across the platform.
Influence technology decisions and long-term platform evolution.

What We're Looking ForEssential Experience

Significant experience in a Principal, Staff, Lead, or Senior Software Engineering role.
Strong commercial experience with Go (Golang).
Experience building and scaling distributed SaaS platforms.
Strong cloud experience, ideally with Google Cloud Platform (GCP).
Experience working within AdTech, MarTech, Performance Marketing, or Digital Advertising environments.
Hands-on experience integrating with advertising platforms and APIs.

Advertising Platform ExperienceWe're particularly interested in candidates with experience of:

Google Ads (highly desirable)
Microsoft Advertising / Bing Ads (highly desirable)
Meta (Facebook & Instagram Ads)
TikTok Ads
Other paid media and programmatic advertising platforms

Additional Skills

Experience with React and modern frontend development.
Event-driven and microservices architectures.
Data-intensive systems and analytics platforms.
CI/CD, Infrastructure as Code, and modern engineering practices.
Strong stakeholder management and technical communication skills.

Nice to Have

Experience within eCommerce technology platforms.
Exposure to customer acquisition, attribution, campaign optimisation, or marketing analytics products.
Experience operating at hyper-growth scale.
Previous involvement in platform modernisation or large-scale technical transformation initiatives.

Why Join?

Join a genuine high-growth SaaS success story.
Work on technically challenging products at significant scale.
Influence business-critical architecture and technology decisions.
Collaborative, engineering-led culture.
Competitive salary, bonus, and equity opportunity.
Flexible hybrid working in the West Midlands.

If you're passionate about building world-class AdTech platforms and want to play a pivotal role in a scaling technology business, we'd love to hear from you.

Eligo Recruitment is acting as an Employment Business in relation to this vacancy. Eligo is proud to be an equal opportunity employer dedicated to fostering diversity and creating an inclusive and equitable environment for employees and applicants. We actively celebrate and embrace differences, including but not limited to race, colour, religion, sex, sexual orientation, gender identity, national origin, veteran status, and disability. We encourage applications from individuals of all backgrounds and experiences and all will be considered for employment without discrimination. At Eligo Recruitment diversity, equity and inclusion is integral to achieving our mission to ensure every workplace reflects the richness of human diversity.

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