Senior Backend Developer

About us

Xpend Marketing builds advanced marketing solutions that help brands scale fast. We work with leading companies in high-performance industries, supporting their growth across the entire funnel - from acquisition to retention. Our team specializes in performance marketing, paid social, and large-scale campaign management, operating across global markets and high budgets.

With a strong focus on data, speed, and continuous optimization, we enable our partners to launch, test, and scale campaigns that drive real results.

Senior Backend Developer (PHP & Node.js | Ad Tracking & Performance Systems)

We are looking for a highly skilled Backend Developer to join our performance-driven environment. You will be responsible for building and scaling backend systems that handle high volumes of traffic, real-time tracking, and attribution across multiple advertising platforms. This role is ideal for someone who understands both backend engineering and the technical ecosystem behind digital advertising and tracking.

Key Responsibilities

• Design, develop, and maintain backend services using PHP and Node.js
• Build and optimize tracking infrastructure, including:
• Postback systems (S2S / server-to-server)
• Conversion tracking pipelines
• Pixel integrations (client-side & server-side)
• Integrate with major advertising platforms such as Facebook Ads and Google Ads
• Develop APIs and services for handling real-time click and conversion data
• Implement event-driven architectures using AWS SQS for queueing, processing, and scaling tracking events
• Ensure reliable processing of high-volume events with retry, batching, and failure handling strategies
• Ensure accurate multi-channel attribution and data consistency
• Work with high-scale systems processing large volumes of events
• Deploy, manage, and optimize applications on AWS, including:
• EC2
• Elastic Beanstalk
• SQS
• Implement monitoring, logging, and debugging for tracking systems
• Collaborate with marketing and data teams to improve performance and data accuracy
• Maintain code quality and workflows using GitHub

Requirements

• 6+ years of backend development experience
• Strong proficiency in PHP and Node.js
• Solid understanding of online tracking ecosystem, including:
• Postbacks (S2S)
• Tracking pixels
• Attribution models
• Click identifiers (SubIDs, GCLID, etc.)
• Hands-on experience or strong familiarity with Facebook Ads and Google Ads
• Experience in performance marketing / affiliate / ad tech environments
• Hands-on experience with AWS, including:
• EC2
• Elastic Beanstalk
• SQS (queue-based architectures, async processing)
• Strong experience with REST APIs and third-party integrations
• Solid database knowledge (MySQL or similar)
• Experience handling high-volume, real-time systems
• Proficiency with GitHub

Nice to Have

• Experience with server-side tracking (Conversions API, advanced S2S setups)
• Familiarity with tracking platforms (Voluum, Binom, RedTrack, etc.)
• Knowledge of event streaming or messaging systems (Kafka, RabbitMQ, etc.)
• Docker / containerization experience

What We Offer

• Work on systems directly impacting marketing performance and revenue
• Fast-paced, data-driven environment
• Opportunity to build and scale real-time tracking infrastructure
• Close collaboration between engineering and marketing teams