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

About us

Xpend Marketing develops custom marketing tools that help B2B service providers drive traffic, onboard users, and retain customers at scale. We partner with companies that support leading B2C brands in marketing, operations, customer service, and user engagement-equipping them with the tools to reach massive audiences and deliver measurable results. Our solutions power the full funnel: from precision outreach to seamless activation and long-term retention. With a team of top-tier developers and deep expertise in social media marketing, Xpend delivers the infrastructure behind the success of leading digital experiences. We enable our clients to tap into networks of hundreds of thousands of influencers and launch campaigns that move fast, go wide, and truly convert.

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