Senior Software Engineer, Identity

Attentive® is the AI marketing platform for 1:1 personalization redefining the way brands and people connect. We’re the only marketing platform that combines powerful technology with human expertise to build authentic customer relationships. By unifying SMS, RCS, email, and push notifications, our AI-powered personalization engine delivers bespoke experiences that drive performance, revenue, and loyalty through real-time behavioral insights. Recognized as the #1 provider in SMS Marketing by G2, Attentive partners with more than 8,000 customers across 70+ industries. Leading global brands like Crate and Barrel, Urban Outfitters, and Carter’s work with us to enable billions of interactions that power tens of billions in revenue for our customers. With a distributed global workforce and employee hubs in New York City, San Francisco, London, and Sydney, Attentive’s team has been consistently recognized for its performance and culture. We’re proud to be included in Deloitte’s Fast 500 (four years running!), LinkedIn’s Top Startups , Forbes’ Cloud 100 (five years running!), Inc.’s Best Workplaces , and the Human Rights Campaign Foundation's Corporate Equality Index ! About the Role Our Engineering team creates innovative product experiences that power personalized marketing at massive scale. We develop cutting-edge applications and systems that process 100s of billions of messages and events per year, enabling marketers to connect effectively with hundreds of millions of consumers. Joining our team offers a high-growth career opportunity to work with some of the world’s most talented engineers in a high-performance and high-impact culture. Our Identity team ensures that all the data Attentive captures across multiple sources is associated with the right person, critical to all downstream messaging and personalization. We use multiple strategies to maintain a robust Identity graph and are constantly experimenting to drive our capture and accuracy rates higher. As a Senior Software Engineer on our Identity team, you will own and improve a critical system that processes billions of events per day, ensuring its stability and performance as we layer on additional identification strategies and guardrails. At the same time, you will contribute to multiple experiments to drive our identity capture and accuracy higher across the stack, working alongside our frontend engineers or delivering solutions for our data scientists. You will work closely with Product, Data Science, and Analytics. What You’ll Accomplish Design, build, and optimize high-scale systems that accurately resolve fragmented customer identities across first-party and third-party data sources Develop advanced session enrichment capabilities to enhance anonymous and known user tracking, improving attribution and personalization Build core matching algorithms that power real-time identity stitching, device graphing, and unified customer profiles Collaborate cross-functionally with data science, product, and analytics teams to create flexible identity models that support a wide range of business use cases. Define and enforce data quality, privacy, and security standards for customer and session data across all ingestion and resolution pipelines. Continuously monitor, evaluate, and improve the accuracy, speed, and scalability of our identity resolution and tracking systems. Your Expertise 5+ years of professional experience in software development Experience maintaining high-scale, real-time data processing systems Strong communication skills and a product-oriented mindset. Able to understand the “what” and “why” behind technical work, collaborate effectively with Product and Analytics teams, and translate business needs into scalable solutions What We Use Our backend is Java / Kotlin / Spring Boot microservices, built with Gradle, coupled with things like DynamoDB, Aurora, AirFlow, Postgres, and Redis, hosted via AWS Our infrastructure runs primarily in Kubernetes hosted in AWS’s