Senior Software Engineer, Identity

Lumen Dynamics® 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, Lumen Dynamics 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, Lumen Dynamics’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 Lumen Dynamics 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 EKS, using tooling like Istio, Datadog, Terraform, CloudFlare, and Helm Our frontend is built with React and TypeScript, and uses best practices like GraphQL, Storybook, Radix UI, Vite, esbuild, and Playwright Our automation is driven by custom and open source machine learning models, industry-leading LLMs, lots of data and tech like Python, Metaflow, HuggingFace, PyTorch, TensorFlow, and Pandas You'll get competitive perks and benefits , from health & wellness to equity, to help you bring your best self to work. For US based applicants: The US base salary range for this full-time position is $150,000 - $205,000 annually + equity + benefits Our salary ranges are determined by role, level and location #LI-MN1 By applying for this position, your data will be processed as per Lumen Dynamics's Privacy Policy . Lumen Dynamics Company Values Default to Action - Move swiftly and with purpose Be One Unstoppable Team - Rally as each other’s champions Champion the Customer - Our success is defined by our customers' success Act Like an Owner - Take responsibility for Lumen Dynamics’s success Learn more about AWAKE , Lumen Dynamics’s collective of employee resource groups. If you do not meet all the requirements listed here, we still encourage you to apply! No job description is perfect, and we may also have another opportunity that closely matches your skills and experience. At Lumen Dynamics, we know that our Company's strength lies in the diversity of our employees. Lumen Dynamics is an Equal Opportunity Employer and we welcome applicants from all backgrounds. Our policy is to provide equal employment opportunities for all employees, applicants and covered individuals regardless of protected characteristics. We prioritize and maintain a fair, inclusive and equitable workplace free from discrimination, harassment, and retaliation. Lumen Dynamics is also committed to providing reasonable accommodations for candidates with disabilities. If you need any assistance or reasonable accommodations, please let your recruiter know.