Senior Software Engineer, Customer Technology

The Senior Software Engineer will be a vital member of Wayfairs engineering organization, contributing to the development and enhancement of a diverse portfolio of applications and systems. In this role, the Senior Software Engineer will work in close collaboration with engineering teams to produce high-quality code, contribute to key architectural decisions, and offer valuable technical guidance. This individual will play an important part in shaping the teams technical direction, proactively addressing potential technical challenges, and promoting a culture of continuous improvement within an Agile setting. This is an opportunity to engage in solving complex problems at scale and make a tangible impact on the customer experience and Wayfairs ongoing success.
What Youll Do
We are seeking a highly motivated Senior Software Engineer to join the Ad Signals team. This team is responsible for developing robust platforms and integrations that facilitate critical Marketing, Data Engineering, and Fraud Detection initiatives. Key responsibilities include managing services that transmit user activity data in a privacy safe approach to advertising partners, thereby ensuring precise ad targeting. Additionally, the team oversees services for tracking performance data downloads and marketing campaign information, which are instrumental in enhancing our data science models.
Build event-driven systems using Kafka, PubSub and real-time data streams, powering automated messaging, feedback loops, and decisioning workflows.
Develop and maintain scalable RESTful APIs and Spring Boot–based microservices, enabling integration across marketing automation systems, customer data pipelines, and external vendors.
Enhance platform reliability and observability by building monitoring dashboards, SLA enforcement metrics, and automated anomaly detection for throughput, latency, and deliverability.
Collaborate cross-functionally with Product, Data Science, and Marketing to define requirements, ensure system interoperability, and drive measurable impact in engagement and conversion.
Raise technical excellence by promoting best practices in backend architecture, distributed system design, API lifecycle management, and continuous integration/deployment.
We Are a Match Because You Have
Bachelors or Masters degree in Computer Science, Software Engineering, or related technical discipline.
11+ years of experience building high-scale backend platforms and APIs for data-intensive or event-driven systems.
Strong command of Java (Spring Boot) and good working knowledge of Python , with deep understanding of object-oriented design, concurrency, and multithreaded programming.
Strong command of stream processing frameworks (Flink, Spark Streaming) or Pub/Sub architectures.
Expertise in Kafka (topics, partitions, consumer groups, schema management) and event-driven microservices design.
Proven experience developing RESTful APIs and microservices with Spring Boot, including authentication, routing, and observability integration.
Strong background in cloud-native application design — deploying and managing workloads on GCP, AWS, or Azure, leveraging Docker and Kubernetes for containerization.
Solid foundation in data modeling, SQL/NoSQL databases, and high-performance data access patterns.
Strong problem-solving, debugging, and optimization skills — with an emphasis on scalability, fault tolerance, and SLA-driven reliability.
Familiarity with observability tools (Datadog, Grafana) and distributed tracing for root-cause analysis.
Ability to mentor engineers, perform design/code reviews, and lead technical discussions across multiple workstreams.
Excellent communication and collaboration abilities across engineering, product, and analytics teams.
Nice to Have
Experience with LLM or GenAI applications (e.g., prompt orchestration, ranking pipelines, or creative optimization systems).
Knowledge of A/B testing infrastructure, experimentation frameworks, and message-governance pipelines.
Background in config-driven workflow automation, feature flagging, or API gateway management.
Assistance For Individuals With Disabilities
Wayfair is fully committed to providing equal opportunities for all individuals, including individuals with disabilities. As part of this commitment, Wayfair will make reasonable accommodations to the known physical or mental limitations of qualified individuals with disabilities, unless doing so would impose an undue hardship on business operations. If you require a reasonable accommodation to participate in the job application or interview process, please let us know by completing our Accomodations for Applicants form.
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About Wayfair Inc.
Wayfair is one of the worlds largest online destinations for the home. Whether you work in our global headquarters in Boston, or in our warehouses or offices throughout the world, were reinventing the way people shop for their homes. Through our commitment to industry-leading technology and creative problem-solving, we are confident that Wayfair will be home to the most rewarding work of your career. If youre looking for rapid growth, constant learning, and dynamic challenges, then youll find that amazing career opportunities are knocking.
No matter who you are, Wayfair is a place you can call home. Were a community of innovators, risk-takers, and trailblazers who celebrate our differences, and know that our unique perspectives make us stronger, smarter, and well-positioned for success. We value and rely on the collective voices of our employees, customers, community, and suppliers to help guide us as we build a better Wayfair – and world – for all. Every voice, every perspective matters. Thats why were proud to be an equal opportunity employer. We do not discriminate on the basis of race, color, ethnicity, ancestry, religion, sex, national origin, sexual orientation, age, citizenship status, marital status, disability, gender identity, gender expression, veteran status, genetic information, or any other legally protected characteristic.
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