Full Stack Engineer (Java)

Full Stack Engineer – Java, Kafka & AWS MSK MigrationLocation: Seattle, WA (Onsite) | Local candidates only.NTT DATA is seeking a Full Stack Java Engineer with deep expertise in Apache Kafka and AWS Managed Streaming for Apache Kafka (MSK) to help lead the migration of enterprise Kafka infrastructure from self-managed environments to AWS MSK.In this role, you'll design and build event-driven applications, modernize streaming platforms, and ensure a seamless, low-risk migration with minimal impact to business-critical systems. You'll work closely with engineering, DevOps, and infrastructure teams to deliver highly scalable, secure, and resilient solutions.ResponsibilitiesLead the migration of on-premises or self-managed Kafka clusters to AWS MSK, including planning, sizing, replication, and production cutovers.Design, develop, and maintain Java/Spring Boot microservices and REST APIs that publish and consume Kafka events.Build and enhance full-stack applications using modern frontend technologies (React or Angular) where required.Refactor Kafka producers and consumers to support AWS MSK, including IAM authentication, TLS, networking, and security best practices.Optimize Kafka performance through effective partitioning, replication, retention, and consumer group management.Implement monitoring and observability using CloudWatch, Prometheus, Grafana, or similar tools.Develop migration strategies including validation, dual-read/dual-write, rollback planning, and production readiness.Partner with DevOps teams to provision infrastructure using Terraform or CloudFormation.Ensure secure, compliant implementations with encryption, IAM, mTLS, and SASL/SCRAM authentication.Troubleshoot application, streaming, and infrastructure performance issues.Produce technical documentation, migration runbooks, and operational procedures.Mentor junior engineers and promote Kafka and AWS best practices.Required Qualifications5+ years of software engineering experience with Java-based enterprise applications.Strong expertise in Java (8/11/17), Spring Boot, and RESTful API development.Deep experience with Apache Kafka, including: Producers and consumers, Kafka Streams, Kafka Connect, Schema Registry (Avro or Protobuf), Consumer groups and partitioning strategies.Proven experience implementing or migrating workloads to AWS MSK (including MSK Connect or MSK Serverless).Hands-on experience with AWS services including IAM, VPC, CloudWatch, Lambda, S3, and Secrets Manager.Experience building full-stack applications using React or Angular.Experience with CI/CD pipelines (Jenkins or GitLab CI), Infrastructure as Code (Terraform or CloudFormation), and container technologies such as Docker and Kubernetes.Experience working with SQL and NoSQL databases including PostgreSQL, DynamoDB, or MongoDB.Strong understanding of distributed systems, event-driven architectures, scalability, and fault tolerance.Experience supporting large-scale production migrations with minimal downtime.Excellent communication skills and the ability to collaborate across engineering and infrastructure teams.Strong analytical and problem-solving skills with the ability to work independently in fast-paced environments.Preferred QualificationsExperience migrating from self-managed or Confluent Kafka environments to AWS MSK.Financial services or other highly regulated industry experience.AWS certifications (Solutions Architect, Developer Associate, or similar).Experience implementing Kafka security using IAM, mTLS, SASL/SCRAM, and encryption best practices.