Developer Java Web Sr

Labor Category / Position Title: Developer Java Web Senior / Sr. Backend Developer
Skill Set
Essential Duties & Responsibilities
(Other duties may be assigned)
" Design, develop, and maintain enterprise-grade backend services and APIs supporting train consist management, yard management, equipment management, scheduling, and operational workflows.
" Lead backend development efforts using Java, Spring Boot, REST APIs, and event-driven architectures.
" Design, develop, and support Kafka-based event-driven integrations, producers, consumers, and messaging workflows.
" Design and implement scalable integrations with internal and external systems using APIs, messaging, batch processes, and data pipelines.
" Perform code reviews, mentor developers, and promote engineering best practices across the team.
" Develop and maintain high-quality, secure, and performant Java applications following enterprise standards.
" Design and optimize PostgreSQL database models, queries, indexing strategies, and data access patterns.
" Develop and support batch processing, scheduling, data synchronization, and reconciliation processes.
" Collaborate with Product Owners, Architects, UX designers, and business stakeholders to refine requirements and deliver scalable solutions.
" Participate in application deployment, release planning, production support, performance tuning, and troubleshooting activities.
" Contribute to cloud-native application development and CI/CD automation in AWS environments.
" Ensure adherence to security, compliance, observability, and operational excellence standards.

Minimum Qualifications:
" Bachelor's degree in Computer Science, Information Systems, Engineering, or related field, or equivalent practical experience.
" 8 years of hands-on experience developing enterprise applications using Java.
" 5 years of experience with Spring Boot, REST APIs, and microservice-based architectures.
" 3 years of hands-on experience developing solutions with Apache Kafka.
" Experience designing event-driven architectures using Kafka and messaging platforms.
" Experience building, deploying, and troubleshooting Kafka producers and consumers.
" Understanding of Kafka topics, partitions, consumer groups, offsets, retries, and message delivery patterns.
" Strong experience designing and implementing integration solutions between enterprise systems.
" Strong experience with PostgreSQL database design, SQL optimization, indexing, data modeling, and query tuning.
" Experience building and consuming RESTful APIs and integrating with external systems.
" Hands-on experience with AWS services such as:
o ECS/Fargate
o API Gateway
o Lambda
o S3
o CloudWatch
o Secrets Manager
o CloudFormation
o CodePipeline
o CodeBuild
o ECR
" Experience with Angular and modern web application architectures.
" Experience developing batch processing and scheduler-based applications.
" Strong understanding of event-driven design, domain-driven design, and distributed system patterns.
" Experience with CI/CD and DevOps practices using tools such as Git, Jenkins, Bitbucket, Jira, SonarQube, and automated deployment pipelines.
" Experience working in Agile/Scrum development environments.
" Strong analytical, troubleshooting, communication, and collaboration skills.

Preferred Qualifications:
" Experience with transportation, logistics, railroad, scheduling, asset management, or operational systems.
" Experience with OAuth2/OIDC, Azure Entra ID (Azure AD), SSO, and application security best practices.
" Experience supporting production applications in AWS cloud environments.
" Experience with Dynatrace, CloudWatch, Splunk, or similar monitoring and observability platforms.
" Experience designing highly available and scalable enterprise solutions.
" Kafka administration experience, including topic management, monitoring, performance tuning, and troubleshooting.
" Experience with Schema Registry, message serialization (Avro/JSON), and Kafka ecosystem tooling.
" Experience with large-scale data ingestion, reconciliation, and operational reporting systems.

***Lumen and / or its clients will not provide equipment (Laptop, monitor, etc.) to the selected contractor. The contractor must have their own equipment. Access to a virtual desktop set up (software) will be provided by Lumen s client, allowing the user access to the required systems and technology.***