Senior Java/J2EE Engineer (Telecom Billing & API)

Quick Facts

• Location: Denver, CO (Onsite – 5 days a week)
• Experience: 8+ years
• Type: Contract
• Openings: 5

Description

Build and deliver scalable Java/J2EE Spring Boot microservices and REST APIs for telecom billing, pricing, and complex commercial business logic. Translate telecom rating and billing rules—rate plans, discounts, credits, promotions, and billing exceptions/overrides—into reliable technical solutions using event-driven architecture.

Responsibilities

• Design and develop telecom billing/pricing services using Java and Spring Boot microservices
• Implement REST API development with API specifications (OpenAPI/Swagger/YAML)
• Integrate event-driven workflows using Kafka
• Apply API management and security best practices (Apigee/API Gateway, OAuth2/JWT)
• Containerize and deploy services with Docker and Kubernetes
• Work within a GitLab CI/CD workflow
• Apply telecom billing rules, exceptions, and overrides in technical implementations

Requirements

• 8+ years of hands-on experience in Java/J2EE, including Spring Boot and microservices
• Meaningful experience in telecom billing and pricing business logic (rate plans, discounts, credits, promotions)
• Ability to translate complex telecom pricing and billing logic into scalable technical solutions
• Experience building REST APIs and using OpenAPI/Swagger (including YAML-based specs)
• Experience with Kafka and event-driven architecture
• Strong AWS experience
• Knowledge/experience with API management (Apigee/API Gateway)
• Strong API security experience using OAuth2/JWT
• Experience with Docker and Kubernetes
• Experience with GitLab CI/CD
• Practical experience with AI-assisted coding tools (Claude/Claude Code/GitHub Copilot or similar) is highly preferred

Benefits

• Urgent contract hiring with multiple openings