Sr. Backend Engineer

Apply now: Senior Backend Software Engineer (Java/Go), Hybrid - Onsite 4 Days/Week. Start date is ASAP for this Contract position.

Job Title: Senior Backend Software Engineer (Java/Go)
Location-Type: Hybrid - Onsite 4 Days/Week, Remote Fridays - Philadelphia, PA
Start Date: ASAP
Duration: Until end of 2026
Compensation Range: $90-105/hr W2
Benefits: Eligible for Health, Dental, Vision, and 401K
Visa Sponsorship: Not eligible for visa sponsorship

Job Description:
The client is seeking a Senior Backend Software Engineer to design, develop, and maintain scalable backend microservices and event-driven systems that power critical product functionality across the organization.

Job Summary
Design, develop, and maintain backend microservices using Java/Spring Boot and Go
Build and support high-performance RESTful APIs and distributed services
Develop and maintain event-driven architectures utilizing Kafka and similar messaging platforms
Work within containerized, cloud-native environments using Docker and Kubernetes
Collaborate across engineering teams while maintaining ownership of assigned workstreams
Leverage AI-powered development tools such as GitHub Copilot and Claude to accelerate delivery
Troubleshoot complex production issues and drive resolution through root cause analysis

Minimum Requirements:
7 years of backend software engineering experience
Strong hands-on experience with Java, Spring Boot, and Go (Golang)
Proven experience designing and building RESTful APIs and distributed systems
Experience with Kafka or comparable event-driven messaging platforms (JMS, RabbitMQ)
Strong experience with Docker and Kubernetes in cloud-native environments
Experience with one or more of the following databases: PostgreSQL, MongoDB, or Couchbase
Demonstrated ability to independently ramp on complex systems and deliver results with minimal oversight

Preferred Qualifications:
Experience with performance and load testing tools such as K6
Experience implementing BDD frameworks, including Cucumber
Familiarity with Istio, AWS EKS, or AWS MSK
Background in startup or smaller-company environments where engineers owned multiple responsibilities
Exposure to service mesh architectures and operating large-scale cloud-native applications