Senior Software Developer (.NET / Java)

Genesis10•Pennington, NJ

2d•Onsite

About The Position

Genesis10 is seeking a versatile and technically skilled Software Developer with a primary focus on .NET technologies and secondary proficiency in Java for a contract position with a Global Financial Institution. In this role, you will design, develop, and maintain robust enterprise applications, bridging modern Microsoft stacks with legacy or secondary Java-based microservices. The ideal candidate has deep expertise in C#, .NET Core, and cloud-native architectures, coupled with enough hands-on Java knowledge to support, integrate, or refactor auxiliary backend systems.

Requirements

5+ years of overall software development experience with a strong track record in enterprise application delivery
Advanced proficiency in C#, .NET Core, and Entity Framework Core
Strong experience building and consuming RESTful APIs and microservices
Solid understanding of SQL Server, database design, and query optimization
Working knowledge of Java (Java 8/11/17) and foundational frameworks like Spring Boot
Ability to read, debug, and modify Java backend logic and services
Familiarity with CI/CD pipelines, Git version control, and containerization tools (Docker, Kubernetes)
Experience with cloud platforms (Azure preferred, AWS/GCP acceptable)
Strong problem-solving skills with a solid grasp of data structures, algorithms, and logical reasoning

Responsibilities

Design, build, and maintain scalable web applications, APIs, and microservices using C#, .NET Core / .NET 6/8, and ASP.NET Web API
Write clean, maintainable, and efficient code adhering to SOLID principles and software design patterns
Optimize application performance, scalability, and security across cloud and on-premise environments
Implement automated unit and integration tests using frameworks like xUnit or NUnit
Maintain, troubleshoot, and integrate existing Java-based applications (Spring Boot / Java 11+) within the broader ecosystem
Assist in API communication, data exchange, and gradual migration or interoperability between .NET and Java services
Work closely with product managers, QA, and DevOps teams in an Agile/Scrum environment
Participate in code reviews, architectural discussions, and technical documentation

Benefits

Access to hundreds of clients, most who have been working with Genesis10 for 5-20+ years.
The opportunity to have a career-home in Genesis10; many of our consultants have been working exclusively with Genesis10 for years.
Access to an experienced, caring recruiting team (more than 7 years of experience, on average.)
Behavioral Health Platform
Medical, Dental, Vision
Health Savings Account
Voluntary Hospital Indemnity (Critical Illness & Accident)
Voluntary Term Life Insurance
401K
Sick Pay (for applicable states/municipalities)
Commuter Benefits (Dallas, NYC, SF, and Illinois)