Senior Full Stack Java Developer - .NET Modernization

Bring your engineering expertise to a team focused on innovation, modernization, and digital experiences. As a Senior Software Engineer, you ll play a key role in evolving critical applications while driving the transition from .NET to Java/Spring Boot. This role sits on the Maui squad within the organization in Technology & Digital Experiences. It works closely with Product Management and Engineers from across the company. The Senior Software Engineer will report to the Manager, Technology. The portfolio includes mission-critical middleware, applications, scheduled jobs, and reporting. The studio maintains existing .NET applications alongside greenfield Java/Spring Boot services. This role will support ongoing .NET maintenance and participate in .NET-to-Java/Spring Boot migration work. You will collaborate with engineers, product partners, and cross-squad teams as the team grows.

Responsibilities

• Participate in projects encompassing analysis, design, programming, debugging, and modification of software enhancements and/or new products used in local, networked, cloud-based, or Internet-related computer programs.
• Responsible for performing testing and debugging of applications.
• Code may be used in commercial and end-user applications or focus on software and tools supporting infrastructure and technology platforms.
• Code at the component level.
• Work typically involves large or highly sophisticated software programs and systems.
• Possess a proven understanding of current programming languages and technologies, with strong skills in writing code and completing programming tasks.
• Interact with users to define system requirements and/or necessary modifications.
• Design, develop, test, and implement highly scalable software components, fixes, improvements, and/or new systems and applications.
• Build and support REST middleware integrating enterprise consumers.
• Participate in design, testing, deployment, and production support of mission-critical scheduled jobs and services.
• Maintain and enhance existing .NET applications in the SEAS portfolio (bug fixes, enhancements, production support).
• Plan and execute migration of .NET services to Java/Spring Boot, including analysis of legacy code, API parity, testing, and cutover support.
  
  

Required Qualifications

• Minimum 7 years of related work experience.
• Mastery in Java and experience with industry-standard open-source technologies such as Spring, Tomcat, Nginx, and Elasticsearch.
• Experience with Angular and modern front-end development (TypeScript, component-based architecture, and REST API integration).
• Exposure to C# and .NET (Framework and/or .NET Core).
• Ability to read, debug, and refactor legacy .NET codebases while delivering equivalent Java/Spring implementations.
• Comfortable working in an agile environment, with experience in Agile delivery (stand-ups, sprint planning, etc.).
• Experience with the full application development lifecycle, including best practices for unit testing, code reviews, and documentation.
• Experience with build and deployment technologies such as Jenkins, GitLab, Harness CI/CD, and Docker.
• Experience with monitoring and logging tools such as Grafana, AppDynamics, and Splunk.
• Experience working with cloud platforms and container orchestration technologies, including AWS, Kubernetes, and Rancher.
• Able to work well with external partners and contractors.
• Strong communication skills and attention to detail.
  
  

Preferred Qualifications

• Experience with strangler-fig or incremental migration patterns (parallel run, feature flags, phased cutover).
• Familiarity with event-driven and messaging architectures (e.g., Kafka, SNS/SQS, JMS, or similar).
• Knowledge of security best practices for APIs and distributed systems, including OAuth, JWT, TLS, and secrets management.
  
  

Benefits

• 401(k).
• Dental Insurance.
• Health insurance.
• Vision insurance.
• We are an equal-opportunity employer and value diversity, equality, inclusion, and respect for people.
• The salary will be determined based on several factors, including, but not limited to, location, relevant education, qualifications, experience, technical skills, and business needs.
  
  

Additional Responsibilities

• Participate in OP monthly team meetings and participate in team-building efforts.
• Contribute to OP technical discussions, peer reviews, etc.
• Contribute content and collaborate via the OP-Wiki/Knowledge Base.
• Provide status reports to OP Account Management as requested.
  
  

About Us

At OP, we help you harness the power of technology for maximum impact. A technology consulting and solutions company, we offer advisory and managed services, innovative platforms, and staffing solutions across a wide range of fields including AI, cyber security, enterprise architecture, and beyond. For nearly two decades, we ve been challenging the status quo of the consulting industry, serving up fresh, ingenious thinking through a radically lean structure. Together, this strategy delivers unprecedented performance at an unparalleled pace for faster results that propel your business forward.