Senior Application Developer (.NET / Ruby on Rails)

Job Title: Senior Application Developer (.NET / Ruby on Rails)

Location: Carrollton, TX (Onsite)
Experience: 8-10 Years

Job Summary

We are seeking an experienced Senior Application Developer (.NET / Ruby on Rails) to design, develop, and support enterprise-grade web applications and microservices. The ideal candidate will have strong expertise in .NET Core, C#, Ruby on Rails, REST APIs, Microservices, Azure/AWS, PostgreSQL, SQL Server, DevOps, Docker, Kubernetes, and Agile development . Experience in the Financial Services or Mortgage domain is highly preferred.

Required Skills

Application Development

• .NET Core / .NET 6+
• C#
• Ruby on Rails
• Ruby
• ASP.NET Core
• MVC Architecture
• Object-Oriented Programming (OOP)
• Design Patterns
• Refactoring
• SOLID Principles

Backend Development

• RESTful APIs
• Microservices Architecture
• Web Services
• API Development
• API Security
• JSON/XML

Testing & Development Practices

• Test-Driven Development (TDD)
• Behavior-Driven Development (BDD)
• RSpec
• NUnit
• Unit Testing
• Integration Testing
• Code Reviews

Databases

• PostgreSQL
• SQL Server
• MySQL
• Relational Databases
• SQL
• Data Modeling
• Query Optimization

Cloud & DevOps

• Microsoft Azure
• AWS
• Docker
• Kubernetes
• CI/CD Pipelines
• Azure DevOps
• Jenkins
• Git
• GitHub
• Deployment Automation

Security

• OAuth 2.0
• IAM (Identity & Access Management)
• CIAM
• Secure Coding Practices
• Authentication & Authorization

Open Source & Operating Systems

• Linux
• Open Source Technologies
• LAMP Stack
• Apache
• PHP (Basic Knowledge)

Methodologies

• Agile
• Scrum
• SDLC
• Continuous Integration
• Continuous Delivery

Soft Skills

• Technical Leadership
• Problem Solving
• Stakeholder Communication
• Mentoring
• Team Collaboration
• Production Support

Key Responsibilities

• Design, develop, and maintain enterprise applications using .NET Core, C#, and Ruby on Rails
• Develop scalable REST APIs and microservices for cloud-native applications
• Apply BDD/TDD methodologies using RSpec and NUnit to ensure high-quality software delivery
• Build, test, and deploy applications through automated CI/CD pipelines
• Prepare and support production deployments while ensuring application stability
• Troubleshoot and resolve production issues, providing timely support for live applications
• Optimize SQL queries, database design, and application performance across PostgreSQL, SQL Server, and MySQL
• Implement secure authentication and authorization using OAuth2, IAM, and CIAM standards
• Collaborate with architects, product owners, QA teams, and business stakeholders throughout the SDLC
• Mentor junior developers, conduct code reviews, and promote engineering best practices
• Participate in Agile ceremonies including sprint planning, stand-ups, retrospectives, and backlog refinement
• Contribute to technical documentation, solution design, and continuous process improvement

Preferred Qualifications

• Experience in Financial Services , Mortgage , or Mortgage-Backed Securities (MBS)
• Experience with Azure or AWS cloud-native application development
• Familiarity with container orchestration using Kubernetes
• Experience working in enterprise-scale Agile environments
• Strong understanding of secure software development practices