Sr Application Developer

PENNYMAC

Pennymac (NYSE: PFSI) is a specialty financial services firm with a comprehensive mortgage platform and integrated business focused on the production and servicing of U.S. mortgage loans and the management of investments related to the U.S. mortgage market.

At Pennymac, our people are the foundation of our success and at the heart of our dynamic work culture. Together, we work towards a unified goal of helping millions of Americans achieve aspirations of home ownership through the complete mortgage journey.

Job Overview Senior Application Developer (C#, SQL Server, AI-Accelerated, AWS Cloud)

The Senior Application Developer will be a key player in designing, developing, and maintaining high-performance enterprise applications, significantly leveraging AI-powered development tools and AWS cloud services to accelerate delivery and quality.

Core Responsibilities Accelerated C#/.NET Development

• Extensively utilize AI tools like Cursor and Git Hub Copilot for rapid prototyping, intelligent code completion, refactoring complex methods, and generating robust unit tests.
• Design, develop, and maintain C# and .NET (Core/Framework)-based services and applications, specializing in back-end logic, APIs (e.g. ASP.NET Web API), and enterprise solutions.

Database Development & Optimization

• Develop, optimize, and tune high-performance SQL Server stored procedures, functions, and complex queries.
• Use AI tools to analyze existing SQL code for performance bottlenecks and security vulnerabilities.

AWS Cloud Integration and Services

• Amazon SQS (Simple Queue Service) for decoupling microservices and managing message queues.
• Amazon SES (Simple Email Service) for handling bulk and transactional email delivery.
• Amazon S3 (Simple Storage Service) for object storage, file management, and static content hosting.

Quality Mandates (Unit Testing & Coverage)

• Mandate and enforce high standards of unit testing for all new and modified code.
• Achieve and maintain required code coverage minimums for all deliverables, integrating coverage analysis into the CI/CD pipeline.
• Employ BDD and TDD techniques, using AI-assisted tools to scaffold test code quickly and comprehensively (e.g. using NUnit or xUnit).

Project Leadership and Culture

• Manage small development projects independently and actively contribute as senior team member on larger, complex initiatives under Agile Methodologies.
• Prepare, configure, and automate the deployment of software to various environments, including production.
• Provide timely and effective technical support, responding to and resolving escalated issues and bugs logged by end-users of live systems.
• Demonstrate professional behaviors and a growth mindset aligned with the organization's desired culture and values.

A Typical Day

The Senior Application Developer will be a key player in designing, developing, and maintaining high-performance enterprise applications, significantly leveraging AI-powered development tools and AWS cloud services to accelerate delivery and quality.

What You’ll Bring

• Bachelor’s degree or equivalent work experience.
• 5+ years of relevant work experience.
• Knowledge of Agile Methodologies, such as Extreme Programming (XP) and Scrum is helpful.
• Experience with relational databases (MySQL, Postgre
  
  SQL, SQL Server).
• Knowledge of design patterns, refactoring and unit testing.
• Experience with Linux and open source software.
• Financial services experience, especially related to mortgages and mortgage-backed securities, is desirable.

Why You Should Join

As one of the top mortgage lenders in the country, Pennymac has helped over 4 million lifetime homeowners achieve and sustain their aspirations of home. Our vision is to be the most trusted partner for home. Together, 4,000 Pennymac team members across the country are guided by our core values: to be Accountable, Reliable and Ethical in all that we do.

Pennymac is committed to conducting a business that makes positive contributions and promotes long-term sustainable growth and to fostering an equitable and inclusive environment, where all employees and customers feel valued, respected and supported.

Benefits That Bring It Home

Whether you're looking for flexible benefits…