Sr Application Developer

Pennymac • Westlake Village, CA

4d • $90,000 - $150,000 • Onsite

About The Position

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.

Requirements

• Bachelor’s degree or equivalent work experience
• 5+ years of relevant work experience
• Experience with relational databases (MySQL, PostgreSQL, SQL Server)
• Knowledge of design patterns, refactoring and unit testing
• Experience with Linux and open source software

Nice To Haves

• Knowledge of Agile Methodologies, such as Extreme Programming (XP) and Scrum is helpful
• Financial services experience, especially related to mortgages and mortgage backed securities, is desirable

Responsibilities

• Accelerated C#/.NET Development:
• Extensively utilize AI tools such as Cursor and GitHub 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 potential performance bottlenecks and security vulnerabilities.
• AWS Cloud Integration and Services: Demonstrate strong experience in integrating applications with key AWS Services, including:
• 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 Behavior-Driven Development (BDD) and Test-Driven Development (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 a 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.

Benefits

• Comprehensive Medical, Dental, and Vision
• Paid Time Off Programs including vacation, holidays, illness, and parental leave
• Wellness Programs, Employee Recognition Programs, and onsite gyms and cafe style dining (select locations)
• Retirement benefits, life insurance, 401k match, and tuition reimbursement
• Philanthropy Programs including matching gifts, volunteer grants, charitable grants and corporate sponsorships

What This Job Offers

• Job Type: Full-time
• Career Level: Mid Level
• Number of Employees: 5,001-10,000 employees