Senior Application Developer - Securitized Products (Java & .NET)

It Starts Here Santander is a global leader and innovator in the financial services industry and is evolving from a high-impact brand into a technology-driven organization. Our people are at the heart of this journey and together, we are driving a customer-centric transformation that values bold thinking, innovation, and the courage to challenge what’s possible. This is more than a strategic shift. It’s a chance for driven professionals to grow, learn, and make a real difference.

If you are interested in exploring the possibilities We Want to Talk to You! The Difference You Make The Senior Developer, Application Development serves as a highly experienced, hands-on technical contributor responsible for the development, enhancement, support, and stability of business-critical Fixed Income and Securitized Products applications. This role combines deep technical expertise in Java, C#/.NET, ASP.NET, API development, SQL Server, and enterprise application support with strong business engagement to deliver reliable, scalable, and high-performing solutions.

The Senior Developer plays a key role in the analysis, design, development, troubleshooting, production support, and modernization of applications that support trading, operations, risk, market data, and reporting functions. The role requires a strong understanding of Fixed Income and Securitized Products markets, exceptional analytical skills, and the ability to collaborate effectively with business stakeholders and technology teams to solve complex technical and operational challenges.

• Act as a senior hands-on C#/.NET developer supporting multiple business-critical applications and services.
• Design, develop, enhance, and maintain ASP.NET applications, APIs, backend services, and SQL Server-based solutions.
• Provide advanced expertise in application support, production issue resolution, root cause analysis, and platform stability initiatives.
• Partner with Fixed Income and Securitized Products business users, operations teams, and technology stakeholders to translate business requirements into reliable technical solutions.
• Support and enhance platforms involved in trade processing, positions management, pricing, market data integration, reporting, and regulatory workflows.
• Design and implement scalable, high-performance solutions while ensuring data integrity, operational resiliency, and maintainability.
• Develop and optimize SQL Server database components, including T-SQL, stored procedures, query performance tuning, data analysis, and troubleshooting.
• Lead troubleshooting efforts across application, database, integration, and performance-related issues.
• Contribute to system modernization, technical debt reduction, automation, and continuous improvement initiatives.
• Accurately estimate development effort, identify technical risks, and support project planning and delivery commitments.
• Mentor junior and mid-level developers while promoting engineering best practices, code quality, and knowledge sharing.
• Collaborate closely with architects, product owners, support teams, and business stakeholders to ensure successful delivery and operational excellence.
• Maintain strong focus on data accuracy, controls, performance optimization, and operational efficiency.

What You Bring To perform this job successfully, an individual must be able to perform each essential duty satisfactorily. The requirements listed below are representative of the knowledge, skill, and/or ability required. Reasonable accommodation may be made to enable individuals with disabilities to perform the essential functions.

Education

• Bachelor’s Degree: in related field or equivalent demonstrated through a combination of work experience, training, military service, or education - Required

Qualifications

• 9+ Years Information Technology, Technical Application Development, or similar experience. - Required.
• 7+ years of hands-on experience developing and supporting enterprise applications using C#/.NET technologies with hands-on Java development experience.

• Strong expertise with the following:

• C#
• Java
• .NET Framework / .NET Core
• ASP.NET MVC and Web Applications
• RESTful APIs and backend service development

• Object-oriented design principles and design patterns

• Advanced experience with Microsoft SQL Server, including:

• T-SQL development
• Stored procedures
• Query optimization
• Database troubleshooting
• Data analysi…