Applied Business Software is a Long Beach, California-based Prop Tech company that builds software for the mortgage lending industry. Our marquis product, The Mortgage Office, is the market leader for Loan Servicing software in the private lending industry. We are a fast-growing, well-funded, B2B SaaS tech company with over 1200 SMB+ enterprise customers and drive productivity for an industry that is ripe for technological innovation.
Come join our growing team enabling the most mission-critical projects.

We are seeking a highly skilled and experienced Senior .NET Full Stack Engineer to join our dynamic development team. As senior engineer, you will be responsible for designing, developing, and maintaining software applications using Microsoft technologies. You will collaborate with cross-functional teams, including developers, quality assurance engineers, and product managers, to design, implement and enhance features on the current platform. Your expertise in software development will contribute to enhancing and improving design and delivering high quality software.

This role reports to the COO/CTO. This position is a full-time W2 role and requires you to be on-site in our offices in Long Beach, California.


  • Collaborate with cross-functional teams to gather and analyze requirements, and translate them into technical specifications.
  • Design, develop, and test scalable and high-performance software applications using .NET framework and C#.
  • Write clean, efficient, and maintainable code following best practices and coding standards.
  • Perform code reviews and provide constructive feedback to ensure code quality and adherence to architectural guidelines.
  • Troubleshoot and debug software defects and propose solutions to address them.
  • Optimize application performance and scalability through code optimization and performance tuning techniques.
  • Stay updated with the latest industry trends and technologies, and actively contribute to the improvement of the development process.
  • Collaborate with the QA team to ensure comprehensive test coverage and assist in resolving any issues or bugs.
  • Participate in the entire software development lifecycle, including requirements analysis, design, implementation, testing, and deployment.
  • Mentor junior developers and provide technical guidance and support when required.


  • Bachelor’s degree in Computer Science, Software Engineering, or a related field.
  • A minimum of 7 years full stack software development in related technology.
  • Proven experience as a .NET C# Engineer, with a strong record of accomplishment of delivering high-quality software solutions.
  • In-depth knowledge of the .NET framework, ASP.NET MVC and/or ASP.NET Core, C#, RESTful APIs, and object-oriented programming principles; Windows Server 2012 & IIS Server
  • Proficient in front-end technologies such as JavaScript Libraries (jQuery, Bootstrap or similar), HTML/HTML5, CSS/CSS3, and related frameworks (e.g., React or Angular).
  • Strong understanding of database design and development using SQL Server, Postgres, or other relational databases.
  • Familiar with Team Foundation Server and Access & Excel VBA
  • Experience with version control systems (e.g., Git) and continuous integration/continuous deployment (CI/CD) pipelines.
  • Excellent problem-solving and analytical skills with the ability to prioritize tasks and work in a fast-paced environment.
  • Effective communication and collaboration skills, with the ability to work effectively in a team-oriented setting.
  • If you are a passionate and motivated .NET C# Engineer looking for an exciting opportunity to contribute to the development of industry-impacting software applications, we would love to hear from you. Join our team and make a significant impact on our organization’s success.


  • Full medical benefits
  • 401K matched
  • Paid vacation
  • Paid sick days
  • Paid holidays
  • Awesome holiday party

Top compensation according to experience.

Salary Range: $120,000 – $140,000.

Take the First Step Toward Better Loan Management with The Mortgage Office

Speak with one of our demo experts today!