Sr Software Development Engineer

Sr Software Development Engineer (Finance)

Trans Core (TRN), a subsidiary of ST Engineering, is seeking a full-time Senior Software Development Engineer to join our Software Development team in Round Rock, Texas.

The Senior Software Development Engineer will participate in software development team responsibilities focusing on .net projects with an exciting level of risk, complexity and visibility. As a member of a small and focused Solutions Development Team, you may be required to perform various duties within the software development lifecycle - analysis, designer, developer and unit tester. This is a unique opportunity to work in all areas of the software development lifecycle and have view and participation in the entire process.

We are building a team of energetic, self-motivated and passionate developers who strive to be the absolute best and enjoy working with other team members towards a common goal. Our company has an entrepreneurial spirit and welcomes individuals with a can-do attitude, the drive to succeed, and the desire to make an impact within our company.

• Design, develop, test, and enhance software systems that perform critical, real-time processing of data collected from toll collection equipment, executing business logic and decision-making based on incoming data.
• Build and maintain robust, scalable, multi-threaded services and applications using C#, modern .NET/Java frameworks, and various APIs.
• Participate in daily Scrum meetings, provide updates on task progress and collaborate closely with the team to ensure timely delivery of sprint goals.
• Contribute to design discussions for new toll system features and performance improvements to existing functionality.
• Mentor junior and mid-level engineers.
• Assist in system installations and provide post deployment support for customer reported issues
• Assist in trouble shooting customer reported bugs and update the program code base for bug resolutions
• Provide experience-based timelines and estimates for delivering high-quality products based on requirements and specifications.
• Demonstrate hands-on experience building and deploying containerized applications, contributing to modernized and portable deployment workflows.
• Design, develop, and tune relational data structures, stored procedures, and queries in Microsoft SQL Server supporting high-volume transactional toll data.
• Develop and maintain responsive Angular front-end applications that expose real-time toll and account data to operations and customer service users.
• Apply AI-assisted development tools and large language model (LLM) capabilities to accelerate delivery, and contribute to the design, integration, and evaluation of AI/LLM-enabled product features.
• Document program code thoroughly and assist in preparing or updating user manuals and technical guides.

To perform this job successfully, an individual must be able to perform each essential duty satisfactorily. The requirements listed below represent the knowledge, skill, and/or ability required.

• Bachelor's degree in computer science or a related Engineering field required, or equivalent experience. Master's degree in computer science or a related Engineering field is highly preferred.
• 10 to 13 years professional software development experience building multi-threaded applications in C#  Core (now .NET), primarily on Linux based systems and front-end development with Angular.
• Proficient understanding of client-side scripting and JavaScript frameworks.
• Good understanding of Angular and Typescript, Material design, Kendo.
• Good understanding of asynchronous request handling, partial page updates, and AJAX.
• Proficient understanding of cross-browser compatibility issues.
• Strong foundation in Object-Oriented Architecture (OOA) and Service-Oriented Architecture (SOA) principles, with the ability to design modular, maintainable, and scalable systems.
• Proven ability to design and implement scalable, high-performance APIs and microservices.
• Strong experience with Microsoft SQL Server database development, including T-SQL, stored procedures, schema design, indexing, and query performance tuning against large transactional data sets.
• Practical experience developing, packaging, and deploying applications using Docker or similar containerization technologies.
• Hands-on experience using AI-assisted development tools (for example Git Hub Copilot, Claude Code, or equivalent) in day-to-day engineering work, with a practical understanding of large language model (LLM) capabilities, limitations, and appropriate use.
• Demonstrated passion for software design, problem solving, and hands-on development, with a commitment to delivering high-quality, maintainable software solutions.
• Strong communication skills to deliver instructions for the team and communicate well with others.
• Sound decision making and independent judgment.

• Advanced experience developing applications using .NET Core (now…