An extraordinarily talented group of individuals work together every day to drive TNS' success, from both professional and personal perspectives. Come join the excellence! Overview We are seeking an experienced Senior .NET Developer to design, build, and maintain high-availability, scalable applications within a modern cloud-enabled environment. This role requires deep technical expertise in the .NET ecosystem and the ability to actively contribute to architectural and design decisions while mentoring team members. You will be expected to contribute not only through hands-on development but also by improving team effectiveness and delivery outcomes. This includes pursuing continuous self-improvement, fostering innovation, and promoting best practices to enhance productivity and software quality. You are encouraged to contribute beyond formal responsibilities, demonstrating initiative and creativity within a dynamic and entrepreneurial environment. The role operates within a collaborative and professional technology team focused on delivering secure, reliable, and high-performing payments processing solutions. The emphasis is on structured, timely delivery of high-quality technology outcomes that meet or exceed company standards. Responsibilities Key Responsibilities: Design, develop, and maintain robust applications using C# and the .NET/.NET Core platform. Build and enhance APIs and services using ASP.NET Core (Web API, MVC). Prepare and maintain documentation of applications and systems. Maintain and continuously improve code quality and optimize application performance, collaborating with the Quality Assurance team to support efficient and effective testing. Contribute to architectural design discussions and influence system design decisions to ensure scalability, resilience, and maintainability. Lead the end-to-end software development lifecycle (design, development, testing, and deployment). Mentor and guide team members and review code to ensure adherence to best practices. Collaborate with product managers and other stakeholders to communicate status, issues, and risks in a timely manner. Deliver outcomes that minimize operational impact and improve the stability of enterprise applications. Ensure applications meet security, data protection, and compliance standards. Promote continuous improvement, innovation, and adoption of emerging technologies, including automation and AI-assisted development tools. Required Skills & Qualifications: Strong proficiency in C# and the .NET / .NET Core ecosystem. Advanced experience with ASP.NET Core, including Web API and MVC frameworks. Strong understanding of object-oriented programming (OOP), RESTful APIs, and microservices architecture within an AWS cloud environment. Experience with relational databases (SQL Server) and event-driven messaging platforms including Amazon SQS and EventBridge. Experience with build and dependency tools such as MSBuild and NuGet. Familiarity with CI/CD pipelines, Git-based workflows, and DevOps practices. Exposure to automation and AI development workflows, including modern coding assistants and tooling. Experience Requirements: Computer Science degree or equivalent practical experience. 6-7 years of professional software development experience. Proven experience building scalable, distributed systems. Experience in payments or parking industry will be highly desirable. Qualifications Optional Desired Qualities: Strong problem-solving and analytical skills. Experience in performance tuning and optimization. Familiarity with test-driven development (TDD), using frameworks such as xUnit, NUnit or Selenium. Ability to work independently, manage time effectively, and take ownership of deliverables. Experience in preparing and maintaining application and system documentation. Excellent communication and collaboration skills. If you are passionate about technology, love personal growth and opportunity, come see what TNS is all about! TNS is an equal opportunity employer. TNS evaluates qualified applicants without regard to race, color, religion, gender, national origin, age, sexual orientation, gender identity or expression, protected veteran status, disability/handicap status or any other legally protected characteristic. With employees based in 21 countries around the world, TNS is a leading global provider of data communication and interoperability services to diverse industries, such as retail, banking, payment processing, telecommunications and the financial markets. TNS’ services extend to over 60 countries and we deliver mission critical solutions to many Fortune 500 companies. TNS employees play a vital role in the delivery of our services and we recognize them as our most valuable asset. We are proud to offer competitive salaries and benefit packages, and due to the global nature of our business we can offer opportunities to relocate to different locations, if your personal circumstances change. Please take the time to view the job openings on this website and submit an application. You are welcome to apply for multiple opportunities and our system is designed to keep you informed on your application status. What’s the next step in your career? Find out today!

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