Payment Systems Engineer

Job Description A large retail company is seeking an experienced Payment Systems Engineer (.NET) with strong .NET/C# expertise for a hybrid role based in Lincolnshire, IL, where candidates are required to work in the Lincolnshire office 2-3 days per week. This role focuses on designing, building, and maintaining secure, high-performance payment platforms by developing reliable transaction processing systems using .NET, C#, and ASP.NET Core, building RESTful APIs and microservices, integrating with payment gateways and banks, ensuring high availability and scalability, implementing PCI DSS compliant secure handling of sensitive payment data, monitoring transaction flows, troubleshooting production issues, and improving reconciliation and settlement processes. The salary expectation for this role is $130k - $140k. We are a company committed to creating diverse and inclusive environments where people can bring their full, authentic selves to work every day. We are an equal opportunity/affirmative action employer that believes everyone matters. Qualified candidates will receive consideration for employment regardless of their race, color, ethnicity, religion, sex (including pregnancy), sexual orientation, gender identity and expression, marital status, national origin, ancestry, genetic factors, age, disability, protected veteran status, military or uniformed service member status, or any other status or characteristic protected by applicable laws, regulations, and ordinances. If you need assistance and/or a reasonable accommodation due to a disability during the application or recruiting process, please send a request to HR@insightglobal.com.

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https://insightglobal.com/workforce-privacy-policy/. Skills and Requirements Strong experience with C#, .NET, and ASP.NET Core for backend development Experience in retail and multi-channel payments (POS, e-commerce, mobile, and alternative payment methods) Hands-on experience building RESTful APIs, microservices, and distributed backend systems Proficiency with relational databases (SQL Server, Oracle, or PostgreSQL) Solid knowledge of secure coding practices, encryption, authentication, and PCI DSS Bachelor's degree in Computer Science, Engineering, or equivalent experience Strong problem-solving and debugging skills for mission-critical systems - Experience with payment processors or gateways (Stripe, Adyen, PayPal, Fiserv, Authorize.net, etc.) Familiarity with cloud platforms (Azure or AWS) and cloud-native .NET applications Knowledge of messaging systems such as Azure Service Bus, RabbitMQ, or Kafka Experience with CI/CD pipelines and DevOps practices Background in fintech or financial services Familiarity with SOX or other financial compliance standards