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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Software Engineer II - **Company:** ONE STOP COLLECTIBLE CORP - **Location:** United States (Remote available) - **Experience:** Experienced - **Contract:** Permanent contract - **Skills:** ASP.NET, .NET Framework, Application Programming Interfaces (APIs), Amazon Web Services, Android Software Development, Microsoft Azure, Configuration Management, Software Debugging, Payment Systems, Firmware, Payment Service Provider, PCI Data Security Standards, Regression Testing, Software Engineering, Systems Integration, Tokenization, Backend, Kotlin, Deployment Automation, Restful APIs, Webhooks, Api Management, Google Pay - **Published:** September 4, 2026 - **Apply:** https://startup.jobs/software-engineer-ii-card-not-present-ebizcharge-9100466 ## About the Role * 2-4 years of professional software development experience * Experience working on payment systems, financial systems, or API integrations * Experience building RESTful APIs using .NET / ASP.NET core * Experience developing Android applications using Kotlin * Understanding of the payment transaction lifecycle (authorization through settlement) * Strong debugging and problem-solving skills in production environments * Ability to work collaboratively in cross-functional teams Preferred Qualifications * Exposure to EMV Level 3 certification processes * Experience integrating with payment processors or gateways * Experience with Ingenico devices and SDKs * Familiarity with PCI-DSS compliance concepts * Experience with AWS or Azure * Experience with CI/CD pipelines and automated deployments * Prior fintech or payment industry experience Technical Environment * Terminal Software: Ingenico SDK, Kotlin * Backend: .NET 6+ / ASP.NET Core * Mobile: Android SDK integration (Kotlin) * Cloud: AWS or Azure * Payments: EMV, Tokenization, Webhooks, Batch Settlement Growth Opportunity This role provides hands-on experience with EMV Level 3 certification, processor integrations, and tokenized payment systems, offering a strong growth path toward senior payments engineering roles. Job Type: Full-time ## Description EMV Terminal & Device Development * Develop and maintain Ingenico terminal applications using Kotlin and Ingenico SDK * Implement EMV transaction flows (contact, contactless, NFC, wallet) * Integrate terminal software with host systems and gateway APIs * Troubleshoot device-level issues, EMV kernel interactions, and transaction failures * Assist with firmware updates and terminal configuration management Backend Payment Services (.NET) * Contribute to the development of secure RESTful APIs using .NET/ASPE.NET core * Implement core payment workflows: authorization, capture, refund, void, and settlement * Support integrations with payment processors and gateways * Build and maintain device management services (registration, monitoring, configuration) * Implement webhook listeners and event-driven payment updates * Support batch settlement, reconciliation, and reporting processes * Participate in production troubleshooting and reliability improvements EMV Certification & Processor Integration * Contribute to EMV Level 3 certification efforts by executing test cases and validating transaction flows * Assist in validating host message formatting and transaction responses * Troubleshoot processor-level declines and edge cases with guidance from senior engineers * Support regression testing and re-certification activities * Collaborate with internal teams and external processors during certification cycles Tokenization & Wallet Integration * Support implementation of network tokenization flows (Visa, Mastercard, Amex) * Assist with token lifecycle management (provisioning, updates, de-tokenization) * Support integrations for Apple Pay and Google Pay * Ensure payment flows adhere to card network and security requirements Mobile Payment Integration * Support Android-based mobile payment integrations using Kotlin * Integrate payment SDKs and troubleshoot mobile transaction issues * Assist with mobile wallet provisioning and transaction flows ## Related Videos - [APIs and Architecture for scaling omnichannel payments](https://www.wearedevelopers.com/videos/90-apis-and-architecture-for-scaling-omnichannel-payments) - [Developing the Backend with Stefan Lingler, CTO at Shpock](https://www.wearedevelopers.com/videos/100360-developing-the-backend-with-stefan-lingler-cto-at-shpock) - [Building Multi-Tenant ASP.NET Core Applications: Best Practices and Real-World Solutions](https://www.wearedevelopers.com/videos/1552-building-multi-tenant-asp-net-core-applications-best-practices-and-real-world-solutions) - [Kotlin Multiplatform - True power of native code reuse](https://www.wearedevelopers.com/videos/4-kotlin-multiplatform-true-power-of-native-code-reuse) - [Migrating half a million users to a new payment service provider](https://www.wearedevelopers.com/videos/730-migrating-half-a-million-users-to-a-new-payment-service-provider) - [Nest.js - TypeScript in the backend can also be clean](https://www.wearedevelopers.com/videos/1033-nest-js-typescript-in-the-backend-can-also-be-clean) ## Related Articles - [Highest Paying Tech Companies in Europe](https://www.wearedevelopers.com/magazine/162-highest-paying-tech-companies-in-europe) - [Highest Paying Tech Companies for Developers](https://www.wearedevelopers.com/magazine/220-highest-paying-tech-companies-for-developers) - [Fully Remote Software Engineer Jobs](https://www.wearedevelopers.com/magazine/447-fully-remote-software-engineer-jobs) - [Best Paying Jobs in Technology](https://www.wearedevelopers.com/magazine/256-best-paying-jobs-in-technology) - [Top-Paying Tech Jobs (with Salaries)](https://www.wearedevelopers.com/magazine/372-top-paying-tech-jobs-with-salaries) - [Fullstack developer salary in Germany [2023]](https://www.wearedevelopers.com/magazine/197-fullstack-developer-salary-in-germany-2023)