Summary
✨ AI‑Generated
Lead the design and implementation of secure payment platforms, mastering C#/.NET and financial integration standards in a high‑stakes environment.
Highlights
Expert level role focusing on financial transactions, payment security, and building robust backend systems for fintech.
Description
C#/.NET | Payments & Core Financial Systems
Position Overview
CruwX is seeking a hands-on Senior Backend Engineer to participate in the development, integration, and support of mission-critical financial and payment platforms.
This is a highly technical, code-writing role focused on building backend financial systems and payment integrations.
We are looking for a senior C#/.NET engineer with authentic payment industry experience—someone who understands transaction lifecycles, core financial messaging, and payment security standards, not an infrastructure-only architect.
Core Requirements
Experience: 8+ years of software development experience, with 5+ years in fintech, banking, payment processing, or remittances.Technical Stack: Advanced hands-on experience with C# / .NET Core (.NET 8) and enterprise-grade distributed architectures.APIs & Enterprise Integrations: Deep expertise building, securing, and consuming robust REST & SOAP APIs.
Proficient in financial integration standards and authentication protocols (OAuth 2.0, JWT, Mutual TLS, HMAC Authentication) to connect with banks, processors, and core networks.Core Payments Knowledge: Deep understanding of real-time transaction lifecycles (authorizations, routing, reversals, settlement, clearing, and reconciliation).Financial Messaging Standards: Hands-on experience or familiarity with ISO 8583 (over TCP/IP sockets) and/or ISO 20022 (PACS, CAMT, PAIN).Integrations & Gateways: Proven track record integrating, certifying, or supporting Payment Processors, Card Networks, Merchant Acquirers, or Core Banking Systems.Payment Security & Compliance: Practical understanding of PCI DSS standards, secure coding practices, and payment encryption (HSMs, cryptographic key management, PIN encryption, or EMV).Production Operations: Comfortable troubleshooting critical production issues, analyzing system logs, and supporting stable deployments.Languages: Professional fluency in both English and Spanish.
Highly Desirable
Database Management: Strong proficiency in Microsoft SQL Server development, query optimization, or advanced administration (AlwaysOn, replication).Cloud Infrastructure: Experience deploying and managing workloads on AWS.Digital Assets & Tokenization: Experience in digital asset integration (wallets, stablecoins, custody, or external exchange rails like Coinbase).
