Senior Software Engineer (C# .NET) Payments & Financial Infrastructure (Remote) A fast-scaling global payments infrastructure company is building the financial rails that move real money across borders at speed, at scale, and with zero tolerance for failure. The platform powers cross-border transactions for SMEs and enterprises using a blend of traditional banking networks and stablecoin-backed blockchain rails. Transaction sizes are meaningful. The systems are live. The consequences are real. The engineering team is distributed, lean, and fast-moving. Decisions are made quickly. Priorities shift. External partners change things without warning. The expectation is simple: build systems that hold up in the real world. This is not a “feature factory” role. This is financial infrastructure. They are now hiring a Senior Software Engineer (C# .NET) to play a key role in shaping and stabilising their backend payments platform. The Role (What You’re Really Signing Up For) As a Senior Software Engineer, you’ll own and evolve critical backend services that sit directly in the path of money movement. You’ll: Design and build API-driven services that process real payments Integrate with banks, payment providers, identity platforms, and blockchain rails Balance speed vs safety, often with incomplete information Take responsibility when things go wrong not just when they go right This role suits someone who has already worked in regulated, high-risk systems and understands that elegance matters less than reliability. What You’ll Be Doing Backend & API Engineering Design and build secure, scalable APIs in .NET 8 / C#, powering payment and stablecoin transactions Own backend services end-to-end — from design through production support Build background processing, scheduled jobs, and webhook-driven workflows Integrate with third-party payment, banking, KYC and identity providers Payments, Crypto & Real-World Complexity Implement logic that touches real money, not test data Build and maintain integrations across traditional rails and blockchain-backed stablecoin flows Create mock services and defensive layers for partners without stable test environments Design systems that expect breaking changes outside your control Security, Risk & Compliance (By Design) Implement secure API patterns: authentication, encryption, auditing and monitoring Treat financial data with the caution it deserves Build systems that work within regulatory and compliance constraints rather than fighting them Cloud, Infrastructure & Reliability Deploy and operate services on AWS (Lambda, EC2, DynamoDB, S3) Collaborate closely with DevOps on CI/CD pipelines (GitHub Actions) Build containerised services (Docker) designed for scalability and resilience Monitor production systems using tools like DataDog, catching issues early Team & Ways of Working Work closely with product and engineering to convert evolving requirements into stable systems Review code, raise the bar, and challenge risky assumptions Be comfortable with context-switching between BAU stabilisation and new feature work Communicate clearly in a fully remote, distributed team The Technical Stack Backend: .NET 8, C#, EF Core, Hangfire, RestEase, NUnit Data: PostgreSQL, DynamoDB Infrastructure: AWS, Docker, GitHub Actions Auth & Observability: Auth0, DataDog Domain: Payments, identity verification, banking partners, stablecoin rails Who This Role Is Really For You’ll Likely Thrive If You: Have 5 years of building production backend systems in C# .NET Have worked in fintech, banking, payments, or regulated environments Understand that money is risk, not just data Are calm under pressure and methodical when things break Can operate without perfect specs or stable third parties Take ownership instead of waiting for instructions Prefer reliability and clarity over shiny greenfield builds This Role Is Probably Not for You If You: Need everything fully specified before you start Prefer slow, linear delivery cycles Avoid BAU, optimisation, or legacy improvement work Get frustrated by external dependencies you don’t control Are uncomfortable dealing with production responsibility (Both kinds of engineers are good — just not for this role.) Nice-to-Haves (Not Deal Breakers) Experience with blockchain or stablecoin-based payment flows Hands-on use of DataDog for logs, metrics, and alerting Familiarity with Auth0 or similar auth providers Experience building integration-heavy systems with multiple external APIs Exposure to financial compliance or regulated domains What Makes This Worthwhile Real ownership: You’ll work on systems that matter, not internal tooling nobody uses High impact: Your decisions directly affect real-world payments and customers Fast growth: Early-stage scale means fast learning and expanding responsibility Distributed team: Remote-first, pragmatic, outcome-focused Meaningful work: You’re enabling faster, more accessible financial infrastructure globally Final Note This environment rewards engineers who are: Thoughtful Cautious Accountable Comfortable with ambiguity It is not about being the loudest or fastest, It’s about building systems that don’t break when it matters most .