Haystack
← Back to Jobs
Technology

.net Senior developer

SLK America Inc.Wilmington, DE🇺🇸United StatesPosted 16 Jul 2026

Quick Overview

Work Type
Hybrid
Level
Mid Senior

Job Description

Senior .NET Full Stack Developer emphasizing backend for platform integrations and payments processing in our core banking systems. You''ll drive secure, scalable solutions for transaction workflows, third-party gateways, and regulatory-compliant payment platforms.

Key Responsibilities

  • Develop backend services in .NET Core/8+ for payments processing, including ISO 20022/SWIFT message handling, real-time rails (FPS, RTP), and full lifecycle from initiation to settlement/reconciliation.
  • Integrate platforms with bank APIs, third-party gateways (e.g., Visa, ACH), SFTP/XML/JSON feeds, and microservices using ASP.NET API, gRPC, and queues like RabbitMQ.
  • Contribute full stack with Angular/React frontends for payment dashboards, while optimizing SQL Server/NoSQL for high-volume financial data and ensuring PCI-DSS compliance.
  • Manage CI/CD via Azure DevOps, Docker/Kubernetes deployments, performance tuning, and monitoring with Application Insights for production stability.
  • Lead code reviews, agile collaboration with fintech teams, and troubleshooting for payments and integration issues.

Required Qualifications

  • 8+ years .NET backend experience, including 4+ years in payments/integration (ISO 20022, SWIFT MT/MX, SEPA, Open Banking).
  • Expertise in C#, async APIs, Entity Framework, secure auth (OAuth/JWT), and cloud (Azure/AWS) for scalable financial apps.
  • Strong SQL, message processing, error handling, and regulated environments; full stack basics (Angular/TypeScript).

Preferred Skills

  • Banking payments (ACH, wire, RTP), event sourcing, and DevOps tools (Terraform, ELK).
  • Certifications: Microsoft Azure Developer Associate.

Skills

Docker
Microservices
SQL
SQL Server
Swift
AWS
ELK
OAuth
Agile
Angular
Azure
C#
.NET
ASP.NET
JWT
Kubernetes
RabbitMQ
Rails
React
Terraform
TypeScript
gRPC

Similar jobs