Payment, ERP, CRM, SMS and third-party API integration (C# / Node.js)
I integrate your application with payment institutions, ERP/CRM systems, SMS operators and other third-party services in a secure and resilient way.
What's included:
• Integration analysis and technical design (data flow, error scenarios)
• An integration service in C# (.NET Core) or Node.js, or an addition to your existing backend
• REST, SOAP and webhook integrations
• Resilience with retry, circuit breaker and rate limiting (Polly)
• High-volume sending with queues and throttling
• API key management, JWT/OAuth2 authentication
• Logging, error tracking and reconciliation reports
• Technical documentation
Experience: A .NET Core platform carrying about 4 billion SMS per year with Turkcell, Vodafone and Türk Telekom operator integrations, reconciliation and virtual POS modules for a payment institution, an electricity sales platform integrated with EPİAŞ, Microsoft Dynamics CRM integrations, Google Workspace API.
Duration and price: My daily rate is 15,000-20,000 TL. The starting price is for a single integration of about 10 working days. Once the number of integrations and the other side's API are clear, we put the total duration and price in writing.
What I expect from you: the other side's API documentation, test environment access and keys.
What's included:
• Integration analysis and technical design (data flow, error scenarios)
• An integration service in C# (.NET Core) or Node.js, or an addition to your existing backend
• REST, SOAP and webhook integrations
• Resilience with retry, circuit breaker and rate limiting (Polly)
• High-volume sending with queues and throttling
• API key management, JWT/OAuth2 authentication
• Logging, error tracking and reconciliation reports
• Technical documentation
Experience: A .NET Core platform carrying about 4 billion SMS per year with Turkcell, Vodafone and Türk Telekom operator integrations, reconciliation and virtual POS modules for a payment institution, an electricity sales platform integrated with EPİAŞ, Microsoft Dynamics CRM integrations, Google Workspace API.
Duration and price: My daily rate is 15,000-20,000 TL. The starting price is for a single integration of about 10 working days. Once the number of integrations and the other side's API are clear, we put the total duration and price in writing.
What I expect from you: the other side's API documentation, test environment access and keys.
Stages of the work
Each stage is approved when delivered, and that stage's share is paid directly to the expert.
- Analysis and technical design · %25 — Data flow, error scenarios and an integration design document
- Development and verification in the test environment · %50 — A working integration, test scenarios and sample transactions
- Going live and documentation · %25 — Production cutover, monitoring and technical documentation