Backend .NET Developer

Title: Backend .NET Developer

Location: Paris, France (Hybrid)

Employment Contract.

Job Description:

Mandatory skills:

• C# .NET 10 & Web API

• MS SQL

Desired skills:

• C# .NET 10 & Web API

• MS SQL

• Microsoft Dependency Injection

• Dapper

• xUnit

• Moq

• Postman

• Strong understanding of payment flows:

o CIT / MIT

o 3DS

o retries

o idempotence

• Messaging systems (Kafka or equivalent)

• CI/CD, GitLab

• Cloud (Azure), especially Azure Container Apps (ACA)

• Observability tools (Datadog)

Responsibilities:

• Participating in team rituals and collective craftsmanship
• (Daily Scrum Meetings, Poker Planning, Sprint Planning, Demos, etc.)
• Designing and developing various payment modules, including:
• payment method eligibility
• connectivity with multiple payment partners
• monetary transaction management
• Designing, developing, and maintaining robust payment APIs
• Contributing to card (CB), wallet, and PSP flows:
• authorization
• capture
• refund
• 3‑D Secure (3DS)
• Improving the resilience, performance, and quality of the payment information system
• Implementing unit tests
• Documenting the developed APIs
• Leveraging craftsmanship expertise and AI usage to improve time‑to‑market