Senior .NET Backend Engineer — Banking Platform

TEAM International Services; España; On-site; EUR 60,000 - 90,000; Full time

Benefits offered by this job

Flexible engagement model

Global IT talent

Modern tech stacks

Security compliance

People-first culture

23 days PTO

Job summary

TEAM International Services in Spain is seeking a Backend Engineer to join our banking platform team. You will build production-grade backend services in C# / .NET, focusing on correctness, reliability, auditability, and maintainability.

The role involves designing APIs, working with SQL databases, applying clean architecture, and writing unit and integration tests. You will collaborate across product, operations, QA, and other engineers to deliver reliable financial solutions.

Qualifications

• Solid C# / .NET backend experience.
• Good understanding of REST APIs, SQL, and service-based architecture.
• Experience with testing, CI/CD, and code reviews.
• Awareness of messaging, retries, idempotency, concurrency, and transactional boundaries.
• Ability to reason through ambiguous requirements and identify edge cases.
• Strong ownership mindset: you care about what happens after the code is deployed.
• Experience with RabbitMQ, Redis, Azure/AWS, Docker, observability tools, or financial systems is a plus.

Responsibilities

• Build and maintain backend services using C#, .NET, and ASP.NET Core.
• Design APIs, background workers, and message-driven workflows.
• Work with SQL databases, Entity Framework, and performance-sensitive data access.
• Apply clean architecture principles across use cases, domain logic, repositories, and infrastructure.
• Write meaningful unit and integration tests.
• Support production systems with good logging, monitoring, and failure handling.
• Collaborate with product, operations, QA, and other engineers to clarify requirements and deliver reliable solutions.

Skills

C# / .NET

REST APIs

SQL

Service-based architecture

Testing

CI/CD

Code reviews

Messaging

Retries

Idempotency

Concurrency

Transactions

Edge cases

Ownership

RabbitMQ

Redis

Azure/AWS

Docker

Observability

Financial systems

Tools

Docker

RabbitMQ

Redis

Azure

AWS

Job description

TEAM International Services in Spain is seeking a Backend Engineer to join our banking platform team. You will build production-grade backend services in C# / .NET, focusing on correctness, reliability, auditability, and maintainability.

The role involves designing APIs, working with SQL databases, applying clean architecture, and writing unit and integration tests. You will collaborate across product, operations, QA, and other engineers to deliver reliable financial solutions.