Senior Backend Architect: Python/C# for Smart Quote Engine

Expereo International; Barcelona; Hybrid; EUR 55,000 - 75,000; Full time

Benefits offered by this job

Hybrid Working

Pension Plan

25 Days Holidays

Job summary

Expereo International is seeking a Backend Developer to join the Supplier onboarding and Quote Management teams. You will work on the core platform, writing Python and/or .NET, building services, and implementing a constraint optimization engine for quotes.

You will integrate partner data, maintain internal tools, and ensure auditable, explainable outputs for commercial stakeholders. The role sits at the intersection of algorithmic implementation, API design, and engineering discipline.

Qualifications

• Advanced Python development with clean, tested code.
• Experience designing REST APIs with clear contracts and versioning.
• Strong software engineering practices and code reviews.
• Ability to work in a mixed Python/C# codebase.
• Familiarity with AWS services and OpenAPI tooling.

Responsibilities

• Implement business logic for quote engine and integrations.
• Design and maintain API contracts and documentation.
• Refactor code, write tests, and ensure production readiness.
• Collaborate with commercial and platform teams and participate in sprint reviews.

Skills

Advanced Python

API design

Software engineering

Multi-language codebase (Python/C#)

C# knowledge

Tools

AWS (Lambda, API Gateway, S3)

OpenAPI/Swagger

Pydantic

CI pipelines

Python packaging

Job description

Expereo International is seeking a Backend Developer to join the Supplier onboarding and Quote Management teams. You will work on the core platform, writing Python and/or .NET, building services, and implementing a constraint optimization engine for quotes.

You will integrate partner data, maintain internal tools, and ensure auditable, explainable outputs for commercial stakeholders. The role sits at the intersection of algorithmic implementation, API design, and engineering discipline.