Senior Fullstack (.NET/Python) Engineer

Jimmy Technologies; Województwo mazowieckie; Remote; PLN 396,000 - 528,000; Full time

Job summary

Jimmy Technologies is seeking a Senior Fullstack Engineer (.NET/Python) to join a consultancy serving banks and insurers on AI, automation and analytics focused on Anti-Financial Crime.

You will work remotely within the EU on middleware APIs, C#/.NET and Python, with responsibilities across integration, testing, and deployment in CI/CD pipelines.

Qualifications

• Proficiency in C#/.NET and Python for building APIs and services.
• Experience with enterprise integrations and REST/messaging patterns.
• Strong analytical, communication, and ownership capabilities.

Responsibilities

• Develop middleware APIs between Salesforce / API management, Databricks or SQL databases, and legacy cores.
• Build and harden the Agentic CDD services: asynchronous client-check API with callback, retries instead of dropped messages, and safe write-back with an on/off switch.
• Extend the Python capability modules and the connector framework.
• Package and deploy as containers or Databricks bundles through the CI/CD pipeline.
• Write unit and integration tests, and fix issues found in testing and in production.

Skills

C# / .NET

Python

API integration

Job description

We are looking for a Senior Fullstack Engineer (.NET/Python) for our client, a consultancy that helps banks and insurers transform their operations through AI, automation, and advanced analytics, with a strong focus on Anti-Financial Crime (fraud prevention, AML, KYC) and enterprise AI platforms . You will join their delivery for a Dutch insurance client.

This is a long-term, remote-first contract position for candidates based in the EU.

Responsibilities

• Build the middleware APIs between Salesforce / API management, Databricks or SQL databases, and legacy cores such as AS400.
• Build and harden the Agentic CDD services: asynchronous client-check API with callback, retries instead of dropped messages, and safe write-back with an on/off switch.
• Extend the Python capability modules and the connector framework.
• Package and deploy as containers or Databricks bundles through the CI/CD pipeline.
• Write unit and integration tests, and fix issues found in testing and in production.

Work Conditions

• Start Date: ASAP
• Location: Remote within the EU
• Long-term contract-based role: until July 2027 with possible extension
• Contract with EU LCC

Job Requirements

Core Technical Skills

• C# / .NET ( ASP.NET Core Web APIs)
• Python (FastAPI or similar)
• Integration with enterprise systems (REST, messaging/queues)

Soft Skills

• Strong analytical and problem-solving skills , with the ability to diagnose and resolve complex issues under pressure.
• Excellent communication skills , capable of explaining technical concepts to both technical and non-technical stakeholders.
• Ownership mindset – the ability to work independently and as part of a team while taking full responsibility for assigned tasks.
• Proactive attitude – the ability to escalat e issues early, follow up on blockers, and support teammates when needed.
• Constructive feedback approach – ability to receive and provide feedback in a way that improves overall team performance.