Senior .NET Developer

As a Senior .NET Developer, you will work at the core. You will design, build and optimise backend services that handle business-critical financial processes and high transaction volumes.

You will take technical ownership, contribute to architectural decisions, and support clients in migrating data from their existing platforms.

What will you do

  • Design and further develop scalable backend services using .NET Core (C#)

  • Build and maintain robust RESTful APIs and background services

  • Work on complex integrations with payment service providers, KYC/KYB providers, and external APIs

  • Contribute to event-driven and asynchronous architectures

  • Ensure high standards in security, performance, and reliability

  • Work closely with the CTO and development team

  • Mentor junior developers and participate in code reviews and architectural discussions

What do you bring

  • 5+ years of professional experience with .NET / C#

  • Strong experience with .NET Core, Web APIs, and backend architecture

  • Solid knowledge of SQL Server and data modelling

  • Experience with cloud platforms (preferably Microsoft Azure)

  • Good understanding of security principles (authentication, authorisation, and data protection)

  • Experience in fintech, payments, or regulated environments is a strong advantage

  • You write clean, maintainable code and think beyond implementation alone

  • You enjoy supporting clients during migration projects

  • You have a hands-on mentality and thrive in a dynamic, agile fintech start-up environment

What we offer

  • A senior role with genuine architectural impact

  • The opportunity to work on a business-critical fintech platform

  • A fast-growing SaaS start-up with short decision-making lines

  • A competitive salary, career growth opportunities, 25 days of annual leave, and extensive training and development opportunities

  • A high level of autonomy and ownership

Why Fininly?

You are not simply building software. You are building the infrastructure that enables modern investing and alternative finance across Europe, helping to democratise the financial market.

Benefits

  • Professional development budget

  • Travel allowance

Employment type: Full-time
Work location: On-site
Salary indication: €3,967.56 – €6,423.07 per month

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