Senior C#.NET Developer

Cryptonow; Wien; Hybrid; EUR 90.000 - 130.000; Vollzeit

Benefits dieser Stelle

Ownership over architecture

Vienna or Baar office

Hybrid work

Competitive pay

Growth opportunities

Zusammenfassung

Cryptonow is seeking an experienced C#.NET developer to own critical architecture and business logic for our brokerage and voucher card platforms. You’ll translate complex regulatory and financial requirements into robust, maintainable systems, using AI as a multiplier while preserving human judgment.

You’ll collaborate with product, compliance, and other engineers to ensure scalable, secure, and EU-compliant solutions, with hybrid work from Vienna or Baar and a strong focus on quality and

Qualifikationen

• 5+ years of professional C#.NET development with ASP.NET Core and Blazor.
• Experience designing and maintaining complex business-critical systems.
• Strong databases knowledge (SQL Server or PostgreSQL) and REST API design.
• Cloud infrastructure experience, preferably AWS, and familiarity with fintech/crypto contexts.
• Ability to evaluate AI-generated code and ensure regulatory and financial accuracy.
• Excellent communication skills and fluency in English (German a plus).

Aufgaben

• Design, build, and maintain C#.NET applications powering our brokerage and voucher card platforms.
• Translate regulatory and business requirements into robust technical designs.
• Leverage AI coding tools while owning code quality, architecture decisions, and edge-case handling.
• Review AI-generated code for correctness, security, and business logic.
• Architect and maintain integrations with external partners, payment providers, and crypto infrastructure.
• Identify performance, security, and scalability risks and design proactive solutions.
• Mentor developers on technical best practices and responsible AI tooling.
• Collaborate with product and compliance to meet EU regulatory standards.
• Write clean, well-documented, testable code and participate in code reviews and planning.

Kenntnisse

C#.NET

ASP.NET Core

Blazor

Clean Architecture

Architecture

Databases

REST API

AWS

AI tools

Tools

SQL Server

PostgreSQL

REST APIs

AWS

Jobbeschreibung

About Us

We are dedicated to making crypto easy and accessible for everyone. Our unique product offerings, including the European Cryptonow Brokerage Platform and Crypto Voucher Cards, have positioned us as pioneers in the industry since 2017. Cryptonow obtained the MiCAR licence by the FMA (Financial Market Authority), ensuring compliance with the highest EU regulatory standards. With offices in Austria and Switzerland — right in the heart of "Crypto Valley" — we are looking for an experienced C#.NET Developer to help build and scale the systems powering our brokerage and voucher card platforms.

Role Overview

We build software with AI as a core part of our workflow — but our business logic (regulatory compliance, financial transactions, multi-partner integrations, real-time crypto settlement) is genuinely complex. That's exactly why this role isn't about typing code. We need someone who can direct AI tools effectively, but who has the seniority to catch what they get wrong, question the "obvious" solution, and design systems that actually hold up under regulatory and financial scrutiny.

You’ll own the architecture and business logic behind critical parts of our platform, working closely with product, compliance, and other engineers to translate complex financial and regulatory requirements into robust, maintainable C#.NET systems — using AI as a force multiplier, not a substitute for judgment.

Key Responsibilities

• Design, build, and maintain C#.NET applications and services powering our brokerage platform and voucher card systems.
• Translate complex business and regulatory requirements (MiCAR, financial transaction flows, partner integrations) into clear technical designs.
• Use AI coding tools to accelerate development — while owning code quality, architecture decisions, and edge-case handling that AI tools routinely miss.
• Review and critically evaluate AI-generated code for correctness, security, and business-logic accuracy before it ships.
• Architect and maintain integrations with external partners, payment providers, and blockchain/crypto infrastructure.
• Identify performance bottlenecks, security risks, and scalability issues, and design solutions proactively.
• Mentor other developers on both technical best practices and effective, responsible use of AI tooling.
• Collaborate closely with product owners and compliance stakeholders to ensure systems meet EU regulatory standards.
• Write and maintain clean, well-documented, testable code and champion good engineering practices across the team.
• Participate in code reviews, architecture discussions, and sprint planning.

Qualifications

• 5+ years of professional experience in C#.NET development ( ASP.NET Core, .NET 9/10, Blazor), with a strong grasp of OOP and clean architecture principles.
• Proven experience designing and maintaining complex, business-critical systems — not just CRUD apps.
• Solid understanding of databases (SQL Server, PostgreSQL, or similar), API design (REST), and cloud infrastructure (AWS preferred).
• Comfortable using AI coding assistants daily, with the seniority to know when to trust them and when to override them.
• Strong analytical skills and the ability to deeply understand business logic, not just implement tickets.
• Experience with fintech, payments, or crypto/blockchain systems is a strong plus.
• Familiarity with security best practices and regulatory considerations in financial software is a plus.
• Excellent communication skills — able to explain technical trade-offs to non-technical stakeholders.
• Fluency in English required; German is a plus.
• Based in or willing to relocate to Vienna or Baar; open to occasional travel between offices.
• Self-driven, detail-oriented, and comfortable owning decisions in a fast-moving environment.

What We Offer

• A key technical role with real ownership over architecture and product direction — not just a seat in a ticket queue.
• Work from our Vienna or Baar office, both based in vibrant, well-connected fintech and crypto hubs.
• Modern engineering culture where AI tools are embraced to remove grunt work, freeing you to focus on the interesting, high-value problems.
• The opportunity to work on cutting-edge crypto and fintech infrastructure at a licensed, regulated, EU-compliant company.
• A collaborative, low-ego team that values judgment and craftsmanship over just "shipping fast."
• Competitive compensation and opportunities for professional growth.
• Flexible/hybrid working arrangements.

If you're a C#.NET developer who's excited about using AI to move faster — but knows that real seniority means understanding the business well enough to know when the AI is wrong — we'd love to hear from you.

Join us in building the future of the financial industry, one well-architected system at a time, from our offices in Vienna or Baar.