6 beste Stellen als system engineer it security in wien, w – aktuell auf Personalsuche

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Senior C#.NET Developer
Cryptonow —Wien, W
Review and critically evaluate AI-generated code for correctness, security, and business-logic accuracy before it ships. Design, build, and maintain C#.
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system engineer it security jobs near wien, w

Senior C#.NET Developer

Cryptonow
Wien, W

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Details zur Stelle

Vollzeit

Vollständige Stellenbeschreibung

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.
Interest in working from the office once a week.

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.

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