Senior C# .NET Developer (Financial Markets / Risk Platform) (41662)

DeARX; Johannesburg; On-site; ZAR 300,000 - 400,000; Full time

Job summary

A leading company in financial technology is seeking a Senior C# .NET Engineer to join their specialized team. You will develop robust trading and risk platforms that impact global markets, ensuring high performance, reliability, and clean architecture. This role offers an opportunity to directly influence financial operations while working alongside skilled engineers in a collaborative environment focused on innovation.

Qualifications

• 7+ years of professional C# .NET development experience.
• Mastery of object-oriented design and SOLID principles.
• Experience with RESTful APIs, microservices, and distributed systems.

Responsibilities

• Build pricing & risk engines used by trading desks and risk officers.
• Develop high-performance microservices and REST APIs.
• Implement cloud migrations to AWS.

Skills

C# .NET Development

Object-oriented Design

RESTful APIs

Microservices

DevOps Automation

Agile Development

Problem-solving

Job description

Senior C# .NET Engineer Build Trading & Risk Platforms for Global Markets

Location: Sandton, Johannesburg (On-site)
Contract:6 months (strong chance of renewal / long-term engagement)
Level: Senior / Specialist

Be part of something bigger.

We're hiring an exceptional Senior C# .NET Engineer to join a highly specialized team building a world-class trading, pricing, and risk platform for global markets. This is a chance to build real-time systems that power trading desks, market risk, and credit teams systems where performance, reliability, and precision matter.

If you're passionate about complex problem-solving, clean architecture, and seeing your code directly impact global financial markets, this role was built for you.

What you'll be building:

• Pricing & risk engines used by trading desks and risk officers

• High-performance microservices, REST APIs, and distributed systems

• Client applications (WPF), web portals (Blazor), and Excel DNA integrations

• Cloud migrations to AWS (were scaling fast)

• Complex scheduling, orchestration, monitoring, and alerting systems

Why this role is different:

• Direct impact: What you build gets used daily by market makers, traders & risk managers.

• High autonomy: Youll be part of a senior, collaborative team where your input shapes architecture & design.

• Real complexity: Large-scale, real-time financial data systems with millions of calculations daily.

• Cutting-edge stack: C# .NET 8, Blazor, WPF, REST APIs, AWS, DevOps pipelines, TDD.

• Elite environment: Surrounded by sharp, like-minded engineers passionate about clean code, elegant design, and systems that just work.

What we're looking for:

• 7+ years of professional C# .NET development experience.

• Mastery of object-oriented design, SOLID principles, and design patterns.

• Strong experience with RESTful APIs, microservices, and distributed systems.

• Skilled with DevOps automation, CI/CD pipelines, and monitoring.

• Excellent problem-solving skills and attention to detail.

• Comfortable working directly with business stakeholders to shape solutions.

• Agile development experience.

Bonus points if you have:

• Financial services / trading / risk system experience

• AWS experience (migrations, serverless, compute scaling)

• Messaging protocols (Kafka, RabbitMQ)

• Excel DNA (or Excel Add-ins development)

Sample screening questions we may explore:

• Explain SOLID principles in your own words.

• How would you design an immutable system in C#?

• Describe how you use generics effectively in .NET.

You build the system. The system drives the market.

Ready to engineer software that actually powers financial markets? Apply today or email me [e-mail]

PLEASE NOTE MUST BE SA Citizens or have valid critical skills permit in own name