C# Developer - Fixed Income e-Trading Front Office

Modders Consulting; Singapore; Hybrid; SGD 102,000 - 160,000; Full time

Job summary

Modders Consulting in Paris is seeking a skilled C# developer to work on a Fixed Income e-trading platform used by traders. You will contribute to real-time pricing, RFQ/RFS, and auto-quoting within a high-performance, industrialised environment.

The role offers a clear learning curve on front-office topics, performance optimization, and a migration path from .NET Framework to modern .NET versions, with professional English required and a strong emphasis on code quality and reliability.

Qualifications

• C# developer with at least three years of experience.
• Exposure to front-office or pricing/e-trading is a plus.
• Interest in real-time systems, performance and critical applications.
• Professional English is required.

Responsibilities

• Develop and evolve the interest rate swap pricing engine.
• Implement workflows: pricing, quoting, execution, booking, monitoring.
• Build the RFQ and RFS modules with auto-quoting mechanisms.
• Integrate market data feeds and contribute prices to internal systems.
• Price validation, anomaly detection and auditability improvements.
• Improve latency-sensitive components on a high-performance messaging bus.
• Migrate from .NET Framework to modern .NET versions.

Skills

C#

Real-time systems

Performance tuning

Professional English

Tools

.NET Framework

.NET 8

WPF

MVVM

Solace PubSub+

NUnit

Appium

Azure DevOps

SonarQube

Job description

A Fixed Income electronic trading platform used daily by traders: real-time pricing, RFQ, execution, with genuine front office skills development.

• Paris / Île-de-France
• Permanent contract
• 3+ years of experience
• Capital markets

An e-trading platform used by traders

The team builds and evolves a strategic Fixed Income electronic trading platform within an international investment bank. It covers the full pre-trade front office chain: real-time pricing, RFQ and RFS, auto-quoting, electronic execution, STP booking and post-trade monitoring.

The constraints are those of a market-facing application: performance, reliability, auditability and software quality.

From pricing to execution, with a real learning curve

• Developing and evolving the interest rate swap pricing engine.
• Implementing business workflows: pricing, quoting, execution, booking, monitoring.
• Building the RFQ and RFS modules along with auto-quoting mechanisms.
• Integrating market data feeds and contributing prices to internal and external order books.
• Price validation and consistency modules: anomaly detection, automatic fallback, auditability.
• Optimising latency-sensitive components over a high-performance messaging bus.
• Contributing to the migration from .NET Framework to modern .NET versions.

Technical environment

• C#
• .NET Framework and .NET 8
• WPF / MVVM
• Solace PubSub+
• Market data
• NUnit
• Appium
• TDD
• Azure DevOps
• SonarQube

The context is heavily industrialised: automated testing, continuous integration, progressive deployments.

Who we are looking for

• C# developer with at least three years of experience.
• Initial exposure to the front office or to pricing and e-trading applications is an advantage.
• Failing that, a clear interest in real-time systems, performance and critical applications.
• A wish to understand the front office business and the effect of code in production.
• Professional English.

Why this role is worth your time

• It is a genuine entry point into the front office, on a pre-trade topic where performance matters.
• The application is used daily by traders: feedback is immediate.
• Skills development is progressive and supported, on e-trading, pricing and .NET performance.
• You get the full technical context before any interview with the client.