Freelancer: Senior C#/.NET Software Engineer | WPF/MVVM | ASP.NET Core/Web API | SQL Server | Performance & Concurrency | Front Office Trading Systems

Freiberufler / Selbstst�ndiger

Remote-Arbeit

Verf�gbar ab: 02.09.2026

Verf�gbar zu: 100%

davon vor Ort: 0%

Top-Skills

Windows Presentation Foundation

MS SQL Server

ASP.NET

Web API

MVVM

Reactive Extensions (Rx)

Multithreading

Concurrency

Performance Optimization

Refactoring

Technical Debt Reduction

TDD

SOLID Principles

Blazor

DevExpress

REST

Financial Markets

Front Office Trading Systems

.NET 10.0

T-SQL

SQL

Infragistics

Sprachen

English

Spanish

Einsatzorte

L�nder

Deutschland, Schweiz, �sterreich

Remote-Arbeit

m�glich

Projekte

7 months

2025-09 - 2026-03

SharpFX front office platform

Senior Software Engineer C# WPF .NET ...

Rolle

Senior Software Engineer

Projektinhalte

Worked on CACIB?s SharpFX front-office platform, contributing to the development and enhancement of its FX pricing, hedging and trading stack.
Developed and enhanced functionality around pricing and auto-hedging workflows, including Forward Pricer and Sharp UI components.
Worked on performance, responsiveness and stability of trader-facing applications in a real-time front-office environment.
Delivered changes through the existing QA, code-review and production-validation process.

Kenntnisse

C# WPF .NET RX SQL

Kunde

Cr�dit Agricole CIB (London)

3 years 4 months

2022-05 - 2025-08

C#/.NET front-office applications for risk and P&L analysis

Senior C# Developer ? Front Office Risk & PnL C# .NET WPF ...

Rolle

Senior C# Developer ? Front Office Risk & PnL

Projektinhalte

Maintained, extended and supported business-critical C#/.NET front-office Risk and PnL applications for the Financial Markets trading department.
Worked on PnL Explain, involving derivatives, Greeks, pricing and curves, consuming data from external pricing grids and producing daily Greek/sensitivity exports, alongside other front-office Risk and PnL workflows.
Provided regular 3rd-line support, working directly with traders and front-office users to investigate, diagnose and resolve production issues, including occasional support directly from the trading floor.
Worked across C#, .NET, WPF/MVVM, DevExpress, multi-threaded Reactive Extensions, SQL Server, T-SQL, automated testing, dependency injection, Git and TeamCity.
Designed and implemented a major refactoring of the PnL Explain codebase, eliminating approximately 90% of accumulated technical debt and substantially improving maintainability, code structure and extensibility.
Led the design and implementation of a new Blazor application with a .NET Web API backend, modernising key functionality and introducing a scalable browser-based platform.

Kenntnisse

C# .NET WPF RX SQL Server

Kunde

BNP Paribas (Marylebone - London)

2020 ? 2022: Cyber-security Software

Customer: CyberWarrior (Boston, MA - US)
Role: Senior C# Developer

Tasks:
Designed and developed C#/.NET applications using Blazor, ASP.NET Web API, SQL Server and Azure, including backend services and internal management tools. Also built WPF/WCF applications and helped recruit and mentor junior developers. Applied TDD, SOLID and maintainable engineering practices.

Skills:
C#, WPF, RX, ASP.NET, SQL

2017 ? 2020: Front Office FX Platform

Customer: Citi Bank (Canary Wharf - London)
Senior C# Developer

Tasks:

Extended, maintained and supported Citi?s FX Connect Velocity front-office FX platform.
Contributed to redesign work, performance improvements, production support and code reviews.
Worked with C#, WPF/MVVM, DevExpress, multi-threaded Reactive Extensions, WCF, SQL Server, T-SQL, NUnit, Moq, Git and TeamCity.
Applied TDD, SOLID, dependency injection and maintainable engineering practices in a production-focused banking environment.

Skills:
C#, WPF, RX,.NET, SQL

2016 ? 2017: C# MVVM/WPF applications

Customer: Alere Toxicology Plc
Role: Senior Software Engineer

Tasks:
Designed and implemented C# MVVM/WPF applications, ASP.NET pages, Web API/WCF backend services and SQL Server database functionality. Mentored permanent developers on MVVM, SOLID and test-driven development practices.

Skills:
C#, WPF, .NET, SQL Server, Web API, WCF

2015 ? 2016: WPF Pivot Grid Control

Customer: SolidIcon
Role: Senior Software Engineer

Tasks:
I created a WPF Pivot-Grid control from scratch. I implemented a full MVVM WPF solution and mentored permanent developers to apply SOLID principles and Test-Driven Development keeping in mind the Agile Testing Pyramid.

Skills:
C#, WPF, ASP.NET, SQL

2014 ? 2015: Benchmarking and Business Intelligence

Customer: HouseMark Ltd (UK)
Role: Senior Software Engineer

Tasks:
I replaced the only developer of the company and took over all his work including ASP.NET MVC, SSAS, MDX, AngularJS, D3.js and Telerik.

Skills:
C#, ASP.NET, SQL

2012 ? 2014: Business Analytics

Customer: TIBCO Software
Role: Solutions Architect

Tasks:
I implemented the SQL Server Analysis Services and SAP/BW .NET Data Connectors for their famous software product TIBCO Spotfire�. Then I helped develop Spotfire Cloud� (AWS and SaaS).

Skills:
C#, SQL

2010 ? 2012: Expansion and implementation of internal products

Customer: Liberty Syndicates (UK)
Role: Senior Software Engineer

Tasks:
I took over the .NET and SQL work to later extend and implement other in-house products.

Skills:
C#, ASP.NET, SQL

2010: Data Management Software

Customer: Asset Control (UK)
Role: Senior Software Engineer

Tasks:
I was hired to help with the C# ASP.NET and SQL implementation of their famous product AC Plus�.

Skills:
C#, SQL

more projects on request

Aus- und Weiterbildung

1989
Bachelor's degree in Software Development
Montessori Computer Engineering College (Zaragoza, Spain)

Relevant training includes Design Patterns, Agile/Scrum, ITIL, WPF Line of Business, SQL Server Analysis Services performance tuning, Azure ML and TensorFlow.

Position

Senior C# / .NET Developer - Front Office FX, Risk, PnL & Trading Systems

Kompetenzen

Top-Skills

C# Windows Presentation Foundation MS SQL Server ASP.NET Web API MVVM Reactive Extensions (Rx) Multithreading Concurrency Performance Optimization Refactoring Technical Debt Reduction TDD SOLID Principles Blazor DevExpress REST Financial Markets Front Office Trading Systems .NET 10.0 T-SQL SQL Infragistics

Schwerpunkte

C#/.NET
WPF/MVVM
Front Office Trading
Performance
Concurrency�
Low-Latency Systems

Produkte / Standards / Erfahrungen / Methoden

PROFILE

Senior C#/.NET Software Engineer with over 25 years of professional software engineering experience across financial services, software products, cybersecurity, business analytics and other business-critical environments. Strong hands-on background in C#/.NET, backend and desktop development, performance optimisation, multi-threading, Reactive Extensions, SQL Server and production-critical systems.
Combines deep hands-on engineering experience with solution architecture and technical leadership, including system modernisation, complex refactoring, technical debt reduction, mentoring and team leadership. Strong advocate of maintainable design, SOLID principles, TDD, automated testing and pragmatic engineering practices.
Extensive experience in front-office financial systems covering FX, Risk, PnL, derivatives, pricing and trader-facing workflows. Comfortable working directly with business users to clarify requirements, diagnose production issues and deliver robust solutions in demanding, fast-moving environments.

RELEVANT FRONT OFFICE/ RISK EXPERIENCE

Cr�dit Agricole CIB: worked on the SharpFX front-office FX platform, covering pricing, hedging, Forward Pricer and trader-facing functionality.
BNP Paribas: maintained and enhanced front-office Risk and PnL applications for Financial Markets, including PnL Explain, where I implemented a major refactoring that removed approximately 90% of accumulated technical debt. Also worked across derivatives, Greeks, pricing and curves, consuming data from external pricing grids and supporting trader-facing workflows.
Citi Bank: worked on FX Connect Velocity, a front-office FX platform, contributing to redesign, performance improvements, production support and code quality.
Strong C#/.NET engineering background across backend services, SQL Server, WPF/MVVM, Reactive Extensions, automated testing and production-critical systems.
Provided regular 3rd-line support across front-office roles, working directly with traders and front-office users to diagnose and resolve production issues, including occasional support directly from the trading floor.

CORE SKILLS

Backend/ C# Engineering:�
- C#, .NET, ASP.NET Web API, WCF, ADO.NET, LINQ, SQL Server, T-SQL, REST, Git, TeamCity, JIRA
Performance/ Concurrency:�
- Performance optimisation, multi-threading, async programming, Reactive Extensions, production diagnostics, debugging, profiling
Front Office/ Financial Domain:�
- Risk, PnL, FX, derivatives, Greeks, pricing, pricing grid integration, curves, reporting, trader-facing workflows, 3rd-line production support
UI/ Modernisation:�
- WPF, MVVM, XAML, DevExpress, Blazor, ASP.NET MVC, JavaScript, TypeScript
Engineering Practices:�
- ?TDD, NUnit, MSTest, Moq, SOLID, dependency injection, code reviews, refactoring, technical debt reduction, maintainable architecture

Einsatzorte

L�nder

Deutschland, Schweiz, �sterreich

Remote-Arbeit

m�glich

Projekte

7 months

2025-09 - 2026-03

SharpFX front office platform

Senior Software Engineer C# WPF .NET ...

Rolle

Senior Software Engineer

Projektinhalte

Worked on CACIB?s SharpFX front-office platform, contributing to the development and enhancement of its FX pricing, hedging and trading stack.
Developed and enhanced functionality around pricing and auto-hedging workflows, including Forward Pricer and Sharp UI components.
Worked on performance, responsiveness and stability of trader-facing applications in a real-time front-office environment.
Delivered changes through the existing QA, code-review and production-validation process.

Kenntnisse

C# WPF .NET RX SQL

Kunde

Cr�dit Agricole CIB (London)

3 years 4 months

2022-05 - 2025-08

C#/.NET front-office applications for risk and P&L analysis

Senior C# Developer ? Front Office Risk & PnL C# .NET WPF ...

Rolle

Senior C# Developer ? Front Office Risk & PnL

Projektinhalte

Maintained, extended and supported business-critical C#/.NET front-office Risk and PnL applications for the Financial Markets trading department.
Worked on PnL Explain, involving derivatives, Greeks, pricing and curves, consuming data from external pricing grids and producing daily Greek/sensitivity exports, alongside other front-office Risk and PnL workflows.
Provided regular 3rd-line support, working directly with traders and front-office users to investigate, diagnose and resolve production issues, including occasional support directly from the trading floor.
Worked across C#, .NET, WPF/MVVM, DevExpress, multi-threaded Reactive Extensions, SQL Server, T-SQL, automated testing, dependency injection, Git and TeamCity.
Designed and implemented a major refactoring of the PnL Explain codebase, eliminating approximately 90% of accumulated technical debt and substantially improving maintainability, code structure and extensibility.
Led the design and implementation of a new Blazor application with a .NET Web API backend, modernising key functionality and introducing a scalable browser-based platform.

Kenntnisse

C# .NET WPF RX SQL Server

Kunde

BNP Paribas (Marylebone - London)

2017 ? 2020: Front Office FX Platform

Customer: Citi Bank (Canary Wharf - London)
Senior C# Developer

Tasks:

Extended, maintained and supported Citi?s FX Connect Velocity front-office FX platform.
Contributed to redesign work, performance improvements, production support and code reviews.
Worked with C#, WPF/MVVM, DevExpress, multi-threaded Reactive Extensions, WCF, SQL Server, T-SQL, NUnit, Moq, Git and TeamCity.
Applied TDD, SOLID, dependency injection and maintainable engineering practices in a production-focused banking environment.

Skills:
C#, WPF, RX,.NET, SQL

more projects on request

Aus- und Weiterbildung

Position

Senior C# / .NET Developer - Front Office FX, Risk, PnL & Trading Systems

Kompetenzen

Top-Skills

Schwerpunkte

C#/.NET
WPF/MVVM
Front Office Trading
Performance
Concurrency�
Low-Latency Systems

Produkte / Standards / Erfahrungen / Methoden

PROFILE

Senior C#/.NET Software Engineer with over 25 years of professional software engineering experience across financial services, software products, cybersecurity, business analytics and other business-critical environments. Strong hands-on background in C#/.NET, backend and desktop development, performance optimisation, multi-threading, Reactive Extensions, SQL Server and production-critical systems.
Combines deep hands-on engineering experience with solution architecture and technical leadership, including system modernisation, complex refactoring, technical debt reduction, mentoring and team leadership. Strong advocate of maintainable design, SOLID principles, TDD, automated testing and pragmatic engineering practices.
Extensive experience in front-office financial systems covering FX, Risk, PnL, derivatives, pricing and trader-facing workflows. Comfortable working directly with business users to clarify requirements, diagnose production issues and deliver robust solutions in demanding, fast-moving environments.

RELEVANT FRONT OFFICE/ RISK EXPERIENCE

Cr�dit Agricole CIB: worked on the SharpFX front-office FX platform, covering pricing, hedging, Forward Pricer and trader-facing functionality.
BNP Paribas: maintained and enhanced front-office Risk and PnL applications for Financial Markets, including PnL Explain, where I implemented a major refactoring that removed approximately 90% of accumulated technical debt. Also worked across derivatives, Greeks, pricing and curves, consuming data from external pricing grids and supporting trader-facing workflows.
Citi Bank: worked on FX Connect Velocity, a front-office FX platform, contributing to redesign, performance improvements, production support and code quality.
Strong C#/.NET engineering background across backend services, SQL Server, WPF/MVVM, Reactive Extensions, automated testing and production-critical systems.
Provided regular 3rd-line support across front-office roles, working directly with traders and front-office users to diagnose and resolve production issues, including occasional support directly from the trading floor.

CORE SKILLS

Backend/ C# Engineering:�
- C#, .NET, ASP.NET Web API, WCF, ADO.NET, LINQ, SQL Server, T-SQL, REST, Git, TeamCity, JIRA
Performance/ Concurrency:�
- Performance optimisation, multi-threading, async programming, Reactive Extensions, production diagnostics, debugging, profiling
Front Office/ Financial Domain:�
- Risk, PnL, FX, derivatives, Greeks, pricing, pricing grid integration, curves, reporting, trader-facing workflows, 3rd-line production support
UI/ Modernisation:�
- WPF, MVVM, XAML, DevExpress, Blazor, ASP.NET MVC, JavaScript, TypeScript
Engineering Practices:�
- ?TDD, NUnit, MSTest, Moq, SOLID, dependency injection, code reviews, refactoring, technical debt reduction, maintainable architecture

Vertrauen Sie auf Randstad

Im Bereich Freelancing

Im Bereich Arbeitnehmer�berlassung / Personalvermittlung

Fragen?

Rufen Sie uns an +49 89 500316-300 oder schreiben Sie uns:

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Telefonnummer Unternehmen

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Einsatzorte

Einsatzorte

Projekte

Projekte

SharpFX front office platform

C#/.NET front-office applications for risk and P&L analysis

Aus- und Weiterbildung

Aus- und Weiterbildung

Position

Position

Kompetenzen

Kompetenzen

Top-Skills

Schwerpunkte

Produkte / Standards / Erfahrungen / Methoden

Einsatzorte

Einsatzorte

Projekte

Projekte

SharpFX front office platform

C#/.NET front-office applications for risk and P&L analysis

Aus- und Weiterbildung

Aus- und Weiterbildung

Position

Position

Kompetenzen

Kompetenzen

Top-Skills

Schwerpunkte

Produkte / Standards / Erfahrungen / Methoden

Vertrauen Sie auf Randstad

Fragen?

Rufen Sie uns an +49 89 500316-300 oder schreiben Sie uns:

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