Quantitative Developer

Phi Partners; Paris; On-site; EUR 70,000 - 90,000; Full time

Job summary

Phi Partners is a strategic IT consultancy for capital markets with 20+ years of experience, supporting top-tier banks and asset managers. The Front Office “Commando” team develops high-value tools on trading floors, including pricing, market-data calibration, and PnL explanations.

The role combines finance and software engineering on global applications. The successful candidate will work directly with traders, deliver front-office tools, and harmonise applications across geographies.

Qualifications

• Dual competency in financial mathematics and IT/ software engineering.
• Experience with derivatives products, equities.
• Strong C# / WPF / REST APIs; Python for exploration.
• Excellent interpersonal and communication skills.
• Fluent English; 3–6 years seniority.

Responsibilities

• Support the business day-to-day on exploration and prototyping (Python + REST APIs).
• Take business requirements directly from the desk (no intermediary MOA/BA).
• Develop the corresponding applications (C# / WPF / Blazor).
• Provide support and maintenance of these applications.
• Ensure the harmonisation of the tools across the different geographical zones.

Skills

C#

WPF

REST APIs

Blazor

Python

Financial mathematics

IT / software engineering

Equities derivatives

Trading floor communication

English fluency

Tools

Blazor

Job description

Phi Partners is a strategic capital markets IT consultancy with a proven track-record in delivering specialised front-office and risk technology services, solutions and expertise to buy-side and sell-side financial institutions for more than 20 years. We partner with global Tier-1 investment banks, hedge funds and asset managers across the trading lifecycle — electronic and automated trading, pricing and quantitative analytics, market and counterparty risk, and the supporting front-to-back platforms. Headquartered in London, we bring together more than 500 specialist consultants globally, combining deep front-office and risk domain knowledge with strong real-time engineering capability.

About the Programme

One of our clients is a leading European corporate and investment bank. Phi Partners is supporting the Front Office “Commando” team for Equity Markets, which works on the trading floor in close proximity to its clients (Trading, Financial Engineering). The team’s role is to deliver high, functional-value-added tools directly to the business.

The main tools developed are: financial-product pricing, market-data calibration, PnL explanation and backtesting. Clients are spread across all geographies and the applications are deployed worldwide. Strengths of the mission: daily proximity and iteration with the business (reporting line into Trading, seated on the desk), high-functional-value applications, and interaction with many teams. There is no intermediary business-analysis layer.

Role and Responsibilities

The successful candidate will be responsible for:

• Supporting the business day-to-day on exploration and prototyping (Python + REST APIs)
• Taking business requirements directly from the desk (no intermediary MOA/BA)
• Developing the corresponding applications (C# / WPF / Blazor)
• Providing support and maintenance of these applications
• Ensuring the harmonisation of the tools across the different geographical zones

Key Skills

The ideal candidate will have:

• A genuine dual competency in financial mathematics and IT / software engineering
• Experience with derivatives products, ideally on equities
• A strong level in C# / WPF / REST APIs, and proficiency in Python for exploration and prototyping
• Excellent interpersonal and communication skills, comfortable working directly on the trading floor
• Fluent English; senior experience (3-6 years)