Freelancer profile translated to English.
Back to original languageAbout Mélissa
Senior Developer / Fullstack Software Engineer | .NET / C# ⏐ React ⏐ Financial Applications
Senior Fullstack .NET / C# / React Developer with +13 years of experience, I design and develop critical applications for demanding environments, particularly in the banking, fintech, and asset management sectors.
I have supported major financial institutions such as BPCE / Natixis, UBS, Rothschild, and Silex (Switzerland) on technically complex projects: order management systems, investment platforms, financial middle-office, and real-time data applications.
My expertise covers the design, optimization, and modernization of robust and high-performance financial systems.
Areas of Intervention:
.NET Core / C# development for backend applications and critical services
Modern web applications in React / Next.js
Design of performant and scalable architectures
Optimization of system performance and reliability
Modernization of legacy .NET applications
API development and real-time integrations
Systems & Platforms Developed
- OMS (Order Management Systems)
- PMS (Portfolio Management Systems)
- Middle-office and financial reporting tools
- Integration of market data (Bloomberg, financial APIs)
- Analysis platforms and data pipelines
Technical Stack
.NET Core / C#
React / Next.js
SQL Server
ETL & data pipelines
REST APIs and system integrations
Automation and optimization of processes
My Added Value
- Strong experience in finance & real-time systems environments
- Structured and quality-oriented approach
- Ability to take over and stabilize complex systems
- Development of robust and maintainable solutions
🌍 100% full remote
🗣 Fluent French & English
Available for missions in .NET / C# development, React applications, and fintech or critical financial systems projects.
French
Native or bilingual
English
Native or bilingual
Can work on-site
Paris (up to 50km), Lille (up to 50km), Lyon (up to 50km), Toulouse (up to 50km), Nice (up to 50km)
Experience
- ÜTI Collective SASenior Technical Consultant (Remote)PRIVATE EQUITYJanuary 2026 - Today (7 months)Genève, SwitzerlandObjective: Migration of a financial platform (trading, pricing, financial product booking) to a secure cloud architecture with modernization of the server infrastructure and optimization of data processing.- Stack: React, Django (Python), PostgreSQL, .NET, SQL Server, Open AI, ElasticSearch, Sharepoint, Azure, Github- Design of the Azure cloud infrastructure for application environments (backend, frontend, DB, services): App Service, Key Vault, Storage, monitoring, with optimization of hosting costs- Implementation of an architecture ensuring data sovereignty, network isolation, and encryption of data at rest and in transit- Security of the Django REST backend through network access controls and hardening of the Django security configuration in production: HTTPS, secure headers, and cookie management- Integration of OpenAI into the financial platform to enable intelligent data analysis and conversational assistance for users- Migration of a PostgreSQL database to SQL Server in a production environment, including access management, data security, and monitoring setup- Writing documentation and supporting teams in platform operationKeywords: React, Django, PostgreSQL, Azure, Open AI, Financial platform, Pricing, Trading
- Rothschild & CoSenior Technical Consultant (via Capital Banking Solutions) (Remote)PRIVATE EQUITYAugust 2025 - January 2026 (5 months)Monaco, MonacoObjective: Optimization of the financial portfolio management system with a focus on FATCA compliance, financial order placement on the market, and reliability of client management reports.Stack: .NET, SQL Server, Camunda BPMN, Azure DevOps, GitLab- FATCA compliance for the order placement module to integrate FATCA restrictions- Partial redesign of the Cobalt middle office, responsible for transmitting transactions to market platforms (Bloomberg, etc.)- Development and automation of client reporting (portfolio management and performance reports)- Creation and optimization of SQL procedures for the calculation, validation, and reliability of financial data- Continuous improvement of application performance and PMS processing monitoring- Daily collaboration with front, middle, and back-office teams in an international Agile frameworkKeywords: .NET, SQL Server, PMS, OMS, order placement, FATCA, client reporting, Camunda BPMN, system integration, Bloomberg, Real-time
- UBSSenior Technical Consultant (via Capital Banking Solutions) (Remote)PRIVATE EQUITYNovember 2024 - August 2025 (9 months)Monaco, MonacoObjective: Implementation and customization of the CBS banking CRM for UBS, with strong technical and functional involvement.- Stack: .NET, SQL Server, SpringBoot, Java API, Camunda, GitLab- Deployment, configuration, and adaptation of CRM workflows- Support for the DMS migration with feasibility study and solution proposal- Development of In/Out integrations (Java API / .NET)- Creation of dashboards and calculation methods for client & account modules- Writing functional and technical documentation- Contract and budget monitoring, commercial proposals in parallel- Agile team work with developers, business stakeholders & project managersKeywords: .NET, Banking CRM, Java API, Camunda BPMN, system integration, SQL Server, Agile
Recommendations
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Education
- Master of ManagementIPSSI,Master IT Manager,
- Bachelor Project Manager in IT DevelopmentIPSSI,Bachelor Chef de projet en développement informatique,
Certifications
- ITIL® Foundation Certificate in IT Service ManagementEXIN2015
- Scrum MasterScrum League2023