Freelancer profile translated to English.
Back to original languageAbout Tristan
Looking for a .NET developer to work on a complex business application, a technical overhaul, or a web project in C# .NET and Angular?
I support SMEs, software publishers, and large corporations in the design, development, and reliability of web solutions: business applications, SaaS, internal tools, and APIs.
My approach combinesC# .NET / ASP.NET Core / Angularexpertise, product sensibility, code quality, and understanding of business challenges.
Objective:Deliver robust, scalable, and maintainable applications with best practices: Clean Code, SOLID, TDD.
Stack & Key Expertise
Backend:.NET Framework 4.0 → .NET 10, C#, ASP.NET Core, REST API, microservices, EF Core
Frontend:Angular, TypeScript, Razor, VueJS
Architecture:Clean Architecture, Hexagonal Architecture, DDD, Legacy Refactoring
DevOps & Data:Docker, CI/CD, Azure, IIS, SQL Server, PostgreSQL, Redis
Integrations:SSO, OIDC, Stripe, i18n, Third-party APIs
Methods:Agile, SDD, Claude Code, Clean Code, SOLID, TDD
Concrete Achievements:
- Technical and organizational audit of a .NET / Angular application with a prioritized action plan (Volume Software)
- Tax application for accountants in .NET 8 + Angular 17 (Agiris)
- SDD and Claude Code to accelerate scoping, specs, and development (Sofia dev)
- Multilingual e-commerce store with SSO and Stripe payment (MKG)
- Critical application overhaul for the general public (Enedis)
- Internal framework & QA automation for developers (Malakoff Humanis)
- NF525 cash register software: audit and developments (FDJ)
- SaaS for multilingual digital menus (SimplyRestau)
They Trusted Me:
FDJ, Enedis, Malakoff Humanis, Agiris, Sofia dev, MKG, Volume Software, CBM, OpenClassrooms, ENI, IMIE, CESI...
Let's Discuss Your Project
Available to discuss your technical or functional challenges.
See my client **recommendations**: bit.ly/3DSowzN
English
Fluent
French
Native or bilingual
Can work on-site
Tours (up to 50km), Paris (up to 50km), Bordeaux (up to 50km), Rennes (up to 50km), Nantes (up to 50km)
Experience
- SOFIA devC# .NET | Angular DeveloperHEALTH AND WELLNESSMay 2026 - Today (1 month)Tours, FranceProject:AI secretarial software for Massage TherapistsContext:Creation of a pilot project using Spec Driven Development (SDD)Objective:Develop the software from scratch in SDD modeStack:Angular, .NET, C#, Claude Code, SQL Server, PostgreSQLAchievement:
- In progress
- ISAGRIC# .NET | Angular DeveloperSOFTWARE PUBLISHINGFebruary 2026 - April 2026 (2 months)Tours, FranceProject: Web application for calculating and declaring income tax (IR and IFI) (DR WEB)Context:Overhaul and migration of a business software to the web, to automate tax declarations within a strict regulatory framework.Objectives:
- Offer a modern and fast interface
- Automate declaration workflows
- Manage large volumes of sensitive data
Stack:C#, .NET 8, Angular 17, Microservices, Hexagonal Architecture, RabbitMQ, SQL Server, Azure, DockerAchievement:- Fixed features that generated recurring anomalies during tax season
- Ensured reliability of business processes related to IR and IFI declarations
- Worked on complex rules: calculations, data roll-overs, controls, and edge cases
- Improved maintainability of certain code sections
- Supported internal developers in understanding the domain and best practices
- FDJ united.NET DeveloperRETAIL (SMALL BUSINESS)June 2025 - January 2026 (7 months)Tours, FranceProject:Compliance of Kapséo cash register software for LNE certificationContext:LNE certification of Kapséo software as part of the regulations for secure cash register software.Objective:
- Ensure Kapséo software compliance and obtain LNE certification.
Stack:C#, .NET 4.5, WPF, SQL ServerAchievement:- Technical audit of the existing system and identification of regulatory gaps
- Development and adaptation of features according to LNE requirements (security, traceability, archiving, data integrity)
- Writing of technical documentation for the certifying body
- Autonomous technical support for passing the certification until its obtention
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Education
- BTS Services informatiques aux organisationsLycée André Malraux Allonnes2015BTS Services informatiques aux organisations option solutions logicielles et applications métiers (SLAM)
- Software Engineering Manager (RIL), Information Technology Project ManagementCESI Le Mans2017Objectifs de la formation: - Recueillir, analyser et formaliser les besoins logiciels de l’entreprise. - Élaborer, gérer et piloter un projet d’ingénierie logicielle. - Participer à la conception, au développement et au déploiement de la solution. - Assurer le maintien en condition opérationnelle des solutions logicielles de l’entreprise.