.Net / React Full Stack Developer

.Net / React Full Stack Developer – 12 Months Contract – Paris, France

Starting date: 20 July

Hybrid – 3 days on site, 2 days remote

Must be fluent in French with a good command of English. CLIENT WILL ONLY ACCEPT CV’S IN ENGLISH.

Must Have – At least 6 years within software Development. .NET 10 / C#. Entity Framework. React. REST APIs. PostgreSQL. MongoDB. Hexagonal Architecture / Clean Architecture. Unit Testing & Integration Testing. Git. CI/CD. Familiarity with AWS & cloud-based application environments. Strong awareness of software quality, maintainability, security, & operational excellence. Ability to work autonomously on complex topics without being expected to act as an official Tech Lead or Architect. Previous experience in a product environment with strong production, quality, & application-maintenance requirements.

The scope of the mission focuses on the Finance team. In practice, this team mainly handles accounting flows, reconciliation processes, data quality & consistency, processing traceability, anomaly correction, & the operation of business-critical & sensitive processes. The platform is built on a microservices architecture & leverages AWS cloud components, with strong requirements in terms of reliability, maintainability, & scalability within an international environment. As a result, a solid understanding of the AWS ecosystem is expected in order to work effectively within the existing platform.

We are looking for a .Net / React Full-Stack Mid-Senior to Senior level. You should be autonomous, detail-oriented, capable of owning topics end-to-end, & comfortable working in both product-development & production-support environments. You will contribute to the development & maintenance of features related to accounting workflows & associated business processes. You will also participate in incident analysis, process reliability improvements, technical debt reduction, & the continuous enhancement of software quality.

.Net / React Full Stack Developer Key Responsibilities

• Develop & maintain backend features using .NET / C# & frontend features using React.
• Design & enhance reliable REST APIs & application services.
• Contribute to the reliability of accounting workflows, data quality, & processing consistency.
• Improve traceability, reconciliation capabilities, & discrepancy analysis.
• Correct defects, reduce manual interventions, & prevent regressions.
• Reduce technical debt when it improves product reliability, maintainability, or operational efficiency.
• Create & maintain the necessary unit tests, integration tests, & regression tests.
• Document technical decisions, critical business processes, & operational procedures required for production support.

Production Support & Operations Expectations

• Analyse logs, application errors, & unexpected production behaviour.
• Investigate incidents, identify root causes, & propose appropriate fixes.
• Provide production support for processes within the team's scope.
• Contribute to runbooks, technical documentation, & support procedures.
• Secure fixes through appropriate testing & careful assessment of potential side effects.

Use of AI Tools

The thoughtful use of AI tools to assist with development, testing, documentation, code analysis, or investigations is appreciated. Such usage must remain compatible with the product's security, confidentiality, human validation, & software quality requirements in a production environment.

Nice to Have

• Hands-on experience with AWS serverless or containerized services
• Microservices experience
• Experience working with a Design System
• Experience with finance, accounting, billing, reconciliation, or data-quality workflows
• Observability practices: logs, metrics, traces, & alerting
• Professional use of AI tools for development, testing, documentation, or code analysis