Senior .NET Full Stack & Integrations Developer

About the role

EY Global Delivery Service is hiring an Application Engineering Senior Developer in Buenos Aires. The role designs, builds and owns complex full-stack applications and enterprise integrations, with strong ownership of production systems, migrations and cutovers. It works with minimal supervision and acts as a key technical decision maker and escalation point.

Key responsibilities

• Lead design and implementation of API integrations using REST, JSON and authentication such as OAuth2, JWT and API keys, and build reverse and batch integrations with error handling, logging and retry mechanisms.
• Lead front-end development with Angular, HTML and TypeScript.
• Design SQL Server solutions, tune performance and index, and fix production data with governance and audit controls.
• Build ETL and data pipelines with Azure Data Factory and/or SSIS, handling large volumes of data accurately.
• Own critical production systems, triage and resolve incidents, and act as escalation point during migrations and cutovers.
• Mentor engineers on integration patterns, coding standards and operational best practices.

Required profile

• 6+ years in application engineering or full-stack development with significant exposure to enterprise integrations.
• Prior lead or senior technical role with ownership of production systems.
• Experience with large migrations, platform transitions or enterprise cutovers is highly desirable.

Required skills

• Angular 20+, TypeScript, HTML5, CSS3, ES6+ and RxJS
• .NET / .NET Core, C# and RESTful API design
• SQL Server, stored procedures and performance tuning
• Azure Data Factory and/or SSIS