Application Engineering Senior Developer – .
NET Full Stack & IntegrationsJob Summary:The Application Engineering Lead is responsible for designing, building, and owning complex full stack applications and enterprise integrations.
This role requires deep technical expertise across .
NET, API integrations, databases, and data pipelines, along with strong ownership of production systems, migration activities, and critical cutovers.
The role operates with minimal supervision and serves as a key technical decision maker and escalation point.
Roles & Responsibilities Application Development & Integrations• Lead the design and implementation of API integrations using REST, JSON, and industry standard authentication mechanisms (OAuth2, JWT, API keys, etc.).
• Lead the design and Implementation of Front end applications using Angular/HTML/Typescript• Build and maintain robust, secure, and scalable integrations with structured error handling, logging, and retry mechanisms.
• Design and implement reverse and batch integrations across internal and external systems.
• Act as the technical authority for complex integration patterns, data flows, and migration solutions.
Database & Data Engineering• Design and develop SQL Server solutions, including complex queries, stored procedures, performance tuning, and indexing strategies.
• Perform production data fixes with strong governance, validation, and audit controls.
• Implement and manage ETL and data pipelines using Azure Data Factory (ADF) and/or SSIS.
• Handle large scale, high volume data processing, ensuring data accuracy, reconciliation, and integrity across systems.
Production Ownership & Reliability• Own end to end accountability for critical production systems and integrations.
• Lead production issue triage, root cause analysis, and remediation, maintaining composure and sound judgment during high severity incidents.




• Serve as a trusted escalation point during production issues, migration waves, and release cutovers.
• Ensure system stability, observability, and operational readiness across environments.
Leadership & Stakeholder Management• Operate independently with minimal guidance, making informed technical and delivery decisions.
• Act as a subject matter expert (SME) for integration and migration initiatives.
• Collaborate effectively with business stakeholders, architects, and delivery teams to translate requirements into technical solutions.
• Coordinate across multiple teams during migrations and production cutovers, ensuring aligned execution and clear communication.
• Mentor and guide engineers on integration patterns, coding standards, and operational best practices.
Knowledge and Skills Requirements: Frontend & UI Engineering (Angular)• Strong hands on experience with Angular (version 20+) for enterprise grade web applications.
• Expertise in TypeScript, HTML5, CSS3, and modern JavaScript (ES6+).
• Experience designing and implementing component based architectures, reusable modules, and shared UI libraries.
• Strong understanding of Angular lifecycle hooks, dependency injection, routing, and state management.
• Experience with RxJS and reactive programming, including observables, subjects, and subscription management.
• Ability to consume and integrate REST APIs into Angular applications with proper error handling and retry logic.




• Experience implementing authentication and authorization mechanisms on the UI (token handling, role based access, guards).
• Proficiency in frontend performance optimization, change detection strategies, and lazy loading.
• Familiarity with responsive design and enterprise UI standards.
• Experience troubleshooting and resolving production UI issues with minimal supervision.
Core Technology Stack• Strong hands on experience with .
NET / .
NET Core, C#, and full stack application development.
• Extensive experience with RESTful API design and integration, including: o JSON payloads and schema validationo Authentication and authorization mechanismso Structured error handling and resiliency patternsDatabases & Data Processing• Advanced expertise in SQL Server, including: o Complex query designo Stored procedures and performance optimizationo Controlled production data fixes• Strong understanding of data reconciliation, validation, and high volume data handling.ETL & Integration Platforms• Hands on experience with Azure Data Factory (ADF) and/or SSIS.
• Knowledge of batch processing, scheduling, and dependency management.
• Experience designing scalable data pipelines for enterprise integrations.Supervision Responsibilities:• Direct reports• Working relationships (daily) with EY ITSD and AMS Lead• Working relationships (daily) with TCS AMS team• Liaison to the Business for that Portfolio / AppJob Requirements: Experience: • 6+ years of experience in application engineering / full stack development, with significant exposure to enterprise integrations.
• Prior experience in lead or senior technical roles with ownership of production systems.
• Experience supporting large migrations, platform transitions, or enterprise cutovers is highly desirable.

📌 Application Engineering Senior Developer -.Net Full Stack&Integrations - Ey Global Delivery Service (Buenos Aires)
🏢 EY
📍 Buenos Aires