Senior Application Engineering Developer – .NET Full Stack, Integrations

Senior .NET developer designing full-stack applications, APIs, and data pipelines for EY’s global consulting and professional services business. Owning production systems, migrations, and enterprise integrations.

Posted 9/11/2026full-timeWrocław • 🇵🇱 PolandSeniorWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates expertise in full-stack application development, particularly with Angular, TypeScript, and SQL Server, while leading enterprise integrations and managing production systems. Proficient in designing secure, scalable data pipelines and implementing robust API integrations.

Highest-signal resume keywords

Full-Stack Application DevelopmentAngular Version 20+SQL Server Performance OptimizationRESTful API Design and IntegrationAzure Data Factory (ADF) Implementation

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

AngularTypeScriptHTML5CSS3JavaScript (ES6+)SQL ServerREST APIsETLData PipelinesComponent-Based Architectures

Soft Skills

LeadershipCollaborationMentoringProblem-SolvingCommunication

Tools & Technologies

Azure Data FactorySSISJWTOAuth2RxJS

Industry Keywords

Enterprise IntegrationsProduction SystemsData ReconciliationHigh-Volume Data ProcessingUI Authentication and Authorization

Tech Stack

Tools & technologies

AngularAzureETLJavaScript.NETRxJSSQLSSISTypeScript

About the role

Key responsibilities & impact

Design, build, and own complex full-stack applications and enterprise integrations
Lead API integrations using REST, JSON, OAuth2, JWT, API keys, and other authentication mechanisms
Lead front-end application design and implementation using Angular, HTML, and TypeScript
Build and maintain secure, scalable integrations with error handling, logging, and retry mechanisms
Design and implement reverse and batch integrations across internal and external systems
Act as technical authority for integration patterns, data flows, and migration solutions
Design and develop SQL Server solutions, including queries, stored procedures, performance tuning, and indexing
Perform governed production data fixes with validation and audit controls
Implement and manage ETL and data pipelines using Azure Data Factory and/or SSIS
Handle high-volume data processing, reconciliation, and integrity across systems
Own critical production systems and integrations end to end
Lead production issue triage, root-cause analysis, remediation, migrations, and release cutovers
Ensure system stability, observability, and operational readiness
Make technical and delivery decisions independently with minimal guidance
Collaborate with stakeholders, architects, and delivery teams to translate requirements into technical solutions
Coordinate multiple teams during migrations and production cutovers
Mentor and guide engineers on integration patterns, coding standards, and operational best practices
Liaise with EY ITSD, AMS teams, and the business portfolio/app

Requirements

What you’ll need

6+ years of experience in application engineering / full stack development
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
Strong hands-on experience with Angular version 20+
Expertise in TypeScript, HTML5, CSS3, and modern JavaScript (ES6+)
Experience with component-based architectures, reusable modules, and shared UI libraries
Understanding of Angular lifecycle hooks, dependency injection, routing, and state management
Experience with RxJS and reactive programming
Ability to consume and integrate REST APIs into Angular applications
Experience implementing UI authentication and authorization mechanisms
Proficiency in frontend performance optimization, change detection strategies, and lazy loading
Familiarity with responsive design and enterprise UI standards
Experience troubleshooting production UI issues with minimal supervision
Strong hands-on experience with .NET / .NET Core, C#, and full stack application development
Extensive experience with RESTful API design and integration
Knowledge of JSON payloads, schema validation, authentication and authorization, structured error handling, and resiliency patterns
Advanced expertise in SQL Server, including complex query design, stored procedures, performance optimization, and controlled production data fixes
Strong understanding of data reconciliation, validation, and high-volume data handling
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

Benefits

Comp & perks

Continuous learning and development opportunities
Tools and flexibility to make a meaningful impact
Leadership insights, coaching and confidence-building
Diverse and inclusive culture
Collaboration with EY teams on global projects
Exposure to an expanding ecosystem of people, learning, skills and insights