Application Engineering Senior Developer - .NET Full Stack & Integrations
Ernst and Young17 days ago
Wrocław, PolandSenior
Responsibilities
- Design and implement enterprise full-stack applications and API integrations.
- Build Angular applications using TypeScript, HTML5, CSS3, JavaScript, reusable components, state management, and responsive design.
- Develop secure and scalable integrations with authentication, error handling, logging, retries, and batch or reverse integration patterns.
- Design SQL Server queries, stored procedures, indexing strategies, performance improvements, and governed production data fixes.
- Implement ETL and data pipelines using Azure Data Factory and/or SSIS for high-volume enterprise processing.
- Own critical production systems, lead incident triage and root-cause analysis, and support remediation, migrations, and release cutovers.
- Coordinate technical decisions across business stakeholders, architects, delivery teams, and partner teams.
- Act as a subject matter expert and escalation point while mentoring engineers on integration and operational practices.
Requirements
- 6+ years of experience in application engineering or full-stack development with significant enterprise integration experience.
- Prior experience in senior or lead technical roles with ownership of production systems.
- Strong hands-on experience with .NET/.NET Core, C#, Angular, TypeScript, HTML5, CSS3, and modern JavaScript.
- Experience designing REST API integrations, JSON payloads and validation, authentication and authorization, error handling, and resiliency patterns.
- Advanced SQL Server experience including complex queries, stored procedures, performance optimization, and controlled production data fixes.
- Hands-on experience with Azure Data Factory and/or SSIS, including scalable data pipelines, batch processing, scheduling, and dependency management.
- Experience with Angular lifecycle hooks, dependency injection, routing, state management, RxJS, observables, authentication, authorization, performance optimization, and lazy loading.
- Experience supporting large migrations, platform transitions, or enterprise cutovers is highly desirable.
- Ability to operate independently, make technical and delivery decisions, manage production incidents, and collaborate across teams.
Benefits
- Hybrid work arrangement in Wrocław with 2 days in the office and 3 days remote.
- Continuous learning opportunities and support for developing new skills.
- Tools and flexibility to make a meaningful impact according to individual goals.
- Leadership coaching and development opportunities.
- Diverse and inclusive global culture with collaboration across EY locations and service lines.
Tech Stack
Categories
About Ernst and Young
Ernst & Young (EY) provides audit/assurance, tax, consulting, strategy and transactions services to enterprises, financial institutions, and public‑sector clients. Structured as a global network of partner‑owned member firms, it sells professional services on a fee basis, including a dedicated Financial Services Organization for banking, insurance, and capital markets. Headquartered in London, EY was formed in 1989 from the merger of Ernst & Whinney and Arthur Young, and operates in 150+ countries.