Application Engineering Senior Developer - .NET Full Stack & Integrations
Ernst and Young16 hours ago
Wrocław, PolandSenior
Responsibilities
- Design and implement full-stack applications, Angular frontends, REST API integrations, reverse integrations, and batch integrations.
- Build secure and scalable integrations with structured error handling, logging, retry mechanisms, authentication, and authorization.
- Design and develop SQL Server solutions, including complex queries, stored procedures, performance tuning, indexing, and governed production data fixes.
- Implement and manage ETL and data pipelines using Azure Data Factory and/or SSIS for high-volume enterprise data processing.
- Own critical production systems, lead incident triage and root-cause analysis, and support remediation, migrations, and release cutovers.
- Ensure system stability, observability, and operational readiness across environments.
- Act as a technical authority and subject matter expert for integration, migration, and data-flow solutions.
- Collaborate with business stakeholders, architects, and delivery teams to translate requirements into technical solutions.
- Coordinate across teams during migrations and production cutovers and mentor engineers on coding and operational practices.
Requirements
- At least 6 years of experience in application engineering or full-stack development with significant enterprise integration exposure.
- Prior experience in senior or lead technical roles with ownership of production systems.
- Strong hands-on experience with Angular, TypeScript, HTML5, CSS3, modern JavaScript, RxJS, and enterprise frontend architecture.
- Strong experience with .NET, .NET Core, C#, full-stack application development, RESTful API design, JSON payloads, schema validation, and resiliency patterns.
- Advanced SQL Server expertise, including complex queries, stored procedures, performance optimization, production data fixes, reconciliation, and high-volume data handling.
- Hands-on experience with Azure Data Factory and/or SSIS, batch processing, scheduling, dependency management, and scalable data pipelines.
- Experience with authentication and authorization mechanisms, including token handling, role-based access, guards, OAuth2, JWT, and API keys.
- Experience supporting large migrations, platform transitions, or enterprise cutovers is highly desirable.
- Ability to work independently, make technical and delivery decisions, troubleshoot production issues, and guide other engineers.
Benefits
- Hybrid work arrangement in Wrocław with 2 days in the office and 3 days remote.
- Continuous learning, coaching, and opportunities to develop leadership skills.
- Work with global EY teams, well-known brands, and colleagues across multiple countries and service lines.
- Diverse and inclusive culture with flexibility to make a meaningful impact.
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.