Senior Application Engineering Developer – .NET Full Stack, Integrations

Jobtailor; Wrocław; On-site; PLN 180,000 - 300,000; Full time

Job summary

Jobtailor in Wrocław, Poland is seeking a senior full‑stack engineer to own complex enterprise integrations and end‑to‑end data pipelines. You will drive API integrations, front‑end design with Angular, and back‑end work in .NET, SQL Server, and ETL tooling, ensuring performance and reliability.

The role requires hands-on leadership, mentoring, and close collaboration with architects and delivery teams across migrations.

Qualifications

• 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.

Responsibilities

• 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.
• Own complex production systems and integrations end to end.
• Mentor and guide engineers on integration patterns, coding standards, and operational best practices.
• Coordinate multiple teams during migrations and production cutovers.
• Lead production issue triage, root-cause analysis, remediation, migrations, and release cutovers.
• Collaborate with stakeholders, architects, and delivery teams to translate requirements into technical solutions.
• Ensure system stability, observability, and operational readiness.

Skills

Full-stack development

Angular 20+

TypeScript

HTML5

CSS3

JavaScript ES6+

REST APIs

OAuth2/JWT

RxJS

UI authentication

SQL Server

Azure Data Factory

SSIS

Data integration

Education

Bachelor's degree in Computer Science

Tools

Azure Data Factory

SSIS

JWT

OAuth2

Git

Job description

• 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

• 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

Core Competencies

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 Development


• Angular Version 20+


• SQL Server Performance Optimization


• RESTful API Design and Integration


• Azure Data Factory (ADF) Implementation

ATS Optimization Keywords

Hard Skills

• Angular


• TypeScript


• HTML5


• CSS3


• JavaScript (ES6+)


• SQL Server


• REST APIs


• ETL


• Data Pipelines


• Component-Based Architectures

Soft Skills

• Leadership


• Collaboration


• Mentoring


• Problem-Solving


• Communication

Industry Keywords

• Enterprise Integrations


• Production Systems


• Data Reconciliation


• High-Volume Data Processing


• UI Authentication and Authorization

Tools & Technologies

• Azure Data Factory


• SSIS


• JWT


• OAuth2


• RxJS