Senior .NET Backend Engineer: Data Migration & API Services

Umbrella Club; Sydney; On-site; AUD 150,000 - 190,000; Full time

Job summary

Umbrella Club is seeking an experienced Backend Engineer to drive a large-scale .NET migration programme in Sydney. You will own backend services, REST APIs and data flows across systems.

The role focuses on data migration, SFTP file handling and batch processing, with emphasis on data validation and reliable reconciliation across targets. You will collaborate with platform teams and contribute to testing and cutover activities.

Qualifications

• 8+ years of backend engineering experience with .NET/C#.
• Hands-on experience with REST APIs and backend services.
• Strong SQL Server skills for data extraction, transformation and reconciliation.
• Experience developing data migration scripts and migration utilities.

Responsibilities

• Build .NET-based migration utilities, backend services and APIs.
• Develop SQL scripts to support large-scale data migration.
• Process files received via SFTP and load data into target systems.
• Support ETL and batch interfaces during migration.
• Perform data validation, reconciliation and troubleshoot issues.
• Assist migration testing, rehearsals and production cutover activities.

Skills

.NET/C#

REST APIs

SQL Server

Data migration

SFTP transfers

API integration

ETL & batch processing

Data validation & reconciliation

Tools

SQL Server

SFTP

Job description

Umbrella Club is seeking an experienced Backend Engineer to drive a large-scale .NET migration programme in Sydney. You will own backend services, REST APIs and data flows across systems.

The role focuses on data migration, SFTP file handling and batch processing, with emphasis on data validation and reliable reconciliation across targets. You will collaborate with platform teams and contribute to testing and cutover activities.