We are seeking a highly technical, hands-on developer to modernise complex, time-critical applications supporting energy market operations.

What we need
Robust backend development experience with C# and up-to-date .NET , preferably .NET 8 or later.
Advanced Oracle SQL and PL/SQL skills, including performance tuning, transactions, locking and concurrency.
Experience with asynchronous, multithreaded, scheduled or event-driven systems.
Robust understanding of synchronisation, race conditions, timeouts, retries and failure recovery.
Ability to troubleshoot across application code, databases, services, configuration, scripts and infrastructure.
Experience modernising legacy systems while preserving existing business rules and processing outcomes.

The right candidate
Remains actively hands-on and enjoys solving difficult technical problems.
Can work independently and take ownership from investigation through to resolution.
Thinks beyond individual components and understands end-to-end system behaviour.
Is curious, methodical and evidence-driven.
Communicates complex technical findings clearly.
Values maintainability, reliability, performance, observability and testability.
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📌 Senior Net Developer City Of Sydney
🏢 XPT Software
📍 City of Sydney