Senior .NET Technical Lead - Secure Gov Apps (Onsite)

Whizdom; Melbourne; On-site; AUD 120,000 - 170,000; Full time

Benefits offered by this job

Mission-critical tech

Secure environment

Collaborative team

Long-term contract

Job summary

Whizdom, Melbourne, seeks a Senior .NET Developer (Technical Lead) to sustain, enhance and support mission-critical applications in a highly secure environment. You will lead Level 3/4 support, drive major enhancements, and ensure ISM compliance while coordinating end-to-end releases.

This hands-on leadership role requires strong SDLC expertise, Waterfall delivery experience, and a proven ability to manage critical incidents in secure gov/defense contexts.

Qualifications

• Strong expertise in .NET Framework, .NET Core, and C# development.
• Extensive experience supporting and developing enterprise applications in Microsoft technology environments.
• Strong knowledge of IIS and Windows Server-based web application hosting.
• Proven experience across the full Software Development Lifecycle (SDLC).
• Demonstrated experience working within structured Waterfall delivery frameworks.
• Excellent problem-solving, troubleshooting, and stakeholder engagement skills.
• Experience supporting business-critical systems in secure or regulated environments.

Responsibilities

• Lead Level 3 and Level 4 application support activities, including code-level troubleshooting and root cause analysis.
• Design and deliver major application enhancements within a structured Waterfall development methodology.
• Maintain application security accreditation and configuration in line with ISM requirements.
• Coordinate end-to-end software releases, ensuring testing, approval, and deployment controls.
• Manage high-priority incidents and provide timely resolution of production issues.
• Maintain and update technical documentation, including architecture and system design artefacts.
• Provide technical leadership and guidance across application lifecycle activities.

Skills

.NET Framework

.NET Core

C#

IIS

Windows Server

SDLC

Waterfall

Stakeholder engagement

Security compliance

Problem solving

Tools

Enterprise apps

Job description

Whizdom, Melbourne, seeks a Senior .NET Developer (Technical Lead) to sustain, enhance and support mission-critical applications in a highly secure environment. You will lead Level 3/4 support, drive major enhancements, and ensure ISM compliance while coordinating end-to-end releases.

This hands-on leadership role requires strong SDLC expertise, Waterfall delivery experience, and a proven ability to manage critical incidents in secure gov/defense contexts.