.NET Developer & React Developer - 12 months - Immediate Start

FinXL AU; Sydney; On-site; AUD 140,000 - 180,000; Full time

Job summary

FinXL Professional Services seeks a senior .NET and React Developer to join our consulting team and be deployed with a leading government client on a major transformation program.

You will design, implement, and govern scalable web applications using C#, ASP.NET Core, React, and REST APIs, while leading code reviews, mentoring peers, and ensuring security, accessibility, and quality. The role requires 7+ years of experience and Australian citizenship for Baseline security clearance.

Qualifications

• 7+ years of commercial development experience.
• Advanced hands-on with C#, .NET Core, React, REST APIs.
• Experience governing AI-assisted tools (Claude Code) and applying governance.

Responsibilities

• Develop, unit test, and deploy scalable .NET and React web applications.
• Lead technical design, code reviews, and proofs of concept.
• Drive adoption and governance of Claude Code across the SDLC.
• Translate requirements into compliant designs.
• Ensure solutions meet architecture, WCAG accessibility, security, and privacy standards.
• Lead resolution of performance, integration, and production issues.
• Provide technical leadership, mentoring, and coaching to developers.

Skills

C#

.NET / ASP.NET Core

React

REST APIs

Claude Code

Software architecture

Code reviews

Agile delivery

Security & privacy

Tools

Git

CI/CD

Job description

FinXL Professional Services is a leading IT consultancy that partners with clients to bridge the gap between business needs and technology capabilities. Since 2003, we've been delivering high-value ICT services across government, finance, telecommunications, and enterprise sectors.

FinXL is seeking a .NET and React Developer to join our consulting team and be deployed with a leading government client on a key transformation engagement.

Responsibilities

• Develop, unit test, and deploy scalable .NET and React web applications.
• Lead technical design, code reviews, proofs of concept, and reusable patterns.
• Drive the adoption and governance of Claude Code across the SDLC.
• Translate business and technical requirements into compliant solution designs.
• Ensure solutions meet architecture, WCAG accessibility, security, and privacy standards.
• Lead the resolution of complex performance, integration, and production issues.
• Provide technical leadership, mentoring, and coaching to fellow developers.

Key Skills & Experience

• 7+ years of commercial experience delivering complex, production-grade applications.
• Advanced hands-on experience with C#, .NET / ASP.NET Core, React, and REST APIs.
• Advanced experience using and governing AI-assisted tools such as Claude Code.
• Strong knowledge of software architecture, design principles, and solution patterns.
• Proven experience with code reviews, automated testing, Git, CI/CD, and DevOps.
• Demonstrated technical leadership in Agile delivery, planning, and risk management.
• Australian citizenship and eligibility for Baseline security clearance.

Why Join FinXL?

• Work with a leading government client on major digital transformation
• Flexible consulting engagement supported by FinXL's specialist team
• Lead modern .NET, React, and AI-assisted development practices