Senior Full-Stack Engineer: .NET & React (On-site Sydney)

Big Wave Digital; Sydney; On-site; AUD 120,000 - 180,000; Full time

Job summary

Big Wave Digital is seeking a Senior Software Engineer for a financial services client to own the customer acquisition journey—from first visit to active customer. You’ll build across the stack with React, TypeScript, and .NET, shaping the experience and driving growth.

Location is Sydney, NSW, on-site. The role emphasizes ownership, collaboration with design, product, and compliance, and delivering reliable, accessible customer experiences at scale.

Qualifications

• Full-stack engineering experience with .NET and frontend in React/TypeScript.
• Experience with relational databases and headless CMS.
• Clear, testable code and attention to edge cases.
• Ownership mindset and ability to adapt priorities.

Responsibilities

• Build customer-facing features in React and TypeScript, and APIs in .NET.
• Improve onboarding, SSO, and data collection rules.
• Own features from design through release and improvements.
• Collaborate with design, product, compliance, and other engineers.

Skills

Full-stack engineering

NET

React

TypeScript

Relational databases

Headless CMS

Clear, testable code

Edge cases

Ownership

Tools

.NET

React

TypeScript

OAuth/OIDC

SAML

Job description

Big Wave Digital is seeking a Senior Software Engineer for a financial services client to own the customer acquisition journey—from first visit to active customer. You’ll build across the stack with React, TypeScript, and .NET, shaping the experience and driving growth.

Location is Sydney, NSW, on-site. The role emphasizes ownership, collaboration with design, product, and compliance, and delivering reliable, accessible customer experiences at scale.