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

Big Wave Digital; Sydney; On-site; AUD 110,000 - 150,000; Full time

Job summary

Big Wave Digital is hiring a Senior Software Engineer to build the customer-facing experience on our financial platform.

You'll own features across the stack, implementing React/TypeScript frontend with .NET backend APIs, and work with design, product, compliance and other engineers to ship high‑quality, accessible code that drives conversion and growth.

Location is Sydney, on-site, with a hands-on role and real ownership in a fast-moving environment.

Qualifications

• Full-stack development experience with .NET and React/TypeScript.
• Experience with relational databases and data-driven rules.
• Ability to write clear, testable code and handle edge cases.
• Comfort with ownership and evolving priorities.

Responsibilities

• Build customer-facing features in React and TypeScript, and APIs in .NET.
• Improve onboarding, SSO and data requirements.
• Own features from design through release and iterations.
• Collaborate with design, product, compliance, and other engineers.
• Prioritize performance, reliability, accessibility, and maintainability.

Skills

React

TypeScript

.NET

Relational databases

Data-driven rules

Testing/quality code

Ownership

Tools

React

.NET

Job description

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

Build the first experience customers have with a financial platform.

We’re recruiting a Senior Software Engineer for a financial services client’s customer acquisition team. You’ll work on the journey from someone’s first visit to becoming an active customer: the public website, onboarding, identity verification, sign-in and promotions.

This is a hands‑on role with real ownership. You’ll build across the stack, help shape technical decisions and see how your work affects customer experience and growth.

What you’ll do

• Build customer-facing features in React and TypeScript, alongside APIs and services in .NET.
• Improve onboarding, SSO and the systems that determine what information each customer needs to provide.
• Own features from design discussions through release and ongoing improvement.
• Work closely with design, product, compliance and other engineers.
• Keep performance, reliability, accessibility and maintainability front of mind.

What you’ll bring

• Strong full‑stack engineering experience, with solid .NET skills and confidence building frontend products in React and TypeScript.
• Experience with relational databases, data‑driven rules and headless CMS platforms.
• An eye for edge cases and a habit of writing clear, testable code.
• Curiosity about how technical decisions affect conversion and the customer experience.
• The confidence to take ownership while priorities evolve.

Experience with OAuth/OIDC or SAML, KYC integrations, multilingual websites, technical SEO or high‑conversion digital products would be a bonus.

The details

• Location: Sydney, NSW (on‑site)
• Seniority: Mid‑Senior level
• Employment type: Full‑time