A fast-moving, dynamic fintech scale-up is hiring a Senior Software Engineer to own the systems that bring customers in and get them live. This is the front door to the product — the public website, onboarding, identity and sign-up flows — where everything you ship has a direct line to growth, revenue and the first impression every customer has of the business.
If you like working across the full stack, owning features end-to-end, and caring about how things actually perform for real users, this one is for you.
About this Senior Software Engineer role
As a Senior Software Engineer here, you will not be siloed. This Senior Software Engineer role spans backend and front end, so your impact is visible across the whole product. Day to day, a Senior Software Engineer on this team ships, reviews and mentors.
You’ll work across the full stack on the customer-facing platforms that power sign-up, onboarding, identity and activation — delivering secure, scalable, high-performing digital experiences. It’s a high-stakes, customer-facing surface where performance, reliability and experience quality all matter.
Working alongside the Engineering Manager, Product Owner, UX Designer and fellow engineers, you’ll:
- Build and maintain features across the customer-facing product surface — website, onboarding flows, SSO and sign-up promotions
- Work across the stack — backend APIs and services in .NET, plus frontend product work in React / TypeScript
- Contribute to architectural decisions and technical direction within the squad
- Write code that is readable, testable and built to last — and hold that bar in code reviews
- Take ownership of features end-to-end, from shaping the solution through to production and beyond
- Care about frontend quality — performance, accessibility, SEO and the experience details that move conversion
- Build and maintain multi-region, multi-lingual experiences (i18n, l10n and the infrastructure behind them)
- Spot and fix performance, reliability and quality issues proactively
Big Wave Digital — connecting great people with great tech teams
What we look for in a Senior Software Engineer
- Strong full-stack capability — solid .NET backend experience and comfortable building frontend product work in React / TypeScript
- Headless CMS experience — content-driven architectures and the patterns that keep them fast and maintainable
- Multi-region / multi-lingual development — i18n, l10n, routing strategies and the complexity that comes with them
- SEO fundamentals at depth — technical SEO, structured data, crawlability and Core Web Vitals as a ranking factor
- A track record of shipping quality software in a product environment with real users
- Genuine ownership — you care about what happens after the code merges
- Good engineering instincts — edge cases, failure modes and maintainability as a matter of course
- Enough frontend sensibility to care about conversion, performance and experience quality, not just functional correctness
- Collaborative and commercially curious — you get that what you build directly drives customer acquisition and growth
- Comfortable with fast-moving priorities and evolving context
Nice to have
- Experience with onboarding, identity verification or KYC flows
- Familiarity with SSO protocols — OAuth 2.0, OIDC, SAML
- Strong frontend depth — Lighthouse scores, accessibility, cross-device performance
- Background in fintech, e-commerce or other high-conversion consumer products
The offer
- $160,000 base + superannuation + bonus
- A senior role with real ownership on a high-impact, customer-facing product surface
- A fast-moving, dynamic fintech scale-up with genuine momentum
- Sydney CBD — 5 days a week onsite, working shoulder-to-shoulder with a sharp, collaborative team
About Big Wave Digital
This search is being run by Big Wave Digital, a specialist technology recruitment partner working with some of Australia’s most interesting tech and fintech businesses. We work closely with both the companies we represent and the people we place — so you’ll get straight answers, real context on the role, and someone in your corner throughout the process.
We also share roles, market insights and tech hiring trends in our newsletter — worth a look even if now isn’t the right time: subscribe here.
Sound like you?
Apply now with your CV, or reach out for a confidential chat. We’d love to hear from you.
Big Wave Digital places this role directly with the hiring team, so your application goes straight to a decision-maker rather than a queue. We have matched many a Senior Software Engineer with the right scale-up, and we know what strong engineering teams look for. If you want ownership, momentum and a genuine say in the architecture, this is a standout opportunity. Browse more technology roles at Big Wave Digital or apply now to take the next step as a Senior Software Engineer.
