Job DescriptionJob Description/n/n/nSenior / Staff Full Stack Engineer (Frontend Leaning) Location: Sydney, NSW/nEngagement: 6-month contract + extension/nThe Opportunity/nWe're working with a large Australian organisation looking for an experienced Full Stack Engineer with strong/nfrontend expertise to help build a new customer data and audience activation platform./nThis is a greenfield engineering opportunity where you'll help shape a complex, data-driven application from the/nground up./nThe platform will bring together customer data, audience segmentation and advertising activation into a single/napplication, giving teams better tools to create, manage and activate customer audiences across digital/nchannels./nYou'll work across the stack, with a particular focus on building intuitive, scalable frontend applications using/nReact and TypeScript./nWhat You'll Be Working On/n• Designing and building a complex, data-rich web application using React and TypeScript./n• Developing interactive dashboards, audience management tools and advanced filtering interfaces./n• Building rule-based segmentation tools with nested conditions, agile filters and complex user interactions./n• Integrating frontend applications with backend services, APIs and data platforms./n• Contributing to technical architecture, application design and engineering decisions./n• Working with engineers and business stakeholders to turn complex requirements into practical solutions./n• Helping establish engineering standards, reusable components and maintainable application architecture./n• Taking ownership of features from initial design through to production./nWhat We're Looking For/n• Strong commercial experience building complex applications with React and TypeScript./n• Solid full stack engineering experience,



including backend development and API integration./n• Experience building greenfield products or owning major features from design through to delivery./n• Strong understanding of frontend architecture, component design, state management and application performance./n• Experience working with data-heavy applications, dashboards, workflow tools or complex business logic./n• Ability to make sound technical decisions and work through ambiguous requirements./n• Strong communication skills and the ability to work closely with technical and non-technical stakeholders./n• A hands-on engineering approach, regardless of seniority./nNice to Have/n• Experience with Java, Kotlin or JVM-based backend services./n• Exposure to cloud platforms, distributed systems or event-driven architectures./n• Experience building SaaS platforms, internal products, analytics tools or data management applications./n• Experience working with customer data, advertising technology, retail technology or audience segmentation./n• Experience mentoring engineers or contributing to broader technical direction./nOffice:2 days per week/n/n/nWhy Consider This Opportunity?/nYou'll have the opportunity to help shape a new product from its early stages, influence technical decisions and/nbuild software used to manage complex customer data and advertising workflows./nThe work combines modern frontend engineering with meaningful backend integration, complex business logic/nand greenfield product development./nIt's particularly suited to engineers who enjoy building products from scratch, taking ownership and working/nacross the stack without losing their frontend specialisation./nInterested?/nApply directly or reach out to Matt at The Onset for a confidential discussion./n/n/n/n /n/n

📌 Senior Fullstack Engineer (Frontend Leaning) (Sydney)
🏢 The Onset
📍 Sydney