Senior Software Engineer (iOS)

Senior Software Engineer (iOS) Job Description Senior Software Engineer (iOS) will shape the technical direction of our team, partnering with Team Leaders and senior technology leaders to define strategic roadmaps and prioritise initiatives that deliver business outcomes. The Senior Software Engineer (iOS) is responsible for providing technical leadership and subject-matter expertise, making technical decisions, and ensuring quality and efficiency in project execution. They help to make architecture 'real' for teams, within and outside their area, by defining technical blueprints and patterns. They use their deep, specialist technical knowledge to coach and upskill others, contributing to the community of practice across the Technology organisation. This role sits within the Resi Consumer Business Line and is embedded within the Property Research App team which is responsible for building the native experience that provides consumers insights about all thing’s property. What you’ll do Drive the technical direction of your squad, ensuring solutions are scalable, resilient, and aligned to the broader technology strategy. Lead the design and implementation of architecture patterns, turning technical vision into practical, high-quality solutions. Own the health and performance of services, proactively identifying opportunities to optimise systems and reduce technical risk. Champion engineering excellence through strong testing, documentation, code quality, and continuous improvement of SDLC practices. Evaluate emerging technologies and lead innovation initiatives that enhance platform capabilities and business outcomes. Mentor and coach engineers, fostering a culture of continuous learning, collaboration, and high performance. Partner with cross-functional teams and stakeholders to drive technical alignment, delivery outcomes, and knowledge sharing. Act as a key technical advisor for your squad, providing technical leadership, delivery guidance, risk management, and business-focused decision making. Ideally, you’ll have 5+ years of hands-on experience developing native iOS applications, with a proven track record of delivering scalable mobile solutions. Experience leading the successful delivery of major mobile features within high-performing engineering teams. Strong background building customer-facing or enterprise-grade applications in Agile environments. Demonstrated experience mentoring engineers and contributing to engineering excellence through improved practices and processes. Proven ability to collaborate with Product, Design, and Engineering stakeholders to shape technical roadmaps and outcomes. Deep expertise in Swift, iOS SDK, SwiftUI, UIKit, and modern architecture patterns such as MVVM, VIPER, or TCA. Strong understanding of mobile performance optimisation, testing practices, API integration (REST/GraphQL), and microservices-based architectures. Proficiency with modern development tools and practices, including Git, CI/CD pipelines, accessibility standards, and mobile best practices. What’s in it for you Working at CoStar Group means you'll enjoy a culture of collaboration and innovation that attracts the best and brightest across a broad range of disciplines. We offer you generous compensation and performance-based incentives. As well as having an outstanding working environment, other perks include extra days of annual leave, leadership development programs, LinkedIn Learning, Perkbox discounts and much more! At CoStar, we recognise the positive value of diversity and promote equality. We aim at all times to recruit the person who is most suited to the job and welcome applications from people of all backgrounds including but not limited to; people of all genders, of all ages, sexual orientations, ethnicities, nationalities, religions and beliefs. About Domain (part of the CoStar Group) Domain is a leading property technology and services marketplace that is home to one of the largest portfolios of property brands in Australia, including the Domain, Allhomes and Commercial Real Estate (CRE) platforms. In 2025, Domain became part of CoStar Group - a global leader in commercial real estate information, analytics, online marketplaces and 3D digital twin technology. We are dedicated to digitising the world’s real estate, empowering all people to discover properties, insights, and connections that improve their businesses and lives. Equity, Diversity & Inclusion Domain is enthusiastically and unapologetically committed to fostering an equitable, inclusive work culture which reflects our customers and communities. We are proactively looking for candidates from all lived experiences, including people with disability, and people of all ages, ethnicities, cultures (including Aboriginal and Torres Strait Islander Peoples), faiths, sexual orientations, and gender identities (including trans and non-binary people). We are committed to providing an equitable recruitment process for people with disability. If you require adjustments during the process we’re here to support. If you wish to receive this job advertisement in an accessible format, or have a confidential chat about workplace adjustments, please contact our Equity, Diversity and Inclusion team at or leave a message on 1300 858 356 and we will get back to you. What’s Next? We’ll give your application the thoughtful attention it deserves and get back to you as soon as possible. If there’s a match, one of our recruitment consultants will reach out—so keep your phone handy! We’re genuinely excited about the chance to work together and make a meaningful impact. CoStar Group is an Equal Employment Opportunity Employer; we maintain a drug-free workplace and perform pre-employment substance abuse testing