Senior iOS Engineer Job Description The role of a Senior iOS Engineer is pivotal in supporting the delivery of our Strategy by driving innovation and ensuring the development of high-quality software solutions. By leveraging advanced technical skills and a deep understanding of software engineering principles, the Senior Engineer contributes to the creation of robust, scalable, and efficient applications that align with our strategic goals. This role involves not only writing and reviewing code but also architecting solutions that meet both current and future business needs, ensuring Software Solutions supports the overall Domain vision. This role sits within the RTA (https://www.realtimeagent.com.au/) Core Squad that is responsible for building and operating the core platform of the RTA product which supports Agents to provide a digital contracts experience to their vendors and purchasers. As a senior mobile app engineer you will focus on all aspects of the solution design and implementation of RTA’s iOS app. There is also scope to work in a full-stack capacity for the right candidate. What you’ll do - Build high quality scalable, reliable and performant solutions in collaboration with other engineers and tech leads. - Keep abreast of latest trends in technology and software engineering. Use responsible engineering principles to understand when and how to apply those same trends. - Champion and adopt Engineering best practices. - Participate in and contribute to cross-domain technology forums such as Architecture Guild and Tech Leadership Guild. - Contribute to the System Health and Tech debt backlog for their respectively owned service. - Champion engineering efficiency for their respective team and services. - Collaborate with Lead Engineers and Tech Leads on improving process and system change. - Build a deep understanding of their product and business domain. - Demonstrates a collaborative, 'build-and-operate' mindset, taking end-to-end ownership for service quality. - Possesses excellent written and verbal communication skills, able to articulate complex technical ideas to both technical and non-technical stakeholders. Essential: - At least 5+ years of hands-on commercial experience in software or data engineering. - Degree in Computer Science / Software Engineering related field - Experience with mobile app development (iOS) using Swift - Knowledge of mobile app best practice - Highly regarded experience: - SwiftUI/UIKit - Swift Package Manager - Experience using RESTful APIs and GraphQL - AWS CDK / DevOps - Firebase - RealmSwift Nice to have - Experience designing software solutions for scale - Experience working with Tech leads to optimise engineering practices and processes - Experience implementing DevOps practices and CI/CD - Experience working in Agile environments - Experience working in cross functional teams (Product, Design and Tech) 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 edi@domain.com.au or leave a message on 1300 858 356 and we will get back to you. CoStar Group is an Equal Employment Opportunity Employer; we maintain a drug-free workplace and perform pre-employment substance abuse testing