{"id":2056730,"url":"https://alion.io/job/costar-group-senior-software-engineer","title":"Senior Software Engineer","company":{"id":6056,"name":"CoStar Group","domain":"costargroup.com","url":"https://alion.io/company/costargroup","size_band":"1001-5000","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Workday","truth_index":{"grade":"B","score":77,"open_postings":83,"ghost_share":0,"stale_share":0.94,"repost_share":0,"time_to_fill_p50_days":30,"computed_at":"2026-10-08T05:49:30Z"}},"role":"Backend","role_family":"Backend","seniority":"senior","employment_type":"full_time","work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Melbourne, Australia"],"countries":["AU"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":83000,"max_usd":162000,"period":"year","method":"role_seniority_country_cell","sample_n":11},"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Agile","optional":false},{"name":"Amazon CloudWatch","optional":false},{"name":"Amazon ECS","optional":false},{"name":"AWS","optional":false},{"name":"AWS Lambda","optional":false},{"name":"Azure","optional":false},{"name":"CI/CD","optional":false},{"name":"Digital Twin","optional":false},{"name":"Docker","optional":false},{"name":"GCP","optional":false},{"name":"GraphQL","optional":false},{"name":"JavaScript","optional":false},{"name":"Next.js","optional":false},{"name":"OWASP","optional":false},{"name":"React.js","optional":false},{"name":"TypeScript","optional":false}],"status":"live","first_seen_at":"2026-10-08T00:05:36Z","employer_posted_date":"2026-10-08","last_verified_at":"2026-10-08T21:10:11Z","board_verified":true,"closed_at":null,"days_open":1,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":1},"description":"Senior Software EngineerJob Description\nThe Senior Engineer drives high-quality software development and innovation, serving as a key driver of technical direction within Domain’s Residential Consumer web teams. This pivotal role involves architecting scalable, highly performant user interfaces, writing and reviewing code, and ensuring all technical solutions align with the broader Domain Strategy. Leveraging deep expertise in React, TypeScript, and Next.js, the engineer will lead the development of complex features and champion frontend quality standards to solve real customer problems and enhance our website.\nThe Senior Engineer plays a crucial role in mentoring and guiding more junior team members, fostering a culture of continuous improvement and engineering excellence.\nWhat you’ll do\nResponsible for the entire lifecycle of medium-sized projects: engineering design, development, test, production, and deployment and subsequent fixes and improvements.\nFinds solutions to unsolved, loosely defined, highly technical problems.\nConsistently writes, co-writes, and reviews documentation and production-ready code that is clear, concise, tested, and easily understood by others.\nQuick and effective in identifying and resolving issues, balancing trade-offs between speed, quality, and technical debt.\nUnderstands the big picture and system-wide impact, aligning with and contributes to domain-wide architecture, security and technology standards.\nDesigns solutions with scalability and future needs in mind.\nOptimises for performance, maintainability, and security, actively looks for security vulnerabilities both in code and when providing code reviews.\nContribute to the System Health and Tech debt backlog for their respective owned service.\nCollaborate with Lead Engineers and Tech Leads on improving process and system change.\nMentors and guides junior team members, fostering a culture of continuous improvement and engineering excellence.\nEssential:\nDegree in Computer Science / Software Engineering or related field\nDeep expertise in ReactJS, JavaScript, TypeScript, and Next.js. \nStrong understanding of modern architectural patterns, including Micro frontends, Single-Page Applications (SPA), and Server-Side Rendering (SSR). \nFamiliarity in GraphQL, including experience adding and modifying queries and mutations. \nHands-on experience leveraging AI coding assistants to improve engineering productivity and code quality. \nExperience designing software solutions built for high scale and high traffic websites. \nDevOps practices, CI/CD, and infrastructure-as-code \nStrong practical experience with AWS cloud services, including ECS, Lambda, and CloudWatch. \nFamiliarity with containerization technologies like Docker. Experience working effectively within Agile environments. \nSecurity: Familiarity with modern Application Security Practices (OWASP). \nCertifications: AWS, Azure, or GCP Certification. \nWhat’s In It For You?\nAbout Domain (part of the CoStar Group)\nDomain 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.\nEquity, Diversity & Inclusion\nDomain 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).\nWe 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.\nCoStar Group is an Equal Employment Opportunity Employer; we maintain a drug-free workplace and perform pre-employment substance abuse testing","description_format":"text","description_chars":4596,"description_truncated":false,"requirements":{"experience_years_min":null,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":{"level":"bachelor","optional":false},"security_clearance":false,"languages":[]},"benefits":["Equity"],"hiring_locations":[],"hiring_excludes":[],"relocation_offered":false,"industries":["Real Estate","Commercial Real Estate"],"lifecycle":[{"event":"open","at":"2026-10-08T00:05:36Z"}],"visa":[],"liveness":{"score":38,"band":"fade","label":"Fading","p_open":1,"p_active":0.379,"p_room":1,"age_days":0,"expected_fill_days":30,"reasons":["conf:2","stale_co","evergreen","velocity","win:early","comp:brand"],"computed_at":"2026-10-08T05:49:30Z"},"pay":null,"html_url":"https://alion.io/job/costar-group-senior-software-engineer","json_url":"https://alion.io/job/costar-group-senior-software-engineer.json","meta":{"generated_at":"2026-10-09T00:37:25Z","cache_seconds":300,"methodology":"https://alion.io/methodology","terms":"https://alion.io/terms","contact":"https://alion.io/contact","api":"https://alion.io/developers","about":"Alion is a live layer of people, companies and AI agents: who they are, whether they are real and active right now, what they do and how to work with them, readable by people and by agents and paid per call.","catalog":"https://alion.io/catalog.json","usage":{"tier":"crawler","counted_by":"address","units_charged":1,"used_today":853,"day_limit":5000,"remaining_today":4147,"minute_limit":60,"resets_at":"2026-10-10T00:00:00Z"}},"offers":[{"id":"company.slices","title":"One company in depth, by slice","status":"live","price":{"credits":0.02,"usd":0.002,"plus_per_slice":{"credits":0.05,"usd":0.005}},"unit":"per company, plus each slice with data","note":"the employer in depth","call":{"mcp_tool":"get_company","arguments":{"id":6056},"rest":"https://alion.io/mcp/rest/get_company?id=6056"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fcostar-group-senior-software-engineer"},{"id":"market.stats","title":"A market slice: pay, demand and time to fill","status":"live","price":{"credits":1,"usd":0.1},"unit":"per slice","note":"pay, demand and time to fill for this role and place","call":{"mcp_tool":"market_stats"},"human":"https://alion.io/catalog?offer=market.stats&for=job%2Fcostar-group-senior-software-engineer"},{"id":"job.search","title":"Open jobs by role, technology, place, pay and visa","status":"live","price":{"credits":0.02,"usd":0.002},"unit":"per posting in a list","note":"similar open postings","call":{"mcp_tool":"search_jobs"},"human":"https://alion.io/catalog?offer=job.search&for=job%2Fcostar-group-senior-software-engineer"},{"id":"company.verify","title":"Is this company real and active right now","status":"pilot","price":null,"unit":"per company","request":{"url":"https://alion.io/catalog/request","method":"POST","body":"{\"offer\": \"company.verify\", \"for\": \"job/costar-group-senior-software-engineer\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fcostar-group-senior-software-engineer"}]}