{"id":2527802,"url":"https://alion.io/job/costar-software-engineer-trade-platform","title":"Software Engineer - Trade Platform","company":{"id":15350,"name":"CoStar Group","domain":"costar.com","url":"https://alion.io/company/costar","size_band":null,"is_staffing_agency":false,"employer_type":"direct","is_intermediary":true,"listed_via":null,"ats_vendor":"Eightfold","truth_index":null},"role":"Backend","role_family":"Backend","seniority":null,"employment_type":null,"work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Sydney, Australia"],"countries":["AU"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":55000,"max_usd":143000,"period":"year","method":"role_country_seniority_unknown","sample_n":29},"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":".NET","optional":false},{"name":"Agile","optional":false},{"name":"AWS","optional":false},{"name":"Azure","optional":false},{"name":"C#","optional":false},{"name":"Digital Twin","optional":false},{"name":"GCP","optional":false},{"name":"SQL","optional":false}],"status":"live","first_seen_at":"2026-10-01T00:00:00Z","employer_posted_date":"2026-10-01","last_verified_at":"2026-10-14T23:10:56Z","board_verified":true,"closed_at":null,"days_open":14,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":14},"description":"Software Engineer - Trade PlatformJob Description\nBuild solutions that power a leading property marketplace\nWe're looking for a Software Engineer to join our Trade Platform Team, where you'll help develop and support the systems that power customer subscriptions, billing, product entitlements, and agency integrations across Domain.\nWorking primarily with C# and .NET, you'll contribute to business-critical platforms that manage customer billing and usage charges, subscription tiers, premium listing experiences, and agency booking services. Your work will directly impact how customers interact with our products and how listings are promoted across the platform.\nWhat You'll Do\nDevelop, enhance, and maintain software solutions using C# and .NET.\nSupport systems responsible for customer billing, usage charging, and subscription management.\nBuild functionality that enables premium product features, including listing prioritisation, promotional placements, and customer entitlements.\nMaintain and improve agency booking APIs and integrations.\nDesign, develop and support scalable applications from concept through to production.\nCollaborate with Product, Engineering and business stakeholders to deliver customer value.\nTroubleshoot, diagnose and resolve production issues across critical systems.\nContribute to code quality, testing, security and engineering best practices.\nParticipate in a shared on-call roster supporting business-critical applications.\nContinuously improve platform performance, reliability and scalability.\nIdeally You'll Have\nCommercial experience developing applications with C# and .NET.\nExperience building and consuming RESTful APIs and integrations.\nStrong understanding of software engineering fundamentals and design principles.\nExperience working with SQL databases and distributed systems.\nKnowledge of cloud platforms such as AWS, Azure or GCP.\nExperience delivering solutions that are scalable, reliable and maintainable.\nA collaborative mindset and ability to work effectively within Agile teams.\nStrong problem-solving and troubleshooting skills.\nA passion for continuous learning and improving engineering practices.\nWhy Join Us?\nWork on platforms that directly impact customers and revenue.\nBe part of a collaborative team with experienced engineers who enjoy sharing knowledge.\nTackle complex technical challenges at scale.\nContribute to products used by thousands of customers every day.\nEnjoy opportunities to learn, grow and develop your technical expertise.\nWhat’s in it for you\nWorking 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!\nAt 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.\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.\nWhat’s Next?\nWe’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.\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":5240,"description_truncated":false,"requirements":{"experience_years_min":null,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":false,"languages":[]},"benefits":["Annual leave","Continuous learning","Equity"],"hiring_locations":[],"hiring_excludes":[],"relocation_offered":false,"industries":["Artificial Intelligence","Commerce","Real Estate","Commercial Real Estate"],"lifecycle":[{"event":"open","at":"2026-10-14T12:24:44Z"}],"visa":[],"liveness":{"score":68,"band":"ok","label":"Likely open","p_open":1,"p_active":0.757,"p_room":0.9,"age_days":14,"expected_fill_days":21,"reasons":["conf:1","win:mid","comp:brand"],"computed_at":"2026-10-15T00:41:19Z"},"pay":null,"html_url":"https://alion.io/job/costar-software-engineer-trade-platform","json_url":"https://alion.io/job/costar-software-engineer-trade-platform.json","meta":{"generated_at":"2026-10-15T00:41:19Z","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_verified","counted_by":"address","units_charged":1,"used_today":749,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-16T00:00:00Z"}},"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":15350},"rest":"https://alion.io/mcp/rest/get_company?id=15350"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fcostar-software-engineer-trade-platform"},{"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-software-engineer-trade-platform"},{"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-software-engineer-trade-platform"},{"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-software-engineer-trade-platform\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fcostar-software-engineer-trade-platform"}]}