{"id":2527952,"url":"https://alion.io/job/costar-senior-software-engineer-audience-amplication","title":"Senior Software Engineer - Audience Amplication","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":"senior","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":82000,"max_usd":171000,"period":"year","method":"role_seniority_country_cell","sample_n":8},"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Amazon Aurora","optional":false},{"name":"Apache Kafka","optional":false},{"name":"ASP.NET Core","optional":false},{"name":"AWS","optional":false},{"name":"Azure","optional":false},{"name":"C#","optional":false},{"name":"CI/CD","optional":false},{"name":"Digital Twin","optional":false},{"name":"DynamoDB","optional":false},{"name":"GCP","optional":false},{"name":"MySQL","optional":false},{"name":"OWASP","optional":false},{"name":"PostgreSQL","optional":false},{"name":"React.js","optional":false},{"name":"Redis","optional":false},{"name":"Shift-Left","optional":false},{"name":"Shift-Left Security","optional":false},{"name":"SQL","optional":false},{"name":"TypeScript","optional":false},{"name":"JavaScript","optional":true}],"status":"live","first_seen_at":"2026-09-18T00:00:00Z","employer_posted_date":"2026-09-18","last_verified_at":"2026-10-14T16:02:17Z","board_verified":true,"closed_at":null,"days_open":26,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":26},"description":"Senior Software Engineer - Audience AmplicationJob Description\nThe Senior Engineer is pivotal in supporting the delivery of our Domain Strategy by driving innovation and ensuring the development of high-quality software solutions. They are responsible for the entire lifecycle of medium-sized projects: engineering design, development, test, production, and deployment and subsequent fixes and improvements.\nBy 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 writing and reviewing code, as well as architecting solutions that meet both current and future business needs.\nThe Senior Engineer plays a crucial role in mentoring and guiding more junior team members, fostering a culture of continuous improvement and engineering excellence. By leading by example and providing support, this role helps build a strong, cohesive squad team capable of tackling complex challenges and delivering high-quality software products. The Senior Engineer also collaborates closely within their cross-functional squad team, working closely with the Product Owner to ensure that software solutions are aligned with customer value and business needs.\nSquad Mission \nThe Audience Amplification Platform team sits within the Agent Division and is responsible for Domain Group’s digital marketing innovation, powering the next generation of property advertising beyond our owned platforms. The team builds and supports Domain’s social platform products, enabling high-impact campaigns across Facebook, Instagram, Google and other leading digital channels. Our mission is to make every campaign smarter, more transparent and more effective for our customers.\nResponsibilities:\nResponsible for the entire lifecycle of projects: engineering design, development, test, production, and deployment and subsequent fixes and improvements.\n\nConsistently writes, co-writes, and reviews documentation and production-ready code that is clear, concise, tested, and easily understood by others.\n\nProficient in multiple languages, frameworks, and tools.\n\nQuick and effective in identifying and resolving issues, balancing trade-offs between speed, quality, and technical debt.\n\nApproaches work with a security lens and actively looks for security vulnerabilities both in code and when providing code reviews.\n\nIdeally you will have:\nExperience with .NET, React, TypeScript or similar frontend technologies.\n\nExperience with cloud platforms such as AWS, Azure or GCP.\n\nExperience with microservices and event-driven architectures\n\nExperience with API and asynchronous integration patterns such as SNS/SQS and Kafka.\n\nExperience with SQL data stores (PostgreSQL, MySQL/Aurora) and NoSQL (DynamoDB, Redis)\n\nExperience with DevOps practices, CI/CD, and infrastructure-as-code\n\nTechnical Skills\nDeep expertise in C# / .NET and ASP.NET Core.\n\nUnderstands shift-left testing and how to implement it in practice\n\nFamiliar with Functional and Object Oriented programming\n\nFamiliar with Cloud Design patterns, TDD, BDD and Domain Driven design\n\nFamiliar with modern Application Security Practices (OWASP)\n\nDegree in Computer Science / Software Engineering or related field\n\nWhat’s in it for you?\nThe opportunity to work for Domain now 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.\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":5028,"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":["Artificial Intelligence","Commerce","Real Estate","Commercial Real Estate"],"lifecycle":[{"event":"open","at":"2026-10-14T12:24:44Z"}],"visa":[],"liveness":{"score":36,"band":"fade","label":"Fading","p_open":1,"p_active":0.663,"p_room":0.55,"age_days":26,"expected_fill_days":23,"reasons":["conf:3","win:tail","comp:brand"],"computed_at":"2026-10-14T19:25:25Z"},"pay":null,"html_url":"https://alion.io/job/costar-senior-software-engineer-audience-amplication","json_url":"https://alion.io/job/costar-senior-software-engineer-audience-amplication.json","meta":{"generated_at":"2026-10-14T19:25:25Z","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_verified","counted_by":"address","units_charged":1,"used_today":25559,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-15T00:00:00Z"}},"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-senior-software-engineer-audience-amplication"},{"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-senior-software-engineer-audience-amplication"},{"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-senior-software-engineer-audience-amplication"},{"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-senior-software-engineer-audience-amplication\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fcostar-senior-software-engineer-audience-amplication"}]}