Senior Software Engineer
CoStar GroupBase Salary
$124k - $187k/yr
Responsibilities
- Design, build, and maintain production applications using C# and .NET.
- Use Claude for code generation, refactoring, debugging, and analysis.
- Build and operate cloud-based solutions on AWS.
- Develop APIs and backend services.
- Collaborate with product, architecture, and engineering teams.
- Participate in system design, code reviews, and technical decision-making.
- Improve application performance, scalability, and reliability.
- Mentor engineers and contribute to engineering best practices.
Requirements
- Bachelor's degree from an accredited, not-for-profit, in-person college or university.
- A track record of commitment to prior employers.
- Strong experience with C# and .NET/.NET Core.
- Hands-on AWS experience, including EC2, ECS/EKS, Lambda, S3, RDS, DynamoDB, and CloudWatch.
- Experience building APIs and backend services.
- Solid understanding of software design principles.
- Experience with Git-based workflows.
- Preferred: practical experience using Claude for coding or code review.
- Preferred: experience with Databricks, microservices or distributed systems, CI/CD pipelines, DevOps practices, infrastructure-as-code with Terraform, CloudFormation, or CDK, and additional AI coding tools.
Benefits
- Comprehensive medical, vision, dental, prescription drug, life, legal, and supplementary insurance.
- Virtual and in-person mental health counseling for individuals and families.
- Commuter and parking benefits.
- 401(k) retirement plan with matching contributions.
- Employee stock purchase plan.
- Paid time off.
- Tuition reimbursement and internal training supporting professional and academic growth.
- On-site fitness center or reimbursed fitness center membership costs where available, plus yoga, Pelotons, personal training, and group exercise classes.
- Employee Resource Groups.
- Complimentary gourmet coffee, tea, hot chocolate, fresh fruit, and other healthy snacks.
- Located in San Diego, CA, with four days onsite and one day working from home.
About CoStar Group
CoStar Group (NASDAQ: CSGP) is a global leader in commercial real estate information, analytics, online marketplaces, and 3D digital twin technology. Founded in 1986, CoStar Group is dedicated to digitizing the world’s real estate, empowering all people to discover properties, insights, and connections that improve their businesses and lives. CoStar Group’s major brands include CoStar, a leading global provider of commercial real estate data, analytics, and news; LoopNet, the most trafficked commercial real estate marketplace; Apartments.com, the leading platform for apartment rentals; Homes.com, the fastest-growing residential real estate marketplace; and Domain, one of Australia’s leading property marketplaces. CoStar Group’s industry-leading brands also include Matterport, a leading spatial data company whose platform turns buildings into data to make every space more valuable and accessible, STR, a global leader in hospitality data and benchmarking; Ten-X, an online platform for commercial real estate auctions and negotiated bids; and OnTheMarket, a leading residential property portal in the United Kingdom. CoStar Group’s websites attracted over 143 million average monthly unique visitors in the third quarter of 2025, serving clients around the world. Headquartered in Arlington, Virginia, CoStar Group is committed to transforming the real estate industry through innovative technology and comprehensive market intelligence. From time to time, we plan to utilize our corporate website as a channel of distribution for material company information. For more information, visit CoStarGroup.com.