Software Engineer II (C#/.NET) - BizBuySell - San Francisco, CA
About The Position
CoStar Group is seeking a Software Engineer II for BizBuySell, its online marketplace for buying and selling businesses. The role focuses on building intuitive, high-performance web experiences that simplify the process for buyers and sellers. It is located in San Francisco and requires working onsite five days per week. The engineer will develop and support high-traffic, real-time web applications using ASP.NET Core MVC and modern frontend technologies. The role includes building responsive, accessible interfaces with support for multiple languages, currencies, and locale preferences; contributing to architectural practices; and collaborating with engineers, product managers, and business partners to deliver product features. The position requires a bachelor's degree from an accredited, not-for-profit, in-person university or college and at least two years of production development experience with C# .NET or .NET Core. Candidates should have experience with a modern SPA framework and TypeScript, modern web technologies, Agile development, and writing clean, maintainable, documented code. The position offers an annual base compensation range of $125,000 to $172,000, along with benefits and professional development opportunities. CoStar Group does not provide visa sponsorship for this position.
Requirements
- Bachelor's degree from an accredited, not-for-profit, in-person university or college.
- A track record of commitment to prior employers.
- At least 2 years of production development experience with C# .NET or .NET Core.
- Strong working knowledge of modern web technologies, including HTML5, CSS, and JavaScript.
- Experience with a modern SPA framework such as Angular or Vue, and TypeScript.
- Ability to write clean, maintainable, and well-documented code.
- Experience working in an Agile development environment.
- Excellent communication and collaboration skills.
Nice To Haves
- Experience building and deploying web applications to a cloud platform such as AWS or Azure.
- Experience with relational databases such as SQL Server or MySQL.
- Experience with software testing frameworks such as Jest or Mocha.
- Deep understanding of software design patterns and principles.
- Experience in microservices architectures.
- Experience mentoring junior developers.
- Effective use of AI-assisted development tools such as Claude Code or Copilot to accelerate delivery while maintaining code quality and architectural judgment.
Responsibilities
- Design, develop, and support high-traffic, real-time web applications using ASP.NET Core MVC and frontend technologies including Angular, Vue, TypeScript, HTML5, CSS, and JavaScript.
- Build responsive, accessible, WCAG-compliant interfaces that work reliably across browsers and devices.
- Help establish architectural best practices and mentor junior team members.
- Analyze technical requirements and architect new components and web pages.
- Implement product features, refine specifications, and continuously improve code quality.
- Apply software design patterns and best practices to build reusable and maintainable code.
- Participate in code reviews, source control management, build automation, and testing processes.
- Take ownership of assigned tasks and deliver solutions from concept through implementation.
- Collaborate with engineers, product managers, and business partners on product design, feature development, and delivery.
- Develop a deep understanding of the company's business domain and products.
Benefits
- Generous compensation and performance-based incentives.
- Professional and academic growth opportunities, including internal training and tuition reimbursement.
- Medical, vision, dental, and prescription drug coverage.
- Life, legal, and supplementary insurance.
- Virtual and in-person mental health counseling services for individuals and families.
- Commuter and parking benefits.
- 401(k) retirement plan with matching contributions.
- Employee stock purchase plan.
- Paid time off.
- On-site fitness center and/or reimbursed fitness center membership costs, depending on location.
- Access to CoStar Group Employee Resource Groups.
- Complimentary gourmet coffee, tea, hot chocolate, fresh fruit, and other healthy snacks.
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What This Job Offers
Job Type
Full-time
Career Level
Mid Level
