Software Engineer II (C#/.NET) - BizBuySell - San Francisco, CA

Job Description

CoStar Group (NASDAQ: CSGP) is a leading global provider of commercial and residential real estate information, analytics, and online marketplaces. Included in the S&P 500 Index, CoStar Group is on a mission to digitize the world’s real estate, empowering all people to discover properties, insights and connections that improve their businesses and lives.

We have been living and breathing the world of real estate information and online marketplaces for over 35 years, giving us the perspective to create truly unique and valuable offerings to our customers. We’ve continually refined, transformed, and perfected our approach to our business, creating a language that has become standard in our industry, for our customers, and even our competitors. We continue that effort today and are always working to improve and drive innovation. This is how we deliver for our customers, our employees, and investors. By equipping the brightest minds with the best resources available, we provide an invaluable edge in real estate.

BizBuySell operates the internet's largest and most heavily trafficked business for sale marketplaces, with more business listings, more unique users, and more leads delivered than any other platform. Our customers include small business buyers, sellers, owners, brokers, and others who need our information and services to help them buy or sell a business or franchise. Buying and selling a business is time consuming and arduous process. We are on a mission to automate that complex process into easy and manageable one for both sellers as well as buyers. This role is central to building compelling experience in our platform with native support to multiple languages, currencies, and locale preferences. 

BizBuySell is looking for a Software Engineer II who is passionate about building intuitive, high-performance web experiences that simplify the complex process of buying and selling a business for both buyers and sellers.

Learn more about BizBuySell - www.bizbuysell.com

This position is located in San Francisco and is 5 days onsite.  

Responsibilities:

• ​Design, develop, and support high-traffic, real-time web applications using ASP.NET Core MVC on the backend and Angular, Vue, TypeScript, HTML5, CSS, and JavaScript on the frontend, ensuring they are performant, maintainable, and reusable.
• Build responsive, accessible (WCAG-compliant) interfaces that work reliably across browsers and devices. 
• Lead in establishing 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 for building 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 to implementation.   
• Collaborate with engineers, product managers, and business partners on product design, feature development and delivery.
• Gain a deep understanding of the company's business domain and products. 

Basic Qualifications: 

• Bachelor's degree from an accredited, not-for-profit, in-person University or College
• A track record of commitment to prior employers. 

• 2+ years of production development experience with C# .Net (or .Net Core)

• Strong working knowledge of modern web technologies (HTML5, CSS, JavaScript). 
• Experience with a modern SPA framework (Angular, Vue, etc.) and TypeScript. 
• Proven ability to write clean, maintainable, and well-documented code. 
• Experience working in an Agile development environment. 
• Excellent communication and collaboration skills. 

Preferred Qualifications:

• Experience building and deploying web applications to a cloud platform (AWS, Azure). 
• Experience with relational databases (e.g., SQL Server, MySQL). 
• Experience with software testing frameworks (e.g., Jest, Mocha). 
• Deep understanding of software design patterns and principles. 
• Experience in microservices architectures. 
• Experience mentoring junior developers. 
• Effective use of AI-assisted development tools (e.g., Claude Code, Copilot) to accelerate delivery while maintaining strong code quality and architectural judgment. 

What’s in it for You

When you join CoStar Group, you’ll experience a collaborative and innovative culture working alongside the best and brightest to empower our people and customers to succeed. We offer you generous compensation and performance-based incentives. CoStar Group also invests in your professional and academic growth with internal training and tuition reimbursement.

• Our benefits package includes (but is not limited to):
• Comprehensive healthcare coverage: Medical / Vision / Dental / Prescription Drug
• Life, legal, and supplementary insurance​
• Virtual and in person mental health counseling services for individuals and family
• Commuter and parking benefits
• 401(K) retirement plan with matching contributions
• Employee stock purchase plan
• Paid time off
• Tuition reimbursement
• On-site fitness center and/or reimbursed fitness center membership costs (location dependent)
• Access to CoStar Group’s Employee Resource Groups
• Complimentary gourmet coffee, tea, hot chocolate, fresh fruit, and other healthy snacks

The final salary or hourly rate offered for this role will fall within the range set forth below based on a variety of factors, including but not limited to, geographic location, skills, and competencies.

Base Compensation: $125,000 - $172,000 (Annually)

We welcome all qualified candidates who are currently eligible to work full-time in the United States to apply. However, please note that CoStar Group is not able to provide visa sponsorship for this position

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CoStar Group is an Equal Employment Opportunity Employer; we maintain a drug-free workplace and perform pre-employment substance abuse testing