Frontend Engineer - BizBuySell - San Francisco

Frontend Engineer
- Biz Buy Sell
- San Francisco

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.

Biz Buy Sell  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.

Biz Buy Sell  is looking for a Frontend Engineer 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 Biz Buy Sell  -

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

• Design, develop, and support high-traffic, real-time web applications using ASP.NET Core MVC on the backend and Angular, Vue, Type Script, 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.

• Bachelor’s degree from an accredited, not-for-profit, in-person University or College
• A track record of commitment to prime employers
• Strong working knowledge of modern web technologies (HTML5, CSS, JavaScript)
• Experience with a modern SPA framework (Angular, Vue, etc.) and Type Script
• Proven ability to write clean, maintainable, and well-documented code
• Experience working in an Agile development environment
• Excellent communication and collaboration skills

• 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…