United States
Anduril Industries
CoStar
LoopNet - Lead Software Engineer
United States
Irvine, California, United States
TypeScriptReactSQLAWSC#
About the opportunity
CoStar Group is a leading global provider of commercial and residential real estate information, analytics, and online marketplaces. Included in the S&P 500 Index and the NASDAQ 100, 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.
LoopNet, the most popular place to find a space, is the #1 global commercial real estate marketplace. With more than 12 million global unique monthly visitors, LoopNet provides brokers, buyers and sellers with what they need to meet and make deals. LoopNet has established itself as the most effective and far-reaching digital marketplace for commercial real estate owners and brokers. We are not done yet! We continue to focus on driving expansion by increasing market share in the US and abroad, continuously innovating and enhancing the product and growing a powerhouse global team to reach our goals. Learn more about LoopNet.
Our team is seeking an accomplished Lead Software Engineer to join our team in supporting multiple software products and brands across the organization, such as LoopNet.com. You will have a direct impact on highly visible web applications that touch more than 10,000,000 users. You continuously learn emerging technologies and architecture advancements and apply the learnings to improve LoopNet’s software products.
This position is located in Irvine, CA and offers 4 days a week onsite with 1 day work from home.
This position offers a base salary range of $144,000-$222,000, based on relevant skills and experience and includes a generous benefits plan.
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. #LI-AV1 #LoopNet
RESPONSIBILITIES
- Own the technical design and delivery of features across a high-traffic full-stack platform, applying OO design principles and proven design patterns for reusability, maintainability, scalability, performance and security.
- Set and uphold engineering standards, drive design reviews, code reviews, and testing practices across the team.
- Write unit-testable, well-tested C# and TypeScript, and contribute to shared product frameworks and platform libraries.
- Lead full-stack development across the current platform and legacy codebases including modernizing, refactoring, and integrating where needed.
- Mentor and grow engineers; break down ambiguous problems into deliverable work and build consensus across teams.
- Partner with product to deliver software that meets specifications and performance SLAs, and use AI coding tools (Claude Code, GitHub Copilot, or equivalent) to accelerate development, refactoring, and debugging.
- Own production quality, observability, performance, and reliability of the services you ship.
- Continuously evaluate emerging technologies to identify trends and best practices that strengthen CoStar's platform and engineering practices
REQUIRED QUALIFICATIONS
- Bachelor's degree from an accredited, not-for-profit, in-person University or College
- A track record of commitment to prior employers.
- 9+ years of production development experience with C# / .NET (or .NET Core).
- Proficient in building production grade level front-ends apps in TypeScript with a modern framework like React, Angular, or Vue.
- A demonstrable track record of building, launching, and operating successful full-stack products and platforms at scale.
- Hands-on experience with AWS (S3, SQS, DynamoDB, ElastiCache), Apache Kafka, and Datadog.
- Strong grasp of writing unit-testable software with a disciplined approach to unit, performance, and automation testing.
- Leverage AI Coding Tools for development, refactoring, and debugging (Claude Code, GitHub Copilot or equivalent).
- Hands-on experience working with build pipelines and CI/CD.
- Experience mentoring engineers and leading technical initiatives through delivery.
PREFERRED QUALIFICATIONS
- Proven experience with AI-driven development workflows (Claude Code, GitHub Copilot, or equivalent) used to ship complete projects to production.
- Proven experience of working on applications hosted on multi-data centers both on-prem and clouds.
- Experience internationalizing and localizing applications for multiple regions and languages.
- Experience building SEO-facing, public-traffic web applications.
- Hands-on experience improving UI/UX, translating designs into polished, user-friendly interfaces.
- Relational database design (MS SQL or MySQL) including query performance tuning.
- Application infrastructure security knowledge and fluency with Git-based workflows.
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
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