Apartments.com - Senior Software Engineer (C#/.NET/Payments Platform)

Sorry, this job was removed at 06:18 a.m. (CST) on Tuesday, Jan 06, 2026
2 Locations
In-Office or Remote
124K-187K Annually
Information Technology • Real Estate • Analytics
The Role
Apartments.com - Senior Software Engineer (C#/.NET/Payments Platform)


Job Description


Overview

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 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.   

Apartments.com is the nation’s #1 rental marketplace for owners, property managers and consumers. Apartments.com is the network that millions of renters every year rely on to find their new place, is continuing to grow our industry-leading sales force.  We provide apartment Property Managers and Owners with a platform to market their property listings and the industry’s most comprehensive virtual tools to attract the most and highest-quality renters.  The Apartments.com Network includes Apartments.com, ForRent.com, ApartmentFinder.com, ApartmentHomeLiving.com, and eight other leading rental sites. Our suite of services includes digital advertising, social and reputation management, and market analytic solutions which delivers innovative tools for our customers.

Learn more about Apartments.com.

We’re seeking a Senior Software Engineer (C#/.NET) to join our high-performance backend engineering team in Irvine, CA, focused on the Apartments.com Payments Platform—a mission-critical system that securely processes over $5 billion in rental payments every year. This platform is the backbone of our marketplace, enabling seamless and reliable transactions between renters, owners, and property managers at massive scale.

This position is located in Irvine, CA and offers 4 days a week onsite with 1 day work from home.

RESPONSIBILITIES

  • Design and develop using Object Oriented design principles and software design patterns to attain high reusability and maintainability.

  • Deep knowledge and experience in writing unit testable software with C#

  • Develop an in-depth understanding of CoStar’s product architecture and frameworks. Maintain and contribute to CoStar’s product platform as necessary.

  • Develop database stored procedures and SQL scripts/ETL jobs that meet CoStar database standards to implement product requirements.

  • Participate and drive continuous improvement within CoStar’s Agile/Scrum teams. 

  • Build consensus among different teams working on software development projects.

  • Facilitate discussions among other .NET and database developers to exchange new ideas and improvements.

  • Continually evaluate emerging technologies to identify opportunities, trends and best practices that can be used to strengthen CoStar’s technology platform and development practices.

BASIC QUALIFICATIONS

  • Bachelor’s Degree required from an accredited, not-for-profit, in-person college/university

  • A track record of commitment to prior employers.

  • 5+ years of production development experience with C# .Net (Java)

  • A demonstrable track record of building and launching successful products and platforms

  • Deliver products that meet specifications and performance SLA

  • Experienced in unit, performance, and automation testing

  • Deeply understand what drives the business for which you are building software

  • Take an active role in mentoring developers with ability to build consensus

PREFERRED QUALIFICATIONS

  • Demonstrate working knowledge Vue, React or Angular in TypeScript

  • Experience in relational database design (MS SQL or MySQL) including performance tuning

  • Experience with AWS S3, SQS, Dynamo, ElastiCache, Apache Kafka and Datadog

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, tuition reimbursement, and an inter-office exchange program.

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), with yoga studio, Pelotons, personal training, group exercise classes

  • Access to CoStar Group’s Diversity, Equity, & Inclusion Employee Resource Groups

  • Complimentary gourmet coffee, tea, hot chocolate, fresh fruit, and other healthy snacks

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.

This position offers a base salary range of $124,000-$187,000, based on relevant skills and experience and includes a generous benefits plan.

#LI-VP1


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

CoStar Group Compensation & Benefits Highlights

The following summarizes recurring compensation and benefits themes identified from responses generated by popular LLMs to common candidate questions about CoStar Group and has not been reviewed or approved by CoStar Group.

  • Healthcare Strength Healthcare coverage is described as extensive, spanning medical, dental, vision, and prescription plans, with additional life and supplementary insurance options. Mental health counseling and wellness incentives are also part of the package, reinforcing the sense of strong health support.
  • Wellbeing & Lifestyle Benefits Lifestyle perks include commuter and gym reimbursements and daily lunch, alongside office snacks/drinks and company social events. Fitness stipends and wellness programs add to the perceived day-to-day value of the rewards package.
  • Equity Value & Accessibility Opportunities to become a shareholder via stock-related programs are highlighted as a meaningful element of total rewards. Equity and employee stock purchase options are positioned as an additional path to value beyond base pay.

CoStar Group Insights

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The Company
Arlington, VA
6,500 Employees
Year Founded: 1987

What We Do

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.

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