Senior Software Engineer (React)- Research Development

Overview

Build and maintain high‑performance React/TypeScript web applications for CoStar's CRM.

Key Responsibilities

• code review
• mentoring
• component library
• react development
• testing
• tech evaluation

Tasks

-Participate actively in code reviews, pair programming, and agile ceremonies. -Take an active role in mentoring other developers. -Collaborate with cross-functional teams including designers, backend developers, and product managers to transform business needs into technical solutions. -Contribute to and maintain shared component libraries and front-end architecture. -Build reusable, scalable, and secure UI components and libraries with a focus on maintainability and performance. -Develop and maintain engaging, responsive, and high-performance web applications using React, TypeScript, and Tailwind CSS. -Continually evaluate emerging technologies to identify opportunities, trends, and best practices that can be leveraged to strengthen CoStar’s technology platform and development practices. -Write comprehensive unit and integration tests using tools like Jest, React Testing library.

Requirements

• react.js
• typescript
• ci/cd
• git
• aws
• bachelor’s

What You Bring

-Deep understanding of HTML, CSS, JavaScript, and responsive design. -Hands-on experience with CI/CD pipelines and version control using Git. -Experience in unit, performance and automation testing. -Experience with any state management libraries like Redux, Context API. -Solid understanding of RESTful APIs and familiarity with front-end build tools (e.g., Webpack, Babel). -Strong proficiency in React.js, TypeScript and Tailwind CSS. -Be a subject matter expert in front-end technology stack. -Excellent communication, collaboration, and problem-solving skills. -Experience with .NET Core and SQL Server with the ability to integrate front-end components into a scalable, secure, and maintainable backend architecture -Experience with Relational Database Management Systems (SQL Server) and Document Data Systems (Dynamo, Elastic Search) a plus. -Experience with AWS S3, Lambda, SQS, Kafka, Redis. -A track record of commitment to previous employers. -Bachelor’s Degree required from an accredited, not for profit university or college -Strong grasp of web standards, accessibility, and security best practices. -Comfortable working across the stack with Node.js on the server-side -Experience working in Agile development environments. -5+ years of production development experiencing using modern front-end frameworks.

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Benefits

-Paid time off -Comprehensive healthcare coverage: Medical / Vision / Dental / Prescription Drug -Tuition reimbursement -Employee stock purchase plan -Complimentary gourmet coffee, tea, hot chocolate, fresh fruit, and other healthy snacks -Commuter and parking benefits -Virtual and in person mental health counseling services for individuals and family -Access to CoStar Group’s Diversity, Equity, & Inclusion Employee Resource Groups -401(K) retirement plan with matching contributions -Life, legal, and supplementary insurance -On-site fitness center and/or reimbursed fitness center membership costs (location dependent), with yoga studio, Pelotons, personal training, group exercise classes

About Costar

-Specializes in providing data, research, and insights for commercial real estate professionals. -Operates the largest online commercial real estate marketplace, offering listings and analytics tools. -Known for its innovative approach to tracking property values, trends, and market dynamics. -Focused on transforming real estate with advanced data and technology solutions to drive smarter decisions. -Regularly produces detailed market reports and insights for professionals across sectors such as office, retail, and multifamily housing. -Boasts a strong presence with offices across North America, Europe, and Asia Pacific. -Acquired several key companies, including LoopNet, Apartments.com, and Ten-X, strengthening its market position. -Known for comprehensive property databases that cover millions of commercial and residential listings globally. -Has a reputation for high-quality research that serves investors, brokers, property managers, and other industry stakeholders.

Sector Specialisms

Visa Sponsorship

-no visa sponsorship will be provided.