Software Engineer- CoStar- Arlington, VA at CoStar
Arlington, VA
$103,000–$154,000from the description
Jul 1, 2026
Arlington, VA
Jul 21, 2026
What this job asks for AI summary
A mid-level software engineering role focused on building and maintaining high-traffic commercial real estate web applications. Day-to-day work spans front-end and back-end development across a modern stack, contributing to CI/CD pipelines, code reviews, and mentoring junior engineers. Suited to engineers with at least three years of production experience who are comfortable working across cloud infrastructure and agile delivery practices.
Mid level · 3+ years · Washington-Arlington-Alexandria, DC-VA-MD-WV · Bachelor's required · Full-time
“or” means any one of them counts — you don't need all of them.
We read this from the posting text with AI. Skim the description below before ruling yourself out.
How this req sits in the market our data
Rare in this occupation — lead with these, and say what you built with them.
Most people in this occupation already list these. Still required — just not what gets you shortlisted.
What the occupation pays Median $158,337 (middle half $126,441–$180,105). This posting is about at that midpoint.
Estimated from BLS employment for this occupation and area, per-skill prevalence across our listing corpus, and published wage benchmarks — as of Jul 28, 2026. It is a model, not a headcount.
Why we read it this way (5)
The Basic Qualifications list a broad technology stack ('like React, Vue, TypeScript, NodeJS, C#, .Net, OpenSearch, Kafka, SQL, NoSQL') with the word 'like' introducing it — this is a substitution-qualifier context, so the named tools are treated as hard gates on those capability areas rather than strict single-tool requirements. React and Vue are captured as alternatives for the same front-end requirement.
The role is titled simply 'Software Engineer' with no level modifier, so advertised seniority is Unspecified. The 3+ years requirement and mentoring responsibilities support a Mid-level classification.
The posting specifies the role is onsite Monday–Thursday in Arlington, VA with optional WFH on Fridays; it is not fully remote.
The degree requirement is explicitly stated as a Bachelor's from an 'accredited, not for profit, in-person university or college' — equivalent experience is not offered as a substitute.
Preferred qualifications include experience with a large enterprise codebase, React and/or Node.js specifically, and Commercial Real Estate knowledge — these are listed under 'Preferred Qualifications and Skills' and are not hard gates.
Read the full posting
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