Lead Software Developer, Costar Group - London

CoStar Group, Inc.; City of London; On-site; GBP 70,000 - 90,000; Full time

Job summary

A leading real estate information provider in London is seeking a Lead Software Developer to design and develop applications that handle large data sets. The ideal candidate will have extensive experience in .NET development and SQL Server, coupled with a passion for mentoring and fostering innovative solutions. This role provides an excellent working environment, competitive salary, and attractive benefits, including private medical cover and generous leave policy.

Benefits

Private medical cover

Dental cover

Life assurance

Competitive pension

Season ticket loans

Enhanced maternity and paternity pay

Qualifications

• 5+ years of .NET development experience.
• 3+ years working with SQL Server and writing SQL queries.
• Experience with cloud-based databases and data engineering.

Responsibilities

• Design, architecture, and development of applications.
• Work on API-driven systems handling massive data.
• Collaborate with QA to ensure software quality.
• Deliver defect-free products with optimal performance.

Skills

.NET development (C#)

SQL Server

Cloud-based databases

Database design

Data modeling

ETL strategies

Mentoring

Big data solutions

Education

Bachelor’s Degree or equivalent experience

Tools

.NET Core

Python

AWS

Databricks

NoSQL databases

Jupyter notebook

Job description

Lead Software Developer, Costar Group - London

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 and NASDAQ 100, CoStar Group is on a mission to digitize the world’s real estate, empowering people to discover properties, insights and connections that improve their businesses and lives. With over 35 years of experience, we provide the most comprehensive data to help commercial real estate professionals make confident decisions.

Responsibilities

• Deeply understand what drives the business for which you are building software.
• Hands‑on involvement in design, architecture, and development activities for applications across the research process.
• Work on big, distributed, API‑driven systems that operate on massive amounts of data in high transaction volume applications for tens of thousands of users, producing robust, efficient, and maintainable code.
• Collaborate with QA resources to ensure the software you deliver is of the highest quality.
• Act as a key member of the product launch team and work closely with DevOps to resolve operational issues.
• Deliver work products that meet specifications, are defect‑free, and have optimal performance.
• Take an active role in mentoring other developers.

Qualifications

• Bachelor’s Degree or equivalent experience.
• 5+ years of .NET development (C#) with cross‑platform communication technologies such as Web API.
• 3+ years of experience with SQL Server, writing SQL queries, data matching/cleansing/enriching as well as ETL/data pipeline engineering.
• A demonstrable track record of building and launching successful products that leverage terabytes of data.
• Ability to analyze technical requirements and design new architectures, data models, and ETL strategies.
• Expertise in database design, complex T‑SQL programming, performance tuning, and index analysis.
• Hands‑on experience with cloud‑based relational and non‑relational databases.
• Facilitate discussions among developers to exchange ideas and introduce innovative technologies.
• Evaluate emerging technologies to identify opportunities, trends, and best practices.
• Experience with .NET Core, Python, Jupyter notebook, AWS and NoSQL databases.
• Experience with Databricks and Lakehouse architecture.

What’s in it for you?

Working at CoStar Group means enjoying a culture of collaboration and innovation, an outstanding working environment based in the Blue Fin or one of our UK‑wide hubs. Other perks include full private medical cover, dental cover, life assurance and member rewards; 28 days annual leave; a competitive pension; season ticket loans; enhanced maternity and paternity pay; and more.

CoStar Group is an Equal Employment Opportunity Employer; we maintain a drug‑free workplace and perform pre‑employment substance abuse testing. All qualified applicants will receive consideration for employment without regard to race, color, religion, gender identity or expression, sexual orientation, national origin, genetics, disability, age, or veteran status. We encourage applications from women, disabled, and Black, Asian and Minority Ethnic (BAME) candidates, as these groups are underrepresented in the commercial real estate industry. If you are a qualified individual with a disability or a disabled veteran, you may request a reasonable accommodation. For instructions on how to apply, visit our careers site.