Lead Software Developer

Salary: £68,000 - 108,000 per year

Requirements:

• Bachelors degree or equivalent experience.
• A track record of commitment to prior employers.
• 5+ years of .NET development (C#) experience, including cross-platform communication technologies such as Web API.
• 3+ years of experience with SQL Server, including writing SQL queries, data matching, cleansing, enriching, and ETL/data pipeline engineering.
• A demonstrable track record of building and launching successful products that leverage terabytes of data.
• Ability to analyse 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.
• Experience with .NET Core, Python, Jupyter Notebook, AWS, and NoSQL databases.
• Experience with Databricks and Lakehouse architecture.

Responsibilities:

• Deeply understand what drives the business for which we are building software.
• Take hands-on responsibility for design, architecture, and development activities across the Research Process applications.
• Work on big, distributed, API-driven systems operating on massive amounts of data in high transaction volume applications for tens of thousands of users.
• Produce robust, efficient, and maintainable code using our primary tools: C#, .NET Framework, Python, JSON, SQL Server, AWS, and Databricks.
• Collaborate with our QA resources to ensure the software we 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 free of defects, and have optimal performance.
• Take an active role in mentoring other developers.
• Facilitate discussions among developers to exchange ideas and introduce innovative technologies.
• Evaluate emerging technologies to identify opportunities, trends, and best practices that can strengthen our technology platform and development practices.

Technologies:

• .NET Framework
• API
• AWS
• C#
• Cloud
• Databricks
• DevOps
• ETL
• JSON
• Jupyter
• NoSQL
• Python
• SQL
• Web
• ASP.NET

More:

We are CoStar Group, a leading global provider of commercial and residential real estate information, analytics, and online marketplaces. We are based in London, with an outstanding working environment in the Blue Fin or one of our key UK-wide hubs. We offer a culture of collaboration and innovation, along with benefits including full private medical cover, dental cover, life assurance, member rewards, 28 days annual leave, a competitive pension, season ticket loans, enhanced maternity and paternity pay, and more. We also promote equality and welcome applications from people of all backgrounds.

last updated 35 week of 2026