# RJJ Software

## Who We Are


RJJ Software Ltd is a technology consultancy based in Leeds, working with small and medium enterprises, high-growth startups, and investors across the UK and beyond. Founded in 2018 (Companies House 11599743), the company pairs strategic advice with hands-on engineering experience, so recommendations are grounded in how software actually gets built.

Much of the writing published under this byline is in the company's voice: announcements, award news, and work that reflects the wider team rather than a single author.

## What We Do


The work spans fractional CTO engagements, technical due diligence, architecture and security reviews, and helping teams adopt AI-assisted and agentic development on their own codebases — safely, and with measurable results. RJJ Software works across .NET, Ruby on Rails, and Python, and emphasises knowledge transfer over consulting dependency.

## Recognition


RJJ Software has been named [Best Strategic SME Tech Consultancy 2025](/news/rjj-software-recognised-as-best-strategic-sme-tech-consultancy-2025/), recognised as a [top five software development company in Leeds by DesignRush](/news/rjj-software-recognized-as-a-top-five-software-development-company-in-leeds-by-design-rush/), and awarded an [Education Award by the West and North Yorkshire Chamber of Commerce](/news/rjj-software-wins-education-award-at-west-and-north-yorkshire-chamber-of-commerce-raising-the-bar-awards/) for its work developing the next generation of engineers.

## Beyond Client Work


RJJ Software produces [The Modern .NET Show](https://dotnetcore.show/), one of the longest-running podcasts about modern .NET development, and maintains [OwaspHeaders.Core](https://www.nuget.org/packages/OwaspHeaders.Core/), an open-source security-headers library for ASP.NET Core with over 1.9 million downloads.