About
THEY.dev is a custom software agency from the UK and Poland, with 70+ delivered projects since 2017 across web, mobile, and AI.
What we do
We build operational systems mostly on React and Java, taking a consulting approach: we help clients decide what to build, not just how to build it. Every engagement starts with proper design and discovery, mapping the business logic and defining scope before anyone writes code. We also handle practical AI integrations: agents, data automation, and internal knowledge bases.
Our specializations
- Operational systems on React and Java
- Design and discovery: business-logic mapping and scoping before development
- AI integrations: agents, data automation, internal knowledge bases
Who we work with
Clients who need an operational system built and then kept running. Most work with us for years.
Industries we serve
Retail, finance, and software and technology, plus medtech and the charitable sector.
How we work
Delivered work includes a fundraising platform for a UK charity network, an automated histology platform for a medtech company, and a KYC/AML compliance SaaS. 31 verified 5.0 reviews on Clutch.