# THEY.dev

> A UK- and Poland-based software development agency with a consulting approach, building web, mobile and AI-powered software for businesses across the full product lifecycle, from first idea and clickable prototype to live, maintained software.

THEY.dev is the trading name of TH-EY S&D LTD (company number 11033177), founded in 2017 by Filip Kubala (CEO) and Wojciech Soczyński (CTO), with headquarters in London and Kraków. The team of 25+ specialists and associates has delivered 60+ software projects, most clients stay 3 or more years, and the company holds a 5.0 rating from 31 Clutch reviews. Core stack: React and TypeScript on the frontend, Java and Spring on the backend, React Native for mobile, on AWS, Google Cloud or Azure. AI is used selectively, on paid business-tier services that do not train on client data, and clients can opt out.

Full details on services, process, pricing, security, IP ownership and case studies: [llms-full.txt](https://www.they.dev/llms-full.txt)

## Services

- [Design & Discovery](https://www.they.dev/services/design-discovery/): turning concepts into clickable prototypes, UI/UX design and scoping; where most projects start
- [Proof of Concept](https://www.they.dev/services/proof-of-concept/): idea validation and an honest feasibility check before larger investment
- [Minimum Viable Product](https://www.they.dev/services/minimal-viable-product/): the first live, usable version with core features, ready to scale
- [Custom Software Development](https://www.they.dev/services/custom-software-development/): ongoing agile development with a dedicated team and extended QA
- [Support & Maintenance](https://www.they.dev/services/support-maintenance/): monitoring, SLAs, updates, fixes and reporting after launch
- [Quality Assurance Audit](https://www.they.dev/services/quality-assurance/): test cases, security report and prioritised bugs; fixed packages from £700
- [Team Augmentation](https://www.they.dev/services/team-augmentation/): developers, designers, QA and a Fractional CTO embedded in the client's team

## Portfolio

- [Portfolio](https://www.they.dev/portfolio/): all case studies with stack, scope and results
- [Localgiving](https://www.they.dev/portfolio/localgiving/): fundraising and grant platform for 2,200+ UK charities with an AI grant writing assistant
- [HelloHosty](https://www.they.dev/portfolio/hello-hosty/): AI-powered guest communication and property management for short-term rentals
- [Parliamentary Research Service](https://www.they.dev/portfolio/prs-lite-web-app-for-parliamentary-research-management/): document and workflow management platform
- [Enforcio](https://www.they.dev/portfolio/enforcio-kyc-aml-compliance-saas-platform/): KYC and AML compliance SaaS
- [M01](https://www.they.dev/portfolio/m01/): restaurant ordering apps for iOS and Android, POS and back office, used across Finland

## Company

- [Team](https://www.they.dev/team/): founders and team members with their roles and specialisms, plus the company's story
- [Why THEY.dev](https://www.they.dev/why-they-dev/): access from day one, default security practices, QA and the development process
- [Pricing](https://www.they.dev/pricing/): how projects are estimated and billed (Fixed Price, Time and Materials, retainer)
- [FAQ](https://www.they.dev/faq/): cost, timelines, IP ownership, hosting, GDPR, NDAs and handover
- [Contact](https://www.they.dev/contact-us/): book a free consultation, or email hello@they.dev

## Legal

- [Legal Information](https://www.they.dev/legal-information/): company number, VAT number and registered office
- [General Terms and Conditions, UK entity](https://www.they.dev/general-terms-and-conditions-of-services-v-2-0/): terms for TH-EY S&D LTD
- [General Terms and Conditions, PL entity](https://www.they.dev/ogolne-warunki-swiadczenia-uslug/): terms for TH-EY POLAND sp. z o.o. (in Polish)
- [ISMS Policy](https://www.they.dev/information-security-management-system-policy/): information security policy aligned with ISO/IEC 27001:2022
- [Privacy Policy](https://www.they.dev/privacy-policy/)

## Optional

- [Blog](https://www.they.dev/blog/): case studies, AI agents, cloud cost optimisation and how the team works
- [Team augmentation case study](https://www.they.dev/blog/team-augmentation-case-study/): productive in days, not months
- [AWS cost optimisation](https://www.they.dev/blog/aws-cost-optimisation-how-we-reduced-customers-bill-by-7k/): how a customer's AWS bill was cut by $7k
- [Legacy ASP.NET to Laravel with Claude Code](https://www.they.dev/blog/migrate-aspnet-laravel-claude-code/): a legacy migration without breaking anything
- [How developers use AI in 2026](https://www.they.dev/blog/how-developers-use-ai-for-custom-software-development-in-2026/): AI in day-to-day custom software development
- [Featured in](https://www.they.dev/featured-in/): Disrupt Magazine article and profiles on Clutch, GoodFirms and TechBehemoths
- [Clutch reviews](https://clutch.co/profile/theydev#reviews): 31 verified client reviews