πŸ‡¬πŸ‡§ ZetsApp in London

Software Development Company in London, United Kingdom

ZetsApp is a software development company serving London and the wider UK and EU. We build GDPR-safe custom software, AI and RAG systems, and full-stack platforms β€” with UK-hour delivery, EU-region hosting, and clear IR35-friendly engagement models.

Engineering that respects GDPR by design

UK and EU teams operate under GDPR, the UK Data Protection Act, PECR, and often FCA, MHRA, or sector-specific regimes. Our engineers ship with those constraints in mind from day one β€” EU-region hosting, data-processing agreements, DPIA-ready architectures, encryption in transit and at rest, and clear controls over which subprocessors touch personal data.

On-prem and open-source LLMs for regulated industries

For UK legal, financial, and healthcare buyers, sending customer data to a third-party model is often unacceptable. We build RAG pipelines that run entirely inside your perimeter, with open-source models (Llama 3, Mistral, Qwen) hosted on your own infrastructure or a UK-region AWS / Azure tenancy. PII redaction, query logging, and access controls are built in.

IR35-friendly, GBP invoicing, London-hour delivery

Our standard engagement is a B2B service contract β€” outside IR35 for typical project work β€” with clear scope, deliverables, and control resting with our supplier entity. We invoice in GBP, EUR, or USD, keep London business hours, and can meet in London for workshops and reviews where useful.

What our London clients typically need

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GDPR-safe delivery, day one

DPIA-ready architectures, DPAs, and lawful-basis mapping baked into every engagement.

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FCA-aware fintech builds

Consumer-duty flows, KYC/AML integrations, and regulated-message controls for UK fintechs.

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NHS & MHRA-aware healthcare

DTAC / DSPT-friendly architectures, encrypted patient portals, and audit trails.

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On-prem RAG & LLM deployment

Open-source model deployment inside your UK/EU perimeter β€” no data leaves the tenancy.

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ISO 27001 / SOC 2 readiness

Access reviews, change management, DR, and incident response ready for audit.

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AWS eu-west / Azure UK South

EU-region deployment with UK-aware DPAs and Standard Contractual Clauses handled.

Services we deliver in London

Industries we serve locally

Fintech & FCAHealthcare & NHSLegal & LegalTechInsurancePropTechE-Commerce & RetailMedia & PublishingPublic Sector

Also serving

Frequently asked questions

Are your engagements GDPR-compliant?

Yes. We deliver with EU-region hosting, data-processing agreements, DPIA-ready architectures, and clear controls over which subprocessors touch personal data. Our engineers routinely ship for regulated UK and EU clients.

Is the engagement outside IR35?

Our standard model is a B2B service contract β€” outside IR35 for typical project work β€” with clear scope, deliverables, and control resting with our supplier entity, not with the client. We can provide the CEST and SDS supporting documentation your finance team asks for.

Can we host on UK / EU infrastructure only?

Yes. AWS eu-west-1 (Ireland), eu-west-2 (London), Azure UK South and UK West, or GCP europe-west2 (London) β€” with SCCs and UK IDTA where applicable. On-prem or private-cloud deployment is available for AI workloads that must stay off public cloud.

Can you run RAG entirely inside our UK tenancy?

Yes. For regulated industries we deploy RAG pipelines and open-source LLMs (Llama, Mistral, Qwen) inside your UK-region AWS or Azure tenancy or your on-prem infrastructure. No customer data touches a third-party model API.

Do you invoice in GBP?

Yes. GBP, EUR, and USD invoicing all supported.

Are your developers UK-time-zone aligned?

Our UK-serving team overlaps the full London business day. For lighter engagements, at least 5–7 hours of overlap is standard.

Start your London project with a free consultation

Talk to an engineer in your time zone and get a clear, fixed-scope proposal within 48 hours.

Contact ZetsApp β†—