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LLM DEVELOPMENT · UK
LLM Development Company in the UK
Large language models such as GPT, Claude, Gemini and Llama can read, write and reason with text at a level that was impossible a few years ago. We turn them into reliable business software. Our team is in Milton Keynes and works with companies across the UK.
- UK GDPR compliant
- Works with your tools
- You own the code
REAL CLIENT RESULTS
Trusted by UK Businesses Using Our LLM Development
Numbers from projects we have delivered for UK businesses, from recruitment and accountancy to solar energy and field service software.
58%Less screening timeRecruitment
97%Faster lead responseSolar energy
72%Less time chasing recordsAccountancy
8 wksFrom notes to launchField service software
Areas we cover
Based in Milton Keynes, building AI for businesses nearby in Bletchley, Wolverton, Newport Pagnell, Stony Stratford, Buckingham, Bedford, Northampton and Olney, and across the UK in London, Birmingham, Manchester, Leeds, Liverpool and Lichfield.
IN PLAIN ENGLISH
What Is LLM Development – and What We Do Differently
LLM development is building software around large language models: choosing the model, writing and testing prompts, connecting it to your data and controlling cost and risk. We are model-neutral. We test several models on your own examples and recommend the one that gives the best results for the money, then keep it under review as new models appear.
SOUND FAMILIAR?
Business Problems Our LLM Development Solves
Results Good in a Demo, Inconsistent in Real Use
The first ten tries look great, the next hundred include some odd answers. Structured prompts, checks and tests make results consistent.
Rising Bills from AI APIs
Using the biggest model for everything gets expensive. Routing simple jobs to smaller models can cut costs sharply.
Data That Cannot Leave Your Control
Some data should never go to a public API. Private hosting and open-source models keep it on servers you control.
WHAT WE BUILD
Our LLM Development Services
Large Language Model Applications
Business apps built around LLMs for drafting, summarising, classifying and answering.
LLM Integration
GPT, Claude or Gemini connected to your software, CRM and data through secure APIs.
LLM Fine-Tuning
Models trained on your examples for a consistent format, tone or specialist task.
Open-Source LLM Implementation
Llama, Mistral and other open models deployed privately on your own infrastructure.
LLM Optimisation
Lower cost and faster responses through model routing, caching and prompt tuning.
Prompt Engineering & Testing
Prompts written, versioned and tested against real examples before release.
Model Evaluation & Selection
Side-by-side tests of several models on accuracy, speed and cost for your tasks.
Guardrails & Safety
Checks for sensitive data, off-topic requests and unsupported answers.
Find Out What AI Can Automate in Your Business
A free audit shows the tasks worth automating first, with the hours each one should save.
WHO USES IT
LLM Use Cases by Department
LLM for Sales Teams
Proposal drafts, call notes and follow-up emails written by a language model that knows your products and tone.
LLM for Marketing Teams
Product descriptions, ad variations and content briefs produced in your brand voice and checked before they go out.
LLM for Customer Support
Ticket sorting, reply drafts and sentiment tagging, so urgent and unhappy customers reach a person first.
LLM for Operations & Admin
Long reports, emails and forms summarised into the few lines a manager needs to make a decision.
LLM for Finance & Reporting
Contracts and statements read for key terms, dates and amounts, with each figure linked back to its page.
LLM for HR & Recruitment
Job adverts, CV summaries and interview question sets written to your criteria and reviewed by your team.
CASE STUDIES
LLM Development Results: Client Case Studies
Real projects, real numbers. Client names are kept private where they asked us to.
Recruitment: 58% Less CV Screening Time with an AI Platform
58%Less screening time
92%CVs imported automatically
A specialist UK recruitment agency now has CVs pulled in, ranked and explained by AI, so recruiters spend their day on calls instead of reading.
Read the case studyAccountancy: 72% Less Time Chasing Client Records
72%Less time chasing records
29%Faster year-end turnaround
A UK accountancy practice replaced email chasing with a portal that sends its own reminders and collects documents in one place.
Read the case studyField Service SaaS: Launched in Eight Weeks, 38% Less Admin
8 wksFrom notes to launch
24%Trial-to-paid conversion
Vantro went from a founder’s notes to paid software for UK trade businesses, with scheduling, quotes and invoices built in.
Read the case studyGet Similar Results for Your Business
Tell us which job takes your team the most time. We will show you what can be automated.
HOW WE WORK
How Our LLM Development Process Works
AI Opportunity Audit
We look at the task, your data and your limits on cost, speed and privacy, then test a few models on real examples.
Roadmap & ROI Forecast
You get a plan showing which model we recommend, how it will be hosted, the expected cost per month and the benefit.
Build & Integrate
We build the prompts, guardrails and integration, and fine-tune or adapt the model where testing shows it is worth it.
Test, Train Your Team & Launch
We measure output against a test set your team approves, train users and launch with usage and cost limits in place.
Monitor, Optimise & Scale
We monitor quality, latency and spend, and move to newer or cheaper models when they do the job as well.
TECHNOLOGY
AI Models & Platforms We Work With
We are not tied to one vendor. We choose on accuracy, cost and where your data needs to live.
AI Models (OpenAI GPT, Claude, Gemini, Llama)
Commercial and open-source models, compared on your own data before we recommend one.
Hosting & Fine-Tuning Platforms
Azure OpenAI, AWS Bedrock, Google Vertex AI, Hugging Face and self-hosted GPUs for private models.
CRMs & Business Tools
HubSpot, Salesforce, Zoho, Microsoft 365, Google Workspace and your own databases and apps.
WHY CODECRACKERS
Why UK Businesses Choose Us for LLM Development
Custom-Built AI, Not Expensive Off-the-Shelf Subscriptions
Your LLM development is built for your processes and you own it. No per-seat licence that grows every time you hire.
Works Inside Your Existing Tools
We connect to the CRM, inbox, help desk and files your team already uses, so nobody has to learn a new system to get the benefit.
UK GDPR-Compliant AI Systems
Data stays in UK or EU hosting where needed, access is limited to what each part needs, and we document how personal data is handled.
ROI-First Approach with Measurable Results
Before we build, we agree what success looks like in hours saved, response time or revenue, and we report against it every month.
PRICING
LLM Development Packages & Pricing
Clear starting prices. Every project gets a fixed quote after the free audit, before any work begins.
Free LLM Development Audit
A 45-minute call and a short written report: where LLM development would help, what it would cost and the likely payback.
Book my free auditMost popular
90-Day LLM Build Package – From £7,000
Audit, roadmap, build, testing, training and launch of your first solution, with a fixed price agreed before we start.
Get a quoteMonthly LLM Development Retainer – From £700/month
Monitoring, improvements, new features and support every month, with a report on usage, accuracy and time saved.
Get a quoteBook Your Free Audit
45 minutes, no obligation. You keep the report either way.
INDUSTRIES
Industries We Build LLM For
Sectors where we already have live client work.
- RecruitmentCV screening, candidate ranking and shortlists.
- Solar and renewable energyLead capture, instant replies and survey booking.
- Accountancy and financeDocument collection, reminders and client portals.
- Trades and field serviceScheduling, quotes, invoices and job admin.
- Ecommerce and retailProduct data, customer queries and order updates.
- Health and wellnessBooking questions, product advice and follow-ups.
CLIENT REVIEWS
What Our Clients Say About Our LLM Development
“Our recruiters used to spend most of the day downloading and reading CVs. Now the platform pulls them in, ranks them and explains why, and we just make the calls.”
“We were losing good leads simply because we couldn’t reply fast enough. CodeCrackers connected our ads, website and CRM so every enquiry gets an answer in minutes.”
“Clients upload everything in one place, reminders go out on their own, and we can finally see every deadline coming.”
“I knew exactly what tradespeople needed but had no idea how to build it. CodeCrackers turned my notes into Vantro, and we launched in eight weeks.”
FAQs
LLM Development FAQs
FREE AUDIT
Ready to Put AI to Work? Book Your Free LLM Development Audit
Tell us about your business and the work that eats your team’s time. We will reply within one working day with a time for your free audit.
- A list of tasks worth automating
- Expected hours saved and payback
- A fixed quote, no obligation
Book your free audit
Four quick details. No obligation.