Our optional care plans roll month-to-month and can be paused or cancelled with 30 days' notice. Fixed-fee build projects follow the milestones and cancellation terms agreed in their project scope.

SaaS & MVP development · AI automation

Got an idea for an app or SaaS product? We'll build the first working version.

Q: Is this just a ChatGPT wrapper?

No. Off-the-shelf chatbots fail in business because they lack connection to your real tools, produce unreliable answers, and cannot execute multi-step workflows. We build integrated automation systems: your AI agent is securely connected to your email, CRM, WhatsApp, or booking calendar with deterministic guardrails so it only answers what it knows and escalates gracefully to a human when needed.

Q: What happens to my data? Is this GDPR compliant?

We design systems to support your UK GDPR obligations, but the right setup depends on the data you process and the services involved. During discovery we agree access controls, retention, subprocessors and available model-training settings. These requirements are then recorded in the project scope and data-processing terms.

Q: Do I need any technical knowledge to work with you?

None at all. We handle the entire technical setup, integrations, prompt engineering, and testing. During onboarding, we simply need 15–30 minutes of your time to understand how your business currently operates and which tasks drain the most time. After launch, we provide clear walkthroughs and handle ongoing maintenance.

Q: What if it doesn't work for my business?

We de-risk the process before you commit to a major package. You can start with our £195 Quick-Win Audit, where we identify high-impact opportunities and, where technically suitable, create one small proof of concept. If you proceed to a Growth or Scale package, the £195 is fully credited toward your setup fee. If not, you keep the written audit and any proof of concept produced.

Q: How is this different from Zapier/Make DIY tools?

DIY tools like Zapier and Make work well for simple 2-step tasks (like copying a form submission into a spreadsheet). However, they quickly become brittle when handling unstructured customer messages, document parsing, or AI reasoning. We build custom-engineered workflows with fallback handling, error monitoring, and bespoke integrations that don't break when a customer formats their message unexpectedly.

Q: Can we start with a fixed project and transition to monthly services later?

Yes. You can start with our fixed-price entry audit (£195) or a standalone project build, and transition into our rolling monthly care plan whenever you're ready for ongoing support, monitoring, and regular workflow additions.

Q: Do we retain complete IP ownership?

You own the bespoke deliverables created for your project once agreed fees are paid, subject to third-party services and open-source licences. We provide documented handover and transferable project access where the relevant provider allows it.

Got an app or SaaS idea? We'll build the first working version.

Already running a business?

Automate the repetitive work slowing it down.

Clear scope, fixed pricing and senior engineers throughout.

Explore SaaS & MVP Explore automation

Most standard projects live in 2–3 weeks · No obligation

Scope agreed first Fixed setup price Optional monthly care

The Reality For Growing UK Businesses

What are you trying to move forward?

Launch a focused product or improve the business you already run.

Product idea

You have an app idea but no technical team

Turn a focused concept into a working first version without searching for a technical co-founder.

MVP validation

You need something real to test with users

Move beyond mockups with a usable MVP built around the smallest sensible launch scope.

Automation

Repetitive work is consuming useful time

Automate routine enquiries, documents, reporting and operational handoffs while keeping people in control.

Connected systems

Your existing tools do not work together

Connect the inboxes, calendars, CRMs and internal systems your team already depends on.

Product idea

You have an app idea but no technical team

Turn a focused concept into a working first version without searching for a technical co-founder.

MVP validation

You need something real to test with users

Move beyond mockups with a usable MVP built around the smallest sensible launch scope.

Automation

Repetitive work is consuming useful time

Automate routine enquiries, documents, reporting and operational handoffs while keeping people in control.

Connected systems

Your existing tools do not work together

Connect the inboxes, calendars, CRMs and internal systems your team already depends on.

← Swipe to explore bottlenecks →

SELECTED PROJECTS

The problem, build and outcome: at a glance.

Browse project work without opening long case studies. Every card shows what the client needed, what we built and the practical result.

EdTech / Grading Automation

ClassPilot

Project contact: Benjamin

Automated student assessment marking with real-time feedback and teacher override

OutcomeTeacher-led

Automated marking with manual review and override

Problem

Teachers were spending large amounts of manual time grading student submissions by hand, leading to delayed student feedback and burnt-out educators.

What we built

Engineered an automarking system using Gemini Vision for visual and text assessment, structured JSON streaming for live rubric scoring, teacher override checkpoints, and admin/teacher RBAC.

Gemini VisionStructured JSON StreamingMulti-Role RBAC+2

Enterprise AI Platform

Genial AI

Project contact: Fabien

Multi-tenant platform letting enterprises deploy teams of task-specific AI agents

OutcomeMulti-Agent

Separate agents, data and permissions by workspace

Problem

Enterprises required multiple specialised AI agents rather than one generic chatbot, configured for distinct departmental workflows and securely partitioned across team workspaces.

What we built

Architected a scalable multi-tenant SaaS platform where admins can spin up custom agents, define bespoke system prompts, mount specific data sources, and manage team permissions.

Multi-Tenant SaaSPer-Agent System PromptsNext.js 15+2

AI Brand Strategy / Audit

Prism

Project contact: Aaron Evans

Autonomous 4-stage brand audit from a single URL to a full, data-backed strategy in minutes

Outcome4 stages

From URL analysis to a structured brand audit

Problem

Brand audits are normally slow, expensive, and frequently rely on subjective or generic AI opinion rather than verifiable evidence.

What we built

Engineered an autonomous multi-stage pipeline using Claude and Gemini to scrape, analyze, cross-examine market positioning, and synthesize revenue-leak insights with strict data privacy.

Anthropic ClaudeGeminiMulti-Stage Autonomous Pipeline+2

Healthcare / Clinic Operations

Frontdesk AI

Project contact: Justin

End-to-end clinic operations platform combining voice booking, retrieval Q&A, and daily briefings

Outcome8 Workflows

Connected automations for clinic operations

Problem

Healthcare clinics required a reliable operations system that could answer patient queries accurately from genuine protocol documents, refuse questions not covered by those documents, automate voice booking, and produce daily management briefings.

What we built

Architected a hybrid RAG pipeline on pgvector and Cohere with deterministic refusal guards, connected to a Vapi conversational voice agent, multi-agent LangGraph orchestrator, custom MCP server, and Supabase backend.

pgvectorVapi Voice Agentn8n (8 Workflows)+4

LegalTech

Legal Research Platform

Project contact: David

Direct API integration with LexisNexis and case law databases for verified citations

OutcomeSource-led

Research output linked back to legal sources

Problem

Attorneys cannot use generic generative AI tools because ungrounded LLMs frequently hallucinate legal citations or misquote statutory precedents.

What we built

Implemented deterministic retrieval pipelines that query official legal APIs, cross-reference judicial opinions, extract verified holdings, and present verifiable hyperlinked sources for human legal review.

LexisNexis APICase Law Database APIsPython+2

Conversational career guidance interface with structured steps

Conversational AI / Guidance

Career Guidance Chatbot

Production conversational AI providing structured, actionable student career pathways

OutcomeLive

Deployed in production on Railway infrastructure

Problem

Students seeking guidance were overwhelmed by unstructured career sites and walls of generic text that failed to provide actionable next steps.

What we built

Developed a structured conversational assistant that parses student interests, guides them through discovery questions, and outputs cleanly formatted action plans.

PythonOpenAIRailway+1

Backend & Cloud Infrastructure

Persona AI

Personality-assessment SaaS running on a 71-function serverless backend with Big Five scoring

Outcome71 functions

Serverless backend mapped, repaired and documented

Problem

The client needed a resilient, high-concurrency cloud architecture to score complex personality assessments in real time, securely store sensitive PII, and handle recurring subscriptions smoothly.

What we built

Engineered a distributed serverless architecture on AWS Lambda with PostgreSQL column encryption, algorithmic psychometric normalization, and automated Chargebee subscription hooks.

AWSNode.jsPostgreSQL+2

CLIENT REVIEWS

Feedback from founders and operators

Short summaries of client feedback from software, AI agent and workflow projects.

1 / 5

ClassPilot

Benjamin, Founder

What mattered to me was keeping teachers in control. That was understood from the start, and the handover was straightforward.

Genial AI

Fabien, Founder

Working with Mentallion was refreshingly straightforward: clear updates, sensible decisions and no chasing for progress.

Prism

Aaron Evans, Founder

I only had a rough idea when we started. By the end, I had something working that I could actually use.

Frontdesk AI

Justin, Founder

Fallbacks were not treated as an afterthought. That made a real difference, and the system is easier for our team to manage now.

Legal Research Platform

David, Lead Counsel & Founder

What I appreciated most was the restraint. Not every problem was treated as an AI problem, and source-checking stayed central.

Persona AI

Marcus, Co-Founder

The backend was complicated, so I valued the fact that Mentallion mapped it properly before changing anything. It is far more manageable now.

Career Guidance Chatbot

Sarah Jenkins, Project Lead

Our team is not technical, but the explanations always made sense. Questions were welcomed and nothing felt rushed.

HOW IT WORKS

One clear process, whether you need a product or automation

You work directly with an engineer, agree the scope and price first, then see the solution through build, testing and handover.

Tell us what you want to build or improve

Bring an app idea, a SaaS concept or a business process that is taking too much time.

Agree the smallest useful scope

We define the first product version or automation workflow, price and delivery plan before work begins.

Build, test and launch

Senior engineers build the agreed solution and test it with you before it goes live.

Handover or keep improving

Take the documented handover or choose optional ongoing support as users and requirements evolve.

Not sure which route fits? Start with a short conversation.

TRANSPARENT UK PRICING

Clear starting points for products and automation

Choose a focused MVP build or an automation package. Scope and pricing are agreed before development starts.

Fast Validation1–2 weeks

Micro-MVP

A simple single-feature app or tool, built fast using modern AI-accelerated frameworks. Perfect for validating whether real people will use and pay for your idea.

from £500 – £1,500one-off fixed project

Single core feature built and tested end-to-end
Clean, responsive Next.js web application
User authentication and database setup

Full MVP

A multi-feature SaaS MVP with user accounts, Stripe subscription billing, and an admin dashboard. Ready for early traction and investor demos.

from £2,000 – £5,000one-off fixed project

Multi-feature SaaS architecture with clean onboarding
User accounts, role-based permissions, and team workspaces
Stripe subscription billing, customer portal, and invoices

Compare full MVP details and inclusions

FREE FIRST CONVERSATION

Free 15-Minute Discovery Call

Tell us about the product you want to launch or the workflow you want to improve. We will recommend the most sensible next step.

POPULAR FIRST STEPDelivered in 3–5 working days

AI Quick-Win Audit

£195one-off

A written audit of your 2–3 highest-impact automation opportunities, plus one small proof of concept or configuration where technically suitable.

✓ Fully credited toward the setup fee of any package below if you proceed within 30 days.

Sole Traders & Small Trades01

Starter

Capture missed enquiries and automate routine customer follow-up.

Setup feeOne-off deployment

£695

Monthly careOptional

Rolling monthly

£149/mo

For: Sole traders, small trades, and local service businesses

INCLUDED IN SETUP:

One core automation built and deployed (e.g. missed-call text-back + lead capture + CRM sync, or automated booking reminders)
Connection to your existing phone, WhatsApp, calendar, or email
Deterministic guardrails and error fallbacks
Team walkthrough and testing before going live
Documented handover of bespoke code and workflows, subject to payment and third-party licences

MONTHLY CARE INCLUSIONS:

Optional

Continuous monitoring and error alerts
Up to 1 hour/month of workflow tweaks and maintenance
Email support (next business day response)
Monthly one-page performance summary report
Rolling month-to-month contract (cancel with 30 days' notice)

Delivery1–2 weeks to live deployment

SupportNext business day email response

Growth

Your AI agent learns your business, not a generic chatbot.

Setup feeOne-off deployment

from £999

Monthly careOptional

Rolling monthly

£249/mo

For: Recruitment agencies, letting/estate agents, clinics, e-commerce, accountants, small professional services firms

INCLUDED IN SETUP:

AI agent (chat, WhatsApp, or voice) trained on your specific business, services, and FAQs
2–3 connected workflows across customer qualification, intake, and booking
Bi-directional CRM and calendar integration
Strict deterministic guardrails to prevent hallucinations and off-brand answers
Human-in-the-loop escalation gate when complex issues arise

MONTHLY CARE INCLUSIONS:

Optional

Up to 4 hours/month of changes, prompt tuning, and workflow additions
Priority support (same UK working day response)
Continuous uptime monitoring and error telemetry
Monthly performance and optimisation review
Rolling month-to-month contract (cancel with 30 days' notice)

Delivery2–3 weeks to live deployment

SupportSame UK working day priority response

Multi-Location & Mid-Market03

Scale

Multi-agent orchestration and deep multi-system integration.

Setup feeScoped after discovery

from £1,995

Monthly careOptional

Rolling monthly

£495/mo

For: Multi-location businesses and established SMEs with more complex operations

INCLUDED IN SETUP:

Multi-agent orchestration across operational departments
Deep integration across multiple existing ERP, CRM, and internal databases
Automated document processing pipelines (invoices, compliance records, PDFs)
Granular role-based access and audit-ready data tracking
Role-based access and data-handling controls scoped around your UK GDPR obligations

MONTHLY CARE INCLUSIONS:

Optional

Up to 10 hours/month of dedicated engineering modifications and improvements
Named senior engineer as your direct point of contact
Quarterly strategy and operational optimisation review
Priority incident response during UK working hours
Rolling month-to-month contract (cancel with 30 days' notice)

Delivery3–5 weeks to live rollout

SupportNamed senior engineer contact (same-day)

Monthly care plans are optional and roll month-to-month with 30 days' notice.

View bespoke builds and full package details

BESPOKE BUILDS & SAAS PLATFORMS

Custom Software & SaaS Builds

For larger builds, such as a full SaaS platform, a legacy system rescue, or bespoke enterprise software, we agree a fixed project fee, typically £6,000–£18,000+ depending on complexity before any work starts. An optional care plan from £699/month is available after launch for ongoing support and iteration.

Project pricing:

£6,000 – £18,000+ fixed fee

Optional ongoing care plan from £699/month

WHY MENTALLION SYSTEMS

Built for ambitious businesses who want practical results, not agency hype

We strip away account managers, confusing buzzwords, and predatory lock-in contracts. You work directly with senior engineers focused on verified ROI.

Clear ownership and handover terms

Bespoke deliverables are handed over after payment, with project documentation and transferable access where providers allow it. Third-party and open-source licences remain subject to their own terms.

Direct senior engineers, no account managers

Direct Communication

Work directly with the software engineers who architect, write, and deploy your code. No middle management telephone games and no outsourced call centres.

No long-term lock-in

Low Risk

Monthly care plans are optional and roll month-to-month. You can cancel a care plan with 30 days' notice.

Fixed price, agreed upfront

No Surprises

Setup costs and monthly care fees are agreed before work starts. Any change in scope is discussed and approved first.

Senior-led delivery

Production Rigor

Work directly with experienced software engineers who build and ship production systems. No junior handoffs or untested trainees.

TRANSPARENT ANSWERS

Frequently Asked Questions

Clear, straightforward answers about our technology, data privacy, cancellation terms, and code ownership.

Is this just a ChatGPT wrapper?

What happens to my data? Is this GDPR compliant?

Do I need any technical knowledge to work with you?

What if it doesn't work for my business?

Can I cancel?

How is this different from Zapier/Make DIY tools?

Can we start with a fixed project and transition to monthly services later?

Do we retain complete IP ownership?

Project availability

What would you rather stop doing manually?

We limit concurrent projects so each engagement receives direct engineering attention. We will confirm current availability on the discovery call.

No pressure and no automated sales sequence after the call.

No obligation 15-min callFixed price agreed upfrontRolling month-to-month

Start a conversation

Tell us what needs to work better.

Share the repetitive bottleneck, the software tools you use, and what a successful outcome looks like. A lead engineer will reply within one business day.

Email: enquiry@mentallionsystems.com

You speak directly with a lead engineer.

Fixed price agreed upfront before any work.

No persistent sales follow-ups.

Direct enquiry