--- title: "Case studies: custom internal software with AI | C-Esium" description: "C-Esium case studies: Tech-O, a multi-branch water-leak detection network in France, runs its whole business in complete custom software (3,000+ h/year saved)." url: https://c-esium.com/en/case-studies/ --- Case studies # Case studies: the internal software built by C-Esium C-Esium publishes one reference case study: **Tech-O**, a multi-branch water-leak detection network in France, which runs sales, scheduling, technicians, head office and accounting in **complete business software** with built-in AI — CRM, quotes, invoicing and reminders, payroll inputs, SMS and email, a calendar synchronised with Google Calendar, PDF documents — and more than **3,000 hours saved per year** according to an estimate made with Tech-O. It is the case study we publish in detail, because the project went very far technically: AI, MCP connector, integrations. By [Noé Fantino](https://c-esium.com/en/about/), founder at C-Esium · Updated 6 October 2026 ## Published case study: Tech-O One tool, from the customer request to payment, for a network of branches and its field teams. Services · Non-destructive water-leak detection · France ### [Tech-O: the complete business software of a multi-branch water-leak detection network](https://c-esium.com/en/case-studies/tech-o/) Tech-O is a network of non-destructive water-leak detection companies, rooted in rope-access work and organised as a franchise network, with branches in Saint-Étienne, Ambérieu-en-Bugey, Annecy, Limoges, Bourg-en-Bresse and the Lyon area (France). It is a services company. C-Esium built its complete business software, used every day by sales, scheduling, technicians, head office and accounting. Tech-O owns its software: its contract assigns to it all rights to the code. The modules of Tech-O’s software: - Customer (CRM) and request management - Quotes and invoicing, with automatic reminders for unpaid invoices - Accounting synchronised both ways with Pennylane - Invoice triggered automatically by the job report - Payroll inputs: hours and data passed on for payroll - Customer communication by built-in SMS and email - Team calendar synchronised both ways with Google Calendar - Custom documents and PDF reports generated automatically - Job reports written by AI from voice notes - Data you can query from Claude or ChatGPT (read-only MCP connector) 3,000+ h saved per year 30% operational gains −20% human errors Estimate made by C-Esium with Tech-O. [Read the full case study](https://c-esium.com/en/case-studies/tech-o/) ![Example of an internal software dashboard on a tablet: team status, alerts and the team of the day](/media/dashboard-ipad.webp) Illustration with fictitious data — this is not Tech-O’s screen. ## Why Tech-O, and our other projects A project is only presented in detail with the client’s written agreement. Tech-O is the case study we publish in detail, because the project went very far technically; our other business software and app projects are not presented in detail. ### Why Tech-O? It is the most complete project we can show in detail: business software that covers the whole business, AI on voice notes and an MCP connector in production. It shows what C-Esium delivers technically. ### Other software and apps The C-Esium team has designed other business software and mobile apps. They are not presented in detail on this site. ### Industry, and health and social care No published case study to date. The approach — assessment workshop, scoping, build in sprints — applies in the same way; in health and social care, the hosting arrangement for health data is defined at scoping, in line with the applicable health-data rules. ## The companies C-Esium is relevant for It is not the sector that makes a good internal software project, it is the company’s situation. C-Esium works with SMEs and mid-sized companies in every sector — services, industry, construction, health and social care — from about ten to a few hundred employees, whose processes do not fit standard software. A focused project starts from AED 40,000; a complete internal software from AED 200,000 (excluding VAT). ### Several sites, the field and a head office Branches, sites or field teams that must share the same information as head office and management, in real time. ### A case that changes hands From the customer request to payment, every case goes through several departments. Each handover is a risk of re-keying, waiting or forgetting. ### Non-standard business rules Ways of pricing, scheduling, checking or invoicing that no off-the-shelf software applies without workarounds. ### A size, not a sector From about ten to a few hundred employees, able to invest from AED 200,000 in a tool they own — or from AED 40,000 for a focused project. ### An internal project lead A project manager or an operations manager who carries the project with us. It is the non-negotiable condition for the tool to be adopted. ### AI on real data The wish for AI to work on their business — reports, follow-up, reporting — and not only on emails or summaries. The starting point, in every case A half-day assessment workshop, on site or by video: we follow the real journey of a case, from the incoming call to the invoice, and find where the margin is lost (re-keying, waiting, errors, reminders). [The 2030-ready assessment](https://c-esium.com/en/software-ai-assessment/) When we are not the right option - Your processes are standard and off-the-shelf software already covers them. - Your budget is below our starting prices: AED 40,000 for a focused project, AED 200,000 for a complete internal software. - Nobody in-house can carry the project with us. [Custom, ERP or SaaS: the decision grid](https://c-esium.com/en/custom-business-software/) ## Frequently asked questions ### What case studies can C-Esium show? The reference case study published by C-Esium is Tech-O, a multi-branch water-leak detection network in France: complete business software — CRM, quotes and invoicing with automatic reminders for unpaid invoices, accounting synchronised with Pennylane, payroll inputs, built-in SMS and email, a calendar synchronised with Google Calendar, PDF documents, reports written by AI — for sales, scheduling, technicians, head office and accounting, with more than 3,000 hours saved per year according to an estimate made with Tech-O. Tech-O owns its software: its contract assigns to it all rights to the code. Tech-O is the case study we publish in detail, because the project went very far technically; our other business software and app projects are not presented in detail. ### Do you work in my sector? C-Esium does not specialise in one sector: the method starts from your real processes, observed in the field. Tech-O, a multi-branch water-leak detection network in France, is the case study we publish in detail, because the project went very far technically (AI, MCP connector, integrations). Our other business software and app projects are not presented in detail on this site. The approach applies to services, construction, industry, and health and social care. ## Does your organisation look like Tech-O’s? 30 minutes to understand how your cases move, your tools and what internal software with AI would change for you. Free, with no commitment. [Book a call](https://c-esium.com/en/contact/)[contact@c-esium.com](mailto:contact@c-esium.com)