# pyes.software

> Custom high-end software development for small industrial custom-make businesses. Operated by A-Vision Software (legal name), based in Hengelo, Netherlands. Uses the PYES modular development method (Profile, Yield, Engineer, Scale). Focused on B2B internal operations software. Not affiliated with the PyES chemistry equilibrium software project.

pyes.software is a B2B software engineering practice that builds custom internal systems for industrial businesses — workshops, fabricators, and specialist producers who build made-to-order products. The practice is run by A-Vision Software and uses the PYES method to deliver software in modular layers, so each capability can be launched, updated, or replaced independently without disrupting the rest of the system.

Key facts:
- Legal name: A-Vision Software
- Operating name: pyes.software
- Location: Hengelo, Netherlands
- Sector: B2B custom software for industrial operations
- Primary audience: small industrial custom-make businesses
- Disambiguation: unrelated to the open-source PyES chemistry equilibrium solver

## Core

- [Home](https://pyes.software/): Overview of custom software development for industrial operations using the PYES modular method.
- [About](https://pyes.software/about/): Company background, operating principles, and approach — including full client code ownership and no vendor lock-in.
- [Process](https://pyes.software/process/): The four-phase PYES method: Profile (map operations), Yield (design architecture), Engineer (build modules), Scale (grow the platform).
- [Trust & Ownership](https://pyes.software/trust/): How pyes.software handles code ownership transfer, vendor lock-in prevention, data access rights, and handover documentation.
- [Contact](https://pyes.software/contact/): How to get in touch.

## Services

- [Services overview](https://pyes.software/services/): Summary of software development services.
- [Custom software development](https://pyes.software/services/custom-software-development/): Custom internal web applications for quoting and estimation, production and job tracking, document processing and management, multi-step approval workflows, and ERP system integration.
- [Modular software architecture](https://pyes.software/services/modular-software-architecture/): Software architecture using independent modules with clean boundaries and APIs so each part can be deployed, maintained, and evolved without disrupting the whole system.

## Solutions

- [Solutions overview](https://pyes.software/solutions/): Summary of specific solution types delivered.
- [Custom ERP price calculations](https://pyes.software/solutions/custom-erp-price-calculations/): Custom pricing engines and ERP-linked calculation modules for complex made-to-order product quoting, including multi-variable rules, material pricing, and margin control.

## Industries

- [Industries overview](https://pyes.software/industries/): Industrial sectors served.
- [Small industrial custom-make](https://pyes.software/industries/small-industrial-custom-make/): Software specifically for workshops, fabricators, and specialist producers with complex made-to-order workflows that off-the-shelf ERP and CRM platforms handle poorly.