WA-Design From silicon to cloud

From silicon to cloud

A sensor that reports an accurate reading, firmware that lasts twenty years, a platform that passes the audit. We work across the whole chain, not on a single layer.

Talk about your project Expertise

  1. Silicon Electronics & embedded systems
  2. Device Medical devices & compliance
  3. Application Mobile & web applications
  4. Platform Software, digital services & cloud
  5. Data Applied AI & automation
  6. Whole stack Technical leadership & audit

What we work on

From component to dashboard, by way of the app. These domains overlap — and that overlap is exactly where the problems we are brought in for tend to live.

Silicon

Electronics & embedded systems

STM32 firmware on FreeRTOS, analogue acquisition chains, bootloaders and field updates, ModBus, BLE and NFC.

We design the part of the product where a mistake cannot be fixed by a deployment: the firmware that ships with the board. Microcontroller choice, memory and power budgets, measurement-chain reliability, field-update strategy.

We also take over existing work: firmware that crashes in production, a measurement that drifts, a protocol that buckles under load.

  • STM32
  • FreeRTOS
  • C/C++
  • ADC
  • ModBus
  • BLE
  • NFC
  • Bootloader

Device

Medical devices & compliance

IEC 62304 software lifecycle, ISO 14971 risk management, ISO 13485 quality system and MDR 2017/745 technical documentation.

Compliance is not bolted on at the end of a project; it is built alongside it. We structure the software lifecycle, classification, risk analysis and requirement → design → test traceability so that the file reflects the real product rather than an after-the-fact reconstruction.

We work with development teams, not beside them: the goal is a file you can defend in front of a notified body without turning engineering into document production.

  • IEC 62304
  • ISO 13485
  • ISO 14971
  • IEC 60601-1
  • MDR 2017/745

Application

Mobile & web applications

Native or Flutter iOS and Android apps, Angular and React web interfaces, BLE and NFC pairing with connected devices.

The app is often the only place where users actually meet the product. For a connected device it also carries pairing, offline sync and recovery when the link drops — problems that get solved between the firmware and the screen, not inside either one.

We design and build these apps, from user journey to store release: native Swift or Java when the hardware demands it, Flutter when a shared codebase is enough, Angular or React for web interfaces and back-offices — including when the app is itself a medical device.

  • iOS
  • Android
  • Swift
  • Java
  • Flutter
  • Angular
  • React
  • UI/UX

Platform

Software, digital services & cloud

Custom software and digital services: back-ends, APIs, integrations, cloud architecture, centralised authentication and containerised infrastructure.

We build the software a service runs on: Java/Spring, Node.js, Python or PHP back-ends, documented APIs, integrations with the tools already in place, customer portals and back-offices. From a small business’s digital service to the platform behind a fleet of connected devices.

Once hardware is involved, a platform is no longer an app with sensors in front of it: it is an end-to-end chain in which every link has its own failure modes. We design that chain, weigh public cloud against self-hosting, and put authentication, monitoring and backup in place before the volume arrives.

  • Java/Spring
  • Node.js
  • Python
  • PHP
  • API
  • Docker
  • Traefik
  • Keycloak
  • Big Data
  • Self-hosting

Data

Applied AI & automation

Language models wired into real business processes: MCP servers, tool-using agents, n8n orchestration, local inference.

The value of a language model in a business rarely lies in the model and almost always in the wiring: what data it sees, which tools it may call, what happens when it gets things wrong, and where its autonomy ends.

We build that wiring — authenticated MCP servers, n8n workflows, specialised agents — under a constant constraint on the confidentiality of the data involved.

  • LLM
  • MCP
  • Agents
  • n8n
  • Ollama
  • Automation

Whole stack

Technical leadership & audit

Fractional CTO, architecture audits, stack decisions and team support, across the full height of the system.

Some decisions cannot be made from a single layer: whether a function belongs in firmware or on the server, what gets certified and what does not, what the in-house team must own and what it can hand off.

This is the role we hold most often — part-time, over the long run, or as a bounded audit when the first need is simply to see clearly.

  • Technical leadership
  • Audit
  • Architecture
  • Code review
  • Mentoring

Work

Products in service, references across the whole technical chain, and published code.

Products

MonAffaire

Design, architecture and development — a WA-Design product

SaaS platform for running a professional business: quotes, invoices, purchase orders and e-signature, with AI agents built into the workflow.

MonAffaire exposes its own authenticated MCP server, so quotes and invoices can be driven from an assistant or an n8n chain rather than from the UI alone. Built-in agents handle voice notes, document analysis and images.

monaffaire.fr

References

Assignments and roles led by the founder.

IoT scale-up · international logistics

An IoT platform that holds the load

Redesign of the cloud architecture of a connected-asset tracking platform around analytics, data quality and monitoring, followed by a migration to AWS.

events processed per day
2M
availability (SLA)
99.74%
infrastructure costs
−20%

Event-driven architecture (Kafka, Kubernetes), a database migration delivered with a tier-one integrator — on schedule, with zero data loss — SSO rollout and a CRM integration overhaul with international partners. Technical teams were trained on the new cloud foundation.

Deeptech start-up · from prototype to market

Building an R&D department from scratch

Setting up the R&D department of a young industrial company, from its first commercial release to a V2 architecture built to scale.

engineers hired and led
0 → 30
first market launch
V1

Hiring and structuring the software, firmware, QA and business-analysis teams; introducing Scrum and user acceptance testing; a tooled delivery chain (Jira, Confluence, Git, Jenkins). An event-driven V2 architecture on NoSQL (Cassandra), designed for the volume to come rather than for the demo.

Industry · connected rail freight

Embedded firmware, all the way to certification

Firmware design for IoT beacons mounted on rolling stock, with a mesh network between beacons, and support through the certification required by the rail operator.

EN 50128
SIL0
implementation
ISO 9001

Data acquisition (STM32, FreeRTOS, ADC), ModBus/RS485, BLE and NFC communication, Flash memory management and bootloader, a proprietary mesh network. In the field: an Android driver to talk to the beacons and a routing and distance-calculation service for freight.

Biotech · medical devices

Compliance built alongside the product

Setting up the quality system and running regulatory compliance for a connected medical device, in parallel with development rather than after it.

medical-device standards covered
5
health interoperability
HL7 / FHIR

ISO 13485 QMS, IEC 62304 software lifecycle, IEC 60601-1 electrical safety, ISO 14971 risk management and the EU MDR 2017/745 technical file. HL7 / FHIR exchange standards integrated so the device can talk to health information systems.

Biotech · medical devices

Cloud platform, NFC app and everyday AI

Designing a medtech company’s digital platform on Azure and its first NFC mobile app, and wiring language models into internal processes.

first NFC app
iOS + Android
delivery cycles
2 wks

Modular architecture on Microsoft Azure, governance and an Azure DevOps delivery chain in two-week sprints. Containerised infrastructure (PostgreSQL, MySQL, n8n, AFFiNE knowledge base) and automated workflows in which LLMs — Claude, Copilot, Gemini or local Ollama — handle real business tasks.

B2B software vendor · transport and logistics

From GPS tracker to real-time fleet tracking

A complete geolocation and fleet-management solution, from the embedded hardware prototype to the real-time tracking application.

Tracker prototype (ATmega, GPS, GPRS/GSM, SD storage, temperature and fuel sensors) and its platform: real-time tracking, geofencing, predictive maintenance and mapping. In the same period: a multi-tenant EDI platform, document management and logistics solutions on handheld terminals.

Open source

Tools published under open licences.

  • neural-hub-automation-starter-kit

    A self-hosted automation and AI stack in minutes — n8n, Open WebUI and AFFiNE behind Traefik.

    Docker · n8n · Open WebUI · PostgreSQL/pgvector · Traefik

  • cassandra-extractor

    Extracts Cassandra data to Kafka, S3 or PostgreSQL, with parallel workers and memory guards.

    Python · Cassandra · Kafka · AWS S3 · Redis

  • yed-datamodel-designer

    Design a database model in the yEd graph editor, then generate PostgreSQL DDL and CSV data dictionaries.

    Groovy · yEd · GraphML · PostgreSQL

  • BookingPress add-ons

    Four WordPress add-ons for BookingPress: custom SMS gateway, holidays card, staff reviews slider, per-staff calendar colours.

    PHP · WordPress

All repositories on GitHub →

The practice

WA-Design brings twenty years of practice across a complete technical chain: from debugging STM32 firmware to architecting a cloud platform, by way of the software design file a notified body will accept.

That continuity is rare, and it is why we exist. Most projects that go wrong do not go wrong inside a layer but at the boundary between two: between sensor and protocol, between the software team and the quality system, between the prototype and what ships.

We work as fractional CTO, on architecture assignments or as team reinforcement, depending on what the project needs.

A project, a blocker, an audit?

Describe the situation in a few lines. We reply within two working days, and we tell you when it is not a fit.

Email
contact@wa-design.com
Code
github.com/awaxis
Based in
France

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