Infrastructure & engineering

Software
written for you,
line by line.

Business applications, internal tools and automation, developed by our engineers with security at the core of the code. The code is yours, documented and auditable.

No commitment · Everything under NDA from the first message

Sound familiar?

When no software
fits your business.

Off-the-shelf products impose their logic. Sometimes you need a tool that follows yours.

You’re juggling spreadsheets

Critical processes depend on shared files, copy-paste and goodwill.

Off-the-shelf software doesn’t fit

You pay for features you don’t use, and the ones you need are missing.

Repetitive tasks tie up your teams

Data entry, exports, reconciliations: time lost every week.

Your current tool is a black box

Nobody knows how it works, or whether it’s secure.

What we do

Design, develop,
deliver.

Software built for your use, secure by design.

01
Business applications

Your process, your tool

Web or internal applications designed around the way you work.

Analysis of your processes
Interface tailored to users
Ongoing evolution
02
Automation

Fewer manual tasks

Scripts and tools that connect your systems and remove repetitive tasks.

Data exchange between systems
Automated processing
Generated reports
03
Security in the code

Secure by design

Development following security best practice: authentication, access control, data protection.

Authentication and permissions
Protected data
Code review
04
Delivered & documented

You stay the owner

Source code handed over, technical and user documentation, open to independent audit.

Source code handed over
Full documentation
Auditable by a third party
Our method

From the need
to the tool in production.

01

Analysis

We understand your process, your users and your constraints.

02

Design

Clear specifications, mock-ups and a detailed quote.

03

Development

Incremental deliveries you test along the way.

04

Go-live

Secure deployment, training and documentation.

What you get

What you get.
A tool that belongs to you.

The source code

Handed over and documented. You’re not locked in to a provider.

Built-in security

The software is designed to withstand common attacks.

A tool people use

Designed with your users, not against them.

Why Security255

Systems engineers
who think like attackers.

Over 23 years on Linux

Systems engineering is where we come from. We don’t discover your systems — we know them from the inside.

Open source and sovereignty

Open, auditable and long-lasting technologies. Your infrastructure doesn’t depend on a vendor’s commercial policy.

Security first

We are a cybersecurity firm. Segmentation, encryption and access control are part of the project, not an option.

Hardware supply: we specify, supply and integrate the hardware required as part of the project.

Go further

Related services and resources.

Open-source migration

Replace proprietary software with solutions you control.

View the service

Audit & pentest

Test the security of an existing application.

View the service

Is your website trustworthy?

Our article on the visible security of your online services.

Read the article

Ready to
work together?

If someone recommended you speak with us, that recommendation already carries more weight than any sales argument. Tell us who you are and what you protect.

NDA GDPR LPD
Available right now Direct response within 24 business hours
First conversation, no cost
30 minutes to see if we're a fit. No commitment on either side.
Total confidentiality
Everything you share is covered by NDA from the first message.
Direct access to the team
A member of the technical team responds. No intermediaries.

Request access

Tell us about your company. We handle the rest.

✦ Request received. A senior professional will contact you within 24 hours.

Information handled under NDA · GDPR · LPD/nLPD — absolute confidentiality.

Relevant information

Protect your business from

digital risks.

Resources

Access resources and content relevant to your business.

Open Resources

Actions after an attack

Critical steps to regain control after a cyberattack

Read article

Local presence

Cybersecurity services for businesses in Annecy.

Learn more