Custom software development in Bastia, Corsica
We provide custom software development for SMEs, startups and public bodies: business software, subscription-based online platforms, connections between your tools and extensions, all designed around the way you work. Because we also publish our own software, we know a project does not end at delivery: we host, maintain and improve what we build.
What we do
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Custom business software
A tool built around your procedures: case tracking, scheduling, quotes, stock or field jobs. It replaces scattered spreadsheets and double entry, and adapts to you rather than the other way round.
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SaaS platforms
SaaS, or software as a service, is software your customers use online on a subscription, with nothing to install. We take it from a first version tested with real users to a platform run day to day.
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APIs and integrations
An API is a gateway that lets two pieces of software exchange data automatically. We connect your management system, customer database, accounts or online shop so that each piece of information is entered only once.
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Plugins, extensions and digital resources
Modules that add a feature to software you already use, plus ready-made templates and resources, for your own teams or for sale.
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Maintenance and improvements
Hosting, security updates, fixes and new features: your software stays reliable and keeps pace with your business.
Our solutions in detail
Custom business software
Why a business tool built around your procedures saves time, how it is built and what drives its cost.
LEARN MORESaaS development
Turning an idea into subscription software: start with an MVP, protect each customer's data and choose the right billing model.
LEARN MOREAPIs and integrations
Connecting your software through APIs: ERP, CRM, shop and accounts kept in sync, with secure, monitored data exchanges.
LEARN MOREPlugins and extensions
Add the feature your tools are missing, or sell extensions, templates and digital resources: uses, method and what to check.
LEARN MORE
A software publisher in Bastia, from first idea to everyday operation
KALLISTACK is a company based in Bastia, founded by Alexandre Sciacca, a full-stack engineer with more than ten years of experience. Our work covers the whole life of a piece of software: design, research and development, prototyping, development, integration with your tools, maintenance, then distribution and commercial operation. We build software for our clients, and we also publish our own.
Wearing both hats matters to you. A publisher knows that software does not stop on launch day: it has to be hosted, monitored, fixed, documented and improved for years. We plan every project with that in mind, with code that is readable, tested and easy to hand over.
We work with SMEs, startups and public bodies, on the island and further afield. Every enquiry gets a reply within 48 hours, and every quote is written clearly, without jargon.
Business software, SaaS, API or extension: which suits your project?
Technical labels matter little at the start. What counts is the problem you need to solve. Here is how we usually steer a project.
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You want to run your business more smoothly
Cases, schedules, stock or field jobs handled through spreadsheets and emails: custom business software brings everything into one place, with the right access for each person.
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You want to sell a service online
Your expertise can become software that other businesses pay for by subscription. That is the SaaS model, which usually starts with a first version limited to the essentials.
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Your software does not talk to each other
Online shop, accounts, customer database and management system each work in isolation: API integrations move the data between them automatically.
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A tool you like is missing one feature
Rather than switching software, a plugin or extension adds exactly what you need, without upsetting your team's habits.
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No development is needed
Sometimes a well-chosen, well-configured existing product is enough. We will say so, and we can help you pick it.
How a custom software development project unfolds
Whatever the size of the project, the approach is the same and every stage ends with your sign-off. We favour a first version focused on the essentials, put in your users' hands early, then enriched from their feedback.
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Understand
We start from your goals, your organisation, your current tools, your budget and your timeline.
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Design
We propose a reasoned solution and mock-ups of the screens, approved with you before any development begins.
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Build
We develop and test in stages. You follow progress and try the software on a test version.
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Launch and support
Go-live, hosting, maintenance and improvements: we stay by your side once the software is in production.
Our own products: La Forge, Feature Workflow and Hameau Vivant
We hold our own products to the standards we apply to yours. La Forge is a software factory driven by autonomous agents: it turns a stated requirement into tested, reviewed code, orchestrating several tasks in parallel. Feature Workflow is a plugin that gives an AI coding agent a structured, step-by-step development workflow, from defining a feature through to testing and documentation.
Hameau Vivant is a persistent online simulation built with TypeScript, Node.js, SQLite and Three.js: the world carries on between visits and events are broadcast in real time. These projects call on the same skills as business software: data stored reliably, a service that runs continuously, automated checks and code that stays maintainable as it grows.
Sale, licence, subscription or pay-per-use: choosing the right model
If you are building software to sell, how you charge for it should be decided early, because it shapes the design. A sale grants the right to use it in one go. A licence is permission to use the software under set terms: number of users, duration, updates included. A subscription gives access for as long as it is paid, and pay-per-use bills according to actual consumption.
Each model has technical consequences: user accounts and permissions, activation, invoicing, usage tracking. We help you choose the one that fits your audience, then build it into the software alongside the right payment providers.
Who this service is for
SMEs, startups, local authorities and public bodies, in Corsica and beyond. No technical background needed: you explain your business and what wastes your time, we suggest the right solution with a clear, jargon-free quote, and you keep a single point of contact from the first meeting to maintenance.
How we work
- T-3
Understand
We listen to your goals, budget and timeline. A clear quote, no jargon.
- T-2
Design
We map out the solution and the mock-ups, which you approve before any development starts.
- T-1
Build
We develop and test. You follow progress at every step.
- T-0
Launch & support
Go-live, then hosting, maintenance and improvements over time.
Technologies and methods
- TypeScript
- Node.js
- React / Next.js
- REST APIs
- Docker
- Real time (SSE)
- Automated testing
Frequently asked questions
Why custom software rather than an off-the-shelf product?
Off-the-shelf software works well when it genuinely covers your needs. Custom software makes sense when you are bending your organisation to fit the tool, piling up subscriptions and re-keying data, or when the way you work is what sets you apart. We will tell you plainly when an existing product is enough.
How much does custom software cost?
It depends on the number of features and users, the connections with your other tools, the data to migrate and the level of support you want. After a first conversation you receive a detailed, jargon-free quote, before any commitment.
Who owns the code and the data?
This needs settling before work starts, and we settle it in the quote: who holds the source code, how it is handed over, where your data is hosted and how you can export it in a standard format. You know from day one what belongs to you.
Can you take over existing software?
Yes, after a review of the code, the hosting and the documentation. We tell you what can be kept, what needs fixing first, and whether it is wiser to improve what exists or rebuild it.
Do you only work with local businesses?
Not at all. We are glad to support businesses and public bodies across the island, but we also work with clients elsewhere in France and abroad. Software lends itself well to remote collaboration: video meetings, test versions available online and shared progress tracking.
Do I need a detailed specification to get started?
No. A first conversation is enough: you describe your goals, budget and timeline, and we put the requirements into shape together during the design stage. If you already have a specification, we start from it.
Do you build mobile apps as well?
Yes, designing web and mobile applications is part of what we do. Depending on the use, a web app that installs on a phone may be all you need; we will advise on the format that best suits your users.