Development
Custom software development
Custom software is an application designed specifically for your company's processes, data and rules, as opposed to a packaged product you have to adapt your organization to. It covers what generic tools do not do, or do poorly: specific business workflows, calculations unique to your activity, exchanges with equipment or legacy systems.
Agencei builds custom software for manufacturers, service companies, logistics, healthcare, training and finance players whose activity relies on processes that no standard solution models correctly.
We handle needs analysis, architecture, development, data migration and deployment, using proven technologies and documentation that guarantees the software's longevity independently of us.
When do we step in?
No packaged software covers your activity
You have evaluated the market: each solution imposes workarounds, unnecessary modules or expensive customizations. Dedicated software models your business exactly.
Your business rules are a competitive advantage
Complex pricing, scheduling algorithms, specific quality controls: entrusting these rules to a standard tool means aligning them with your competitors'.
Automating a processing chain
File reception, checks, calculations, document generation, dispatch to other systems: dedicated software chains these steps reliably and traceably.
Interfacing equipment or legacy systems
Production machines, PLCs, historical databases or mainframe applications need to communicate with your modern tools.
Making an in-house tool reliable
Software written by an employee who has since left, with no tests or documentation, runs part of your business. We take it over or rebuild it.
How we work
- 1
Needs study and feasibility
Interviews with business teams, mapping of processes and existing systems, identification of business rules, evaluation of market solutions to confirm that custom development is justified.
- 2
Specifications and architecture
Data model, functional breakdown, technology choices, data migration and integration plan, estimate per batch.
- 3
Development in batches
Each batch delivers a verifiable set of features, with automated tests and a demo to key users.
- 4
Data migration and integrations
Migration scripts from existing files and databases, consistency checks, connectors with the ERP, accounting or equipment.
- 5
Acceptance, training and deployment
Acceptance with users, training per profile, gradual production rollout with a parallel-run period if necessary.
- 6
Maintenance and evolution
Fixes, security updates, regulatory adaptations and new features, with a responsiveness commitment defined together.
Technologies we use
- Java
- Spring Boot
- Node.js
- TypeScript
- Python
- React
- PostgreSQL
- Redis
- RabbitMQ
- Docker
- Kubernetes
- AWS
Related expertise
Why choose Agencei?
We first check that custom development is justified
If packaged software covers your need properly, we recommend it. Custom software is an investment that must be justified by genuinely specific processes.
Proven technologies, not experimental ones
Java, Spring Boot, Node.js, PostgreSQL: widely used, documented tools for which you will find skills for many years to come.
Data migration taken seriously
Migrating historical data is often the most delicate part of a project. We address it from the start, with checks and dry runs.
Guaranteed independence
Source code, documentation, tests and deployment procedures belong to you. You can bring the software in-house or change vendors without being locked in.
In brief
- What is this service?
- Design and development service for custom business software, covering needs analysis, architecture, development, data migration, deployment and maintenance.
- Who is it for?
- Companies whose processes, business rules or integrations are not properly covered by packaged software on the market.
- What problem does it solve?
- Having software that models your activity exactly, automates processing, communicates with your systems and remains maintainable over time.
- How long does it usually take?
- Usually from a few months for a focused tool to more than a year for a complete system, with intermediate releases per batch.
- What factors influence the price?
- Number of processes covered, complexity of business rules, volume and quality of data to migrate, integrations with existing systems and the required level of security and availability.
- How does the engagement run?
- Needs study and confirmation that custom development is justified, specifications and architecture, development in batches with demos, data migration, acceptance and training, gradual deployment, maintenance.
- What are the risks?
- Poorly formalized needs, underestimated data migration, dependence on a vendor without documentation, scope growing without arbitration.
- What alternatives exist?
- A configured packaged product, a low-code platform for simple processes, or extending an existing tool with modules and automations.
Frequently asked questions
When should you choose custom software over a packaged product?
When your processes are specific, when market solutions impose costly workarounds or when the software carries a competitive advantage. If a packaged product covers your need properly, adopting it is often faster and cheaper.
How much does custom software cost?
Cost depends on the number of processes covered, the complexity of business rules, integrations and data migration. We estimate per batch after the needs study, so you can decide batch by batch.
How long does a custom software project take?
From a few months for a focused tool to more than a year for a system covering several departments and replacing existing tools. Splitting into batches puts useful features into service well before the project ends.
Can you take over software built by a previous vendor?
Yes. We start with an audit of the code, the database and the infrastructure to decide between takeover, progressive redesign or rebuild, depending on the software's condition and your goals.
How do you guarantee the software's longevity?
Through widespread technologies, automated tests, technical and functional documentation, and a reproducible deployment pipeline. The software does not depend on one person's memory.
Related services
Web application
Business tools, portals and back offices built with React, Next.js, Node.js and Spring Boot.
See this serviceAPI and backend
REST and GraphQL APIs, Node.js, Spring Boot and Python backend services, documented and secured.
See this serviceJava Spring Boot
Robust enterprise applications, microservices and APIs with Java and Spring Boot.
See this serviceApplication redesign
Progressive modernization of ageing applications, with no business interruption or data loss.
See this serviceBusiness automation
Workflows, API integrations, scripts and scheduled jobs, with n8n, Make or custom code.
See this serviceTell us about your project
Describe your need in a few lines: we come back to you with a first analysis and the next steps.