Our custom web development agency designs applications, portals and platforms when existing tools no longer fit your workflow, covering discovery, UX, integrations, testing, deployment and handover.
Journeys, roles, integrations, failure cases and acceptance criteria are agreed before a feature is considered complete. Out-of-scope items remain visible.
The plan separates design, development, acceptance, migration and decisions that depend on your team or third parties. A date is committed only after those dependencies are assessed.
The contract identifies repositories, environments, data, accounts, third-party components, licences and assigned rights. Portability is not reduced to a general sales claim.
Monitoring, backup, restoration, incident procedures, ownership and maintenance are defined according to criticality. A required service level receives its own explicit scope.
PeakLab designs a custom web application when an important workflow, business rule, user experience or integration cannot be covered properly by an existing tool. Discovery must also be able to conclude that a SaaS product, CMS, native configuration or simple automation is enough. Custom development is not an end in itself.
The France Num guide published in March 2026 recommends documenting objectives, users, scope, technical considerations, responsibilities, budget and schedule before comparing providers. We turn these inputs into decisions, acceptance criteria and operational ownership instead of an unprioritized feature list.
The 2025 France Num Barometer surveyed 11,021 businesses. It reports that 78% of respondents see real benefits from digital tools, while 52% are concerned about data being hacked. These self-reported figures prove neither a need to build nor a future result. They explain why usefulness, risk and maintenance should be considered together.
“We compare configuration of an existing tool, integration, no-code and custom development against the workflow, risks and operating cost. If the need is primarily an internal tool, see our [business application agency](/services/agence-application-metier). If it still needs validation, start with an [MVP or POC](/services/agence-mvp-poc).”
We work on business applications, client or partner portals, dashboards, service platforms, API integrations and progressive modernization of existing applications. Each assignment connects a business decision to a verifiable deliverable.
Web development remains the broad discipline of building and integrating a platform. A business application focuses on an internal workflow. A SaaS product is distributed and operated for customers. A systems migration emphasizes continuity and rollback.
We examine the current workflow, users, decisions, data, exceptions and tools already in place. The deliverable separates objectives, available baseline, included and excluded scope, priority journeys, dependencies, risks and acceptance criteria. Your team can prepare these inputs with our requirements document generator. A target number is retained only when its measurement method and owner are defined.
Journeys are designed around roles, context of use, critical tasks and failure cases. A prototype helps verify comprehension, navigation, language, permissions and behavior on agreed devices before complete screens are developed. Feedback is recorded with the resulting decision: revise, retain, defer or remove. Accessibility and the compatibility matrix become acceptance criteria suited to the service, not a blanket statement.
We map data sources, owners, formats, volumes, permissions, retention periods and exchanges with existing software. API contracts, validation rules, errors, rate limits and recovery mechanisms are specified before critical synchronization is built. For the outsourced-product scenario it covers, the France Num guide updated in May 2026 explains that the company collecting the data remains the controller and should assess the contract, subprocessors, locations and safeguards.
The product progresses through demonstrable increments in a dedicated environment. Code review, relevant automated tests, functional checks, permission checks and business acceptance reduce defects without promising their absence. Security criteria can use an agreed reference: OWASP ASVS 5.0 provides identifiable requirements for verifying web application technical controls. Every version ends with a documented decision, not only a demo.
Threats, permissions, secrets, logging, dependencies, backups and restoration are treated according to the data and criticality. The CNIL guidance dated June 19, 2026 states that risks affect businesses of every size and recommends measures including updates, stronger authentication, backups and restoration tests. For services in scope, EU accessibility rules and their exceptions are assessed before development. A migration includes proportionate checks, backup and rollback.
Handover can include the source repository, build and deployment procedure, architecture and data diagrams, API contracts, access inventory, test suites, known decisions and an operations guide. The contract identifies assigned rights as well as licences and third-party services that remain subject to their own terms. A maintenance plan names owners for dependencies, incidents, backups and changes. Its response times and service levels depend on the selected agreement.
Modern and proven stack for high-performance apps
Workflow, users, data, risks, baseline and existing products are assessed. The outcome may be development, a smaller test or adoption of an existing tool.
Journeys, data model, integrations, architecture, non-functional requirements, acceptance and responsibilities form a scope that can be estimated.
Priority capabilities are built, reviewed, tested and presented. Each demonstration is used to decide the next backlog items.
Named users, data, roles, performance, security, backup and rollback are checked against the agreed plan before access is opened.
Documentation, access, monitoring, incident procedure and maintenance are handed over. Observed measures inform the decision about subsequent changes.
Workflow, users, data, risks, baseline and existing products are assessed. The outcome may be development, a smaller test or adoption of an existing tool.
Journeys, data model, integrations, architecture, non-functional requirements, acceptance and responsibilities form a scope that can be estimated.
Priority capabilities are built, reviewed, tested and presented. Each demonstration is used to decide the next backlog items.
Named users, data, roles, performance, security, backup and rollback are checked against the agreed plan before access is opened.
Documentation, access, monitoring, incident procedure and maintenance are handed over. Observed measures inform the decision about subsequent changes.
For ODD Pharma, PeakLab designed a white-label platform that collects data, presents it in a dashboard and generates tailored reports. The published case describes the need, the solution and a testimonial attributed to Victor Ottavi.
This evidence shows our ability to turn a workflow into an application that can be distributed and administered. It sets no standard outcome, schedule or budget for another project. The measurement period and protocol for indicators shown elsewhere in the case are not published, so this page does not turn them into a sales promise.
If the need is primarily an internal workflow, explore our business application service. For a product sold to several customers, see our SaaS agency. To take over a critical existing system, systems migration addresses inventory, continuity and rollback.
Describe the workflow, users, data, existing tools and priority constraint. You leave with the next question to investigate, without an instant quote or promised result before discovery.
Budget, schedule, technology, rights, security, migration and maintenance
In one call, we tell you what's feasible, at what price, and in what timeframe. With full transparency.
Get our tech and business tips delivered straight to your inbox.
© PeakLab 2026
