Agence web / IT & innovation
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WEB APPLICATIONS

A web app that’s fast, reassuring, and production-ready

We build web apps focused on clarity and efficiency: simple journeys, measured performance, security and observability. Goal: reduce friction and speed up decisions.

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Product clarity and UX before code

We turn your needs into simple journeys: goals, roles, priorities, success criteria.

goalsperimeterMVPjourneysfrictionactivationreadabilityconsistencyaccessibility

Performance and production reliability

A fast, stable app built to last: performance, observability, quality and confident releases.

loadingrenderingWeb Vitalslogsmetricsalertingtestsdebtprogressive refactor

Security, compliance and integrations

Controlled access, protected data, and robust integrations with your ecosystem.

authpermissionshardeningGDPRaudit trailERP/CRMpaymentsBI
USE CASES

Custom web applications: choose your use case

UX/UI redesign, performance, customer portal, internal business app, integrations, security… plus a cross-platform PWA option to test faster.

Need to move fast? A PWA lets you ship and update without waiting for App Store / Google Play review: ideal to test, iterate and measure usage before investing in native.

Web app redesign & performance (Core Web Vitals) Customer portal / extranet (SaaS & client area) Internal business app / back office API integrations (ERP/CRM) & automation Application security, GDPR & audit Cross-platform app — PWA

Clarify your web project in 30 minutes

Before building, we secure your priorities, your risks, your budget and your V2 trajectory. You leave with a concrete plan and quick wins.

Faster decisions

We settle what matters: scope, architecture, priorities, risks.

Less friction

UX, performance, technical SEO, journeys: we identify the real blockers.

Actionable plan

Prioritized roadmap, clear steps, realistic trajectory.

Estimer votre projet → No commitment • 30 min • Clear answer
Book a free diagnostic call
Why Antesy?

A steerable web product: UX, performance, reliability

We design for the user and measure business impact: speed, activation, conversion, support.

Redesign that converts

Clearer UX, readable content, measured performance and solid technical SEO.

Effective SaaS & portals

Accounts, permissions, subscriptions, exports: customer spaces that reduce support.

Reliable integrations

ERP/CRM, payments, email, BI: data flows without double entry.

Security & compliance

Controlled access, GDPR, backups, reviews: a serious, durable foundation.

Data-driven steering

Product events & dashboards: decide and prioritize with useful metrics.

FAQ

Custom web development: FAQ

Timelines, method, technologies, performance and support.

What budget for custom web development (website, customer portal, SaaS)?

Budget depends on scope (journeys, roles, screens), integrations (SSO, CRM, ERP, payments, analytics, APIs) and quality requirements (performance, security, monitoring). After a diagnostic, we provide a realistic range and a delivery plan. Keywords: custom web development, web app, customer portal, SaaS, web redesign, web performance, Core Web Vitals, Belgium.

How long does it take to start custom web development (website, portal, SaaS)?

We usually start with a diagnostic (30–45 min) then a short discovery (1–2 weeks): goals, users, risks, architecture, MVP backlog. Then we deliver through iterations (sprints) with clear milestones.

What do you deliver for custom web development (website, portal, SaaS)?

A usable product: UX/journeys, development, targeted tests, deployment, essential documentation, and a maintainable base (code quality + conventions). Optional: monitoring, analytics and runbook.

What should we prepare before starting custom web development (website, portal, SaaS)?

Business goal, target users, constraints (GDPR/security), content (for websites), and systems to connect (SSO, CRM, ERP, payments, analytics, APIs). If you don’t have everything, we structure it during discovery.

Who is custom web development most relevant for?

Typically: SMBs, startups, product teams, B2B organizations. It’s relevant if you have a clear need, recurring users, and a willingness to industrialize (quality, performance, security).

NEXT STEP
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