Technology · Langages

JavaScript development

Design, build and scale your JavaScript solutions with an expert team.

We master JavaScript end to end: consulting, custom development, integration, code takeover and maintenance. Fixed-price or staff augmentation, white-label for agencies.

Get a quote JavaScript team

Design, build and scale your JavaScript solutions with a senior team, fixed-price or staff augmentation.

FullDo & JavaScript

We treat JavaScript as a long-term investment: clear architecture, tested and documented code, knowledge transfer. No black box, no hidden debt.

Whether you start a project, take over an existing one or need a team boost, we adapt to your organisation — fixed-price to deliver, or staff augmentation to strengthen your team, white-label for agencies.

Custom JavaScript development. Apps, platforms and sites built around your real needs.
JavaScript integration & API. Connect to your systems, data, tools and partners.
JavaScript takeover & modernization. Audit, legacy takeover, upgrades and SLA-backed maintenance.
JavaScript staff augmentation. Experts embedded in your team, white-label.

Use cases

Where JavaScript makes the difference

Applications métier sur-mesure

Back-offices, portails et outils internes taillés pour vos process.

API & services

Des services robustes et documentés pour connecter votre SI.

Reprise & modernisation

Audit et reprise de bases de code existantes, sans tout réécrire.

Business benefits

What you gain

Code testé, typé et documenté, pensé pour durer
Performances et sécurité au niveau des standards 2026
Équipe senior, revue de code systématique
Transfert de compétences et documentation livrée

Project types

The JavaScript projects we deliver

SaaS & dashboards

Corporate websites

E-commerce

Business apps

API & integrations

Legacy takeover

Our method

From idea to production, and beyond

Scoping & consulting

We clarify your need, constraints and goals before writing a line of code.

Architecture & design

Stack choice, technical architecture, UX/UI and approved mockups.

Development

Short sprints, tested and reviewed code, regular demos and check-ins.

Testing & QA

Automated tests, UAT, performance, accessibility and security.

Go-live

Controlled CI/CD deployment, no downtime, no stress.

Maintenance & growth

Support and evolutions with a measured service-level commitment.

Why FullDo

Our JavaScript expertise

Nous traitons JavaScript comme un actif de long terme : architecture claire, tests automatisés et maintenabilité d'abord.

120+

Projects delivered

40+

Experts available

98%

Client retention

48h

Response time

FAQ

Can you take over an existing JavaScript project?

Yes: audit, security, tests, then ongoing evolutions without a full rewrite.

Do you work fixed-price or staff augmentation?

Both: we deliver end to end, or embed experts in your team, white-label for agencies.

Do you work remotely?

Yes, remotely or on-site, in France and worldwide.

Langages

Other technologies

TypeScript Python PHP

Let's talk

A JavaScript project? Get your quote

Describe your need in a few lines: we reply within 48h with a first proposal and estimate.