JE4NDEV / Remote studio · English & Portuguese

From your idea to a real product.

We turn your domain expertise into digital products. Custom websites, software and AI assistants for individuals and businesses, from the first scope to launch. Remote collaboration in English and Portuguese.

Discuss your projectExplore the products

FROM INTENT TO EXPERIENCE

Built around you.Engineered to work.

A website that presents your work. A system that makes your day easier. An assistant that understands your context.

Let's build your idea

IDEAS WE HAVE BROUGHT TO LIFE

Now, imagine yours.

Explore the products and their stories

Design, engineering and AI. Built around you.

Scroll to discover

Selected projects

Products you can explore.

Four real projects, from interface to operations. Explore what we have built and imagine what we could create for you.

Public snapshot / Product overview · PT snapshot

Email integrated with applications and agents.

01 / 04Email Infrastructure

MepMail

Transactional email for digital products. A Resend-SDK-compatible API, SMTP and MCP agent integration, powered by Amazon SES.

Problem / Delivery
Problem
Products need to send transactional email and monitor operations without maintaining disconnected integrations for each application or agent.
Delivery
API, SMTP and agent tooling with public documentation, a sending queue and operational events on Amazon SES.
API + SMTP
Application integration
MCP
Agent integration
Amazon SES
Sending infrastructure
AGPL
Attributed open-source foundation
Let's build something like this
View case studyVisit live demoGitHub
TypeScriptPostgreSQLAmazon SESMCP
Product composition / From project to render

Give your architectural ideas a visual form.

02 / 04AI Platform

ArchScene

Batch-render workflow for architecture studios

Problem / Delivery
Problem
Architecture teams need multiple client-ready visual options while keeping each result tied to the original scene, design intent, project and review history.
Delivery
I built the product workflow from scene intake to asynchronous render batches, before-and-after review, private project galleries, visible credit accounting, billing and a public product changelog.
Beta
Public workflow live
5
Free credits, no card
Batch
Scenes per project
Public
Dated product changelog
Let's build something like this
View case studyVisit live demo
Next.js 16React 19SupabaseStripeGrok ImagineSketchUp Ruby
Product composition / Operations · demonstration data

A more organized marketplace operation.

03 / 04SaaS Platform

FullCommerce360

Operating system for Mercado Livre sellers

Problem / Delivery
Problem
Product research, margin assumptions, listing preparation and daily seller operations were fragmented across tools, with a high risk of mixing client/account context or publishing incomplete information.
Delivery
I designed and built an account-scoped workflow from evidence and margin research to listing review, explicit approval gates and connected orders, stock, labels, messages, reputation and financial context.
ML API
Official integration
Scoped
Client and seller accounts
Gate
Human approval before publishing
Demo
Sanitized public proof
Let's build something like this
View case studyVisit live demo
Next.jsTypeScriptSupabaseMercado Livre API
Public snapshot / Links, QR Codes and Pages · PT snapshot

Change the destination. Keep the link and QR code.

04 / 04SaaS Platform

URLPivot

Change where a shared link or QR sends people—without replacing it.

Also available to agents via MCP, with workspace-scoped permissions.

Problem / Delivery
Problem
A campaign changes after its link has been shared or its QR code printed. Replacing the public URL means updating every place it appeared.
Delivery
Managed links keep a stable public address while their destination can change. Reuse the QR code, group managed links on a campaign Page and review access and click signals.
Stable
Public link, editable destination
Reusable
QR code
Pages
Campaign destinations
Signals
Views and clicks
Let's build something like this
View case studyExplore URLPivotView official Page
Next.jsTypeScriptPostgreSQLStripe

Partners

Brands growing with JE4NDEV

Real products and businesses built and operated in partnership with JE4NDEV — from design to infrastructure.

Every brand above has a navigable public site. No invented numbers, no fake storefront.

Ways to work together

Start with what you need

A website that makes your offer clear

A professional website or landing page that helps the right people understand what you do and how to get in touch.

Tell me what you need
Professional websitesLanding pages

A system that makes work easier

A tool for your work, a product based on your expertise or a system for your team. We define the first scope and connect the tools you already use.

Tell me what you need
Custom systemsAutomation and integrations

An AI assistant made for you

A personalized assistant to organize tasks, support study and research or automate steps in your work. We configure its context, tools and permissions around your routine.

Tell me what you need

Like Nora? We can build an assistant for your everyday life or business.

Personalized AI assistantsSee how we built Nora

How we ship

A clear path from first conversation to handoff.

We agree on the goal and the next deliverable before work begins. Scope, timing and investment are discussed together, based on what the project needs.

01

Tell me what you need

We talk through your routine, project or business and what you want to make easier or possible.

A SHARED UNDERSTANDING

02

Agree on a first step

I suggest a practical scope with clear priorities, responsibilities, timing and investment before work starts.

SCOPE AND PLAN

03

Review the work together

You can see progress, try what is being built and share feedback at agreed checkpoints.

PROGRESS AND FEEDBACK

04

Wrap up with clarity

We review the agreed work, hand over what is included and discuss any useful next step.

HANDOFF

JE4NDEVWebsites, systems and AI assistants
Next.js
TypeScript
Supabase
Node.js
OpenAI
React
10+ years

Who we are

JE4NDEV

JE4NDEV is a digital product agency for individuals and businesses. We build websites, custom systems, automation and personalized AI assistants — from everyday personal needs to SaaS products and business operations. For over 10 years we have turned real problems into software, from scoping the idea to a verifiable first milestone, evolving with real feedback.

View projects on GitHub

Start a conversation

Have a project in mind?

It could be a website to showcase your work, a system for your team or a personalized AI assistant for your everyday life. Tell us what you need, as an individual or a business. The first conversation is simply to understand the context and agree on a next step, with no obligation.

Talk to JE4NDEV

Working with individuals and businesses.

jean@je4ndev.comMessage us on WhatsAppRequest a discovery call

Remote collaboration in English and Portuguese. Call times are agreed by email around your time zone and availability.