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Services by Arielton Oberek, freelance developer in Brazil

Faster sites, more sign-ups and less repetitive work

I take on a few projects at a time for businesses in Brazil and abroad, and each one starts from a problem that costs you visitors, sales or hours and ends with the fix live and measured.

Get a proposal by email

Priced per project: send a short brief and get a written proposal with the price before any work starts.

Problems I solve

  • Website speed optimization

    Priced per project

    Your site takes seconds to appear on a phone, and visitors leave before it does.

    A site that shows up fast on mobile, with before and after numbers you can check.

  • Landing page that converts

    Priced per project

    Campaign traffic lands on a page that’s slow, vague or asks for five things at once.

    One page, one offer, one action, built to load fast and count every sign-up.

  • AI automation

    Priced per project

    Your team spends hours every week on the same replies, copy-paste and document reading.

    An AI assistant drafts that work in your tools, and a person approves what goes out.

  • MVP development

    Priced per project

    The business runs on spreadsheets and group chats, or the idea never left the slide deck.

    A first version of the app that real people use and pay for, on your own accounts.

  • Custom calculators for your site

    Priced per project

    Your customers search for a number before they buy, and find it on someone else’s site.

    A calculator on your site that answers it, ranks in search and ends with a lead.

Why hire a person when AI writes code

AI tools can draft a page or explain an error. They won’t agree on a scope with you, notice when the brief is wrong, take responsibility when something breaks, or put their name on the result.

I use AI every day where it saves time, and I build AI systems for clients. Every change that ships is still reviewed, tested and explained by me, and you deal with one person from the first email to the handover.

The site you’re reading is the portfolio: more than 300 free tools, everything in English and Portuguese, and a homepage that scores 96 to 100 on mobile Lighthouse. You can check the work before you write.

How it works

  1. Step 1:

    Short

    Brief

    You email the problem, using the template on this page. I reply with questions or a first read on what’s possible.

  2. Step 2:

    Short

    Proposal

    A written scope: what you get, what’s left out, how we’ll talk and the price. Nothing starts until you approve it.

  3. Step 3:

    Most of the project

    Work

    Progress you can see: preview links, short written updates and a call when one helps.

  4. Step 4:

    Short

    Handover

    Everything in your name, a walkthrough of what was done and why, and the support period agreed in the proposal.

Working together

Working together
Based inBrazil (UTC-3)
ClientsBrazil, and remote worldwide
LanguagesPortuguese and English
Contactcontact@arielton.com

Proof you can check

  • Maqnar (maqnar.io)External site

    A platform that keeps agricultural fleets tracked and maintained. I’ve worked on it since 2024.

  • Ludh (ludh.com.br)External site

    Landing page and AI assistant orchestration: the AI drafts replies to patients and the doctor approves each one.

  • editkit-tsExternal site

    Open-source library I wrote for applying code edits that AI models generate.

  • COSMQExternal site

    Open-source mobile app for working with PostgreSQL and MySQL databases from a phone.

  • Free tools on this siteOn this site

    More than 300 calculators, converters and generators in English and Portuguese, which bring search traffic to this site.

Frequently asked questions

How much does a project cost?
Each project is priced from a written proposal, because the scope decides the price. Send a short brief with the problem and, if you have one, a budget range, and you get a price for that scope before any work starts.
Which service do I need?
Start from the problem: slow site, a launch without a page, repetitive work, a process stuck in spreadsheets, or customers doing math on other sites. If you’re not sure, describe it in an email and I’ll tell you which one fits, or that none does.
Do you work with clients outside Brazil?
Yes. I work remotely with clients anywhere, in English or Portuguese. I’m on UTC-3, which overlaps most of the working day with the Americas and the afternoon in Europe.
Can you work on my existing site or system?
Yes, and most speed and AI projects happen that way. I start by looking at what exists and measuring it, then change it in small steps you can review, whether it runs on Shopify, WordPress, Wix or custom code.
Do I own what you build?
Yes. Everything built for you lives in your accounts and your repository. Open-source pieces keep their own licenses, and I list them at handover.

Tell me about the problem

Priced per project: send a short brief and get a written proposal with the price before any work starts.

Get a proposal by email

The button opens your email with a short brief already laid out. If you write from elsewhere, these are the answers that help most:

  • About me / my company
  • Website or app
  • The problem I want solved
  • Deadline or launch date
  • Budget range (optional)

Emails come straight to me, not to a sales team.

Tech I work with: TypeScript, React, Next.js, Astro, React Native, Node.js, Go and PostgreSQL, plus the platforms clients already use: Shopify, WordPress, Wix and Webflow.

Last reviewed by Arielton Oberek.