Rulian Estivalletti
that's me —
hi, I'm —

RulianEstivalletti.

Web developer, AI pragmatist, writer, & a serial builder.

Mostly self-taught, twenty years in, and still more curious than when I started.

p.s. — quietly open to
senior & staff roles

Rulian — portrait
that's me —
IIwhat I do

Twenty years in — and a lot to show for it.

Healthcare, security, privacy, food — concept to production to scale, and the long tail of maintenance most engineers never stick around for. Here's the track record, the toolkit, and how I actually work.

20+
years experience
20+
solo projects
7
live products
6
companies, none broke

Where I've been

2025 — now
Staff Engineer · DevOps, CI/CD, production reliability
Leasecake
  • Lead DevOps: CI/CD pipeline optimization and deployment automation.
  • Primary owner of production debugging and reliability across the full stack.
2021 — 2024
Staff Engineer · flagship Vue app, zero-knowledge E2E auth
Cloaked
  • Led the flagship client-facing application, built in Vue.
  • Major contributor to a zero-knowledge, end-to-end encrypted authentication system.
  • Part of engineering leadership driving roadmap and product requirements.
2020 — 2021
Senior Engineer · native→React/Electron migration, lead + UX
StealthBits
  • Led migration of a legacy Windows app to React/Electron as lead developer and UX designer.
  • Moved the team from waterfall to modern, product-led agile.
2017 — 2020
Lead Senior Engineer · founding team, food-as-medicine platform
Tangelo
  • Founding team member; built a food-as-medicine platform from concept.
  • Built enterprise order-management, inventory, and CRM systems.
2010 — 2017
Senior Engineer · HIPAA platform, 10M+ monthly users, ETL
Vitals
  • Lead engineer of a public site serving 10M+ unique users/month on HIPAA-compliant AWS.
  • Drove adoption of Laravel, Elasticsearch, Solr, and MongoDB.
  • Built ETL pipelines processing millions of healthcare datapoints daily.
2005 — 2009
Developer · sole developer, ad agency
Ego Id
  • Sole developer at an advertising agency; full-stack web across many client projects.

What I'm good at — years, and how deep

Core

PHP20 yrs
Laravel12 yrs
JavaScript20 yrs
Node11 yrs

Frontend & mobile

Vue9 yrs
React9 yrs
Tailwind6 yrs
Livewire / Alpine7 yrs
React Native6 yrs

Data

MySQL / Postgres20 yrs
Redis12 yrs
MongoDB10 yrs
Solr / Elastic10 yrs

Working with AI

Agentic developmentearly adopter Building with autonomous coding agents since they were barely usable — 2+ years, daily.
Claude Code2 yrs
Codex1 yr
Multi-agent coding & workflow2 yrs

…and how I work with it all

Everyone says they "use AI." The real question is whether they know when it's wrong. I treat it like any sharp tool — clear goals, hard constraints, judgment. Twenty years tells me where the model is confidently mistaken; architecture and tradeoffs still come from experience.

i.

Specs before code

BDD specs first. The model executes; the thinking behind the spec — and the call on whether it's right — stays mine.

ii.

Claude Code, every day

Primary tooling, not a party trick. Multi-model orchestration where it earns its keep, plain old typing where it doesn't.

iii.

Small, honest pieces

Actions-pattern architecture — single-purpose units a model can extend without a human losing the plot.

IVwhat I'm thinking about

Notes from the bench — writing, half-thoughts, things I post.

Essays when an idea earns the long form, short posts when it doesn't. The decision is usually the story; the code is just evidence.

𝕏PostJun 30

All people are equal. All opinions are not.

𝕏PostJun 30

Argentina playing everyone's favorite underdog: https://t.co/1tF7EgtYXf

𝕏PostJun 24

Agentic coding and AI have confirmed my long held belief that the software industry is a toxic love affair with complexity. They love throwing tools and processes to solve problems, because they think complex = good. There are so many people trying to get AI to fit these old

𝕏PostJun 20

We give money to people who don't seem like they're after it. There's a reason for that — and most founders ignore it.

𝕏PostJun 20

Doing "the right thing" because you're afraid to speak up is just you lying. Lying to yourself is still lying.

𝕏PostJun 19

To understand why you exist, you need to make people feel differently. Not just function differently. Different feature checklists are interchangeable. Different feelings aren't.

EssayJun 7, 2026

You marry the software you write.

We will value each other again... someday.But right now, web development - especially SaaS builders - are undergoing a midlife crisis right now. As AI made coding trivial, and enabled people...

DecisionJun 2, 2026

Why BugJar records nothing by default

Every session-replay tool starts recording on page load and asks forgiveness later. I inverted it: BugJar captures nothing until the user reproduces the bug and explicitly consents to send it. The elevated consent session — one-time, browser-side redaction so sensitive data never reaches a server — was the hard part, and the part worth building.

EssayMay 22, 2026

Tools, Fools and AI: Why building with moral purpose might be the way forward.

TLDR: This very long post is about why I build BugJar. A tool built out of moral needs instead of technical one. Now on with the post..I wanted to start this article by saying that most user...

EssayApr 24, 2026

Everyone is building with AI but nobody's actually selling anything.

Many of you making apps with AI are hitting a wall many of us devs often find insurmountable.You have an idea, and you quickly buy a domain, and use claude code to spin up a working app, you...

EssayNov 23, 2024

AI isn't replacing developers. It's replacing the industry, and that's far worse.

caption...I am not an AI doomer. While AI has created a higher hurdle for junior developers seeking employment, but it’s been a net good for software engineers productivity and capacit...