Portrait of Stephen Sagarino Jr.

Stephen Sagarino Jr.

Software Engineer & Tech Lead

Open to full-time & remote roles

I build reliable backends and distributed systems.

3+ years across backend, distributed, full-stack, mobile, and embedded systems.

Get in touch Download résumé

Cebu, Philippines · UTC+8 · Comfortable with overlapping US / EU / AU hours

Prefer something playful? Explore the OS edition of my portfolio

02 · Live products

Shipped, in production, used by real people

skloud.app
SKLoud App landing page

Tech Lead · SKLoud

SKLoud App

A civic platform that connects SK Councils with the youth they serve: event calendars, announcements, community initiatives, and perks from local merchants.

  • Nuxt.js
  • Laravel
  • TypeScript
  • PostgreSQL
  • AWS
clock.me
Clock Me landing page

Software Engineer / iOS Developer · Vauldex

Clock Me

A calendar-style time tracker. Tap an event on your calendar to start tracking, then see exactly where every hour went.

  • iOS
  • Android
  • Web
piramovie.stsagarino.com
PiraMovie home screen with a featured title and a Top 10 row

Side project · Solo

PiraMovie

A streaming-style web app for movies and series, with a Top 10 row, browsing by type, and a personal watch list.

  • Vue
  • TypeScript

Just for fun

Prefer something playful? Try the OS edition.

My previous portfolio, reimagined as a macOS-style desktop, complete with windows, a dock, and a terminal.

Open os.stsagarino.com
Portfolio styled as a macOS desktop with a browser window, dock, and desktop icons

03 · Experience

Where I've made an impact

  1. Oct 2025 – Present Current

    Software Engineer / Tech Lead @ SKLoud

    • Architected and built a custom Rust blockchain from scratch for transparent financial transactions, public records, and document verification.
    • Designed a Byzantine Fault Tolerant consensus layer inspired by Tendermint / CometBFT covering validator communication, transaction validation, and network sync, validated on a 20-validator internal network.
    • Built tamper-resistant audit trails by anchoring document hashes and metadata on-chain for government-related records.
    • Lead technical direction for the SKLoud App within a 15-member engineering org and directly mentor 3 engineers through code reviews, task assignment, and sprint planning.
    • Established engineering workflows and architecture standards, and introduced AI-assisted workflows to cut repetitive work.
    • Rust
    • TypeScript
    • Nuxt.js
    • Laravel
    • PostgreSQL
    • Docker
    • AWS
  2. May 2026 – Sep 2026

    Firmware Engineer @ Lanex Corporation

    • Wrote a Python automation script that cut string-generation time from 15 minutes to 2 seconds.
    • Built Bash tooling to deploy binaries from the build server to a Linux simulator, turning a 5-minute task into ~5 seconds.
    • Supported debugging, testing, and integration workflows for printer firmware development.
    • C
    • C++
    • Python
    • Bash
    • Linux
  3. Jul 2024 – Jan 2026

    Software Engineer / iOS Developer @ Vauldex Technologies

    • Designed a real-time WebSocket architecture in Play Framework (Scala) with Apache Pekko Actors and Command-Event.
    • Architected a new Play Framework service focused on scalability, clean structure, and multi-developer workflows.
    • Strengthened type safety with Scala 3 opaque types and TypeScript branded types to enforce domain rules at compile time.
    • Optimized an infinite-scroll iOS view, cutting memory usage 75% (400 MB to 100 MB) and smoothing scroll performance.
    • Scala 3
    • Play
    • Pekko
    • Swift
    • SwiftUI
    • TypeScript
    • Nuxt.js
    • PostgreSQL
  4. May 2023 – Dec 2023

    Backend Developer @ Megaland Realty

    • Designed and built the company website's backend from scratch with Node.js and Express, serving a Vue.js frontend.
    • Node.js
    • Express
    • Vue.js

04 · Open Source

Code that other people depend on

Merged PR #4146★ 6.4k

Orval

OpenAPI-to-TypeScript generator. Shipped a feature making its TypeDoc dependencies optional.

View pull request
Merged PR #8★ 180+

Zoomable

Swift library. Brought macOS 14+ support to a project that previously supported only iOS.

View pull request
Author★ 120+

tttui

Terminal typing test, migrated from Python to Rust. Listed in awesome-tuis (20k+ stars).

View repository
Merged PR #1

InfiniteScrollView

SwiftUI. Refactored the content initializer to support @ViewBuilder.

View pull request
Author

SwiftNetworkKit

Swift networking library for HTTP requests and WebSocket communication.

View repository

05 · Projects & Awards

Built under pressure, recognized by judges

🏆 Grand FinalistJan 2026

DAPPropTech

PropTech Sinulog Hackathon. Built mobile and full-stack components for an app combining passport NFC verification, AI contract analysis, and blockchain-backed document signing.

  • Mobile
  • NFC
  • AI
  • Blockchain
🥇 1st Place2024

Pre-ICT Congress

Engineered the backend of a youth barangay scoring system.

  • Backend
Side project2024 – 2025

Check Me

Real-time collaborative checklists with CRDT sync.

  • CRDT
  • Play
  • Nuxt.js

06 · Toolkit

What I work with

Strongest in

  • TypeScript
  • Scala
  • Rust
  • PostgreSQL
  • Docker
  • Linux
  • AWS

Languages

  • JavaScript
  • Swift
  • Python
  • C
  • C++
  • PHP
  • Java
  • Kotlin
  • Bash

Frameworks

  • Node.js
  • Express
  • Play Framework
  • Apache Pekko
  • Laravel
  • Vue.js
  • Nuxt.js
  • React
  • SwiftUI

Data & Infra

  • MySQL
  • SQLite
  • GitHub Actions

Concepts

  • Backend Architecture
  • Distributed Systems
  • BFT Consensus
  • WebSockets
  • CRDTs
  • Testing & Debugging

Education

B.S. Computer Science · University of Cebu, Main · 2020 – 2024

07 · Contact

Let's build something solid together.

I'm actively looking for my next role in backend, distributed systems, or full-stack engineering. I usually reply within 24 hours.

Email me Connect on LinkedIn Résumé (PDF)