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John Lester Escarlan

Full-Stack Software Engineer

I build web and mobile products with a backend-first focus, keeping reliability in production through clean architecture and thoughtful decisions.

Portrait of John Lester Escarlan

Selected Work

A focused set of builds across product, backend, and developer tooling.

Each project solves a concrete problem, from pricing and healthcare access to scheduling, mapping, and personal finance.

Featured · Web Application / Personal Finance

Kaizen

A personal finance web app for Filipino students and young adults featuring transaction tracking, budget management, a Hold Vault for pausing impulse purchases, and a regret-tagging system called "Sayang".

  • TypeScript
  • React
  • Java
  • Spring Boot
  • PostgreSQL
  • Tailwind CSS
View projectGitHub ↗
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About

Experience, education, and the stack behind it.

From production monitoring to full-stack product delivery, the throughline is keeping reliability, observability, and automation front and center so the systems stay useful in real-world use.

Skills

Languages

  • TypeScript
  • JavaScript
  • Python
  • Java
  • C#

Frameworks & Libraries

  • React
  • Next.js
  • React Native
  • Node.js
  • Express.js
  • Spring Boot
  • ASP.NET
  • Tailwind CSS
  • TanStack Query
  • Vite
  • Vitest
  • JWT/OAuth2 Authentication

Infrastructure

  • PostgreSQL
  • PostGIS
  • MongoDB
  • SQLite
  • Redis
  • Drizzle ORM
  • Prisma ORM
  • Docker
  • Kubernetes
  • GitHub CI/CD
  • AWS
  • Vercel
  • Supabase
  • Git

Credentials

Experience

  • Freelance Software Engineer

    —Present

    Remote

    • Diagnosed and resolved production-blocking issues under time pressure, directly restoring system workflows for end users.
    • Strengthened internal developer experience by overhauling automation tooling, cutting repetitive manual steps for the engineering team.

  • Software Monitoring Engineer

    —

    Wind's Gate Philippines — Cebu City

    • Own uptime visibility for distributed production systems, catching and escalating incidents before they impact end users.
    • Traced root causes from raw logs and alerts, turning ambiguous system noise into actionable incident reports for engineering teams.

  • Software Engineer Intern

    —

    Alliance Software Inc. — Cebu City

    • Delivered features that passed production code review standards at one of the Philippines' largest software firms.

  • Full-Stack Developer Intern

    —

    Bayoa Analytics — Remote

    • Applied mathematics-informed thinking to identify and fix N+1 query patterns and schema inefficiencies, measurably improving backend response performance.

Education

  • Bachelor of Science in Computer Science

    —Present

    University of the Philippines

    • University Scholar (consistent academic honor)
    • Semi-Finalist, 1st Naga City Mayoral Hackathon

  • Bachelor of Science in Mathematics

    —

    University of the Philippines

    • College Scholar (consistent academic honor)
    • DOST Junior Level Science Scholarship (JLSS) Awardee

Contact

Open to software engineering roles and product-focused collaborations.

If you need someone who can ship across the stack, reason clearly about systems, and improve reliability along the way, send an email. I usually reply within 48 hours.

Start with an email
Send Email
jlescarlan11@gmail.comView Resume