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John Lester Escarlan

Full-Stack Software Engineer

I build full-stack products and AI automation pipelines — from solo-architected marketplaces to LLM-powered workflows, with reliability and end-to-end delivery as the constant.

Portrait of John Lester Escarlan

Selected Work

Four builds. Marketplace, civic tech, business tooling, and AI automation.

End-to-end ownership across different problem spaces — from a solo-built rental marketplace with escrow and identity verification to an LLM-powered job application pipeline. Each project has real stakes and ships to real users.

No. 01Live

Rent N Roll

Two-Sided Platform

Dec 2025

A production rental marketplace architected solo — custodial escrow, identity verification, and dispute adjudication built from scratch.

  • Architected full-stack marketplace solo: escrow, e-signatures, identity verification, and dispute adjudication.
  • Led data layer migration eliminating 24 untyped queries through Supabase RPC patterns and server-side type generation.
  • Multi-tier volume pricing and custodial escrow via PayMongo webhooks.
Mobile Application
No. 02

HEALTH

Led a 5-man team to Semi-Finalist (top 15 of 200+ teams) at the 1st Naga City Mayoral Hackathon.

TypeScriptReact NativeExpoNode.jsPrismaPostgreSQLSQLiteFeb 2026
Web Application
No. 03Live

PriceCraft

Targeted at small Filipino food businesses — a specific, underserved use case.

TypeScriptReactViteTailwind CSSJan 2026
AI Automation
No. 04

Job Pipeline

End-to-end automation: scrape → generate → archive with zero manual steps between.

n8nGroq APIGoogle Sheets APIJavaScriptPrompt EngineeringNov 2025

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
  • Dart
  • C#
  • Go
  • Bash

Frameworks & Libraries

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

Infrastructure

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

Credentials

Experience

  • Freelance Software Engineer

    —Present

    Upwork — Remote

    • Resolved 12+ production-blocking bugs with average turnaround under 24 hours, restoring client workflows fast.
    • Rebuilt internal release automation, cutting 15+ manual steps and reclaiming roughly 4 engineering hours per week for the team.
    • Shipped 3 client-facing features end-to-end across React, TypeScript, and Node.js stacks, scoping requirements directly with non-technical stakeholders before writing a line of code.
    • Wrote technical documentation and API specs for client handoff, reducing onboarding time for new contributors from 1 week to 2 days.

  • Software Monitoring Engineer

    —

    Wind's Gate Philippines — Cebu City

    • Caught and escalated 25+ incidents across 8 production services before they reached end users, owning live uptime visibility for the team.
    • Traced incidents from raw logs to root cause and redesigned the team's incident report format, cutting average triage time by 30%.
    • Authored 8+ runbooks documenting recovery procedures for recurring incidents, enabling on-call engineers to resolve Tier 1 issues without escalation.

  • Software Engineer Intern

    —

    Alliance Software Inc. — Cebu City

    • Delivered 5 production features into live client codebases at one of the Philippines' largest software firms.
    • Worked across the full stack using C# and ASP.NET MVC on enterprise applications used by thousands of daily users.
    • Participated in code reviews, pair programming, and agile ceremonies with senior engineers.

  • Full-Stack Developer Intern

    —

    Bayoa Analytics — Remote

    • Diagnosed N+1 query patterns and schema bottlenecks, cutting API response time from 800ms to 150ms on top-traffic endpoints.
    • Built 10+ REST API endpoints using Node.js and Express to power a new analytics dashboard feature.
    • Wrote reusable React components with TypeScript and Tailwind CSS, speeding up feature delivery for downstream teams.

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