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Nicaragua · Remote

I build full-stack features and stay accountable for every one.

Full-stack developer, four years in — comfortable from the React UI down to the database, and the API in between. I like getting close to the problem: gathering requirements, picking up whatever tech the job needs, and finding a cleaner way through. AI is part of that workflow now — with Claude Code I run a spec → code → test → review pipeline that keeps me accountable for what ships, so the people I work with can focus elsewhere while I handle my piece. Currently contributing to production systems at Top Floor Marketing.

POST /engineers/martin-tercero
200 OK 142ms application/json
{
"role": "Full Stack Developer",
"ships": ["frontend", "REST APIs", "databases"],
"enjoys": ["requirements", "new problems", "new tech"],
"ai": "daily — a disciplined tool, not a shortcut",
"stack": ["Next.js", "NestJS", "Supabase"],
"based": "San Marcos, NI"
}

Currently

Feb 2025 — present

Backend Developer — Top Floor Marketing

MVP 2025 Awarded most valuable player of the software team.

I work on All-in-Agents, a travel-agency platform (NestJS API + React/Vite client) that launched to production in December 2025. On the backend I've built authentication and agency-based access control, a headless CMS with third-party integrations, a rewards point-redemption system, and transactional email on Prisma over PostgreSQL. On the frontend I've shipped multi-step forms with cross-step validation, the account flow, and shared UI components — plus full English/Spanish internationalization and Sentry monitoring across the live app. Backend to browser, I take features from requirement to production and stand behind what I ship.

Dec 2025
All-in-Agents shipped to production and in daily use
4+
years shipping production software
5+
client sites delivered for US & LATAM businesses

Selected work

4 endpoints
POST /alquifiestas/reservations 200 OK

Alquifiestas y Eventos

Self-directed · party-supply rental business · 2025

Solo developer — front-to-back

A rental-and-events platform for a family-owned party-supply business — built solo, front-to-back, and running in production.

  • Next.js 16
  • React 19
  • TypeScript
  • Supabase
  • PostgreSQL (RLS)
  • Edge Functions
  • Claude Code
The problem
The business booked rentals out of messages and memory, with no catalog and nothing tracking what was already reserved. Double-bookings were a matter of when, not if.
What I built
The whole platform on Next.js and Supabase — public catalog, guest reservation flow, and a staff panel. At its core, a rental availability engine (occupancy windows, overdue blocking) written as SQL RPCs over RLS-locked tables, so the booking rules can't be bypassed from the client. Plus web-push order alerts and auto-generated receipt PDFs.
What was hard
Staying accountable for code built with AI. I drove the build with a Claude Code pipeline (spec → code → test → review), but availability logic in SQL isn't something you trust because a model wrote it — so review was the gate, with rules like void-not-delete. AI made it faster; being careful about what shipped was the point.

Archive

9 earlier builds

Earlier client sites, personal projects, and coursework — kept for range, not weight.

  • 2024 ServiYA

    Services marketplace MVP — I owned the real-time chat module end to end, frontend and backend, on a two-month sprint.

  • 2022 Grupo SEEG

    Corporate site for a Guatemalan company — responsive build that gave them a modern online presence.

  • 2023 Shoppi

    E-commerce front end on the FakeStore API — client-side routing, category filtering, and cart state.

  • 2023 Travel Now

    Responsive travel landing page with a dark mode toggle.

  • 2022 To-Do App

    React to-do app built while learning render patterns and state management.

  • 2022 Movie DB

    Vanilla JavaScript client fetching genres, titles, and descriptions from the MovieDB API.

  • 2021 Music Grid

    CSS Grid layout exercise — a restaurant menu page.

  • 2021 Blog Layout

    Early static layout built with HTML and CSS only.

  • 2021 Batata Bit

    First mobile-first responsive build, done as a clone exercise.

Stack

Backend

  • NestJS
  • Express.js
  • PostgreSQL
  • Prisma
  • Supabase
  • REST API design
  • Auth & authorization

Frontend

  • React
  • Next.js
  • TypeScript
  • JavaScript
  • Tailwind CSS
  • HTML5 / CSS3

DevOps & tools

  • Git / GitHub
  • Docker
  • Vercel
  • Figma
  • ClickUp / Trello
  • Slack
  • Claude Code

Languages

  • Spanish (native)
  • English (C1)

Education & certifications

  • M.S. Information Systems — Data Analytics

    Harding University · GPA 3.4

  • B.A. Computer Science

    Harding University · GPA 3.6 · Walton Scholar

  • Tableau Desktop Specialist

    Verify on Credly ↗
  • TypeScript · Full Stack JavaScript · Supabase

    Platzi certifications ↗