Gerardo Martínez MongeLiberia, Costa Rica

From a real problem
to software that solves it.

I’m a full stack developer with a background in Business Informatics. I build complete applications, from business rules to the details of the interface.

View projects Get in touch

Open to roles and projectsView résumé

01 / Selected projects

Three projects. Three perspectives.

Product, operations and visual experience. A selection of how I design and build.

01 / Obsidian Library

Personal project · Web application

Obsidian Library

A library for readers and administrators: a catalog, loans, reservations and memberships with Stripe payments.

Next.js · TypeScript · Java · Spring BootView project

02 / La Central

Custom software · ERP + POS

La Central

Sales, inventory, cash management, purchasing and customer credit in one local installation shared by multiple registers.

React · TypeScript · NestJS · PrismaView project

03 / Selvática

Personal project · Web experience

Selvática

A hospitality concept inspired by Arenal: editorial composition, imagery and motion adapted to each device.

Next.js · React · TypeScript · Tailwind CSSView project

02 / Experience

Building with a team, too.

2025 / Remote · Costa Rica

4thewords

Full Stack Developer (professional services contract)

Migrated the account service from PHP to FastAPI while preserving the JSON response contract and frontend compatibility. Kept the initial migration separate from subsequent refactoring.

More about my contribution

Fixed bugs with different root causes (code, browser, extensions) across several microservices: reproducing the issue first, tracing it to its root cause, and only then weighing a few solutions before applying the right one.
Built a configurable tabs component with three design variants integrated into a single component, with GSAP hover animations, following the Figma specs.

2024 / Internship · Costa Rica

Funread

Backend Internship (Django)

Built new backend features in Django for an English-teaching platform.

More about my contribution

Worked with the team on the database and backend logic for a student rewards and gamification system.
Worked with the frontend team to correctly integrate the new endpoints into the student experience.

03 / About me

Understand first.
Build with purpose.

My background in Business Informatics connects two things I care about: how a business works and how software can help. I like following the whole problem, from a person’s needs to the data and rules that support the solution.

I work from Liberia, Costa Rica. I read a lot, enjoy refining interfaces and pay attention to what happens when an operation fails. I’m looking to bring that approach to a team or a custom project.

Tools I work with

Frontend

TypeScript · React · Next.js · Tailwind CSS · Vue.js

Backend

Java · Spring Boot · Node.js · NestJS · Python · FastAPI · Django

Data and tooling

PostgreSQL · Prisma · Docker · Git · GitHub Actions · Playwright

04 / How I can help

From an idea to something you can use.

Custom applications

Management systems, web platforms and API integrations, from business rules to the interface.

Websites with identity

Landing pages and web experiences with attention to composition, navigation, performance and mobile devices.

Evolving existing systems

New features, bug fixes and migrations with verifiable changes and useful documentation.

05 / contact

Tell me what you need to build.

For a project or a job opportunity. You can also email me directly.

From a real problemto software that solves it.