Cristhofer Cousiño · Full Stack Developer
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Cristhofer Cousiño

Full Stack DeveloperFull Stack DevSantiago, ChileChileUTC-3, remoteRemote

I build backends and web applications for clients, most recently an accounting automation portal for a construction team in the United States. Before that I led the platform work on Replicator, a BI and data replication system that pulls construction ERPs into a single warehouse. I founded 688labs, a software studio.

I work mostly in Java, Go and TypeScript, on Spring Boot, Next.js and PostgreSQL. Self-taught, shipping production software since 2023, and certified C2 in English.

amarucouss@gmail.comEmail
github.com/nearestdevGitHubLinkedInamarucouss.comWebsite
Cristhofer Cousiño
Now
Looking for work.
Roles
Backend, full-stack and product engineering. Full-time, contract or long-term.
Reach me
amarucouss@gmail.com

Work

Click any screenshot to open the full set. All repositories

Software

8
2026Open source

Completionist

Go and Next.js monorepo for a social tracking platform. Auth, profiles, lists, posts, challenges and websocket messaging, with media pulled from TMDB, Jikan, RAWG, Google Books, Steam and Last.fm behind one interface.

Go 1.25Next.js 16PostgreSQLWebSocketsAWS S3
Code
2026Live

Total Trades Integrated

Brand site for a commercial and industrial contracting firm covering MEP, welding and construction. Built around their service structure and a quote request flow.

Next.js 15React 19TypeScriptTailwind CSS 4
Visit
2026Live

688labs

Software studio I founded with a friend. Bilingual site for the studio, presenting what we build and how we work.

Next.js 16React 19TypeScriptTailwind CSS 4
Visit
2026Private

Accounting Automation Portal

Internal portal for a construction company's accounting team. Generates lien waivers, auto-files incoming vendor PDFs, tracks compliance by project and vendor, and holds outgoing emails in a review queue. Microsoft SSO with role-based access and an audit log.

PythonFastAPINext.js 15React 19PostgreSQLAWS
2026Private

Habit Tracker

Go API and Next.js client where progression is computed server-side: XP, levels, streaks and weighted attributes, with protected history edits and CSV exports.

Go 1.25Next.js 16PostgreSQLBunTailwind CSS 4
2026In progress

Adaptive Commerce Platform

Backend-first headless commerce monorepo. A Go core drives both the storefront and the admin dashboard, with payment and delivery providers behind adapters and runtime profiles per brand.

Go 1.25Next.js 15PostgreSQLBunTebex
2025Private

Replicator

BI and data replication platform for construction. Discovers schemas in legacy ERPs (Viewpoint Vista, Spectrum), streams them into a Postgres warehouse, and exposes a visual query builder and drag-and-drop dashboards on top.

Java 21Spring BootNext.js 16PostgreSQLAWS
2025Private

SaaS Scheduling System

Booking platform for service businesses. Availability is computed in the database against per-staff schedules and exceptions, with subdomain multi-tenancy and a point of sale for inventory and daily close.

Java 21Spring BootNext.js 16PostgreSQLTailwind 4

Game development

4
2026Private

Hero Arena Gamemode

Round-based hero PvP for a Minecraft event server, plus the tournament backbone it runs on: a Velocity proxy holding team and score authority, a lobby plugin, and an API other minigames plug into.

JavaPaperVelocityRedisWebSocketsGradle
2026Private

Minecraft Chaos Randomizer

Paper plugin that turns Minecraft into a hardcore run: 50 tunable chaos events on weighted schedules, randomized drops, crafting and spawns, and a world reset on death.

JavaPaperMythicMobsBetterHudBetterModelGradle
2025Open source

Paper Setup Plugin

Gradle plugin that sets up a PaperMC server for plugin development: downloads the jar, accepts the EULA, installs the built plugin and runs it. Published on the Gradle Plugin Portal.

KotlinGradleREST APIsBuild Automation
Code
2026Open source

Hytale Setup Plugin

Gradle plugin for automated Hytale server setup: versioned downloads, asset extraction, release channels, and an interactive local run task.

KotlinGradleHytale DownloaderJVM Toolchains
Code

Experience

2023 - Present

Software Engineer · Freelance

Custom software for clients in Chile and the United States: backend services, internal tools and user-facing applications.

  • Built an accounting automation portal for a US construction firm: three FastAPI services behind a Next.js front end, Microsoft Entra ID single sign-on, role-based access and an audit log.
  • Shipped product and marketing front ends in Next.js and React, plus the REST APIs behind them, with explicit contracts and versioned PostgreSQL migrations.
  • Ran client work end to end in English: scoping, delivery on a date, and handover that stayed maintainable.
JavaKotlinGoPythonNext.jsTypeScriptPostgreSQLFastAPIAWS
2024 - 2025

Lead Software Engineer · Replicator Platform

Led design and development of a BI and data replication platform connecting legacy ERPs with modern analytics workflows.

  • Designed a hybrid multi-tenant model in PostgreSQL: one schema per tenant for ERP data, row level security for shared metadata.
  • Built a replication engine in Java 21 that discovers legacy ERP schemas, runs full or incremental loads, and streams into Postgres in binary format.
  • Delivered a Next.js front end with a visual query builder, drag-and-drop dashboards and S-curve financial forecasting.
  • Deployed AWS infrastructure using Secrets Manager for external credentials and OAuth2/OIDC for identity.
Java 21Spring BootNext.jsPostgreSQLAWS

Curriculum vitae

One page, English or Spanish

PDF or DOCXsingle columnupdated 2026

Read onlineRead
Languages
Spanish, native
English, CEFR C2View EF SET certificate
Based in
Santiago, Chile
UTC-3 · remote, hybrid or on-site
Education
Self-taught
Since 2023, through docs and shipped projects
Core stack
Java, Go, TypeScript
Spring Boot, Next.js, PostgreSQL, Docker, AWS
Also worked with
Kotlin, Python
FastAPI, Redis, Terraform, Azure, Paper API
Open to
Backend, full-stack, product
Full-time, contract or long-term collaboration

Contact

Send the role or the problem you are trying to solve and I will reply with the closest thing I have built.

amarucouss@gmail.com
GitHub
github.com/nearestdev
LinkedIn
Cristhofer Cousiño
English certificate
EF SET, C2 Proficient, 80/100
© 2026 Cristhofer CousiñoSantiago, Chile