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Available for remote junior roles

Backend-minded full-stack developer.

I'm Sebastián — I design data models, secure multi-tenant APIs and ship them with tests and CI/CD. Next.js, NestJS, PostgreSQL, AWS.

See my workDownload résumé

sebastian --stack

languages
TypeScript · JavaScript · Python · SQL · Java (academic) · C++ (academic)
frontend
React · Next.js · Tailwind CSS · Responsive design · PWA
backend
Node.js · NestJS · REST APIs · Authentication (OAuth, 2FA, cookie sessions) · RBAC
data
PostgreSQL (Neon) · Prisma · Row Level Security · Versioned migrations · Relational modeling
cloud & devops
Git · GitHub Actions (CI/CD) · Vercel · Render · Neon · AWS fundamentals
testing
Vitest · Jest · Supertest · End-to-end testing
ai
Gemini API integration · Claude Code in the development workflow

Selected work

Case studies with architecture diagrams

  • demo screenshot · coming soon

    Managerapp

    Founder & Full-Stack Developer · Sep 2026 – Present

    Multi-tenant SaaS for small businesses — in production with 2 real businesses. Found and fixed a silent RLS bypass.

    • Next.js
    • TypeScript
    • PostgreSQL
    • Prisma
    • Better Auth
    • Tailwind CSS
    • Vercel

    Code private · walkthrough available on request

    Read case study of Managerapp
  • demo screenshot · coming soon

    Tu Conjunto a la Mano

    Backend & Database Developer · 2026

    Residential-complex platform. Led backend & data model; 489 E2E tests including tenant isolation.

    • NestJS
    • TypeScript
    • PostgreSQL
    • Prisma
    • React
    • Jest
    • Supertest

    Code private · walkthrough available on request

    Read case study of Tu Conjunto a la Mano

Other projects

  • Parking & Billing System

    Lead Backend Developer

    Academic project: configurable rates (hourly, per-minute, flat), automatic billing and real-time capacity control.

    • Python
    • C++
    • Data structures
    • OOP

  • sebastiannino.me

    Designer & Developer · Nov 2026 – Present

    This portfolio: Next.js, TypeScript and Tailwind with unit and end-to-end tests and CI. Public code.

    • Next.js
    • TypeScript
    • Tailwind CSS
    • Vitest
    • Playwright
    • GitHub Actions
    View source on GitHub (sebastiannino.me, opens in a new tab)

About

I'm an eighth-semester Systems Engineering student who builds real products end to end, with a focus on data modeling, multi-tenant security, testing and CI/CD. I'm drawn to backend, data and cloud work.

I have more than two years of experience supporting US customers in English, and I use AI tools like Claude Code in my workflow while reviewing and testing everything they produce.

Skills

Languages
  • TypeScript
  • JavaScript
  • Python
  • SQL
  • Java (academic)
  • C++ (academic)
Frontend
  • React
  • Next.js
  • Tailwind CSS
  • Responsive design
  • PWA
Backend
  • Node.js
  • NestJS
  • REST APIs
  • Authentication (OAuth, 2FA, cookie sessions)
  • RBAC
Data
  • PostgreSQL (Neon)
  • Prisma
  • Row Level Security
  • Versioned migrations
  • Relational modeling
Cloud & DevOps
  • Git
  • GitHub Actions (CI/CD)
  • Vercel
  • Render
  • Neon
  • AWS fundamentals
Testing
  • Vitest
  • Jest
  • Supertest
  • End-to-end testing
AI
  • Gemini API integration
  • Claude Code in the development workflow

Experience

  1. Foundever (Affirm account)

    Bilingual Customer Service Representative

    Current role. Aug 2026 – Present

    • Support US customers of a buy-now-pay-later fintech in English, handling account and payment cases.
    • Resolve cases using a Salesforce knowledge base and follow compliance guidelines.

  2. Amazon

    Customer Service Associate

    Jun 2024 – Jun 2026

    • Supported corporate and retail customers in English by phone and chat, troubleshooting accounts and orders.
    • Escalated incidents and met performance targets in a high-volume environment.

  3. UNIMINUTO

    B.S. in Systems Engineering

    Expected graduation Dec 2027

    • Eighth semester, evening program.

Certifications & learning

  • AWS Certified Cloud Practitioner (CLF-C02)

    Amazon Web Services

    In progress

    Course completed; exam pending

  • GitHub Foundations

    GitHub

    Course completed

    Course completed on DataCamp

  • MongoDB Associate Developer (Node.js)

    MongoDB

    In progress

  • Cybersecurity Technician

    SENA

    In progress

Let's build something.

hello@sebastiannino.me

Bogotá, Colombia · Spanish (native), English (C1) · Available for remote junior roles