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Senior Full-Stack Engineer
SergioSabino
7+ years building scalable digital products across SaaS, FinTech, and InsurTech. Expert in Next.js, TypeScript, and Node — with a track record in AWS/Docker infrastructure and Applied AI.
eldomi.dev — zsh
$ cat portfolio.ts
const stack = ['Next.js', 'TypeScript', 'Node.js'];
const yearsExp = 7;
const available = true;
$ ▊
available
Open to work
experience
7+ years
Current Stack
React◆
Next.js◆
TypeScript◆
Node.js◆
PostgreSQL◆
GraphQL◆
Docker◆
AWS◆
Tailwind CSS◆
Prisma◆
React◆
Next.js◆
TypeScript◆
Node.js◆
PostgreSQL◆
GraphQL◆
Docker◆
AWS◆
Tailwind CSS◆
Prisma◆
FULL-STACK
NEXT.JS
TYPESCRIPT
REACT
NODE.JS
AVAILABLE FOR WORK
SENIOR ENGINEER
SAAS BUILDER
FINTECH
FULL-STACK
NEXT.JS
TYPESCRIPT
REACT
NODE.JS
AVAILABLE FOR WORK
SENIOR ENGINEER
SAAS BUILDER
FINTECH
FULL-STACK
NEXT.JS
TYPESCRIPT
REACT
NODE.JS
AVAILABLE FOR WORK
SENIOR ENGINEER
SAAS BUILDER
FINTECH
FULL-STACK
NEXT.JS
TYPESCRIPT
REACT
NODE.JS
AVAILABLE FOR WORK
SENIOR ENGINEER
SAAS BUILDER
FINTECH
Expertise
What I Build With
Frontend
Crafting pixel-perfect UIs with modern frameworks and animation-driven UX.
React
Next.js
TypeScript
Tailwind
Backend
Scalable APIs and server architectures.
Node.js
PostgreSQL
Prisma
DevOps
Container orchestration and cloud deployment.
Docker
AWS
Data & APIs
GraphQL, REST, Redis caching.
GraphQL
Redis
Tooling
Git, CI/CD, and developer experience.
Git
Career
Where I've Built
01
Full-Stack Developer
Nayhira Gonzalez LLC
Jan 2024 – Present
Miami, FL (Remote)
Architected a complex workspace management system using Next.js and WebSockets, featuring real-time collaborative boards and dynamic data tables. Engineered a scalable API layer with Nest.js and Prisma, implementing advanced validation patterns. Integrated DocuSign, Calendly, and Mailchimp, and leveraged LLMs for automated data extraction — reducing operational overhead by 40%.
Next.jsNest.jsTypeScriptPrismaPostgreSQLWebSocketsAWSDocker
02
Semi-Senior JavaScript Developer
Aerolab Digital
Jul 2022 – Jan 2024
Buenos Aires, AR (Remote)
Cocos Capital (FinTech): High-concurrency frontend architecture improving page load by 25%. NaranjaX (Digital Bank): 100% WCAG-compliant UI serving millions of users. AymurAI (GovTech): AI-driven text anonymization engine cutting manual review by 60%. Prive (Shopify): Recurring billing dashboard managing thousands of active subscriptions.
Next.jsReactNode.jsTypeScriptGraphQLShopify APIsJestStorybook
03
Founder & Full-Stack Developer
Cerobucks, LLC
Jan 2020 – Jun 2022
Sheridan, WY (Remote)
Developed an end-to-end ride-hailing platform with React Native and Node.js, scaling to hundreds of daily trips in Mexico. Designed a real-time CRM for real estate with PostgreSQL and integrated multi-currency payments via Stripe and PayPal, automating financial reconciliation for vendors.
React NativeNode.jsPostgreSQLMongoDBStripePayPalDockerDigitalOcean
04
Founder & Software Developer
ZERDALY, LLC
Apr 2019 – Apr 2020
Middletown, DE
Directed full-stack development of diverse web products using React and MongoDB, managing the entire lifecycle from design to CI/CD deployment on DigitalOcean.
ReactNode.jsMongoDBAWSDigitalOceanGitHubGitLab
Portfolio
Featured Work
Production-ready freemium SaaS platform with 100+ active users. Drag-and-drop stage plot editor powered by Fabric.js, with tiered access control (free/freemium/premium), local storage and cloud sync, and professional PDF/JSON exports. Full auth, subscription logic, email workflows (Resend + React Email), and Zod-validated API routes — built and maintained independently.
Next.js 15PostgreSQLPrismaAuth.jsZustandFabric.jsTailwind CSS v4ResendZod
Nayhira Portal CMS
A collaborative workspace management system. Functions as a CMS/ERP for projects, data, and real-time collaboration. Features advanced CRUD, multi-row selection, inline editing, and side-panels.
Next.jsNode.jsPrisma
Integral Victim Administration System (SIAV) developed for the Judiciary of Entre Ríos. Manages accommodation for vulnerable people, capacity tracking, and admissions/discharges with a role-based access system.
ReactTypeScriptTanStack Query
Beyond the Code
My journey isn't just about software; it's about engineering solutions that matter. From founding startups to optimizing fintech platforms, I thrive on solving complex problems.
When I'm not coding, I'm diving into Sound Engineering at ITLA, mixing my passion for audio with technical precision.
Education
ITLA: Sound Engineering
In Progress | 2024 – 2026
Combining creativity with technical discipline.
Platzi: Professional Software Development
2019 – Present
Continuous learning across multiple specialized tracks and certifications.