Hire · Backend Developer · Node & NestJS
Hire a Node.js & NestJS Developer
I'm Nixon Marrasquin, a senior backend developer. I build clean, tested, scalable APIs with NestJS, Node.js and PostgreSQL, GraphQL or REST, auth, integrations and the deploy. Remote, GMT-5, USD, hired directly.
APIs built to last, not just to work today
A backend that works in the demo and falls over in production is the most expensive kind. I build with clear module boundaries, validation, tests and sane data modelling so the API stays maintainable as the product grows.
- NestJS architecture with clean modules and dependency injection
- PostgreSQL schema design, indexing and query performance
- GraphQL and REST APIs with proper validation and error handling
- Auth (JWT/OAuth), roles, rate limiting and security basics
New builds and rescue work
Whether you're starting fresh or inheriting a messy Node codebase, I can help. I design new backends and I also come into existing ones to stabilise, extend and refactor them.
- Architect a new API: schema, endpoints, auth, tests, deploy
- Fix and extend an existing Node/NestJS backend
- Pay down technical debt without a risky full rewrite
- Integrations: Stripe, queues, Redis, webhooks, third-party APIs
One person for API and UI
Because I'm full stack, you can hand me the whole slice, the NestJS API and the React/Next.js frontend that uses it, so there's no blame gap between a separate backend and frontend contractor.
- Backend: NestJS, Node, PostgreSQL, GraphQL, REST
- Frontend: React, Next.js, TypeScript when you want it
- Shipped production systems: Nelson GO, Semillapp, DeWallet + APIs
How we'd work together
I onboard as a contractor into your team and stack, and adapt to your conventions from day one.
- Your repo, Git flow, PR reviews and CI
- Standard contractor agreement with full IP assignment
- Full-time, ongoing contract, or a scoped API build/refactor
Frequently Asked Questions
What teams ask before hiring a backend developer.
What's your backend stack?
NestJS and Node.js with TypeScript at the core, PostgreSQL for data (Prisma/TypeORM), GraphQL and REST APIs, plus Redis, queues, auth (JWT/OAuth), Stripe and third-party integrations. I deploy with Docker and CI to Vercel, Railway or a VPS, whatever fits the project.
Can you design an API from scratch and also fix an existing one?
Both. I can architect a new backend, schema, endpoints, auth, validation and tests, or come into an existing Node/NestJS codebase to fix bugs, add features, improve structure and pay down technical debt without a full rewrite.
Do you write tests and care about scalability?
Yes. I write unit and integration tests, use clear module boundaries (NestJS makes that natural), add proper validation and error handling, and design queries and indexes so the API holds up as data and traffic grow. Backend problems are expensive to discover in production, so I try to prevent them.
Are you backend-only, or can you go full stack?
Backend is my focus here, but I'm full stack: React and Next.js on the front. That's useful when you want one person to build the API and the UI that consumes it, with no integration gap between two contractors.
What about time zone and billing?
I'm in Ecuador on permanent GMT-5 (US Eastern, no DST), so we share working hours all year. Contracts are billed in USD (Ecuador is dollarized) and you hire me directly with no agency markup.
Full-time, contract, or per project?
All three. A full-time backend seat, an ongoing contract, or a scoped API build/refactor. Standard contractor agreement with full IP assignment, typically starting within a week or two.
Let's talk
Need a backend that scales without surprises?
Tell me about the API or backend problem and I'll reply within minutes with approach, fit and next steps. Email is fastest.