Nixon Marrasquin, Senior Full Stack Developer (React, Next.js, React Native)
Senior Full Stack Developer based in Ecuador (GMT-5) specialized in React, Next.js, TypeScript, NestJS and React Native. 3+ years building production web and mobile applications for companies in Ecuador and international clients. Open to remote full-time, contract and consulting opportunities across Latin America, Canada and the United States.
Services
Tech stack
React, Next.js (App Router), TypeScript, Tailwind CSS, shadcn/ui, Radix UI, GSAP, Framer Motion, Three.js, TanStack Query, Zustand, React Native, Expo, NestJS, Node.js, FastAPI, Python, Django, GraphQL, REST, Prisma, TypeORM, PostgreSQL, MySQL, MongoDB, Redis, Typesense, Directus, Refine, Turborepo, Docker, Tauri, Electron, Bun, Supabase, Clerk, Casbin, Stripe, AWS S3, Railway, Vercel, Google Analytics, OpenAI, Anthropic (Claude), Apple Wallet, Google Wallet, WebCrypto and PAdES-B signing, WordPress, WooCommerce, SAP Business One.
Products and platforms
Mobile apps in production
Semillapp (loyalty and coupons), FirmaOK (digital signature), Nelson GO (delivery), Siglo 21 (B2B e-commerce) and DeWallet (sales incentives), built with React Native and Expo for iOS and Android.
Domains of experience
Fintech and electronic invoicing, digital signature and cryptography, loyalty and wallets, point of sale (POS) and retail, e-commerce and delivery, identity and authentication, CMS and content platforms, marketing and SEO automation, AI automation, and digital media.
Career
Contact
Email: nixonmarras@gmail.com. LinkedIn: linkedin.com/in/nixon-marrasquin. GitHub: github.com/nixonmarrasquin. Average response time: 5 minutes during business hours.
I design and ship web and mobile apps that load fast, stay reliable, and scale with the business. Specialist in React, Next.js, NestJS and React Native . 3+ years in production.
A mix of custom platforms and sites I've shipped: SaaS products, billing & fintech platforms, digital media, internal tools, e-commerce and podcasts. Different stacks, same goal: code that ships and stays.
One React Native codebase, two App Stores, native feel. Real users open these apps every day, across delivery, fintech, retail and B2B.
Delivery app
Digital coupons
B2B ecommerce
Sales incentives application
Built for users that actually open the app.
Production platforms I've designed, built and shipped: electronic invoicing, digital signature, loyalty, AI automation and high-conversion websites. Different stacks, same standard.
Electronic-invoicing platform for Ecuador's SRI: multi-tenant admin, PDF microservices and taxpayer lookup. Refine, NestJS, GraphQL and AWS S3.
Digital-signature suite (PAdES-B): sign and validate PDFs with .p12 certificates fully offline, on mobile and in the browser.
Every project follows the same principle: clean architecture, type safety, and performance from day one. No shortcuts, no tech debt on purpose.
Projects shipped
Lighthouse score
Tech debt
Multi-tenant AI assistant that sells products, answers customers and books appointments. NestJS, GraphQL, OpenAI and semantic search.
SEO-first websites and landing pages: technical SEO, Core Web Vitals, GSAP animations and conversion-focused UX/UI that turn visits into clients.
Where I've worked and what I shipped.
Developer at Azirgo SAS building and shipping production platforms: FactuPlan (SRI electronic invoicing), FirmaOK (offline PDF digital signature), Semillapp (loyalty + Apple/Google Wallet), Azirid (auth-as-a-service) and AI WhatsApp chatbots, with React, Next.js, NestJS, React Native, GraphQL and Prisma.
Developed several administrative dashboards using Django with REST APIs (Python). Monitored workflows in SAP Business One. Built e-commerce mobile applications with React Native and Expo for B2B commerce.
Worked as a freelancer on WordPress sites with WooCommerce and API integrations for small and medium e-commerce stores.
By the numbers
Tech and brands I've worked with
Scrolling ∞
Workflow
Claude Code is my daily collaborator. Not a replacement for judgement, but a tool that removes friction between an idea, production code, and the docs that ship with it. Custom skills, SEO audits, code reviews, refactors: all orchestrated from the terminal.
Every task type has its own slash-skill: a template with a checklist, criteria and style that lives in .claude/skills. I invoke /seo-audit to review landing pages, /frontend-design to rework a section, /copywriting to kill AI slop. Result: short iterations, clearer decisions, zero context lost between sessions.
faster on large refactors
to first reviewable draft
between design, code and docs
Technical and on-page audits
Premium components, no AI slop
Conversion-focused editing
Scroll-driven animations
LLMO and AEO for citations
Structured data
What you're looking at
This site was iterated with Claude Code: hero, audits, bilingual SEO, structured FAQs, GSAP ScrollTrigger, tightened copy. Every commit had a human in the loop.
See commits on GitHubStack
The tools I reach for every day.
Total
42.
Active tools
Tell me what you're building. I'll reply with thoughts in hours, not weeks.
What recruiters and clients usually ask before reaching out.
I'm based in Ecuador, which sits permanently on GMT-5, the same as US Eastern Time. Ecuador does not observe daylight saving, so the overlap is predictable year-round. You get full real-time collaboration during a normal US or Canadian workday, plus solid overlap with the rest of LATAM.
You hire me directly, so there's no marketplace markup sitting on top of my rate. You also get one accountable senior engineer rather than a rotating pool. Ecuador uses the US dollar, so there's no currency risk, and you still get the nearshore cost advantage of roughly 50-70% versus a comparable US hire.
3+ years shipping production web and mobile apps with React, Next.js, TypeScript, React Native, Expo, NestJS, Node, GraphQL and PostgreSQL. I've delivered 15+ projects across e-commerce, delivery, digital couponing and B2B commerce serving thousands of users. I work fullstack, so I can own a feature from database to UI.
Native Spanish and B2 English. I run technical meetings, write documentation, code reviews and pull requests, and handle async communication in English without friction. Being bilingual also helps if you need to bridge English-speaking stakeholders with a Spanish-speaking team or market.
Yes. I'm comfortable joining an existing repo, following your conventions, working in Git with PRs and code reviews, and collaborating with product and design. I can plug into your workflow as a contractor rather than asking you to adapt to mine.
All three. I take on full-time remote roles, ongoing contract work, and scoped one-off projects or MVPs. Tell me the shape of the engagement and I'll be upfront about availability and a realistic timeline.
I usually reply within about 5 minutes during business hours. Start date depends on current commitments, but for scoped projects I can typically kick off within a week or two once we align on scope. Email or LinkedIn is the fastest way to reach me.
