ES

Lima, Perú — Available for work

Barclay Leach

Full Stack DeveloperCo-founder & CEO at CernextBilingual Interpreter EN/ESSystems Engineering Student

I build production web systems — from GSAP scrollytelling to Next.js platforms, payment gateways and AI chat automation.

See my workContact
01 — About

I ship things that run in production, not in a sandbox.

I'm a Systems Engineering student at Universidad Continental and co-founder & CEO of Cernext, a digital agency delivering web development, technical SEO, paid media, ERP/CRM systems and AI chat automation.

My day-to-day is Next.js and React on the front, Node.js and Supabase on the back, and GSAP whenever a page needs to feel alive. I've built scrollytelling landing pages embedded in WordPress, custom reservation plugins wired to the Telegram Bot API, payment-enabled fitness platforms and a React Native app on Expo.

I also interpret English–Spanish in real time for medical, legal and financial calls at LanguageLine Solutions — which is where I learned that precision under pressure is a technical skill too.

Portrait of Barclay Leach
0
Live products shipped
0
Years writing code
0
Languages spoken
0
Certifications
02 — Stack

The tools I actually use.

Not a wish list — every item below is in something that's live right now.

Languages

  • JavaScript (ES6+)
  • TypeScript
  • PHP
  • SQL

Frontend

  • React
  • Next.js
  • React Native
  • GSAP
  • Tailwind CSS
  • SASS
  • HTML5
  • CSS3

Backend

  • Node.js
  • Express
  • RESTful APIs
  • Nodemailer
  • Supabase

Databases

  • PostgreSQL
  • MySQL
  • Supabase
  • NoSQL

Tools & Platforms

  • Git
  • GitHub
  • Vercel
  • Cloudflare
  • IONOS
  • WordPress
  • Vite
  • Expo

Growth & Marketing

  • Technical SEO
  • Google Ads
  • Meta Ads
  • Meta CAPI
  • ManyChat
  • WhatsApp Business API

AI & Automation

  • Claude Code
  • Generative AI Integration
  • AI Chatbots
  • ERP / CRM
  • Business Intelligence
03 — Experience

Where I've been building.

01May 2026 – Jun 2026

Aguxtin

Frontend Developer — Scrollytelling Landing Page

Remote

  • Built an immersive scrollytelling landing page for a conscious design e-commerce brand, embedded via full-viewport iframe in WordPress/Elementor.
  • Engineered multi-scene GSAP ScrollTrigger animations, a guided breathing sequence with audio synchronization, a dynamic day/night sky cycle and parallax cloud layers.
  • Deployed on Vercel with CI/CD via GitHub; implemented Lenis smooth scroll synchronized with the GSAP ticker.
Next.jsGSAPScrollTriggerLenisWordPressVercelTypeScript
aguxtin.com ↗
02Feb 2026 – Present

LanguageLine Solutions

Bilingual Interpreter (EN/ES)

Remote

  • Real-time communication facilitation for medical, legal and financial sectors via Teleperformance.
  • Consecutive interpretation with technical precision and cultural mediation.
  • Compliance with complex terminology under HIPAA and PCI regulations.
InterpretationHIPAAPCICultural mediation
03Feb 2026 – Present

KetBia

Web Systems & Digital Infrastructure Lead

La Merced, Junín, Perú · Hybrid

  • Led KetBia's digital transformation: full-stack web development, systems architecture and payment gateway integration.
  • Optimized organic positioning through technical SEO and managed the social media strategy, landing a coherent brand identity.
  • Built a scalable platform for commercializing fitness services.
ReactNode.jsPaymentsTechnical SEOIONOS
ketbia.com ↗
04Nov 2025 – Present

Cernext

Co-founder & CEO

Perú · Remote

  • Founded and lead a full-service digital agency delivering web development, SEO, digital advertising, ERP/CRM systems and AI chat automation.
  • Built the company platform with Next.js 16, React 19, Supabase, Tailwind CSS v4 and Vercel; architected multi-language routing and contact automation via Nodemailer.
  • Drove client acquisition, service delivery across 5 verticals and brand positioning in the Peruvian market.
Next.js 16SupabaseTailwind v4Meta CAPIGoogle AdsAI Chatbots
cernextec.com ↗
05Dec 2025 – Present

Barón Club

Web Developer & Paid Media Strategist

Valencia, España · Remote

  • Collaborated with the team to develop baronclub.es and its advertising on Google and Meta.
  • Engineered a custom WordPress reservation plugin using the Telegram Bot API and SMTP for automated management.
WordPressPHPTelegram APISMTPGoogle Ads
baronclub.es ↗
06Oct 2025 – Feb 2026

Nordstrom

Customer Service Representative

United States · Remote

  • Full-time multichannel support for Nordstrom.com international clients.
  • Incident resolution, e-commerce operations and customer relations at scale.
E-commerceCustomer relationsIncident resolution
07Aug 2025 – Oct 2025

Zent Piper

Senior Frontend Developer

Lima, Perú · Hybrid

  • Led the complete frontend development of the official website, deployed on Vercel with a custom domain configured via Cloudflare.
  • Handled full web development and Google SEO simultaneously while onboarding the first client (Cegrisa) and completing the first stage of their site.
ReactJavaScriptSEOVercelCloudflare
zentpiper.com ↗
08Jun 2025 – Jul 2025

El Hada Artesana

Frontend Developer

Lima, Perú · Remote

  • Developed the landing page for a local artisan business.
  • Applied agile methodologies within a collaborative team environment.
ReactSASSJavaScriptAgile
09Mar 2025 – Present

MaxGrind

Mobile Applications Developer

La Merced, Junín, Perú · On-site

  • Created the mobile app with Expo and the database with Supabase — a fitness tracking application, mainly for gym use.
React NativeExpoSupabasePostgreSQL
maxgrind.app/es ↗
10Jun 2024 – Aug 2024

Majanayim Sport

Fitness Coach & Integral Wellness Advisor

Huancayo, Junín, Perú · On-site

  • 360° fitness specialist combining high-performance training, strategic nutritional planning and exceptional client experience.
  • Boosted members' physical results through personalized programs and constant lifestyle support.
CoachingSports coachingNutrition planning
04 — Projects

Selected work.

Everything here is live, or was built end to end by me.

Aguxtin — Frontend Developer
01 / 08
Frontend Developer2026

Aguxtin

An immersive scrollytelling landing page for a conscious design brand. Multi-scene GSAP ScrollTrigger animations, a guided breathing sequence synchronized with audio, a dynamic day/night sky cycle and parallax clouds — embedded in WordPress/Elementor through a full-viewport iframe.

  • Next.js
  • GSAP
  • Lenis
  • WordPress
  • Vercel
  • SEO
Visit site↗
Cernext — Co-founder & CEO · Full Stack
02 / 08
Co-founder & CEO · Full Stack2025

Cernext

The platform of my own digital agency. Next.js 16 App Router with React 19, Supabase, Tailwind CSS v4 and Nodemailer, with fully separate ES/EN route trees, per-locale slugs, an AI chat widget and dual Meta Pixel + Conversions API tracking.

  • Next.js 16
  • React 19
  • Supabase
  • Tailwind v4
  • Meta CAPI
  • SEO
Visit site↗
Tayoton Fest — Web Development · Cernext
03 / 08
Web Development · Cernext2026

Tayoton Fest

+564%organic traffic

Website and ticketing flow for a music festival, built and positioned by Cernext. Organic traffic to the site grew by 564% after launch.

  • Web development
  • SEO
  • Ticketing
  • Google Ads
Visit site↗
KetBia — Web Systems & Infrastructure Lead
04 / 08
Web Systems & Infrastructure Lead2026

KetBia

A full-stack fitness and coaching platform: React frontend, Node.js services, RESTful payment gateway integration, technical SEO and deployment infrastructure on IONOS with SSL and custom domain.

  • React
  • Node.js
  • Payments
  • Technical SEO
  • IONOS
Visit site↗
Barón Club — Web Developer & Paid Media
05 / 08
Web Developer & Paid Media2025

Barón Club

x10reach growth

Premium barbershop site in Valencia, Spain, plus a custom WordPress reservation plugin I wrote in PHP that orchestrates the Telegram Bot API and SMTP to automate bookings end to end. Google and Meta Ads managed alongside.

  • WordPress
  • PHP
  • Telegram API
  • SMTP
  • Google Ads
Visit site↗
Zent Piper — Senior Frontend Developer
06 / 08
Senior Frontend Developer2025

Zent Piper

The official site for a web agency — complete frontend build, Vercel deployment and a custom domain configured through Cloudflare, with Google SEO handled in parallel to the first client onboarding.

  • React
  • Vercel
  • Cloudflare
  • SEO
Visit site↗
MaXGrind — Mobile Applications Developer
07 / 08Work in progress
Mobile Applications Developer2025

MaXGrind

A gym-focused fitness tracking app. Originally a web build, now migrating to React Native with Expo and a Supabase (PostgreSQL) backend.

  • React Native
  • Expo
  • Supabase
  • PostgreSQL
Visit site↗
El Hada Artesana — Frontend Developer
08 / 08
Frontend Developer2025

El Hada Artesana

Landing page for a local artisan business — responsive React frontend with SASS and a component-based architecture, delivered in an agile team setup.

  • React
  • SASS
  • JavaScript
  • Agile

Private client work

05 — Credentials

Studies, certifications and languages.

Education

B.S. in Systems Engineering and Computer Science

Universidad Continental

Currently in progress — Lima, Perú.

Mar 2023 – Present

Full-Stack Web Development Career

Coderhouse

106 hours across Web Development, JavaScript, React and three Backend courses.

Apr 2025 – Jun 2026

Certifications

9

Languages

Spanish100%

Native / Bilingual

English100%

Native / Bilingual

Portuguese45%

Limited Working

Japanese20%

Elementary

06 — Contact

Let's build something.

Open to full stack roles, freelance projects and agency collaborations. The fastest way to reach me is email.

Email

bclaydrius@gmail.com

Phone

+51 988 490 319

Based in Lima, Perú

Elsewhere