07CV

Lima, Perú — Available for work

Barclay Leach

Trade & Channel Marketing · Full Stack Developer · Founder at Cernext · Native English (C2)

I grow channels — social audiences, acquisition funnels, paid media — and build the production systems that carry them: Next.js platforms, payment gateways, AI chat automation.

About

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

Portrait of Barclay Leach

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

Alongside that, I manage the channels that turn traffic into customers — growing social accounts from zero, running paid campaigns on Google and Meta, and designing the acquisition funnels that connect a bio link to a sale.

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'm a native English speaker, and I work in both English and Spanish.

8+
Live products shipped
5
Years writing code
4
Languages spoken
9
Certifications
Stack

Tools, in production.

Most days: JavaScript, TypeScript and PHP for logic, SQL underneath. React and Next.js carry the front end, GSAP takes over when a page needs to move, and Tailwind handles the rest. On the back end it's Node.js and Express talking to PostgreSQL or Supabase, with React Native and Expo for anything that needs to run on a phone.

Everything ships through Git and GitHub, deployed on Vercel or Cloudflare — WordPress and IONOS for clients who need that instead. I also handle the layer most developers skip: technical SEO, Google and Meta Ads with the Conversions API, growing Instagram and TikTok audiences and designing the funnels that turn them into a CTA, WhatsApp and Telegram automation through ManyChat, and increasingly, AI chat automation and ERP/CRM systems built with Claude Code.

Experience

Where I've been building.

01Sep 2026 – Present

IDI Adonai Consultoría

Marketing & Software Lead

Perú · Remote

  • Designed, built and launched the company's new web platform — replacing its WordPress site with an in-house React 19, TypeScript and React Router v7 build with static prerendering — and built its CRM in-house.
  • Optimize lead capture across the web and social media (LinkedIn, Instagram, Facebook, TikTok and YouTube), including a B2B funnel with a two-step qualification form, contextual links in every section, and lead delivery to Telegram and corporate email.
  • Maintain the company's software and lead its technology. Deployment is automated with GitHub Actions: every push to main ships to production, behind a guard that blocks secrets from the bundle.
  • Promoted from B2B Sales & Systems Engineering Advisor to Marketing & Software Lead, owning the company's technology and AI platforms and technology consulting.

React · TypeScript · GSAP · Tailwind CSS · PHP · SEO · CRM · Social Media

idiadonai.com ↗
02Feb 2026 – Present

KetBia

Web Systems & Channel Growth Lead

La Merced, Junín, Perú · Hybrid

  • Grew and managed KetBia's Instagram to 55K+ followers, designing the CTA flow — bio to landing page to WhatsApp — that converts that audience into customers for KetBia's UGC and video editing services.
  • Led KetBia's digital transformation: full-stack web development, systems architecture and payment gateway integration.
  • Optimized organic positioning through technical SEO, reinforcing a coherent brand identity across the platform.
  • Built a scalable platform for commercializing fitness services.

React · Node.js · Payments · SEO · Social Media

ketbia.com ↗
03Nov 2025 – Present

Cernext

Founder

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 · Supabase · Tailwind CSS · Meta CAPI · Google Ads · AI Chatbots · Claude Code

cernextec.com ↗
04Jul 2026 – Present

L & F Golosinas

Web, SEO & Social Media Manager

San Ramón, Chanchamayo, Perú · Remote

  • Built and launched lyfgolosinas.com end to end.
  • Implemented local SEO targeting searches across the Junín region.
  • Manage Instagram, TikTok and Facebook for the business, from July 2026 to present.

Next.js · Tailwind CSS · SEO · Instagram · TikTok · Facebook

lyfgolosinas.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.

WordPress · PHP · Telegram API · Google Ads · Meta Ads

baronclub.es ↗
06May 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.js · GSAP · WordPress · TypeScript

aguxtin.com ↗
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.

React · JavaScript · SEO

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.

React · SASS · JavaScript · Agile

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 Native · Expo · Supabase · PostgreSQL

maxgrind.app/es ↗
10Feb 2026 – Oct 2026

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.

Interpretation · C2 English · HIPAA · PCI · Cultural mediation

11Oct 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-commerce · Customer relations · Incident resolution

12Jun 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.

Coaching · Sports coaching · Nutrition planning

Projects

Selected work.

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

01 / 11
Marketing & Software Lead · Full Stack2026

IDI Adonai

A full rebuild of the website for a consultancy in hyperspectral satellite observation, subsurface detection and high-altitude drones. React 19 and TypeScript with prerendered React Router v7, Tailwind CSS v4, Motion, GSAP ScrollTrigger and Lenis animation, a two-step B2B form delivering leads to Telegram and email, and Playwright + axe testing.

React · TypeScript · GSAP · Tailwind CSS · SEO

Visit site↗
Aguxtin — Frontend Developer
02 / 11
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 · WordPress · SEO

Visit site↗
03 / 11
Founder · 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 · React · Supabase · Tailwind CSS · Meta CAPI · SEO

Visit site↗
04 / 11
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.

SEO · Ticketing · Google Ads

Visit site↗
05 / 11
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 · SEO

Visit site↗
06 / 11
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 · Google Ads · Meta Ads

Visit site↗
07 / 11
Senior Frontend Developer2025

Cernext

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 · SEO

Visit site↗
08 / 11
Landing page · Web development2026

L & F Golosinas

Landing page for a sweet shop in San Ramón, Chanchamayo. Wholesale and retail catalogue, conversion handled entirely through WhatsApp, and local SEO built around searches in the Junín region.

Next.js · Tailwind CSS · SEO · WhatsApp

Visit site↗
MaXGrind — Mobile Applications Developer
09 / 11Work 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↗
10 / 11
Frontend Developer2026

JHEF BARBERZ

Brand site for a Peruvian barbershop. Next.js 15 App Router with TypeScript, Tailwind CSS v4, Framer Motion and Lenis inertia scroll — fully static, no CMS, all content in a single typed source file. Custom brand components (an animated scissor divider, a spinning barber pole, a magnetic button, a scroll-reversing marquee), full SEO metadata with BarberShop JSON-LD, and WhatsApp booking with live open/closed detection.

Next.js · TypeScript · Tailwind CSS · Framer Motion · SEO

Visit site↗
El Hada Artesana — Frontend Developer
11 / 11
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

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 (C2)

Portuguese45%

Limited Working

Japanese20%

Elementary

Contact

Let's build something.

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

View CV →