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Pablo Koll.

Backend Software Engineer

// Focused on integrations, distributed workflows, and reliable transactional systems. I use AI tooling pragmatically — to validate faster, prototype ideas, and cut through complexity.

available for freelance

Featured Projects

// Selected work and side projects

01 freelance

Asset Image Scraper

Node.js/TypeScript service that renders personalized product images on a dynamic canvas via Puppeteer, captures the output as a screenshot, and serves it as an optimized image. Built as a headless scraper-style pipeline with browser pool management for concurrent requests and smart caching.

Node.jsTypeScriptPuppeteerDockerAzure

02 freelance

Kit Customization Widget

Interactive widget for Shopify that lets customers personalize products in real time. Features dynamic filtering by multiple attributes, live inventory checks, and a canvas-based preview with curved text, custom fonts, and multi-color effects.

ShopifyJavaScriptCanvasGraphQL

Work Experience

// Recent positions and achievements

Backend Engineer | Platform & Integrations

// Tendam

Dec 2024 - Present

Corporate

Worked on payment gateway integrations (Adyen, Redsys, Cybersource) for a platform processing ~10k daily events across 12 international brands
Contributed to OMS migration covering the full order lifecycle: orders, invoices, returns, and exchanges across ~80 countries
Extended and maintained billing and invoicing workflows aligned with country-specific tax requirements

Full Stack Engineer | Integration Lead

// Webmefy

Jul 2024 - Dec 2024

Agency

Built integrations between Shopify Plus, ERPs, and third-party services using REST and GraphQL APIs
Designed and deployed backend services and infrastructure on AWS for client ecommerce solutions
Worked directly with clients to define requirements, scope integrations, and deliver production-ready solutions

Backend Engineer | Systems Integration

// Balloon Group

Jul 2022 - Jul 2024

Startup

Took over and extended a multi-tenant middleware orchestrating order, invoice, stock, pricing, and catalog flows across Magento, VTEX, ERP, and carrier systems for 4 clients
Maintained a bidirectional Magento–Salesforce synchronization platform for Abbott across 8 Latin American countries, handling catalog, order, and CRM data flows
Implemented async processing pipelines with Redis and BullMQ for orchestration, notifications, webhook delivery, and background jobs

Full Stack Developer

// Balloon Group

Nov 2021 - Jul 2022

Startup

Developed Vue.js landing pages for Toyota (Hino Trucks) optimized for SEO and performance
Built React-based UI components and admin features for client web platforms
Maintained and customized Laravel and WordPress CMS solutions across client projects

Current Focus

// What I'm learning and working on

Always learning outside of what the day-to-day demands — currently deepening my expertise in Go, using Vim as my primary interface, managing knowledge with Obsidian, and exploring AI tools pragmatically across development workflows.

Let's talk to build something good.

// Contact to drink a coffee.

Available for freelance and remote work. I enjoy working with a clear plan, helping teams make sharp technical decisions, and building backend systems from scratch — architecture, deployment, and long-term maintainability.

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