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guilherme jacobus

@guilhermejacobus

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Senior full-stack engineer building scalable systems with AI-powered automation.

Netherlands

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What I'm looking for

I’m looking to own end-to-end full stack work on high-traffic products, where I can ship fast in ambiguity and apply LLM/AI automation in production—paired with strong engineering standards and real measurable impact.

I’m a Senior Full Stack Software Engineer with 6+ years of experience building high-performance, scalable systems across the stack. I’m hands-on with LLMs, AI APIs, and agent-style workflows in production, and I like owning and shipping end-to-end solutions fast in ambiguous, high-traffic environments.

At Trade Me, I own high-traffic SEO systems focused on scalability, AI-powered automation, and measurable organic growth. I designed, built, and shipped an internal LLM-powered automation tool using the Claude API, reducing a cross-functional process from roughly one week to minutes with no engineering involvement after launch.

At PATtech, I owned engineering initiatives end to end across data ingestion, reconciliation, and frontend systems. I architected and built a fan-out/fan-in ingestion system on Azure Functions and Service Bus, cutting CSV processing time from 17 minutes to 2 seconds and reducing compute costs by 75%—and I rebuilt the web portal using Next.js and Node.js to reduce load by up to 90% during heavy operations.

Earlier roles strengthened my breadth: I migrated a legacy Java permission system to modular Node.js microservices at Mooven, and I delivered Ethereum smart contract integrations and event-driven processing at PowerFinance. I bring that same ownership mindset everywhere, from planning through release, backed by a BSc in Computer Science.

Experience

Work history, roles, and key accomplishments

Current

Full Stack Senior Software Engineer

Current

Trade Me

Oct 2025 - Present (8 months)

Owned high-traffic SEO systems, designing an internal LLM-powered Claude API automation tool that cut a cross-functional workflow from ~1 week to minutes. Led SEO-critical feature development across Angular and .NET services and improved Core Web Vitals via SSR, caching, and rendering optimizations.

LLM Claude Angular .NET API Development Observability Go

Full Stack Senior Software Engineer

Pattech Ltd

Aug 2024 - Oct 2025 (1 year 2 months)

Architected and built an Azure Functions + Service Bus ingestion system that reduced CSV processing time from 17 minutes to 2 seconds and cut compute costs by 75%. Rebuilt a data portal with Next.js/Node.js and deployed Python-based pipelines feeding Snowflake, reducing web and database load by up to 90% during heavy operations.

Azure Functions Data Ingestion Snowflake PostgreSQL Prisma Next.js Node Python Azure Blob Storage

Full Stack Intermediat Software Engineer

Mooven Ltd

Nov 2023 - Aug 2024 (9 months)

Migrated a legacy Java permission system to modular Node.js microservices using tRPC, retiring Java infrastructure and saving $1,000/month in platform costs. Built and delivered a self-service Virtual Messaging Sign feature that reduced internal support requests by 40% within weeks of launch.

Node TypeScript tRPC Microservices Migration React REST APIs

Full Stack Junior Software Engineer

PowerFinance

Mar 2022 - Nov 2023 (1 year 8 months)

Owned end-to-end Ethereum smart contract integrations, building Node.js microservices to ingest on-chain data and expose REST APIs to GraphQL frontends in an early-stage environment. Implemented event-driven async pipelines for real-time blockchain processing and built a shared React/MUI component library as an NPM package.

Smart Contracts Web3 Microservices Event Driven Architecture REST APIs GraphQL React NPM

Frontend Web Developer

Accelerate It Digital

Jan 2021 - Mar 2022 (1 year 2 months)

Developed React frontends and integrated AWS-based APIs for client web projects, supporting delivery from design through deployment. Built and maintained backend services and REST APIs using Next.js and Node.js while working in Agile/Scrum teams.

React Next.js Node AWS REST APIs Frontend Development Agile Scrum API Integration