Gustavo Oliveira

Software Engineer

Gustavo Oliveira

Senior Elixir Engineer | Phoenix · OTP · Distributed Systems · AI-Assisted Development

São Paulo, Brazil (Remote — Americas / Europe)

About

Senior Elixir Engineer with 11+ years of experience building fault-tolerant, high-throughput distributed systems across logistics, fintech, and SaaS. Deep expertise in Elixir/OTP, Phoenix, LiveView, and real-time asynchronous architectures. Proven track record shipping systems that process millions of records and hundreds of thousands of transactions under real production load.

Passionate about AI-assisted engineering: published author on LLM-powered development workflows, and hands-on practitioner integrating AI tooling (Claude, Cursor, MCP servers) into team development cycles to multiply engineering output.

Selected impact: reduced data ingestion from ~5 hours to under 10 minutes processing ~1M records per run · built Stripe payment system handling 200,000+ transactions/month · architected distributed systems powering ~100,000 deliveries/day across Brazil, Mexico, and Colombia · implemented Tax ID compliance across 10+ international markets enabling global merchant onboarding.

Bachelor's Degree, Internet Systems · Fatec Carapicuiba (2012–2014)
Week Technology — AngularJs

Experience

Outcomes and results across 11+ years — scale, cost savings, and better product and team performance.

  • Senior Software Engineer · Stord

    Apr 2025 — Present

    United States

    • Built an AI-powered on-call assistant integrating the live codebase with MCP servers for Freshdesk, Atlassian, Datadog, and Kafka — enabling engineers to resolve incidents in seconds without context switching
    • Coached the team on Claude plan mode, structured prompting, and AI plugin workflows — accelerating feature design cycles
    • Engineered combine/separate shipment logic handling ~100,000 daily orders, preventing incorrect fulfilled statuses at scale
    • Implemented Tax ID support across 10+ markets (CPF, CNPJ, EORI, VAT, RUT, RFC, CUIT) — enabling international merchant onboarding
    • Built shipping A/B testing framework comparing price vs. delivery speed to drive data-driven decisions at scale
    • Reduced support tickets ~80/incident cycle via real-time freight pallet visualization feature
    Elixir Phoenix Go React Oban PostgreSQL Kafka AWS GCP Datadog Claude Code Cursor MCP
  • Senior / Lead Software Engineer · Lolo

    Aug 2023 — May 2025

    United States

    • Architected the full backend from scratch with Elixir, Phoenix, and LiveView — supporting ~800 senders and 50+ partners
    • Built Stripe payment system handling 200,000+ transactions/month with subscription billing, automated retries, and failure recovery
    • Designed Oban-based pipelines delivering 400,000+ emails and SMS per week, fully decoupled and resilient to third-party downtime
    • Led team of 5 in adopting TDD, clean architecture, and LiveView patterns — reducing onboarding from 1 week to 1 hour
    • Introduced GitHub Copilot and AI content generation across the engineering team to accelerate delivery velocity
    Elixir Phoenix LiveView Oban Stripe SendGrid PostgreSQL GitHub Copilot
  • Senior Software Engineer · Clarus R+D

    May 2021 — May 2023

    Columbus, Ohio

    • Built real-time W2 PDF ingestion pipeline (S3 + parsing API + PostgreSQL) — cutting per-client processing from days to seconds, handling ~1,000 W2s per client per cycle
    • Contributed to a platform enabling clients to claim over $100M in R&D tax credits annually
    • Eliminated manual deployments with CI/CD pipeline via GitHub Actions and AWS EKS
    Elixir React LiveView GitHub Actions AWS EKS S3 PostgreSQL
  • Senior Software Engineer · Zubale

    Jul 2020 — Jul 2021

    United States

    • Optimized Elixir data ingestion API to process ~1M records in under 10 minutes — down from ~5 hours — eliminating daily bottlenecks and weekend overtime
    • Architected distributed systems with Kafka and GraphQL powering ~100,000 deliveries/day across Brazil, Mexico, and Colombia
    • Built geolocation-enabled mobile backend for contractor order fulfillment across 3 countries
    Elixir GraphQL Kafka React React Native MongoDB PostgreSQL Kubernetes
  • Lead Software Engineer · HDI Seguros

    Jul 2019 — Jul 2020

    São Paulo, Brazil

    • Developed production-grade RESTful APIs (Richardson Level 2) as part of company-wide Digital Modernization Strategy
    • Engineered the Open Insurance API in compliance with SUSEP's framework — among the first insurers in Brazil to meet requirements
    • Replaced legacy Progress Database with PostgreSQL and MongoDB; containerized services with Docker and Kubernetes
    Java 8 Spring Boot Go PostgreSQL MongoDB Docker Kubernetes
  • Senior Software Development Engineer · TOTVS

    Oct 2018 — Jun 2019

    São Paulo, Brazil

    • Led migration from monolithic architecture to microservices, increasing deploy frequency and enabling faster innovation
    Java Spring Boot Microservices Docker
  • Senior Software Engineer · Concrete Solutions

    Jan 2016 — Oct 2018

    São Paulo, Brazil

    • Built REST APIs and business tools for enterprise clients using Java 8 and Spring Boot
    • Delivered BDD/Cucumber automated test suites for mobile applications
    • Worked across multiple client projects delivering microservices architectures with Spring Cloud
    Java 8 Spring Boot Spring Cloud React Angular Oracle Hibernate BDD/Cucumber AWS
  • Software Engineer · CWI Software

    Jan 2015 — Dec 2015

    São Paulo, Brazil

    • Integrated enterprise systems via JMS and REST web services; full-stack development with Spring, Hibernate, Angular
    Java Spring Hibernate JMS Angular
  • Software Engineer Intern · Ericsson Inovação

    Jan 2013 — Dec 2014

    São Paulo, Brazil

    • Built CI pipelines with Jenkins; developed inventory management system with Java and JSF
    Java JSF Jenkins HTML

Portfolio

Coming soon

Selected projects and case studies will be linked here.

Chat with my Digital Twin

Ask anything about my career and impact. I'll answer as Gustavo's digital twin.

Let's connect

Open to collaboration, speaking, and impactful engineering discussions.