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Gabriel Martins

@gabrielmartins2

Senior backend engineer at PayPal building Java and Node.js GraphQL services for order tracking handling billions of requests per month.

Brazil

Message

At PayPal, I build and optimize Java and Node.js GraphQL services for global order tracking and package visibility, handling billions of requests per month. I analyze production traces and profile algorithms to improve response times and system resilience.

At IBM, I designed and built Go, Node.js, TypeScript, and Spring Boot microservices and APIs for financial applications. I reduced request latency by 50% and implemented security controls and OpenTelemetry observability across production services.

At SulAmerica, I led the architecture and delivery of cloud-native Go and Java microservices on GCP, including authentication, MFA, and security remediation. Earlier, I designed and built Turno Inverso’s mobile-first marketplace platform and led technical direction for its engineers.

Experience

Work history, roles, and key accomplishments

Current

Sr. Software Engineer

Current

PayPal

Nov 2024 - Present (1 year 11 months)

Senior backend engineer on global, high-scale distributed systems. Built and optimized Java and Node.js GraphQL services for order tracking and package visibility, handling billions of requests per month.

Java NodeJS GraphQL Kubernetes Kafka Distributed Systems Microservices Observability Incident Response

Staff Software Engineer, Tech Lead

SulAmerica

Apr 2024 - Nov 2024 (7 months)

Led architecture and delivery of cloud-native Go and Java microservices with Pub/Sub driven asynchronous communication on GCP. Owned platform decisions for authentication, MFA, and security remediation.

Go Java GCP Pub Sub Microservices Authentication MFA Security

Sr. Software Application Developer

IBM

Apr 2022 - Apr 2024 (2 years)

Senior backend engineer on high-demand financial applications. Designed and built microservices and BFFs in Go, Node.js, TypeScript, and Spring Boot, and owned cloud delivery across IBM Cloud and AWS.

Go NodeJS TypeScript Spring Boot REST GraphQL IBM Cloud AWS PostgreSQL MongoDB Redis S3 RabbitMQ OpenTelemetry OWASP SSO OIDC

Full Stack Engineer (Consultant)

GDM Tech

Apr 2021 - Apr 2022 (1 year)

Built and deployed backend and full-stack services on AWS and Azure using Node.js, TypeScript, Docker, and CI/CD. Delivered data engineering with Python and Apache Spark across two client projects.

NodeJS TypeScript Docker CI CD REST GraphQL NoSQL SQL Python Apache Spark AWS Azure

Sr. Back-end Developer

Teky

Oct 2021 - Mar 2022 (5 months)

Built GraphQL and REST APIs with Node.js and TypeScript, integrating payment gateways and AWS services. Acted as team lead on group projects, defining technical direction and best practices.

NodeJS TypeScript GraphQL REST AWS DynamoDB Elasticsearch Amazon SQS MySQL Payment Gateways

Tech Manager

Turno Inverso

Mar 2021 - Feb 2022 (11 months)

Designed and built a mobile-first, cloud-based marketplace platform from scratch, owning the software architecture and system design end to end. Led technical direction for frontend and backend engineers.

Software Architecture System Design Cloud Computing Mobile Leadership

Sr. Data Engineer, BI Analyst

Plataforma A

Feb 2017 - Mar 2021 (4 years 1 month)

Built and operated end-to-end data pipelines and cloud integrations on AWS and Azure using Python. Partnered with backend engineering teams to support analytics and operational reporting.

Python AWS Azure Data Pipelines ETL BIツール Analytics

Data Analyst

Mada Engenharia

Sep 2014 - Dec 2016 (2 years 3 months)

Extracted, organized, and analyzed business data, building reports and statistical models to support decision-making.

Data Analysis Reporting Statistical Modeling

Trainee, Engineering

GKN Driveline

Dec 2013 - Sep 2014 (9 months)

Supported engineering analysis and design alongside senior engineers, and led statistical approaches to track and improve the overall manufacturing process.

Engineering Analysis Statistical Analysis Manufacturing