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Joao Vitor Martins - Senior Software Engineer

Joao Vitor Martins

Senior Software Engineer | Backend & Distributed Systems

Email:
paulino.joaovitor@yahoo.com.br
Location:
Melbourne, Australia
Focus:
Financial-grade systems, microservices, reliability, cloud-native architectures
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About

Senior Software Engineer with 7+ years of experience designing, building, and operating financial-grade backend systems across banking, fintech, ERP, logistics, retail, and SaaS environments.

Strong expertise in .NET, distributed systems, microservices, and event-driven architectures, with experience handling tens of billions in monthly transactions while operating under strict regulatory, availability, and compliance requirements.

I deliver end-to-end: architecture, implementation, production readiness, incident response, and continuous improvements. I have acted as a technical owner for critical systems, led incident war rooms, mentored engineers, and partnered with product and architecture teams to ship core business capabilities.

Technical toolkit includes C#/.NET, microservices, Kafka/RabbitMQ/Azure Service Bus, REST/GraphQL/gRPC, PostgreSQL/MongoDB/Redis, and observability via Dynatrace/Datadog/ELK.

Technical Skills

Backend & Architecture

C# .NET ASP.NET Core Microservices Distributed Systems Event-Driven Architecture Domain-Driven Design Clean Architecture CQRS REST GraphQL gRPC

Cloud & Infrastructure

AWS Lambda S3 SQS SES RDS (PostgreSQL) Azure Azure Functions Service Bus Kubernetes Docker Terraform CI/CD

Data & Messaging

PostgreSQL MongoDB MySQL SQL Server Redis Kafka ActiveMQ RabbitMQ Azure Service Bus IBM MQ

Observability & Quality

Dynatrace Datadog ELK Incident Management Performance Engineering Testing (Unit/Integration/Load/Stress)

Highlights

Reliability & Scale

  • BRL 30B+ monthly transaction volume
  • 99.90%+ availability in regulated banking
  • War rooms, RCA, post-mortems, production recovery

Leadership & Ownership

  • Technical owner for PIX/TED critical systems
  • Feature leader (Salary Portability)
  • Mentorship, onboarding buddy, technical interviews

Modern Backend Toolkit

  • .NET, microservices, event-driven platforms
  • REST/GraphQL/gRPC integrations
  • Observability with Dynatrace/Datadog/ELK

Cloud-Native

  • AWS Lambda/S3/SQS/SES/RDS
  • Azure Functions/Service Bus
  • Terraform-first infrastructure

Professional Experience

XP Inc. (NASDAQ: XP)

Senior Software Engineer

Apr 2023 – Sep 2025

Investment and digital banking platform serving millions across Latin America.

  • Designed, maintained, and operated backend systems processing BRL 30B+ per month with 99.90%+ availability.
  • Technical owner for critical transfer systems (PIX, TED), ensuring reliability, scalability, and fault tolerance.
  • Led architecture and delivery of core banking features within the Digital Account platform.
  • Operated in a regulated environment with strict quality, security, and compliance standards.
  • Led war rooms, root cause analysis, and recovery plans for production incidents.
  • Mentored engineers (buddy onboarding), performed code reviews, pairing sessions, and technical interviews.
  • Owned documentation for TED processing within XP’s tech ecosystem.

Key Achievements

  • Led the Overdraft Product from concept to production, enabling 60,000+ new accounts.
  • Improved PIX reliability, reducing latency/downtime client contacts by 60%+.
  • Built telemetry and alerts for TED via Dynatrace, reducing incident-related client contacts by 90%+.
  • Helped launch the International Account enabling USD transfers and reducing third-party dependency.
  • Built a TED request tool integrated with XP’s chatbot using ChatGPT to improve UX and reduce manual support.

XP Inc. (NASDAQ: XP)

Mid-Level Software Engineer

Aug 2021 – Apr 2023
  • Feature leader for Salary Portability: end-to-end ownership from modernization to functional expansion.
  • Modernized legacy services while expanding features that boosted demand deposits (DAV) for XP Bank.
  • Led onboarding and technical training sessions for new engineers.
  • Built operational and support dashboards using Datadog for Salary Portability and TED/TEF platforms.

XP Inc. (NASDAQ: XP)

Junior Software Engineer

Jan 2021 – Aug 2021
  • Participated in the design and development of the TED transfer architecture and services in under 5 months.
  • Contributed to one of XP’s most critical systems: balance transfers between investment and digital accounts.
  • Applied modern architectural patterns focused on scalability, performance, and maintainability.
  • TED system has processed BRL 40B+ in financial transfers since launch.

Hypesoft

Software Engineer (Contract)

Jan 2023 – Dec 2023

Custom digital solutions for enterprise clients and startups (ERP, fintech, white-label).

  • GWM Brazil: Contributed to the first ERP system, improving inventory, logistics, and financial workflows.
  • Banco Carrefour: Built cashback platform integrated with mobile ecosystem, with secure high-throughput APIs.
  • IAudit: Designed a high-volume webhook management system using Azure Service Bus, retry policies, DLQ, and observability.

Linx (Stone Co., NASDAQ: STNE)

Mid-Level Software Engineer

Mar 2020 – Jan 2021

Brazil’s largest retail management software company (ERP, POS, e-commerce, CRM, payments).

  • Maintenance, improvements, and reengineering of Linx UX ERP (shopping vertical).
  • Participated in pilot initiatives involving microservices and SmartSales prototype within R&D.
  • Supported modernization of legacy systems toward modular and scalable architectures.

Veget

Software Engineer

Mar 2020 – Aug 2020

Agri-tech marketplace connecting rural producers directly to consumers.

  • Designed initial backend architecture using cloud-native principles focused on scalability and maintainability.
  • Applied CQRS and Domain-Driven Design (DDD) to model core domains and separate reads/writes.
  • Contributed to a platform that reached BRL 300,000+ monthly revenue in a short period.
  • Worked closely with frontend teams to integrate with React-based user interfaces.

Sinctec Sistemas / Associatec

Software Developer

Jun 2019 – Mar 2020

Logistics and SaaS ERP platforms (Associatec: 200,000+ users).

  • Associatec: SaaS ERP platform for third-sector organizations, serving 200,000+ users.
  • SincLog: TMS logistics/fleet system later acquired by Magazine Luiza.
  • Delivered features, performance improvements, bug fixes; participated in code reviews, QA, and deployments.
  • Promoted from intern to junior developer based on technical performance and ownership.

True Blue Labs Pty Ltd

Founder & Senior Software Engineer

2025 – Present

Software studio focused on building SaaS products and digital platforms.

  • Founder and lead engineer responsible for architecture, backend development, and infrastructure.
  • Built Invoicefy, a guest-first invoicing platform (Flutter, .NET, AWS Lambda, PostgreSQL, S3, SQS, SES).
  • Designed systems emphasizing immutability, auditability, and financial correctness.
  • Infrastructure built with a Terraform-first approach.

Education

Graduate Diploma — Software Architecture

FIAP — Brazil

2023 – 2024

Microservices, containerization, serverless applications, secure development, and cloud-native architecture standards (hands-on projects).

Bachelor's Degree — Information Systems

IMPACTA College of Technology — Brazil

2018 – 2021

Software engineering fundamentals, systems design, data management, entrepreneurship basics, and applied computing.

Languages

Portuguese

Native

English

Professional Working Proficiency