MH
A-00About

Engineering at the edge of enterprise systems.

I'm a backend software engineer based in São Paulo, Brazil. I specialize in Java backend systems, enterprise integrations, and fiscal infrastructure — the kind of work that runs quietly behind large organizations, rarely visible but always critical.

Most of my professional work has lived inside regulated environments: tax-reform compliance systems (IBS, CBS, IS), SAP integrations, MasterSAF API workflows, and Oracle-based data pipelines. I've built internal tooling that replaced manual processes, worked on systems that process high volumes of NF-e, and contributed to architecture where legacy and modern systems coexist.

I think good backend engineering is about constraints, correctness and clarity. Outside enterprise work I build modern web interfaces and REST APIs with Next.js and TypeScript — systems that are technically sound and precise in equal measure.

~/profileONLINE
location
São Paulo, Brazil
experience
4+ years
domain
Backend · Integrations
languages
Java · Python · TS
database
Oracle DB · SQL
status
Open to roles
A-01Trace

Experience & trajectory

A career trace through enterprise, fiscal and backend systems. Expand any node for the detail.

  • Development, maintenance and evolution of critical business systems combining backend engineering, fiscal integration and data processing — in production environments where downtime has direct financial impact.

    • Backend implementation for Brazil’s 2024 tax reform (IBS / CBS / IS)
    • SAP ↔ Oracle integration and daily financial reconciliation
    • Internal tooling that replaced manual fiscal correction processes
    • Oracle query optimization on critical financial reports
    JavaSpring BootOracle DBPL/SQLPythonSAPMasterSAFNF-e

  • Bachelor’s degree in Software Engineering.

A-02Stack

Technical depth by domain

Grouped by where and how each tool is used — not by a made-up percentage.

Backend

01

Primary — services & business logic

Java 11Spring Boot 3PythonNode.jsTypeScript

Enterprise Integration

02

Systems that were never meant to talk

SAP RFCMasterSAF APINF-e / SEFAZREST APIsXML / DOM

Data

03

Persistence, pipelines & reporting

Oracle DBPL/SQLSQLETLPower BI

Infrastructure

04

Build, run & version

GitDockerIntelliJPostmanVS Code

Frontend

05

Product surfaces & tooling UIs

ReactNext.jsTailwindCSSFramer Motion

Engineering Practices

06

How the work stays reliable

Validation-firstObservabilityIdempotencyAudit trailsLegacy modernization
04 · Open a connection

Let's build something reliable.

Available for backend and software engineering roles — Java, enterprise integrations, and systems that have to stay up.

mattenglish2177@gmail.com
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