Jonathan Peris — Software Engineer

Career system map·2008 — now

I build backend systems that can be understood, operated, and changed after they meet production traffic.

12+ years of production software, drawn as a line: 11 stations, one terminus. The colored lines are the threads that kept running through it. Pick a line to follow it.

Station Index

Newest first · tap a station on the map to jump here

Jul 2023— present
You are here
Jul 2023 — present
Derivative Path
Software Engineer·New York, US·Remote·Full-time
On the CAAR team, developing the General Ledger, Hedge Accounting, and Fiscal Calendar modules for the DerivativeEDGE platform, which manage billions in notional value.
12345
C# · .NET 8 · SQL Server · CQRS · Azure DevOps · Clean Architecture
Feb 2023— Jul 2023
Feb 2023 — Jul 2023
T-Systems do Brasil
Principal .NET Developer·São Bernardo do Campo, SP·Remote·Full-time
Technical lead for the platform and architecture migration of SGP Eletrônica, the ECU mapping and parameterization software for Mercedes-Benz trucks and buses.
123
C# · ASP.NET Core · Blazor · Entity Framework · Azure · SQL Server
Jun 2021— Feb 2023
Jun 2021 — Feb 2023
KnowFully Learning Group
Software Engineer·Radnor Township, PA, US·Remote·Full-time
Full-cycle development of the ExamReview platform across backend, infrastructure, and mobile. Built the CMS feeding the LMS for thousands of students, and the Admin platform, on Azure with microservices, CQRS, and full test coverage.
1234
C# · Azure · Microservices · CQRS · Xamarin · Azure DevOps
Jan 2021— Jun 2021
Jan 2021 — Jun 2021
XP Inc.
DevOps Engineer·Miami, FL, US·Remote·Full-time
International wire transfers between Brazil and the US, monitoring, and Azure infrastructure with .NET Core microservices using SAGA and message queues.
1234
Azure · .NET Core · Docker · SAGA Pattern · RabbitMQ · CI/CD
Sep 2018— Jan 2021
Sep 2018 — Jan 2021
T-Systems do Brasil
Principal .NET Developer·Dec 2019 — Jan 2021·São Bernardo do Campo, SP·Full-time
Led T-Atendo (helpdesk for Mercedes-Benz factory workers), Multi Manager (resource booking), and T-Entrego (corporate gift distribution) with .NET Core, Azure, and microservices, in Agile/Scrum. Technical lead of the team, guiding and mentoring the developers who reported to him.
Senior .NET Developer·Sep 2018 — Dec 2019·São Bernardo do Campo, SP·Full-time
Mileage control systems for Mercedes-Benz trucks, and institutional and intranet applications.
123
C# · .NET Core · Azure · Microservices · REST API · Scrum · .NET Framework · SQL Server · Azure DevOps · JavaScript · MVC
May 2017— Sep 2018
May 2017 — Sep 2018
UnitedHealth Group
.NET Developer·São Paulo area·Full-time
Hospital internal control applications and proofs of concept. 5A Attiva maintains Amil clinical systems.
12
C# · ASP.NET MVC · SQL Server · Entity Framework · Healthcare
Oct 2015— May 2017
Oct 2015 — May 2017
Leroy Merlin
.NET Developer·São Paulo area·Full-time
Second version of the label generation system for all stores, and the business operations management system, via SONDA.
12
C# · ASP.NET MVC · Angular · Web API · SQL Server
May 2013— Sep 2015
May 2013 — Sep 2015
Conecta Comercio e Serviços Ltda.
.NET Developer·São Paulo area·Full-time
Insurance sales applications for Zurich, Assurant, Mapfre, and Cardiff, and SIGEP WEB (Correios) integration.
12
C# · ASP.NET Web Forms · WCF · SQL Server · API Integration
Aug 2011— Apr 2013
Aug 2011 — Apr 2013
Sabesp
Tech Support Professional·Diadema·Internship
Active Directory, virtual machines, LDAP, and backup contingency, plus process system development.
1
Active Directory · Windows Server · LDAP · VMware · Networking
Jan 2011— Jun 2011
Jan 2011 — Jun 2011
Prepara Cursos Profissionalizantes
E-learning Support Assistant·São Bernardo do Campo, SP·On-site·Full-time
Technical and pedagogical support for online and hybrid students (Grupo MoveEdu).
1
E-learning · Technical support
Jun 2008— Dec 2010
Jun 2008 — Dec 2010
Governo do Estado de São Paulo
Digital Learning Assistant at the Acessa Escola Program·Diadema, SP·On-site·Part-time
Digital inclusion program in state schools.
1
E-learning · Digital inclusion

DepotUNIESP — Bachelor of Technology (BTech), System Analysis and Development, 2011 — 2013

Connections

Side Projects line · pinned on GitHub, refreshed at every build

Plat.	Destination	Language	Board	Stars
01	cpnucleo Hands-on .NET 10 project-management learning lab: compare REST/gRPC and EF Core/Dapper with Astro, PostgreSQL, OpenTelemetry, and executable contract tests.	C#	Source Live site Homepage	★ 9
02	super-mango-editor C11/raylib platformer and visual level editor. Play in the browser via WebAssembly, build TOML worlds, and learn game development with Sandbox School.	C	Source Live site	★ 1
03	solar-system-simulator Physics-first orbital mechanics lab in C11 and raylib: native and WebAssembly simulations, reproducible A/B experiments, and a source-backed small-body atlas.	C	Source Live site	★ 0
04	jonlib Jonlib: graphics and math libraries written in Bend 2, targeting raylib 6.2 parity.	Python	Source	★ 1
05	blazor-mudblazor-starter Local-first .NET 10 learning sandbox for Blazor Server and MudBlazor, with hands-on labs for state, forms, APIs, SQLite, authentication, localization, CSV, and Docker.	HTML	Source Live site Homepage	★ 2
06	speedy-bird-lynx Flappy Bird-inspired arcade game built with ReactLynx and TypeScript. Android host, Lynx web preview, playable Canvas demo, and Astro docs; iOS source scaffold included. Every pipe makes it faster.	TypeScript	Source Live site	★ 1

Later departures1 more public repository, most recently updated first

csharpc
A C# front-end for LLVM: compiles C# source to small, fast native executables via Roslyn + LLVM — like clang, rustc and gollvm. Written in C#.
C# · ★ 1

All repositories on GitHub →

Line Guide

Skills by line · a ring marks an interchange between lines

.NET Linebackend

.NET Core+
ASP.NET Core
Entity Framework
MAUI
Blazorchange for 8

Azure Linecloud / delivery

Azure
Azure DevOps
Docker
Kubernetes
CI/CD

Architecture Linearchitecture

CQRS
DDD
Microservices
Hexagonal
Clean Architecture
SAGA Pattern

Languages Linelanguages

C#
TypeScript
JavaScript
Rustexploring
Goexploring
Pythonexploring

Data Linedatabases

SQL Server
PostgreSQL

Frontend Linefrontend

Blazorchange for 2
React
Next.js
Angular

Service Notes

In effect on all lines

Advisory 1all lines

Reliability before theater

Prefer observable, recoverable systems over clever code that nobody wants to own at 2am.

In effect: nights and weekends, too.

Advisory 24

Boundaries with a reason

Use CQRS, DDD, microservices, and hexagonal architecture when they reduce real operational cost.

Patterns run only where they pay their fare.

Advisory 33

Delivery is part of design

CI/CD, small releases, and clear feedback loops keep architecture honest after the diagram is gone.

Frequent, small departures.

Customer Information

Contact

Now boarding

Open to remote roles and select backend architecture consulting — especially in FinTech and enterprise environments.

Backend architecture, .NET, C#, and Azure, for fintech and beyond. Working remotely with US-based companies from Brazil for the past 5+ years, based in Itanhaém on the São Paulo coast.

Based: Itanhaém, São Paulo, Brazil
Works: Remote, with US teams
Timetable: Resume·PDF

Station Index

Derivative Path

T-Systems do Brasil

KnowFully Learning Group

XP Inc.

T-Systems do Brasil

UnitedHealth Group

Leroy Merlin

Conecta Comercio e Serviços Ltda.

Sabesp

Prepara Cursos Profissionalizantes

Governo do Estado de São Paulo