Reliability before theater
Prefer observable, recoverable systems over clever code that nobody wants to own at 2am.
Open to remote roles + consulting
Jonathan Peris
Backend architecture / .NET / Azure
I build backend systems that can be understood, operated, and changed after they meet production traffic.
12+ yrsproduction software.NET + Azureprimary laneRemoteBrazil to US teamsSystemsarchitecture + delivery
deploy-ledger.yamlhealthy
operator: Jonathan Peris location: Itanhaém, São Paulo, Brazil status: Open to remote roles and select backend architecture consulting. focus: - backend architecture - delivery discipline - reliable systems runtime: years: 12+ stack: C# / .NET / Azure / SQL mode: remote-first
trace 01
Profile packet
My best work sits between architecture and execution: defining boundaries, shipping with tests, and keeping systems legible for the next engineer who has to debug them.
The record spans financial platforms, automotive operations, education, healthcare, retail, insurance, and infrastructure work. The common thread is boring reliability, clean ownership, and enough curiosity to keep improving the runtime.
Boundaries with a reason
Use CQRS, DDD, microservices, and hexagonal architecture when they reduce real operational cost.
Delivery is part of design
CI/CD, small releases, and clear feedback loops keep architecture honest after the diagram is gone.
trace 02
Capability map
/stack/backend
backend runtime
.NET Core+ASP.NET CoreEntity FrameworkMAUIBlazor
/stack/boundaries
architecture
CQRSDDDMicroservicesHexagonalClean ArchitectureSAGA Pattern
/stack/delivery
delivery
AzureAzure DevOpsDockerKubernetesCI/CD
/stack/data
data
SQL ServerPostgreSQL
/stack/languages
languages
C#RustGoPythonTypeScriptJavaScript
/stack/interface
interface
BlazorReactNext.jsAngular
trace 03
Experience trace
Software Engineer @ Derivative Path
New York, US · Remote
Software Engineer on the CAAR team, focused on developing and refining the General Ledger, Hedge Accounting, and Fiscal Calendar modules for the DerivativeEDGE platform. Enabling clients to achieve streamlined financial reporting, accurate hedge accounting, and efficient fiscal period management.
C#.NET 8SQL ServerCQRSAzure DevOpsClean Architecture
Principal .NET Developer @ T-Systems do Brasil
São Bernardo do Campo, BR · Remote
Spearheaded the critical platform and architecture migration of SGP Eletrônica — vital software for mapping and parameterization of Electronic Control Units (ECUs) within Mercedes-Benz trucks and buses. Ensured seamless transition while modernizing architecture and enhancing capabilities for advanced automotive diagnostics.
C#ASP.NET CoreBlazorEntity FrameworkAzureSQL Server
Software Engineer @ KnowFully Learning Group
Radnor, PA, US · Remote
Drove full-cycle development of the ExamReview platform — backend services, infrastructure, and mobile. Engineered the CMS delivering educational materials to thousands of students via LMS. Built the Admin platform for access control and hierarchy structuring. All platforms on Azure with Microservices, CQRS, and full test coverage.
C#AzureMicroservicesCQRSXamarinAzure DevOps
DevOps Engineer @ XP Inc.
Miami, FL, US · Remote
Ensured reliability of international wire transfers within XP Inc.'s international accounts group. Maintained and enhanced monitoring processes for Brazil-US fund transfers, managing Azure infrastructure and .NET Core microservices leveraging SAGA patterns and message queues for transactional consistency.
Azure.NET CoreDockerSAGA PatternRabbitMQCI/CD
Principal .NET Developer @ T-Systems do Brasil
São Bernardo do Campo, BR
Led design and development of key internal applications in Agile/Scrum. Engineered T-Atendo (helpdesk for Mercedes-Benz factory workers), Multi Manager (resource booking for on-site assets), and T-Entrego (corporate gift distribution platform). All built with .NET Core, Azure, and microservices.
C#.NET CoreAzureMicroservicesREST APIScrum
Senior .NET Developer @ T-Systems do Brasil
São Bernardo do Campo, BR
Built specialized applications for factory operations and corporate functions. Developed mileage control systems for Mercedes-Benz trucks and maintained institutional and intranet applications for internal communication and processes.
C#.NET FrameworkSQL ServerAzure DevOpsJavaScriptMVC
.NET Developer @ 5A Attiva / Amil (UnitedHealth Group)
São Paulo, BR
Developed hospital internal control applications and proof of concept projects. 5A Attiva maintains all internal Amil clinical systems in hospitals and clinics across Brazil.
C#ASP.NET MVCSQL ServerEntity FrameworkHealthcare
.NET Developer @ Sonda IT / Leroy Merlin
São Paulo, BR
Developed the second version of the label generation system for all Leroy Merlin stores and expanded the business operations management system. SONDA is a leader in systems integration and IT services in Latin America.
C#ASP.NET MVCAngularWeb APISQL Server
.NET Developer @ Conecta Serviços
São Paulo, BR
Developed insurance sales applications for major insurers including Zurich, Assurant, Mapfre, and Cardiff. Built integration with SIGEP WEB (Post Office) for ticket issuance and object returns.
C#ASP.NET Web FormsWCFSQL ServerAPI Integration
Tech Support Professional @ Sabesp
São Paulo, BR
Technical support for the state water supply and sanitation company. Configured Active Directory, virtual machines, LDAP, and managed backup contingency. Participated in development of the company's process system.
Active DirectoryWindows ServerLDAPVMwareNetworking
trace 04
Workbench
system design
cpnucleo
Production-grade .NET 10 microservices reference architecture — Clean Architecture, CQRS, DDD, Docker, and full test coverage
runtime lab
super-mango-editor
Classic 2D side-scrolling platformer built with C and SDL2 — playable in the browser via WebAssembly
load path
rinha2-back-end-dotnet
High-performance backend for the Rinha de Backend challenge — built with ASP.NET 9, PostgreSQL, Nginx, Native AOT, and Docker
load path
rinha2-back-end-go
High-performance backend for the Rinha de Backend challenge — built with Go, PostgreSQL, Nginx, and Docker
system design
blazor-mudblazor-starter
Blazor Server starter template with MudBlazor Material Design components, .NET 9, Docker, and Azure deployment
public repository ledger
Other GitHub repos
Fetched at build time from GitHub, excluding pinned Workbench repos, this portfolio, profile metadata, collaborator repos, and forks. Pages links resolve from each repository's live GitHub Pages site.
Rinha de Backend 2026 YOLO-mode participant implementation
AssemblyGitHub Pages
Rinha de Backend 2026 .NET 10 NativeAOT implementation with raw HTTP/1, Unix sockets, and fine-bucket fraud scoring
Rinha de Backend 2026 C implementation with raw HTTP/1, Unix sockets, SCM_RIGHTS load balancing, and exact IVF fraud scoring
Standalone YOLO-mode load balancer for Rinha de Backend 2026
High-performance backend for the Rinha de Backend challenge — built with Rust, Actix-web, PostgreSQL, Nginx, and Docker
PLpgSQLGitHub Pages
Grafana k6 stress tests for the Rinha de Backend challenge — Dockerized with InfluxDB metrics export
JavaScriptGitHub Pages
High-performance backend for the Rinha de Backend challenge — built with Python, PostgreSQL, Nginx, and Docker
PLpgSQLGitHub Pages