A tenant-scoped API demo with server-derived identity, durable idempotency, ETags, transactional outbox handling, and a real Azure Service Bus adapter.
Explore sourceHi, I’m Armando.
Platforms with
a little spark.
A principal C# / .NET platform and full-stack engineer with 12+ years across healthcare, fintech, insurance, and ERP. I build secure, multi-tenant systems from API to interface.
Open to international remote opportunities
Practical builder.
12+years making
complex things work
complex things work
C# / .NET✳React, Angular & Blazor✳GraphQL & data✳Azure, AWS & Docker✳Systems that work
01 / The work
Less talk.
More making.
Three runnable portfolio demonstrations, two earlier personal projects, and eight merged open-source contributions. A closer look at the engineering behind the work.
Pick a project. Explore how it works.
A server-rendered Blazor web demo where hard release gates and revision-controlled durable state make readiness explainable.
Explore sourceA Flutter companion with ten passing tests, a typed C# API client, safe request retries, and clear feedback when work changes elsewhere.
Try the live demo View sourceA .NET sample connecting container builds, Kubernetes configuration, and behavior-driven tests.
Source codePreserving mount order during Swarm force updates, so unchanged configuration stays unchanged.
Merged pull requestA shared settlement decision for Horizon verification and payment reconciliation in StellarGate.
Merged pull requestA practical workflow for finding an author’s changed files and collecting the context needed for review.
Read the guideMore work. Same care for the details.
Six more merged contributions, from asynchronous edge cases to public APIs.
One toolchain, fewer surprises
A consistent package-manager workflow across local setup, CI, and Docker.
View merged contribution ↗A cache that knows its limits
Keeping cache bounds intact when an asynchronous refresh reinserts an evicted entry.
View merged contribution ↗No proof left stranded
Moving inconclusive proofs into the existing admin-review flow when no validators are available.
View merged contribution ↗Getting the backend moving again
Removing a duplicate authentication import that prevented payment routes from parsing.
View merged contribution ↗A more predictable CI pipeline
Pinning remote GitHub Actions to verified commit SHAs while preserving existing workflow behavior.
View merged contribution ↗Making coverage visible
A public API for assessed-but-not-scored protocols, separate from the live leaderboard.
View merged contribution ↗The visuals explain the code. Personal projects and contributions are labeled separately; full details and attribution are in each case study.
02 / Enterprise experience
Built for the
real world.
12+ years across clinical systems, financial transactions, insurance operations, and enterprise back offices.
The responsibilities. The decisions. The results.
01 / HEALTHCAREMAR 2024 — SEP 2026
Behavioral-health EHR
& practice management
Zoobook Systems LLC
Principal C# / .NET Full-Stack Engineer
United States · Remote · Contract completed after successful launch
Architected multi-tenant clinical documentation, scheduling, provider, billing, claims, and reporting capabilities for a behavioral-health SaaS platform.
- ~30%
- faster selected API and data-access workflows
- ~40%
- less manual release activity through delivery automation
What I delivered
- Modernized legacy .NET services through .NET 8 and later .NET 10, improving async, EF Core, LINQ, SQL, and caching paths.
- Built REST and GraphQL layers with schemas, resolvers, filtering, pagination, validation, and authorization for clinical and administrative workflows.
- Engineered React/TypeScript and Blazor interfaces, plus .NET MAUI mobile workflows with secure API access, offline-aware handling, validation, and shared domain logic.
- Implemented AWS delivery, security, and observability patterns using ECS/Fargate, RDS, S3, CloudWatch, IAM, Secrets Manager, Docker, xUnit, and Moq.
C# · .NET 8/10 · ASP.NET Core · REST / GraphQL · React · Blazor · .NET MAUI · EF Core · SQL Server / MySQL · AWS
02 / PAYMENTSJAN 2021 — DEC 2023
Payment services
& microservices
Zūm Rails
Senior .NET Full-Stack Engineer
Montréal, Canada · Remote
Architected payment services for initiation, U.S. ACH and Canadian EFT processing, transaction status, settlement, reconciliation, refunds, and account workflows.
- ~25%
- improvement in selected response times through async processing, query tuning, fewer requests, and targeted caching
What I delivered
- Built Angular/TypeScript operations experiences backed by ASP.NET Core REST APIs for search, account management, reconciliation, refunds, and reporting.
- Designed idempotent processing, retries, validation, and webhook/event handling to protect financial workflows from duplicate transactions and transient failures.
- Implemented Azure App Service, Functions, Service Bus, Blob Storage, Key Vault, and Azure SQL patterns with repeatable Azure DevOps build, test, and deployment pipelines.
- Strengthened logging and automated test coverage while optimizing transaction-heavy APIs and screens.
C# · .NET Core · ASP.NET Core · Angular · TypeScript · Azure · REST APIs · Microservices · SQL
03 / INSURANCEJUN 2016 — DEC 2020
Policy administration
& claims workflows
i4Pro
Staff C# Backend Engineer
Promoted from C# / .NET Full-Stack Engineer · São Paulo, Brazil
Owned technical design for policy and claims capabilities covering quotations, issuance, endorsements, registration, customer records, financial workflows, and reporting.
- ~25%
- less manual handling time in selected claims workflows
- ~35%
- less processing time for selected operational reports
What I delivered
- Mentored engineers through architecture discussions, code and design reviews, and root-cause debugging of complex production issues.
- Automated validation and routing steps across claims workflows and standardized reusable domain and data-access components.
- Unified Angular/TypeScript workflows with C# Web API services and supported Xamarin.Forms mobile capabilities for field and claims work.
- Tuned SQL Server procedures, indexes, and reporting queries while strengthening access control, auditability, and REST integrations.
C# · .NET Framework / Core · ASP.NET MVC / Web API · Angular · Xamarin.Forms · Entity Framework · SQL Server
04 / ENTERPRISE ERPJAN 2014 — MAY 2016
Enterprise management
& back-office systems
TOTVS
Software Engineer — Enterprise .NET / ERP
Belo Horizonte, Brazil
Built and maintained financial, accounting, administrative, and operational capabilities across the TOTVS RM product ecosystem.
- ~20%
- faster selected search, reporting, validation, and export operations through SQL optimization
What I delivered
- Refactored reusable business and data-access components in C#, Entity Framework, and SQL Server.
- Optimized SQL queries and stored procedures for data-intensive operations.
- Integrated REST/SOAP services and browser-based JavaScript/jQuery features with server-side .NET modules.
- Supported production releases, root-cause analysis, and incremental refactoring of legacy components.
C# · .NET Framework · ASP.NET · Entity Framework · SQL Server · JavaScript / jQuery · REST / SOAP
Selected outcomes are from my professional résumé and apply to the workflows described. Employer systems are separate from the public repositories and open-source contributions above.
03 / The person behind the code
I like the
tricky bits.
Armando Francisco Denardi
Brazil · Working across borders
The API that’s slow. The workflow that’s tangled. The integration that almost works.
I’m a principal C#/.NET platform and full-stack engineer with 12+ years across healthcare, fintech, insurance, and ERP. I connect backend systems, data, cloud delivery, and the interfaces people use every day.
My approach is practical: understand the workflow, trace the problem, and leave the system easier to use and maintain - whether that means a GraphQL resolver, a Blazor screen, a .NET MAUI client, or a durable event path.
C# & ASP.NET CoreReact, Angular & BlazorGraphQL & REST APIsAzure & AWS.NET MAUI & XamarinReliable delivery
Want the full background? Download my résumé (PDF)A foundation in computer science
Faculdade de Computação e Informática da FAAP (FCI-FAAP)
Master’s Degree, 2012–2014 · Bachelor’s Degree, 2009–2012
04 / Something in mind?
Let’s build
something good.
Open to international remote opportunities
in .NET and full-stack engineering.